HomeMy WebLinkAboutPermit File BLD-2019-0833 1211 10th Street (4) 1y0p El@
.r � ._
I Storm Water Drainage Report
JAN 2 1 2020 inimum Requirements 1 through 5
ENGINEERING DEPARTMENT
� ITV(OF IWOORi'ES 904 6th Street Anacortes, WA 98221
O g / www.anacorteswa.gov
Official Use Only: (Information to Inspectors)
Required Storm Water Facility and other related requirements:
- 114mPTS.1% -Al6T Gct...stZvcr11 otLS t.t 2fa7
BmP 'M•I oG— nTo12rc' SW(3 Cot.11.12'lav
Project Address: _1211 10th Street Submittal Date: CI.21.2437.
Parcel Number: _P55411 Revision Number: Z
Permit Number: _BLD-2019-0833 Reviewer: n[-L.+t. L.atiGi
Acceptance Date (COA : .22.20
FRONT OF REPORT: L ,
Submittal Checklist: (All items listed below are required for a complete submitta
o Cover Sheet (Preparer to Provide): Project title, Location, Revision dates, Engineer's Stamp
o TAB 1: Minimum Requirement#1 — Preparation of Stormwater Site Plans
o TAB 2: Minimum Requirement#2— Construction Stormwater Pollution Prevention (SWPP)
o TAB 3: Minimum Requirement#3—Source Control of Pollution
o TAB 4: Minimum Requirement#4— Preservation of Natural Drainage Systems and Outfalls
o TAB 5: Minimum Requirement#5—On-site Stormwater Managements
o APPENDIX 1 - Survey performed by a Professional Land Surveyor
o APPENDIX 2 - Soils Analysis (Volume 1, Chapter 3.1.1) FLOW CONTROL EXEMPT
o APPENDIX 3 - Model Soil Management Plan for BMP T5.13
o APPENDIX 4 - Determining Construction Site Sediment Damage Potential (Appendix 7)
o APPENDIX 5 - Site Plan with all applicable information (Minimum Size 11x17—30 scale)
o APPENDIX 6 - Documented Site Photos (North, South, East and West)
o APPENDIX 7 - Drainage BMP Facility Maintenance Covenant, if applicable. To be recorded prior to the
Temporary Certificate of Occupancy, Certificate of Occupancy or Final Acceptance. FLOW CONTROL
EXEMPT
Stormwater Management Requirements:
o Refer to the 2012\14 Department of Ecology Manual, as amended in 2014 for further required
information.
o See also, City of Anacortes Municipal Code 19.76 for additional information
o See also, current Engineering Development Standards, Chapter 2- Storm Drainage for additional
information.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
- 00th �� 3' PIPE EROSION CONTROL NOTES A
J �L THROUGH' PIP A. A CERTIFIED EROSION AND SEDIMENTATION CONTROL SUPERVISOR <ESC) IS REQUIRED,
THE ESC SUPERVISOR MUST HAVE ATTENDED A CERTIFIED EROSION AND SEDIMENTATION
CURB CONTROL CALSS WITHIN 3-YEARS FROM TODAY'S DATE. MUST PROVIDE CERTIFICATION Jw
CITY STND P,
BMP C105 OR C107 bETAIL ST-03 INLET PROTECTION B. THE CERTIFIED EROSION AHD SEDIMENTATION CONTROL SUPERVISOR WILL OVERSEE AND
BMP C220 BE RESPONSIBLE FOR ALL EROSION CONTROL. THE FACILITIES SHALL DE INSPECTED DAILY
CONSTRUCTION I�tdov c�N` >c VSDOT DETAIL I-40-20.00 AND MAINTAINED TO ENSURE PROPER FUNCTIONING. WRITTEN RECORDS SHALL BE KEPT
N CB AT KINGSWAY OF WEEKLY REVIEWS AND AFTER EVERY SIGNIFICANT STORM EVENT OF THE ESC FACILITIES
ENTRANCE .ice-1� � DURING THE WET SEASON (OCTOBER 1 TO APRIL 30), MONTHLY REVIEWS DURING THE
.�q ) � r DRY SEASON (MAY 1 TO SEPTEMBER 30). WRITTEN RECORDS SHALL BE TURNED INT❑ THE
L c" ,� IL�lit FACE El CURB PROJECT MANAGER OR INSPECTOR ON A WEEKLY BASIS AT THE WEEKLY SCHEDULED
PROJECT MEETINGS. CO
BMP C154
CONCRETE WASHOUT o dr ve ay d •p C. EROSION CONTROL MEASURES SHALL BE IN PLACE PER THE APPROVED SET OF PLANS
TUB NO DIRECT •ater meter o PRIOR TO ANY CONSTRUCTION START.
DISCHARGE TO EXISTING •
\ ^^A D. THE EROSION CONTROL SHALL BE INSPECTED ONCE A DAY AND MODIFIED TO MEET THE —
SOILS \ \-, SURROUNDING CONDITIONS AS NEEDED. L d
aD
E. PROVIDE A SIGN DISPLAYING A 24-HOUR CONTACT NUMBER AND NAME OF THE ESC cc
•
EX SIDEW L!< SUPERVISOR. THE LETTER SIZE SHALL BE A MINIMUM OF 2-INCH LETTERS, THIS SHALL BE + I
...,�,
-
1 A IN PLACE PRIOR TO CONSTRUCTION START. REMEMBER, THE LOOK OF THE SIGN WILL BE A
cri 0,
BMP C233 REFLECTION OF THE CONTRACTOR, DEVELOPER AND DEVELOPMENT.
SILT FENCE N 89a 43r7 W •- oroO/r �M C233 _ `- Pri� F. THE STORM DRAIN SYSTEM AND EXISTING DITCHES SHALL BE CLEANED DAILY (SECTION 7-
U.. SILT FENCE ''� 0 �.� 07,3). ALL DRAINAGE SYSTEMS SHALL BE CLEANED TO THE ACCEPTANCE OF THE CITY OF ' o
j .�w�� ����� , ANACORTES PRIOR TO THE ACCEPTANCE OF THE PROJECT,
/: � e', ''' 411 • ..r.• •.• (.
' % �- BURLI all''f�e &VAC - G. STABILIZED CONSTRUCTION ENTRANCES AND ROADS SHALL BE INSTALLED AT THE BEGINNING PA O
= _ BMP T5,10C 4" BURLINGTON CB
` ' arkln ( OF CONSTRUCTION AND MAINTAINED DURING THE DURATION OF THE PROJECT. ADDITIONAL C\2
BMP C123 p., -;:. -.<- PERFORATED STUB OUT - l - �7 MEASURES MAY BE REQUIRED SUCH AS WASH PADS TO ENSURE THAT ALL PAVED AREAS ARE w
TEMP, SOIL STOCKPILE I. \ �j \\\ D ' � KEPT CLEAN. NO MUD IS ALLOWED TO ENTER ONTO CITY STREETS, Cq
1'•`. i ! CONNECTION 10 FEET IN
COVERING WITH ; '\?•_ j,o9 . X � �' �C
LENGTH SEE DETAIL.
STRAW DR VISQUEEN .. t \ H. ANY SOILS EXPOSED THAT WILL NOT BE DISTURBED FOR TWO (2) DAYS DURING THE WET
Nl;;" SEASON OR SEVEN (7) DAYS 1N THE DRY SEASON SHALL BE IMMEDIATELY STABILIZED WITH W
& SILT FENCE AROUND ; / I -_ x ,X` APPROVED ESC METHODS (SEEDING, MULCHING, PLASTIC COVERING, ETC.) 'y = .-
FENCE
SIDES, /% //I I. TWO (2) WEEKS PRIOR TO THE BEGINNING OF THE WET SEASON (OCTOBER l), ALL DISTURBED P_ Chi) w
I- AREAS SHALL BE REVIEWED TO IDENTIFY 1J[THCH ONES CAN BE SEEDED IN PREPARATION FOR ���j x
r /fir; - _ GAS G THE WINTER RAINS. DISTURBED AREAS SHALL BE SEEDED WITHIN ONE (1) WEEK OF THE '`v4
1 / -"ON-- BEGINNING OF THE WET SEASON. A SKETCH MAP OF THOSE AREAS TO BE SEEDED AND THOSE MZ O
\t.� BMP C240 AREAS TO REMAIN UNCOVERED SHALL BE SUBMITTED TO THE PROJECT MANAGER. THE PROJECT ~ U
;1.. . `SF.°� D TEMP SEDIMENT UNDERGROUND MANAGER CAN REQUIRE ADDITIONAL AREAS IN ORDER TO PROTECT SURFACE WATERS, ADJACENT '. 1 G0,2 d
1 IF CONDITION UGP PROPERTIES OR DRAINAGE FACILITIES. �1 c,D Z
a; xisting`Residence REQUIRE POWER J. PENALTIES FOR AN EROSIO.i CONTROL VIOLATION ARE SUBJECT TO A $300 TO $1,000 FINE
TRAP 8'X8' UNDER CHAPTER 17.66 - PENALTIES FOR VIOLATION (AMC). EACH DAY IS CONSIDERED
BMP C103 SEE DETAIL SANITARY A DIFFERENT VIOLATION,
FHIGH ENCE AS
BILITY °� front to remain Addition !
sz REMOVE ALL TEMPORARY EROSION CONTROL MEASURE WHEN THE SITE IS LANDSCAPED AND SOILS ARE
00 SEWER STABILIZED,
REQUIRED IF NO 1791 SF 1 , ALL DEWATERING SHALL DISCHARGE INTO A SEOIANT TRAP OR SEDIMENT POND,
FENCE EXIST. C0 /l STORM
O X - so THE CONTRACTOR IS TO PROVIDE TO THE CITY INSPECTOR THEIR SPILL PREVENTION PROGRAM TO BE INPLACE
o �;- I SEWER
DURING CONSTRUCTION.
n
Co�ered Porch j ! WATER t.,
�; ! i 1„xN) BMP T5,13 POST-CONSTRUCTION SOIL MAINfEi
IIP'' ' <PI : _i j,_ O O QUALITY AND DEPTH ON ALL
DISTURBED SOILS Catch Basin I I
,
BMP T5,13 :: `;� Sanitary Sewer Clean Out
POST-CONSTRUCTION SOIL Z CURB GUTTER AND SIDEWALK WORKMANSHIP AND AESTHETICS c.>
_ : ; Water Meter ® / 06 °'
QUALITY AND DEPTH ON D5 r ;
ALL DISTURBED SOILS • • f 1. CURB/GUTTER AND SIDEWALK CONSTRUCTION SHALL FOLLOW A TRUE AND UNIFORM CD �"' co
_ // HORIZONTAL AND VERTICAL ALIGNMENT. A .
. r'ccweretl car port A
• 2. THE VERTICAL AND HORIZONTAL SURFACE SHALL BE A SMOOTH BROOM FINISH WITH ° r 1 D,�
r NO DETECTABLE FINISHING BLEMISHES, UNDULATIONS, RIPPLES, SWELLS, WAVES, RUTS, Ci -'
II , it deck' �Nc •.492:?-S.F x
i t,, 1, 1 ,s TRAP CUTLET SECTION C-C FURROWS, GRAFFITI OR OTHER OBJECTIONABLE MARKS. THE END RESULT SHALL BE A I� a)
1 i i 1 I r- NEAT AND PROFESSIONALLY FINISHED APPEARANCE,
` i I . 'lilt 1 �.it . E Lc) :If
_ r _I 1 i t j_J'I I I�- 8 4 1 3. THE EDGE FINISH ADJACENT TO THE EXPANSION JOINT MATERIAL SHALL BE CLEAN AND 0 06
y _ �. -. r•. .'•; DS r
�5 1' CQ G\2 CID
•• r CVEeFLOW DISCHARGE TO STABILIZED FREE OF EXCESS SLURRY. THE EXPANSION JOINT MATERIAL SHALL BE TRIMMED TO A
SLOPE 2•-a ROCK RIPRAP CONVEYANCE TO DRIVEWAY
LEVEL EVEN WITH THE ADJACENT CONCRETE RESULTING IN A NEAT AND PROFESSIONALLY i
FINISHED APPEARANCE.
•
•
1 31 SIDE iQTTC1V ELEV. 3'1 SIDE :` t•'•"-.•
Fm
• Fi,°aOtTrst ��1, 3/4 iS� \ 6- 4. THE CITY ENGINEER IN HIS SOLE DISCRETION RESERVES THE AUTHORIY TO ORDER THE 0 -�,
•
GRAVEL I BMP C233 NAPPED RDC1( `C£OTExTILE REMOVAL OF SECTIONS OF CURB/GUTTER AND SIDEWALK THAT DO NOT MEET THE
•
SILT FENCE WORKMANSHIP AND AESTHETIC STANDARDS OF THE CITY OF ANACORTES,•
—4
• DRIVE �, TYPICAL TRAP CROSS SECTION B-B 5. SECITONS OF NEWLY CONSTRUCTED CURB GUTTER AND SIDEWALK THAT EXHIBIT 1 t
407•
S F'' SCALE 1 -5 CRACKING FOLLOWING THE CURING, SHALL BE SUBJECT TO REMOVAL AND REPLACEMENT. u 1
•• tel peal s' - CRACKING RESULTING FROM SUB-BASE FAILURE OR CONSTRUCTION SITE DAMAGE °
SHALL BE IMMEDIATELY REMOVED AND REPLACED TO THE NEAREST EXPANSION JOINT. W—
>�• - 1711N.DDEyPTH - MINOR HAIR LINE STRESS CRACKS MAY, AT THE DISCRETION OF THE PROJECT I `�
•
i • 22' - w n'! �spt I vi€ T,L��1F,-. SPILLWAY -1- I =IF' MANAGER, BE MONITORED AND RE-EVALUATED FOR POSSIBLE REMOVAL AT THE END OF
•C ± 2-4' NICK THE MAINTENANCE PERIOD.
MIN%4
GEBTEXTILE
� 2 s ._...� VASFfD RBI(
alley TRAP OUTLET SECTION C-C CONSTRUCTION SCHEDULE
SCALE: 1'=5'
- - — --- - 1. Install BMP C105 Construction Entrance, BHP C233 Silt Fence, BMP C103 High Visibility I--1
Construclton Fence and catch basin sock Inserts. 0
/�
d 2. Install BMP C154, Concrete Washout Basin,
` A 5
Ace ' (Nt..1..j fie Fe ft 4, '"�- 3. Install BMP C240, Sediment Trap as required.
`•\ ` 4. Excavation of foundation. .__:--)
LOT AREA = 6,000 SF 5. Install footings, foundation and utilities,
��j 1`� A•a 1e . l�.y�� t3t• B• 6. Backflil foundation and add additional BMP`s to minimize Sediment transfer and erosion. F
7. Install dispersion trench. Protect Infiltration trench from sediment until site is stabilized,
IMPERVIOUS AREAS 8, Construct home with gutters and connect to dispersion trench.
9. Connect to driveway as soon as concrete pavement is In place.
HOUSE ROOF 2,283 SF +l ,� ���� 10, Installation of BMP T5.13 Post Construclton Soils and landscaping.
PORCH AND RAMP 196 SF A �� 111���---------�d"1u�1� CONSTRUCTION STANDARDS
DRIVEWAY PARKNG 392 SF ^c�`-�� s ALL IMPROVEMENTS IN CITY RIGHT-OF-WAY SHALL BE CONSTRUCTED TO THE CURRENT WSDOT
GRAVEL PARKING 407 SF SPECIFICATION AND CURRENT CITY OF ANACORTES ENGINEERING STANDAR➢S,
TOTAL 3,278 SF ‹N 1 �� -e— ,� ° 0)
►t-An 41 56wee-- Ex * SOIL AMENDMENT NOTE w
o ti olo-2-p - ® ,- 1
GRAPHIC SCALE 1 ? bcterl 1-6. J Il�r OES.c`"- BMP Tall POST CONSTRUCTION SOIL QUALITY AND DEPTH. � -' r�i
SEE APPENDIX OF DRAINAGE REPORT FOR SPECIFICATION ON PROVIDING SOIL AMENDMENTS FOR ALL This plan sheet is accepted for constructor in accordance with the
10 0 5� �0 40 DISTURBED SOILS OUT SIDE DF IMPERVIOUS AREA AROUND BUILDING AND PAVED AREAS, 4_'I-IER,p City of Anocories ordinances and policies. Actual conformance of the SHBI F ND.
of was design with applicable laws is the sole responsib lily of the
( IN FEET ) .$,T h o professionalengineer,whose name and stampappear on this sheet. (V
^ r �r ' •9 Acquiring, with, and erm mitigation for all Federal, plJ
1 inch a 10 IL (� / u , /j i 1.
State, County, and Local haws, permits, and mandates, ncludng tut
1 1 '' not Wiled to the Endangered Species Act, Federal Wetland Permit,
L., 0 - 2.6 [ 1
- �. State Department of Fisheries Hydraulics Permit, Federal Flood PlainRSV"-
is-gpii op ``,. 27807 Permits, National Polulanl Discharge Elimination System Permits is
• •crsito 7, dOD N0: 2019-165
FS�ONAL fa�.. the responsibility of the Developer,Landowner, and that Engineer.
f The issuance of this permit shall not be construed as proof of DATE: Dec. 2019 i
compliance with opplcoble laws and permit requi ertxnts
_}. SCALE: Noted^� ;V) `` December 1I3, 2019 DRAWN: D. HERRiGSIAD
(r,• 1 CITY ENGINEER DATE CHECK: D. HERRIGSTAD
The acceptance will expire one year from the date
noted above.
RIM 1 OF 1
Project Description and Summary:
Summary Table
Existing Proposed
Development Type
Number of Lots 1
Lot Acreage in SF 6,000 SF
Soil Type(s) Catla Gravely Fine Sandy Loam
HG D
Site Sediment Transport Score (High\Low) Low 95 Low 95
Depth to Ground Water Table (Feet and Inches) N/A Flow Control Exempt
(See completed Soils Analysis (Volume 1, Chapter 3.1.1)
Infiltration Rate during Rainy Season (Inch\Per Hour) N/A Flow Control Exempt
Impervious Surface (on-site) 1,295 sf 3,278 sf
Impervious Surface (off-site) 0 200 sf
New and Replaced Hard Surface Total (SF) 0 3,582 sf
Lot Coverage (Percentage) 0 45%
BMP (Required Minimum Requirement 5) BMP T5.13 Post Construction Soils
13r A r io•c.. f =SW7 61v$.
Water Quality Method (Minimum Requirement 6) N/A
Water Quantity Method (Minimum Requirement 7) N/A
Existing Site Conditions Summary: P
(Additionally, provide information on previous permits, if any, like Grade and Fill, Clear and Grade, topography,
vegetation, drainage, Critical Areas adjacent to the site and how it may affect this project if soils are disturbed,
Soils Type (Included in Soils Analysis Report), Erosion Problem Areas, Construction Phasing\Sequence)
The existing 6,000 square foot site is has an existing 768 square foot home and 527 square foot
garage/shop. 10t" Street to the north is a paved road with curb and sidewalk and a 16' gravel alley to
the south. A gravel drive crosses the east side of the property. Otherwise the site is grass with two
trees along the east boundary. The site slope at 1 to 2% down to the northeast corner of the site. The
Anacortes Library lies across 10th Street to the North.
Developed Conditions Summary:
(Additionally, to be shown on the site plan. Identify cut and fill areas, proposed slopes of all hard
surfaces , proposed contours)
The project is to construct a single family home addition to the existing home. 527 square feet
of the existing house will be removed as well as the 527 square foot garage/shop. A carport
and gravel access will be provide to the alley. A concrete parking area will be provided at the
front of the property along 10t" Street. No additional fill is proposed for the site.
New roof area = 2,283 sf
New porch and ramp =196 sf
New concrete sidewalks and ramps = 392 sf
New gravel parking = 407 sf
Total new impervious area = 3,278 sf
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
•
Drainage (Basin (20 0 7 Storm Comp elan e City website\publicworks\engineering\comprehensive plans):
What Drainage Basin are you in? Fi Identify any downstream drainage issues (Storm Comp Plan: Yes. If so,
describe: i o issues are identified for baShi
Complete the ° pGplicabiiity ileclikrements — Row nut (Figure I-2.4.1 Attached, Figure 1-2.4.2 Attached
and Figure I-2.5.1 Attached)
Figure 1-2.4.1 Flow Chart for Determining Requirements for New
Development
Start Here -
Does the site have 35% Ves S;ee Redevelopment Minimum
or more of existing ► iR;ecuirernents and Flow Char-:
tmperiious coverage? =tgure i 4 2)
No
Does the project convert
acres or more of vegetation to
Does the project result in lawn or landscaped areas, or
5,000 square feet, or No convert 2.5 acres or more of
greater, of new plus V native vegetation to pasture?
replaced hard surface
area?
\NO
Yes
Yes
Does the project result in 2,000
square feet, or greater, of new plus
All Minimum Requirements replaced hard surface area?
apply to the new and replaced }
hard surfaces and converted No
vegetation areas. Yes/
Does the project have land
Minimum Requirements#1 disturbing activities of 7,000
through apply to the new 4 square Teeter greater?
and replaced hard surfaces `f
and the land disturbed. No
V
Minimum Requirement#2
applies.
lbal011 . Figure l-2^4. 1
- 111 Flow Chart for Determining Requirements for
"IOW' New Development
DEPARTMENT OF Revised June 2015
ECOLOGPlease see. littp://4..vvvvi.ecy.,,,,fa.gov/copyrightlytall for copyright notice. including permissions,
State of Washington limitation s,&liability, and disclaimer.
2014 Storrnwater Management Manual for Western Washington
Volume I - Chapter 2 - Page 37
Figure 1-2.4.2 Flow Chart for Determining Requirements for
Redevelopment
Does the project result in 2,000 square feet, or more, of new plus replaced hard surtace area?
OR
Does the land disturbing activity total 7 000 square feet or greater?
v Yes No
fU1inirnum Requirements #1 thiough #5
apply to the new and replaced hard Minimum Requirement#2 applies.
surfaces and the land disturbed
Next Question
Does the protect add 5 000 square feet or more of new hard surfaces
OR
Convert acres or more of vegetation to lawn or landscaped areas
OR
Convert 2 5 acres or more of native vegetation to pasture?
Yes No
V
All Minimum Requirements apply Next Question Is this a road
to the new hard surfaces and the related project? — No
converted vegetation areas.
Yes
Does the project add 5,000 square feet or more of new hard surfaces?
Yes
No .s the total of new plus replaced hard surfaces
Do the new hard v 5.000 square feet or more,
surfaces add 50% or No No additional No A n
more to the existing does the value of the proposed improvements
requirements.
hard surfaces within - including interior improvements - exceed
the project limits? 50% of the assessed value (or replacement
value) of the existing site Improvements?
Yeses 11 All Minimum Requirements apply to the new and replaced
hard surfaces and converted vegetation areas. 'Yes
1■6110111 Figure 1-2.4.2
Flow Chart for Determining Requirements for
IOW° . Redevelopment
DEPARTMENT OF Revised June 2015
ECOLOGY'
Please see http://www.ecy_wa.govicopyrightirtml for copyright notice including permissions,
State of Washington limitation of liability, and disclaimer.
2014 Stormwater Management Manual for Western Washington
Volume I - Chapter 2 - Page 38
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Figure 12 5 1 Flow Chart for Determining LID MR #5 Requirements
Does the project discharge to Flow Control Exempt Waters(per Minimum Requirement (MR1#70
Ves
REQUIRED Implement the fallowing BA4Ps No
*here feasible
• BMP T5.13 Post-Construction Soil Quality 1►' No(the
and Depth Does the project project
a BMP T5.10A, B, or C: Downspout Full trigger only MRs#1 - triggered
Infiltration, Downspout Dispersion #5?(Per Figure 3.2 or only MR#2)
Systems, or Perforated Stub-out Figure 3.3 in Appendix, Na additional
Connections 1 of the 2013-2018 requirements
• BMP T5.11 or T5.12: Concentrated Flow WtVA Phase II Permit
Dispersion or Sheet Flow Dispersion &Phase I Permit).
NOT REQUIRED:Achievement of the LID No(the project triggered
Performance Standard,Applying the other Yes only MRs#'1 -#9)
BMPs in List#1 or List#2.
Jproject inside the UGA?
Did the project developer choose to meet No
the LID Performance Standard? e
is the project on a parcel
v No of 5 acres or larger?
REQUIRED: For each Did the project developer No
es
surface, consider the choose to meet the LID �/Y
BMPs in the order • Performance Standard? REQUIRED:Meet the LID
listed in List#1 for that Performance Standard through
type of surface. Use Yes the use of my BMP(s)in the
the first BMP that is /EQUIRED:
N� 2014 SMIMVUW except for
considered feasible. Rain Gardens(the use of
Bioretention is acceptable).
NOT REQUIRED:
Achievement of the LIDIf the project can't meet the
Performance Standard. For each LID Perfoance Standard, it
7rface,consider the BMPs must seek and be granted an
REQUIRED: Meet the LID Performance in the order listed in List#2 exception/variance.
Standard through the use of any BMP(s)in for that type of surface_ Use
the 2014 SW 1MWAf except for Rain Gardens the first BMP that is REQUIRED: Apply PJMP T5.13
(the use of bioretenticn is acceptable). considered feasible. Post-Construction Soil Quality
and Depth.
REQUIRED for Projects Triggering MR#1-9`: NOT REQUIRED:
Apply BMP T5.13 Post Construction Soil Achievement of the LID NOT REQUIRED:Applying the
Quality and Depth. Performance Standard. BMPs in List#1 or List#2_
NOT REQUIRED:Applying the BMPs in List
41 or List#2.
*Recommended by Ecology for projects triggering MRs#1 -#5.
mii3113111 Figure 1-2 5.1
Flow Chart for Determining LID MR #5
' "Gli*di Requirements
DEPARTMENT OF
ECOLOGY Revised June 2015
I
Please see httpiA arw. cy.wa_govlcopyright.htmtfor copyright notice including permissions,
State of Washington limitation of liability, and disclaimer.
2014 Stoimwater Management Manual for Western Washington
Volume I - Chapter 2 - Page 60
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 1 (MINIMUM REQUIREMENT#1)
• 1-2.5.1 Minimum Requirement#1 — Prepare a Stormwater Site Plan
- 1.3— Preparation of a Stormwater Site Plan
- 1.3.1 — Stormwater Site Plans: Step-by-Step
Note: The level of detail needed for each step depends upon the project size. Provide a narrative
description of each step.
1-3.1.1 Step 1 - Site Analysis: Collect and Analyze Information on Existing Conditions
Site analysis shall be submitted as part of the Existing Conditions Summary above. Part of the
information in this step should be used to help prepare the Construction Stormwater Pollution
Prevention Plan. Purpose of the Site Analysis is to provide for a Low Impact Development site
design that is intended to compliment the predeveloped conditions of the site.
A Stormwater site plan has been prepared showing erosion control methods for this site.
The site slopes at 1 to 2%to the northeast corner of the site. The gravel alley borders the
uphill southern boundary of the site with single family homes to the east and west.
1-3.1.2 Step 2 - Prepare Preliminary Development Layout
Based upon the analysis of existing site conditions, locate the buildings, roads, parking lots,
landscaping features, on-site stormwater management BMP's, and preliminary location of
stormwater treatment and retention/detention facilities for the proposed development.
BMP's will include covering soil stock piles and protecting down slope properties with silt
fencing. The temporary construction entrance will be off 10th Street on the North side of
the property. Grading will take place across most of the entire site. Storm water
infiltration as described in Minimum requirement#5 will take place in the northeast corner
of the site.
1-3.1.3 Step 3 - Perform Off-site Analysis (at Local Agency's Option): Use additional Sheets, if
necessary,
Ecology recommends that local governments require an off-site analysis for projects that add
5,000 SF or more of new hard surfaces, or convert 3/4 acres of vegetation to lawn or landscape
areas, or convert 2.5 acres of forested area to pasture.
Off-site analysis extends to % mile downstream of the project site.
Storm water sheets to the north onto 10th Street and flows east
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Y
1-3.1.4 - Determine Applicable Minimum Requirements
Establish project size thresholds for the application of Minimum Requirements to new
development and redevelopment projects. Figures 2.4.1 (Attached) and 2.4.2 (Attached)
provide the same thresholds in a flow chart format. Based on the preliminary layout, determine
whether Minimum Requirements#1 through #5 apply to the project; or, whether Minimum
Requirements #1 through #9 apply.
Please note, that Minimum Requirement#1 through #5 may trigger additional Minimum
Requirements, such as Flow Control.
The total new impervious area added to this site will be 3,278 square feet and under the
5,000 square foot threshold and triggers minimum requirements 1 through 5.
1-3.1.5 Step 5 - Prepare a Permanent Stormwater Control Plan
(Refer to this section of the Ecology Manual for requirements.)
A storm water plan is provided in the developed site plan in Appendix 5. The drainage
system will be described in minimum requirement#5 below. The options for a perforated
stub out and sheet flow dispersion are discussed in Minimum Requirement#5 below.
1-3.1.6 Step 6 - Prepare a Construction Stormwater Pollution Prevention Plan (MR#2 — 13
Elements)
Refer to Chapter 11-3—Planning for a detailed description of each element. See also attached
Tables 4.1.1 (Source Control BMP's by SWPPP Element) and Table 4.2.1 (Runoff Conveyance
and Treatment BMP's by SWPPP Element).
See attached 13 Elements of a SWPPP, please complete and attached
1-3.1.7 Step 7 - Complete the stormwater site plan
The Stormwater Site Plan encompasses the entire submittal to the Local Agency with drainage
review authority. Refer to this section of the Manual for further clarification of each item and
what is required. See below:
• Project Overview
• Existing Conditions Summary
• Off-site Analysis Report
• Permanent Stormwater Control Plan
• Construction Stormwater Pollution Prevention Plan
• Special Reports and Studies
• Other Permits
• Operation and Maintenance Manual
• Declaration of Covenant for Privately Maintained Flow Control and Treatment Facilities.
(See attached Drainage BMP Maintenance Covenant BMP Agreement)
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
• Declaration of Covenant for Privately Maintained On-site Stormwater BMP's (See
attached Drainage BMP Maintenance Covenant BMP Agreement)
• Bond Quantities Worksheet, if applicable
The project overview has been provided at the beginning of this report along with an
existing conditions description. Maps are included in the attachments.
1-3.1.8 Step 8 - Check Compliance with all Applicable Minimum Requirements
A Stormwater Site Plan as designed and implemented should specifically fulfill all Minimum
Requirements applicable to the project. The Stormwater Site Plan should be reviewed to check
that these requirements are satisfied.
To take place during review and during and after construction.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 2 (MINIMUM REQUIREMENT#2)
• 1-2.5.2 Minimum Requirement#2— Construction Stormwater Pollution Prevention Plan (SWPP)
- All projects are required to complete Minimum Requirement 2.
- Refer to the 13 Elements of the SWPP (See document below, complete and attach)
- See attached Table 4.1.1, Table 4.2.1 and Table
- Provide Engineering Calculations as an attachment for Sediment Ponds\Traps, Diversions,
Waterways and Runoff/Stormwater Detention Calculations.
Table 4.1.1 Source Control BMP's by SWPPP Element
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Elemental Elemantti! Elementi5 Element SS Elementl9 Etemanlll anneal
EiamentH�
BLIP or Element Name Preserve Estabihh Stabilize Protect Cantrol LIal:ttain Manage the Protest Lour
Vegetatbeitiark Construction Sole Slopes Pella:ants B Eel Ps Protect Impact
Ciearinu Limns Access E evelooment
BMP C101: Presery Ing Natural Vegetation se
BHP C102:Buffer Zones i
-_J I I/ J
BLIP C103:High Wlbllty Plastk or Metal se
Fence
BMP 0105: StabllcedConstruction se
EntrancefE:dt ,
-
BMP C10fi:YYheel Wash I
BMP C1OT:Conetniction RoadfParkkig 1
Area Stabllydion
BMP C120:Tentpor ey and Permanent I ,f
Seeding
BMP C121:Mukhtig $ I
BMP NM Hets and Blankets / I
BMP C123: Plaits Covering '-'
BMP C124: Sodding ,e
BMP C129:TapsollingICampostkig ,c
BMP C125: Pslyserydenida for Soil Erasion
Protection
BMP C130: Surface Roughening I I
BMP C131:Gradient Terraces I I
BMP C140: Dust Control I
BMP C150: Materials On Hand I I
BMP C151:Concrete Handling I
BMP C1521 Saureutting and Surfacing ,VP
Polution Prevention
BMP C153: Material Delivery,Storage and
Cantdnment I -- f
BMP C154:Concrete%behout Area I
IMP C1SO:Certified Erosbn and V I
Sediment Control Loc 1
BMP C112:Schedule° I
Table 4.2.1 Runoff Conveyance and Treatment BMP's by SWPPP Element
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
I n
913rniMIE fa Eicrilc7 Floreill.N6 t FlemieritC Ele6P"'nL I Element#9 elenwit.46 Elerwill 11112-1'
lotiall ' . Rabilizo li - P r Out Lcw
PE=.1 piiP C.,7 Orapn ni[Nur& • Ccinirol Pi. tRI(4 1 Ph3tilir-t ' Contscl, Central De-
Szifirrfto fit __ Channialim - Impact:
rilf_reiRR-Iiim - - lops £-rin IllitelE ' - PAttlia-nts 112LN-tilt]
f:cm train `.and OUIS2IS linwulatainniE
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e
plUIP CM-tt LtrIci Crialthuls v ,
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-- —
-1M. ' e:',11 -3: Tei-zt_nr DrLT I; •V,-
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BRIIP C20'4: Pipe 51orfe IDTztin:F.:
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1241P C.206: a-nr.tr.-uslac.n Ittrairts - V
BMP C206: LkAtel. 5$-Jr&fiC1fif
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amp Call: chi-rli.I17.1-3-nr
ship ....-:,..108., 77brigislar Mit DIM friihRoxilte.
•:".' t•
LitzumEld Chenkaarrifj _ 7
BlifliF0 C209: auttlet Peantiktni I V'
BI'D-IP r220: Frio-rm broln Inlet Pro/Inflow L v7 ,
t
_1
PIM 'C231: Bilidn Battler -ti/
—
I
13MP t9,232; Oravill Filter Herrn ve
EINIP0233t _Sat FPn0.4 i.
P . Irs.
..,
BEV C2341 "Vegelwlerd:_itp
V
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aMP C2:16.: 14intiliiis ..--
'P.
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Brat' ,G2-3_04 VogRotivr..: Filtrution if"
arkilpid2-4(tc SDdnf Trail ,-,/' i
. T
BMP C241t Temparanik:Freelwout%lel If 1 ,
__ ___
BMP al& Dfig-Mblidititi StiYriffriatt :
re-
Choirle-all'inalineirt i _
i
BMPC2.51:Oa netrarAlott.5 t ofirt-thafto x I
Flitra_mlizin i •
/I __I
Drip C2,9 ilEgth Dr_TI Neuirrtlization Lf-Alruil I
Cu- ___
• i _ I
_ _ ._ . -., _ _____ 1
BUIP 0213:pH e toittrgi Ne High Fill ator I
I i I
i . I
13 Elements of SWPPL
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
(Construction Stormwater Pollution Prevention Plan)
Please check off boxes to show that each element has been read and understood. Provide details where
applicable and if certain aspects are unnecessary or exempt, clearly justify. Details of the 13 Elements and the
correlating BMPs are listed Above from the 2014 Stormwater Management Manual for Western Washington
(SWMMWW). A link is provided on the City of Anacortes website, under Planning, Community, & Economic
Development Department, as well as under Stormwater on the Engineering Division of Public Work's page.
Owner Name: Victor and Elizabeth Wikstrom
Site Address: 1211 10th Street
Prepared By: Dale Herrigstad PE
The Stormwater checklist or building permit determined that:
❑ The 13 elements must be addressed ❑ These elements must be addressed
for construction activity adding under for construction activity adding 2,000
2,000 sq. ft. of hard surface area. sq. ft. or more of hard surface area.
This means that an attached narrative
and site plan are required with this
document.
Under each element, provide the BMP's that will be applicable to your project. Use the attached Tables
provided.
ELEMENT 1: Preserve Vegetation/Mark Clearing Limits
• Before beginning land disturbing activities, including clearing and grading, clearly mark all clearing
limits, sensitive areas and their buffers, and trees that are to be preserved within the construction area.
• Retain the duff layer, native top soil, and natural vegetation in an undisturbed state to the maximum
degree practical.
A high visibility construction fence BMP C103 will be installed at the perimeter of the construction site
except if and existing fence already exists or were silt fence is used. BMP will be installed as first step
of construction.
BMP C233, Silt Fence will also be used to mark the north and east perimeter of the construction site.
BMP to be monitored daily and repaired as needed.
ELEMENT 2: Establish Construction Access
• Limit construction vehicle access and exit to one route, if possible.
• Stabilize access points with a pad of quarry spalls, crushed rock, or other equivalent BMPs, to minimize
tracking onto roads.
• Locate wheel wash or tire baths on site, if the stabilized construction entrance is not effective in
preventing tracking sediment onto roads.
• If sediment is tracked off site, clean the affected roadway thoroughly at the end of each day, or more
frequently as necessary(ex: wet weather). Remove sediment from roads by shoveling, sweeping, or
pick up and transport the sediment to a controlled sediment disposal area.
❑ Conduct street washing only after sediment is removed in accordance with the above bullet.
A Control street wash wastewater by pumping back on site or otherwise preventing it from discharging
into systems tributary to waters of the State.
The construction entrance will be limited to one location at 10th Street with BMP C105 or C107
(Construction Entrance.)
Any dirt or mud that is tracked onto the roadway will be clean immediately.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
To be installed prior to construction. BMP to be monitored daily and repaired as needed.
ELEMENT 3: Control Flow Rates
• Protect properties and waterways downstream of development sites from erosion and the associated
discharge of turbid waters due to increases in the velocity and peak volumetric flow rate of stormwater
runoff from the project site.
• Where necessary to comply with the bullet above, construct stormwater retention or detention facilities
as one of the first steps in grading. Assure that detention facilities function properly before constructing
site improvement (e.g. impervious surfaces).
A If permanent infiltration ponds are used for flow control during construction, protect these facilities from
siltation during the construction phase.
A silt fence BMP C233 is to be installed along the downhill south side of the property with the goal of
preserving some grass but the majority of the site will be disturbed.
ELEMENT 4: Install Sediment Controls
• Design, install, and maintain effective erosion controls and sediment controls to minimize the discharge
of pollutants.
• Construct sediment control BMPs (sediment ponds, traps, filters, etc.) as one of the first steps in
grading. These BMPs shall be functional before other land disturbing activities take place.
• Minimize sediment discharges from the site. The design, installation and maintenance of erosion and
sediment controls must address factors such as the amount, frequency, intensity and duration of
precipitation, the nature of resulting stormwater runoff, and soil characteristics, including the range of
soil particle sizes expected to be present on the site.
I Direct stormwater runoff from disturbed areas through a sediment pond or other appropriate sediment
removal BMP, before the runoff leaves a construction site or before discharge to an infiltration facility.
Runoff from fully stabilized areas may be discharged without a sediment removal BMP, but must meet
the flow control performance standard in Element#3, bullet#1.
• Locate BMPs intended to trap sediment on-site in a manner to avoid interference with the movement of
juvenile salmonids attempting to enter off-channel areas or drainages.
❑ Provide and maintain natural buffers around surface waters, direct stormwater to vegetated areas to
increase sediment removal, and maximize stormwater infiltration.
• Where feasible, design outlet structures that withdraw impounded stormwater from the surface to avoid
discharging sediment that is still suspended lower in the water column.
Per BMP C233 a silt fence will be installed as noted in element 3. To be installed prior to the start of
construction. BMP to be monitored daily and repaired as needed. BMP C162 Scheduling.
ELEMENT 5: Stabilize Soils
• Stabilize exposed and unworked soils by application of effective BMPs that prevent erosion. Applicable
BMPs include, but are not limited to: temporary and permanent seeding, sodding, mulching, plastic
covering, erosion control fabrics and matting, soil application of polyacrylamide (PAM), the early
application of gravel base early on areas to be paved, and dust control.
• Control stormwater volume and velocity within the site to minimize soil erosion.
• Control stormwater discharges, including both peak flow rates and total stormwater volume, to minimize
erosion at outlets and to minimize downstream channel and stream bank erosion.
• Soils must not remain exposed and unworked for more than the time periods set forth below to prevent
erosion.
o During the dry season (May 1 — Sept 30): 7 days
o During the wet season (Oct 1 —Apr 30): 2 days
• Stabilize soils at the end of the shift before a holiday or weekend if needed based on the weather
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
forecast.
• Stabilize soil stockpiles from erosion, protect with sediment trapping measures, and where possible, be
located away from storm drain inlets, waterways, and drainage channels.
• Minimize the amount of soil exposed during construction activity.
A Minimize the disturbance of steep slopes.
❑ Minimize soil compaction and, unless infeasible, preserve topsoil.
Stabilize exposed and unworked soils by application of effective BMPs that prevent erosion.
Applicable BMPs include, but are not limited to: temporary and permanent seeding, sodding, mulching
and plastic covering. Install plastic covering per BMP C123 on Soils Stockpiles. BMP to be monitored
daily and repaired as needed. Refer to Table 4.1.1 in MR#2.
ELEMENT 6: Protect Slopes
Design and construct cut-and-fill slopes in a manner to minimize erosion. Applicable practices include,
but are not limited to, reducing continuous length of slope with terracing and diversions, reducing slope
steepness, and roughening slope surfaces (Ex: track walking).
• Divert off-site stormwater(run-on) or ground water away from slopes and disturbed areas with
interceptor dikes, pipes, and/or swales. Off-site stormwater should be managed separately from
stormwater generated on the site.
❑ At the top of slopes, collect drainage in pipe slop drains or protected channels to prevent erosion.
o *Temporary pipe slope drains must handle the peak volumetric flow rate calculated using a 10-
minute time step from a Type 1A, 10-year, 24-hour frequency storm for the developed condition.
Alternatively, the 10-year, 1-hour flow rate predicted/indicated by an approved continuous runoff
model, increased by a factor of 1.6, may be used. The hydrologic analysis must use the existing
land cover condition for predicting flow rates from tributary areas outside the project limits. For
tributary areas on the project site, the analysis must use the temporary or permanent project
land cover condition, whichever will produce the highest flow rates. If using the Western
Washington Hydrology Model (WWHM)to predict flows, bare soil areas should be modeled as
"landscaped" area.
o Where 15-minute time steps are available in an approved continuous runoff model, they may be
used directly without a correction factor.
• Place excavated material on the uphill side of trenches, consistent with safety and space
considerations.
❑ Place check dams at regular intervals within constructed channels that are cut down a slope.
A Consider soil types and its potential for erosion.
A Stabilize soils on slopes, as specified in Element 5.
A BMP combinations are the most effective method of protecting slopes with disturbed soils. Ex: Use both
mulching and straw erosion control blankets.
The site is flat with a 1 to 2% slope and slope protection will not be an issue.
ELEMENT 7: Protect Drain Inlets
71 Protect all storm drain inlets made operable during construction so that stormwater runoff does not
enter the conveyance system without first being filtered or treated to remove sediment.
Clean or remove and replace inlet protection devices when sediment has filled one-third of the available
storage (unless a different standard is specified by the product manufacturer).
7 Where possible, protect all existing storm drain inlets so that stormwater runoff does not enter the
conveyance system without first being filtered or treated to remove sediment.
Keep all approach roads clean. Do not allow sediment and street wash water to enter storm drains
without prior and adequate treatment unless treatment is provided before the storm drain discharges to
waters of the State.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
• Inlets should be inspected weekly at a minimum and daily during storm events.
Per detail 1-40.20-00 Storm Drain Inlet protection devices will be installed at existing catch basins in the
immediate vicinity of the project.
To be installed prior to the start of any construction. Nearest CB is just east of the site at the corner of
10th and N Avenue.
BMP to be monitored daily and repaired as needed.
ELEMENT 8: Stabilize Channels and Outlets
• Design, construct, and stabilize all on-site conveyance channels to prevent erosion from the following
expected peak flows:
*Channels must handle same peak volumetric flow rate as temporary pipe slope drains listed in
Element 6, above.
• Provide stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent
streambanks, slopes, and downstream reaches at the outlets of all conveyance systems.
• The best method for stabilizing channels is to completely line the channel with a blanket product first,
then add check dams as necessary to function as an anchor and to slow the flow of water.
No stormwater runoff will be conveyed off site via channels, swales, or streams.
ELEMENT 9: Control Pollutants
A Design, install, implement, and maintain effective pollution prevention measures to minimize the
discharge of pollutants.
• Handle and dispose of all pollutants, including waste materials and demolition debris that occur on-site
in a manner that does not cause contamination of stormwater.
• Provide cover, containment, and protection from vandalism for all chemicals, liquid products, petroleum
products, and other materials that have the potential to pose a threat to human health or the
environment. On-site fueling tanks must include secondary containment. Secondary containment
means placing tanks or containers within an impervious structure capable of containing 110% of the
volume contained in the largest tank within the containment structure. Double-walled tanks do not
require additional secondary containment.
• Conduct maintenance, fueling, and repair of heavy equipment and vehicles using spill prevention and
control measures. Clean contaminated surfaces immediately following any spill incident.
• Discharge wheel wash or tire bath wastewater to a separate on-site treatment system that prevents
discharge to surface water, such as closed-loop recirculation or upland land application, or to the
sanitary sewer, with local sewer district approval. Wheel wash or tire bath wastewater should not
include wastewater from concrete washout areas.
❑ Apply fertilizers and pesticides in a manner and at application rates that will not result in loss of
chemical to stormwater runoff. Follow manufacturers' label requirements for application rates and
procedures.
• Use BMPs to prevent contamination of stormwater runoff by pH-modifying sources. The sources for this
contamination include, but are not limited to: bulk cement, cement kiln dust, fly ash, new concrete
washing and curing waters, waste streams generated from concrete grinding and sawing, exposed
aggregate processes, dewatering concrete vaults, concrete pumping, and mixer washout waters. Adjust
the pH of stormwater if necessary to prevent violations of the water quality standards.
• Assure that washout of concrete trucks is performed off-site or in designated concrete washout areas
only. Do not wash out concrete trucks onto the ground, or into storm drains, open ditches, streets, or
streams. Do not dump excess concrete on site, except in designated concrete washout areas. Concrete
spillage or concrete discharge to surface waters of the State is prohibited. Do not use upland land
applications for discharging wastewater from concrete washout areas.
• Obtain written approval from Ecology and provide to the City before using chemical treatment other
than CO2 or dry ice to adjust pH.
• Woody debris may be chopped and spread on site.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
• Conduct oil changes, hydraulic system drain down, solvent and de-greasing cleaning operations, fuel
tank drain down and removal, and other activities which may result in discharge or spillage of pollutants
to the ground or into stormwater runoff using spill prevention measures, such as drip pans.
• Clean contaminated surfaces immediately following any discharge or spill incident. Emergency repairs
may be performed on-site using temporary plastic placed beneath and, if raining, over the vehicle.
Per BMP C154 a Concrete Washout Area is to be installed onsite to capture contaminated water from
concrete washouts. To be installed prior to foundation /concrete installation.
BMP to be monitored daily and repaired as needed.
Contractor is to provide spill prevention kits for excavation and concrete crews are required on Site.
ELEMENT 10: Control De-Watering
• Discharge foundation, vault, and trench dewatering water, which have characteristics similar to
stormwater runoff at the site, into a controlled conveyance system before discharge to a sediment trap
or sediment pond.
• Discharge clean, non-turbid de-watering water, such as well-point ground water, to systems tributary to,
or directly into surface waters of the State, as specified in Element 8, provided the de-watering flow
does not cause erosion or flooding of receiving waters or interfere with the operation of the system. Do
not route clean dewatering water through stormwater sediment ponds. Note that "surface waters of the
State" may exist on a construction site as well as off site; for example, a creek running through a site.
• Handle highly turbid or contaminated dewatering water separately from stormwater.
• Other treatment or disposal options may include:
1. Infiltration
2. Transport off-site in a vehicle, such as a vacuum flush truck, for legal disposal in a manner that
does not pollute state waters.
3. Ecology-approved on-site chemical treatment or other suitable treatment technologies.
4. Sanitary or combined sewer discharge with local sewer district approval, if there is no other
option.
5. Use of a sedimentation bag with outfall to a ditch or swale for small volumes of localized
dewatering.
• Construction equipment operation, clamshell digging, concrete tremie pour, or work inside a cofferdam
can create highly turbid or contaminated dewatering water.
Discharging sediment-laden (muddy)water into waters of the State likely constitutes a violation of water
quality standards for turbidity. The easiest way to avoid discharging muddy water is through infiltration
and preserving vegetation.
If dewatering is needed all discharge will be directed to a temp. sed. trap BMP C240 prior to discharge
to the city storm drainage system. The sediment trap will be designed for a typical 4,600 sf impervious
area or 0.11 acres where the developed 2 year flow is 0.03 cfs X 2080 sf/cfc flow= 62 sf surface area
plan or 8'x8' square surface pond area minimum.
ELEMENT 11: Maintain BMPs
• Maintain and repair all temporary and permanent erosion and sediment control BMPs as needed to
assure continued performance of their intended function in accordance with BMP specifications.
I Remove all temporary erosion and sediment control BMPs within 30 days after achieving final site
stabilization or after the temporary BMPs are no longer needed. Some temporary erosion and sediment
control BMPs are bio-degradable and designed to remain in place following construction such as
compost socks.
• Provide protection to all BMPs installed for the permanent control of stormwater from sediment and
compaction. All BMPs that are to remain in place following completion of construction shall be
examined and placed in full operating conditions. If sediment enters the BMPs during construction, it
shall be removed and the facility shall be returned to the conditions specified in the construction
documents.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
• Remove or stabilize trapped sediment on site. Permanently stabilize disturbed soil resulting from
removal of BMPs or vegetation.
BMP to be monitored daily and repaired as needed and or as required by the City of Anacortes.
Weekly reports are required to be submitted to the building department.
ELEMENT 12: Manage the Project— Projects subject to Minimum Requirements 1-9 must have a Certified
Erosion and Sediment Control Lead (CESCL) for site inspections. Projects subject to Minimum Requirements
1-5 do not require the inspector to be certified. By the initiation of construction, the SWPPP must identify the
CESCL or inspector, who shall be present on-site or on-call at all times.
• Phase development projects to the maximum degree practicable and take into account seasonal work
limits to prevent soil erosion and prevent transporting sediment from the site during construction.
• Inspection and monitoring — Inspect, maintain, and repair all BMPs as needed to assure continued
performance of their intended function.
• Maintain, update, and implement the SWPPP.
• Clearing and grading activities for developments shall be permitted only if conducted using an approved
site development plan (e.g., subdivision approval).
• From Oct 1 through Apr 30, clearing, grading, and other soil disturbing activities is permitted only if
shown that the site operator will prevent silt-laden runoff from leaving the site through a combination of
the following:
1. Site conditions including existing vegetative coverage, slope, soil type, and proximity to
receiving waters.
2. Limit activities and the extent of disturbed areas.
3. Proposed erosion and sediment control measures.
Weather conditions can influence the seasonal limitation on site disturbance. The City of Anacortes has
the authority to take enforcement action per AMC 19.76 Stormwater.
• The following activities are exempt from the seasonal clearing and grading limitations:
1. Routine maintenance and necessary repair of erosion and sediment control BMPs;
2. Routine maintenance of public facilities or existing utility structures that do not expose the soil or
result in the removal of the vegetative cover to soil
3. Activities where there is 100% infiltration of surface water runoff within the site in approved and
installed erosion and sediment control facilities.
BMP to be monitored daily and repaired as needed and the responsibility of the owner. Project does
not requires a certified CESCL.
ELEMENT 13: Protect Low Impact Development BMPS
• If implementing any bioretention facilities or rain gardens, refer to the applicable BMP sections of the
Manual for requirements.
No LID BMPS are proposed.
Applicant Signature Date
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 3 (MINIMUM REQUIREMENT#3)
• 1-2.5.3 Minimum Requirement#3 —Source Control of Pollution
All known, available and reasonable source control BMP's must be applied to all projects. Source
control BMP's must be selected, designed, maintained according to the reference Ecology Manual.
The intent of source control BMP's is to prevent stormwater from coming in contact with pollutants.
They are a cost-effective means of reducing pollutants in stormwater, and, therefore, should be
considered in all projects.
Single Family Residential Construction Projects and Residential Subdivisions are Exempt from
this Minimum Requirement
All Commercial Properties, Industrial Properties, and Multi-Family Properties, Boatyards, Sand and
Gravel Mining Opertations are required to comply with this Minimum Requirement.
Refer to Chapter IV-2.1 Applicable (Mandatory) Operationsal Source Control BMP's
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 4 (MINIMUM REQUIREMENT#4)
• Minimum Requirement#4— Preservation of Natural Drainage Systems and Outfalls
Natural drainage patterns shall be maintained and discharges from the project shall occur at the natural
location, to maximum extent practicable. The manner by which runoff is discharged from the project site
must not cause a significant adverse impact to downstream receiving waters and down gradient
properties. All outfalls require energy dissipation.
The objective is to preserve and utilize drainage systems to the fullest extent because of the multiple
stormwater benefits these systems provide; and to prevent erosion at the downstream of the discharge
location.
Refer to the reference manual for supplemental guidelines and additional information under this
section.
Will this project disturb the Natural Drainage System or Outfall of the project Site? No.
If yes, refer to section 1.2.5.4 for Supplemental Guidelines for additional information.
No change in drainage is proposed for this site. Sheet flow dispersion and a perforated stub
out connection will be utilized to control runoff.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
TAB 5 (MINIMUM REQUIREMENT#5)
• Minimum Requirement#5— On-site Stormwater Management
Project thresholds that trigger Minimum Requirements#1 through #5, shall utilize the On-site
Stormwater Management BMP's from List#1 for all surfaces within each type of surface in List#1; or,
Demonstrate compliance with the LID Performance Standard. Projects selecting this option cannot use
Rain Gardens. They may choose to use Bioretention BMP's as described in Chapter V-7— Infiltration
and Bioretention Treatment Facilities to achieve the LID Performance Standard.
Refer to this section of the reference Manual for all Feasibility or infeasibility Criteria for List#1
and List#2.
Is this project Flow Control Exempt?Yes (See Appendix l-E: Flow Control-Exempt Surface Water).
If yes, provide reasoning from the applicability section of 1-2.5.7 Minimum Requirement#7: Flow
Control). If No, then the project triggers Minimum Requirement#7 (1-2.5.7) and possibly Minimum
Requirement#8 (1-2.5.8).
The flow from this site has a direct discharge to Fidalgo Bay or a flow control exempt body of
water.
If the project is Flow Control Exempt, select from the list below (Skip List 1 and List 2).
o BMP T5.13 Post Construction Soils Quality and Depth
o BMP T5.10A: Downspout Full Infiltration, or;
o BMP T5.10B Downspout Dispersion Systems, or;
o BMP T5.10C: Perforated Stub-out Connections, or;
o BMP T5.11 Concentrated Flow Dispersion, or;
o BMP T5.12 Sheet Flow Dispersion
All sites are required to utilize BMP T5.13 — Post Construction Soil Quality and Depth.
For each surface, consider the BMP's in the order listed for that type of surface. Use the first BMP that
is considered feasible. No other on-site Stormwater Management BMP is necessary for that surface.
Feasiblity shall be determined by evaluation against:
1. Design criteria, limitations and infeasiblity criteria identified for each BMP in this manual, and;
2. Competing needs criteria listed in Chapter V-5—On-site Stormwater Management.
Lawn and Landscaped Area:
• BMP T5.13: Post-Construction Soil Quality and Depth. (Attach Detail in Report)
Refer to this site for requirements and specifications. All projects are required to utilize this BMP.
http://www.soilsforsalmon.org/pdf/Soil BMP Manual.pdf
See Appendix 3 for the "Model Soil Management Plan for BMP T5.13" to be submitted with
Drainage Report and Application Material.
An alternate document acceptable to the City of Anacortes is a Test Report provided by the Soils
Supplier that identifies the soils to be used meet the specifications outlined under Minimum
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
Requirement 5. The specifications are in both WSDOT and CSI Formats. For specifications, refer to
the above referenced PDF.
This submittal can be a deferred submittal since most projects are not sure who the supplier will be
at the time of building permit application. For projects that trigger Minimum Requirements 1 through
5, the Test Report will be provided to the Building Department. Projects triggering Minimum
Requirements 1 through 9, the Test Report will be provided to the Engineering Department.
BMP T5.10C: Perforated Stub-out Connections
Roof downspouts will be collect to the northeast corner of the house and pass through
the perforated stub-out prior to discharging to
o BMP T5.12 Sheet Flow Dispersion
The concrete apron on the north side of the property will be sloped to the east to disperse surface
water onto the adjoining landscaping and grass. The gravel parking at the rear or south side of
the site will also sheet onto the adjoining lawn.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
111-3.1.3 Perforated Stub Out Connections (BMP T5.10C)
A perforated stub out connection is a length of perforated pipe within a gravel filled
trench that is placed between roof downspouts and a stub out to the local drainage sys-
tem. Figure I11-3.1.8 Perforated Stub-Out Connection (p.466)illustrates a perforated stub
out connection.These systems are intended to provide some infiltration during drier
months. During the wet winter months,they may provide little or no flow control.
Applications & Limitations
Perforated stub-outs are not appropriate when seasonal water table is less than one foot
below trench bottom.
In projects subject to I-2.5.5 Minimum Requirement#5: On-site Stormwater Management
(p.55), perforated stub-out connections may be used only when all other higher priority
on-site stormwater management BMPs are not feasible, per the criteria for each of those
BMPs.
Select the location of the connection to allow a maximum amount of runoff to infiltrate
into the ground (ideally a dry, relatively well drained, location). To facilitate maintenance,
do not locate the perforated pipe portion of the system under impervious or heavily com-
pacted (e.g., driveways and parking areas) surfaces. Use the same setbacks as for infilt-
ration trenches in III-3.1.1 Downspout Full Infiltration Systems(BMP T5.10A) (p.452)_
Have a licensed geologist, hydrogeologist, or engineering geologist evaluate potential
runoff discharges towards landslide hazard areas. Do not place the perforated portion of
the pipe on or above slopes greater than 20% or above erosion hazard areas without
evaluation by a professional engineer with geotechnical expertise or qualified geologist
and jurisdiction approval.
For sites with septic systems,the perforated portion of the pipe must be downgradient of
the drainfield primary and reserve areas. This requirement can be waived if site topo-
graphy will clearly prohibit flows from intersecting the drainfield or where site conditions
(soil permeability, distance between systems, etc.)indicate that this is unnecessary.
Design Criteria
Perforated stub out connections consist of at least 10 feet of perforated pipe per 5,000
square feet of roof area laid in a level,2 foot wide trench backfilled with washed drain
rock. Extend the drain rock to a depth of at least 8 inches below the bottom of the pipe
and cover the pipe. Lay the pipe level and cover the rock trench with filter fabric and 6
inches of fill (see Figure 111-3.1.8 Perforated Stub-Out Connection (p.466)).
Runoff Model Representation
Any flow reduction is variable and unpredictable. No computer modeling techniques are
allowed that would predict any reduction in flow rates and volumes from the connected
2014 Stotmwater Management Manual for Western Washington
Volume III- Chapter3-Page 465
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
area.
Figure 111-3.1.8 Perforated Stub-Out Connection
random fill
' R 'S filter fabric
18"min. T Afirg ; 'lr. mill 4"pertpipe
r' i:
1:0•11-,%:41,"!...„,7-',...a..°7-.41,.....t,4-007.-.....=-',,r_evai.---ii 1/,"-x."washed rock
- — 24"min.
Trench X-Section
slope ---B.-
to road
drainage system
2 x 10'
level trench
a 1perfpipe
Plan View of Roof
NOT TO SCALE
iftillEM Figure III-3.1 .8
1411101111 Perforated Stub-Out Connection
DEPARTMENT OF Revised December 2015
ECOLOGY Please see htfpJrWww.ecy.wa.gou/copynght.html for copyright notice including permissions,
,State of Washington limitation of liability,and disclaimer.
2014 Stonnwater Management Manual for Western Washington
Volume Ill- Chapter 3-Page 466
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
APPENDIX 3— Model Soil Management Plan for BMP T5.13
An alternate document acceptable to the City of Anacortes is a Test Report provided by the Soils Supplier that
identifies the soils to be used meet the specifications outlined under Minimum Requirement 5. The
specifications are in both WSDOT and CSI Formats. For specifications, refer to the above referenced PDF.
This submittal can be a deferred submittal since most projects are not sure who the supplier will be at the time
of building permit application. For projects that trigger Minimum Requirements 1 through 5, the Test Report will
be provided to the Building Department. Projects triggering Minimum Requirements 1 through 9, the Test
Report will be provided to the Engineering Department.
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
APPENDIX 4— Determining Construction Site Sediment Damage Potential (Appendix 7—NPDES Phase
II Permit)
Note: See attached. All projects within the City of Anacortes are required to complete that document under
Appendix 4.
Western Washington Phase II Stormwater Permit
i. APPENDIX 7 — Determining Construction Site
Sediment Damage Potential
The following rating system allows objective evaluation of a particular development site's potential to
discharge sediment. Permittees may use the rating system below or develop alternative process
designed to identify site-specific features which indicate that the site must be inspected prior to clearing
and construction. Any alternative evaluation process must be documented and provide for equivalent
environmental review.
Step one is to determine if there is a sediment/erosion sensitive feature downstream of the development
site. If there is such a site downstream complete step two, assessment of hydraulic nearness. If there is
a sediment/erosion sensitive feature and it is hydraulically near the site then go to step three to
determine the construction site sediment transport potential.
. STEP 1 —Sediment/Erosion Sensitive Feature Identification
Sediment/erosion sensitive features are areas subject to significant degradation due to the effect of
sediment deposition or erosion. Special protection must be provided to protect them.
Sediment/erosion sensitive features include but are not limited to:
i. Salmonid bearing fresh water streams and their tributaries or freshwater streams that
would be Salmonid bearing if not for anthropogenic barriers;
ii. Lakes;
iii. Category I, II, and III wetlands;
iv. Marine near-shore habitat;
v. Sites containing contaminated soils where erosion could cause dispersal of
contaminants; and
vi. Steep slopes (25% or greater) associated with one of the above features.
Identify any sediment/erosion sensitive features, and proceed to step two. If there are none the assessment
is complete.
i. STEP 2— Hydraulic Nearness Assessment
Sites are hydraulically near a feature if the pollutant load and peak quantity of runoff from the site will not
be naturally attenuated before entering the feature. The conditions that render a site hydraulically near
to a feature include, but are not limited to, the following:
i. The feature or a buffer to protect the feature is within 200 feet downstream of the site.
ii. Runoff from the site is tight-lined to the feature or flows to the feature through a channel
or ditch.
': I ,v' iactJanuary /6, 2015 1 z..
Poten:'ia! Page 1 of 3
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
A site is not hydraulically near a feature if one of the following takes place to provide attenuation
before runoff from the site enters the feature:
iv. Sheet flow through a vegetated area with dense ground cover
v. Flow through a wetland not included as a sensitive feature
vi. Flow through a significant shallow or adverse slope, not in a conveyance
channel, between the site and the sensitive feature.
Identify any of the sediment/erosion sensitive features from step one that are hydraulically near
the site, and proceed to step three. If none of the sediment/erosion sensitive features are
hydraulically near the site, the assessment is complete.
vii. STEP 3 —Construction Site Sediment Transport Potential
Using the worksheet below, determine the total points for each development site. Assign points
based on the most critical condition that affects 10% or more of the site.
If soil testing has been performed on site, the results should be used to determine the
predominant soil type on the site. Otherwise, soil information should be obtained from the
county soil survey to determine Hydrologic Soil Group (Table of Engineering Index Properties
for step 1.D) and Erosion Potential (Table of Water Features for step 1.E)
When using the county soil survey, the dominant soil type may be in question, particularly when
the site falls on a boundary between two soil types or when one of two soil types may be present
on a site. In this case, the soil type resulting in the most points on the rating system will be
assumed unless site soil tests indicate that another soil type dominates the site.
Use the point score from Step 3 to determine whether the development site has a high potential
for sediment transport off of the site.
Total Score Transport Rating
<100 Low
1100 High
A high transport rating indicates a higher risk that the site will generate sediment contaminated
runoff.
Con t+ rr udion S6t h S edfinent Transport PotenaS 'Worksheet
A . Existing slope of site (average , weighted by aerial extent); Points
2 % or less • • 0
> 2 0 5 O/y u v v n v a n \ ] • e v n n e \ ) r r a • a a ) a ) r v ) • • • • ) • s • a • e • v v c c v n e v • • • • e • a v v v v v • c a a v
> 5 0 1 O' % \ • n . . . ➢ p • o e v [ • c n a . c n • • ➢ v p e e a . a ➢ n n e n c • n a a c v p e • • v • • Sinatra [ a c c a c c c p v e e e a v • • • a • e a • • a a n . e n . p ➢ 1 5
> 1 0 - 1 5 O/O v ➢ c v c v v v v e a • v • • • • • • • • • • • • • a • „ aim . a • e • • • • a a a . v a n v v a a v e . v v v v v v v c v v a a c v v a e c e v • e v v v v v v v e v 30
> 15 % • ea 50
• • a ■ Y c • n n • v . • • • • • • • • • a • a v • • • • n a n a v • n e v a a e v v c c v c v v c v .e • c • v c v v v c ➢ c e v v n n a v a • . a • \ • • • v e •
B . Site Area to be cleared and/or graded :
< 5 , 000 sq . ft 0
5 , 000 sq . ft . — I acre • avaapppe \ e \ nep ➢ • ] tan Cap { Cvuvveppaa [ p • v \ • • • • vv • e • • 30
> • acres . . . . . . v • • a ➢ e c • e • a a ➢ I v L v • • • • • • • • • • • a • • • • • • • • a v v v a e v p C a p c �. c p v p i v v e v n a a a a [ v v a a . . . . . . v .l p p ] v v 50
C . Quantity of cut and/or fill on site :
< 500 cubic yards a nCanL . e • . n pn 1
v tl v v c v ➢ v e c • p v • a v • • • • • • • • v v c v a
500 5 , 000 cubic yards . . . . . . . . . . . . . . . . . . . . . . . . . . . . ve • • • a • • • v [ v aa • •
> 5 , 000 — 10 , 000 cubic yards 10
> 10 , 000 — 20 , 000 cubic yards 25
> 20 , 000 cubic yards 40
D . wunoff potential of predominant soils ( Natural Resources Conservation Service ); Hydrologic
soil group A 0
Hydrologic soil group B 10
Hydrologic soil group C 20
Hydrologic soil group D 40
E . Erosion Potential of predominant soils ( Unified Classification System ) : GW , GP , SW ,
SP soils 0
Dual classifications ( GWGM , GP � GM , GW- GC ,
GP - GC , SW- SM , SW- SC , SPOSM. , SP - SC ) 10
GM , GC , SM , SC soils 20
ML , CL , MH , CH soils 40
F . Surface or Groundwater entering site identified and intercepted 1 :
Yes C
No 25
G . Depth of cut or height of fill > 10 feet :
Yes 25
No 0
I b Clearing and grading will occur in the wet season(October 1 -- May 1 ) : Yes 50
No 0
TOTALn n �JjR�(rn_ �(((r/^J$./�J (InI( 11(n\`o(I (I�l( _ _`y/l, {'(/�•j)
1 P Il L1 L Pal a• u J `l S . . • v v 4 . a a v v v • \ a a a a v n n a n n a . c e p v v a ➢ v a c v .L . e • a • • v e e • p . . • • . . e v a a e v . v e v • • • • . • a a • • a n • ! v • v p • v . v . e • • • • V V
If no surface or groundwater enters site , give 0 points .
g
EROSION CONTROL NOTES
10th Street A. A CERTIFIED EROSION AND SEDIMENTATION CONTROL SUPERVISOR (ESC) IS REQUIRED.
THE ESC SUPERVISOR MUST HAVE ATTENDED A CERTIFIED EROSION AND SEDIMENTATION
CONTROL CALSS WITHIN 3-YEARS FROM TODAY'S DATE. MUST PROVIDE CERTIFICATION I ',
B, THE CERTIFIED EROSION AND SEDIMENTATION CONTROL SUPERVISOR WILL OVERSEE AND
BMP C105 OR C107 REMOVE & REPLACE DE RESPONSIBLE FOR ALL EROSION CONTROL. THE FACILITIES SHALL DE INSPECTED DAILY
\ TEMP. CONSTRUCTION DRIVE & TRAFFIC INLET PROTECTION AND MAINTAINED TO ENSURE PROPER FUNCTIONING, WRITTEN RECORDS SHALL BE KEPT •
OF WEEKLY REVIEWS AND AFTER EVERY SIGNIFICANT STORM EVENT OF THE ESC FACILITIES I
ENTRANCE CURB AND GUTTER BMP C220 DURING THE WET SEASON (OCTOBER 1 TO APRIL 30). MONTHLY REVIEWS DURING THE
DRY SEASON (HAY 1 TO SEPTEMBER 30). WRITTEN RECORDS SHALL DE TURNED INTO THE Z
FACE OF CURB WSDOT DETAIL I-40-20,00 PROJECT MANAGER OR INSPECTOR ON A WEEKLY BASIS AT THE WEEKLY SCHEDULED O
CB AT KINGSWAY PROJECT MEETINGS. i C/)
BMP C154 • l drvelMay d gp C PRIOR CONYROL MEASURES SHALL BE IN PLACE PER THE APPROVED SET OF PLANS
CONCRETE WASHOUT ,ater meter o `�
aci
TUB NO DIRECT . D. THE EROSION CONTROL SHALL DE INSPECTED ONCE A DAY AND MODIFIED TO MEET THE
DISCHARGE TO EXISTING ` EXIST, `� SURROUNDING CONDITIONS AS NEEDED. CS o
BURLINGTON CB E PROVIDE A SIGN DISPLAYING A 2A-HOUR CONTACT NUMBER AND NAME OF TIRE ESC '�i CD
co
SOILS SUPERVISOR. THE LETTER SIZE SHALL BE A MINIMUM OF 2-INCH LETTERS. THIS SHALL BE I
EX. SIDEWALK IN PLACE PRIOR TO CONSTRUCTION START. REMEMBER, THE LOOK OF THE SIGN WILL BE A C...5
< REFLECTION OF THE CONTRACTOR, DEVELOPER AND DEVELOPMENT. Ci rn I
BMP C233 —� o CrOrn SD L F. THE STORM DRAIN SYSTEM AND EXISTING DITCHES SHALL DE CLEANED DAILY (SECTION 7- f3�
SILT FENCE i N 89 ^ ' 60,Oi w:r$raP;• 23 ':'` '' -':':' ISO LF 6' PVC SD O SD 07.3). ALL DRAINAGE SYSTEMS SHALL BE CLEANED TO THE ACCEPTANCE OF THE CITY OF `I - o
; C,O, AMACORTES PRIOR TO THE ACCEPTANCE OF THE PROJECT. A c�
r r •::-SILT"FEN�F' REMOVE AND C.O. �t 1Y1 c`.
/! r°':''•.•'. REPLACE CONCRETE G. STABILIZED TIONACONSTRUCTION ENTRANCES AND ROADS SHALL DE INSTALLED AT THE BEGINNING C/� f3� O
BMP C123 � . pBlv(IS:75 �'O�' LE ,_ L \ D
OF CONSTRUCTION AND MAINTAINED DURING THE DURATION OF THE PROJECT. ADDITIONALTEMP• SOIL STOCKPILE �', I
•-}•FRFR'S 8!C� SIDEWALK PANEL MEASURES MAY DE REQUIRED SUCH AS WASH PADS TO ENSURE THAT ALL PAVED AREAS ARE rh
1`7rt S KEPT CLEAN. NO MUD IS ALLOWED TO ENTER ONTO CITY STREETS. N
/ E(SNNEGI tON<'1A . IN �I C!]
.::::70,,
COVERING WITH /'� ...PET
H. ANY SOILS EXPOSED THAT WILL NOT BE DISTURBED FOR TWO (2) DAYS DURING THE WET r,S
\:`� I GCN�1N',£EC�blfAlL. SEASON OR SEVEN (7) DAYS IN THE DRY SEASON SHALL DE IMMEDIATELY STABILIZED WITH '—'
STRAW OR VISQUEEN M \ '. = FENCE X X - X X APPROVED ESC METHODS (SEEDING, MULCHING, PLASTIC COVERING, ETC.) [Y r
& SILT FENCE AROUND x I I \ �_..�,.:.. `:::ti,.,:... ^�{
I. TWO <2> WEEKS PRIOR TO THE DEGINN[NG OF THE WET SEASON (OCTOBER 1>, ALL DISTURBED • [T� �, „,--
AREAS I SIDES, / st' •
— _1 _ I X GAS THE WINTERL BE RAINS.EVIEWED TO DISTURBED AREASIFY SHALL BEH ONES SEEDEDCAN DE SEEDED IN WITHIN ONE (I) WEEK OF THEN FOR r, .
BEGINNING OF THE WET SEASON. A SKETCH MAP OF THOSE AREAS TO BE SEEDED AND THOSE 1'T-4 O
�DN UBMP C24d '' AREAS TO REMAIN UNCOVERED SHALL DE SUBMITTED TO THE PROJECT MANAGER THE PROJECT W UNDERGROUND MANAGER CAN REQUIRE ADDITIONAL AREAS IN ORDER TO PROTECT SURFACE WATERS, ADJACENT .� •d
�.': : TEMP SEDIMENT UGP PROPERTIES OR DRAINAGE FACILITIES. �
l; -XISItin Residence 1 IF CONDITION POWERA `"
1 9 y, REQUIRE J. PENALTIES FOR AN EROSION CONTROL VIOLATION ARE SUBJECT TO A r300 TO SL000 FINE
SANITARY UNDER CHAPTER 17.66 - PENALTIES FOR VIOLATION (AMC). EACH DAY IS CONSIDERED
A DIFFERENT VIOLATION.
front ts}fe' win (� CAI TRAP 8'X8' Ss REMOVE ALL TEMPORARY EROSION CONTROL MEASURE WHEN TIE SITE IS LANDSCAPED AND SOILS ARE
�, Addition IJD SEE DETAIL SEWER STABI ,
BMP C103 ` 1791 SF 1 Cr)
j HIGH VISIBILITY :**CCD STORM ALL DEWATBSNG SHALL DISCHARGE IHIo A SEOIMANF TRAP OR SEDIMENT POND.
FENCE AS ' ' W THE CONTRACTOR IS TO PROVIDE TO TIE CRY INSPECTOR THEM SPILL PREVENTION PROGRAM TO DE INPLACE
ri''w SEWER SD
REQUIRED IF NO O GAA I DURING CONSTRUCTION.
FENCE EXIST, o < ` 1 a) - WATER `�
o Co eyed Porci MAIN
z f v, I? BMP T5,13 POST-CONSTRUCTION SOIL o
in t QUALITY AND DEPTH ON ALL Catch Basin 0 N
BMP T5.13 x DISTURBED SOILS Sanitary Sewer Clean Out ° U r�l a,
9 I Z CURB/GUntlt AND SIOEVIAIJ( WORKMANSHIP AND AESTHETICS v cm
POST-CONSTRUCTION SOIL g ., >t Water Meter ® ? �, OD
QUALITY AND DEPTH ON D l0 1 ':,'r.:`.'1,^. 1. CURB/GUTTER AND SIDEVIALK CONSTRUCTION SHALL FOLLOW A TRUE AND UNIFORM Q� F7 a'
47,
ALL DISTURBED SOILS rr' • - HORIZONTAL AND VERTICAL ALIGNMENT. r-CJ 1 r:t
��'� '.'�g4fered Gar-Port,`•` 2, THE VERTICAL AID HORIZONTAL SURFACE SHALL BE A SMOOTH BROOM FINISH WITIH -r--4 -d aaq=
`1. `\ " • •• :' NO DETECTABLE FINISHING BLEMISHES. UNDULATIONS, RIPPLES, SWELLS, WAVES, RUTS, En ,,
deck\ NO �. (pp �- X �, ry SECTIIN c-c FURROWS, GRAFFITI OR OTHER OBJECTIONABLE MARKS.THE END RESULT SHALL BE A co ai
11' /2r' r- NEAT AND PROFESSIONALLY FINISHED APPEARANCE.
SS ` —' 's ' �' °L•; r O' -' 1' 3. THE EDGE FINISH ADJACENT TO THE EXPANSION JOINT MATERIAL SHALL BE CLEAN AND +r(j Tyr a`#i
t ���_ r'• ••••i, p DS ( 1' FREE OF EXCESS SLURRY.THE EXPANSION JOINT MATERIAL SHALL BE TRIMMED TO A
.— _ -- :• —3S' \UVERiM DIIDV.RIE ID SiA DRIVEWAY
.,
thy_ LEVEL EVEN WRH TFIE AOJACENf CONCRETE RESULTING IN A NEAT AND PROFESSIONALLY r-i
- � r.(•RDac WRAP cONVEYNt[m uwevnr FINISHED APPEARANCE. �T----1(
at SIX Donut ELEV. a1 SITE .,' '.•:::::, r:1 �r,'YZ _:;..•,: ,•..ua1
EXISTING SIDE SEWER /� a nz 4.THE CRY ENGINEER IN HIS SOLE DISCRETION RESERVES THE AUIHORIY TO ORDER THE C -I-- G
CROSSES PROPERTY rlAT 1QTiM I' vfs�RICK mlecmF REMOVAL OF SECTIONS OF CURB/GUTTER AND SIDEWALK THAT DO NOT MEET THE 0 0
x r GRAVEL BMP C233
BMP C103 APPROX. AS SHOWN PER s SILT FENCE WORKMANSHIP AND AESTHETIC STANDARDS OF THE CITY OF ANACORTES.
X TYPICAL TRAP CROSS SECTION B—B —1 )
HIGH VISIBILITY : CITY RECORDS. DRIVE 5. SECITONS OF NEWLY CONSTRUCTED CURB/GUTTER AND SIDEWALK THAT EXHIBIT ..�
FENCE AS 407 F`.-• NEW 4' SIDE SCALEf 1''5' CRACKING FOLLOWING THE CURING, SHALL BE SUBJECT TO REMOVAL AND REPLACEMENT. r--4 .-i
REQUIRED IF NO X X tel ped - CRACKING RESULTING FROM SUB-BASE FAILURE OR CONSTRUCTION SITE DAMAGE -r--i
•
f SEWER. ] Ha161EPttI SHALL BE IMMEDIATELY REMOVED AND REPLACED TO THE NEAREST EXPANSION JOINT.
FENCE EXIST, X X - MINOR I-WR UNE STRESS CRACKS MAY, AT THE DISCRETION OF THE PROJECT
a A d ` -;,, -•-,„ , sp -Li,��1-ilteItl/ MANAGER, BE MONITORED AND RE-EVALUATED FOR POSSIBLE REMOVAL AT THE END OF
N 89 26 2z W 60,04'—r� \� e•-t'RI= 'THE MAINTENANCE PERIOD.
y It .r
\�f - 20' MAX L�IITEXTILE -,=�i VADEO•
s s � vnsm ROCK
r
�� alley SJ TRAP OUTLET SECTION C—C CONSTRUCTION SCHEDULE
SCALE' I'5'
— -- — - 1. Install BMP C105 CnnstructIon Entrance, BHP C233 Silt Fence,DNP C103 IDOh Visibility r-4
Construclton Fence and catch basin sock Inserts. O
I 2. Install DHP C154, Concrete Vashout Basin F. 4
3, Install DHP C240,Sednent Trap as required
LOT AREA = 6,000 SF 5, Excavation
f otoffor and tins and utilities. -}—)
6, Dact<fill foundation and add additlonnl DHP's to nhnlze Sedlnent transfer anal erosion.
0
7• Install dispersion trench,Protect Infiltration trench Fran sedinent until site Is stabilized, rS-••I
IMPERVIOUS AREAS B. Construct hone wlay gutters and connect toall, n lea V -� p�w p
HOUSE ROOF 2,283 SF 10.9. Connect to driveway as soon as concrete..ta e !A F'T'
7n tallation of IMP T5,13 Post Ccrostruclto S¢� n pin r v r,.:,
CONSTRUCTION STANDARDS ��JJ `} 1,,,_;„ �� 't'•' t �1,�:
PORCH AND RAMP 196 SF �� •�,. _ +''` r—{
SIDEWALK AND PATIO 392 SF ALL IMPROVEMENTS IN CITY RIGHT-OF-VAT SHALL BE CONSTRUCTED TB THE CURRENT VSDOT f I ,I
SPECIFICATION AND CURRENT CITY OF ANACORTES ENGINEERING STANDARDS. I;• JAN �j � No III,, j -c
GRAVEL PARKING 407 SF
TOTAL 3,278 SF I
0
Cid
SOIL AMENDMENT NOTE �' N I 0
ri�Y
• BHP T5,13r POST CONSTRUCTION SOIL DUALITY AND DEPTH —'
GRAPHIC SCALESEE APPENDIX OF DRAINAGE REPORT FOR SPECIFICATION ON PROVIDING SOIL AMENDMENTS FOR ALL This Tlan shed is oeag4d for rm Uudion in ecmfdaxa rill;the
10 .liec0 5 10 20 40 DISTURBED SOILS DLIT SIDE ElF IMPERVIOUS AREA AROUND BUILDING AND PAVED AREAS. Gly of Anomie,ordnance,and palcia. Actual conlofmonco of Um SlIEET NO,
NERR�ir dmien with applIcoble loan Is the solo re:pen:00y of the
v.c,o' 'a prolecolond engines*,atone soma and stomp appear on this till. C 1
T A sing,complying with,and ptmidng m'UgoSon kr on Federal,
A c i" �] f j Slvte County,and Local Lun permfb,and rnendaln ndudng but
not roiled to(ha Endangered Spades Act. d Nciotfd Pam14 RE1•-
] Inch a 10 IL � `1 i Nord
Department of Fisheries Ilydrmim Panel.Fedad Flood Kin
JJJ JJJ , 27807 Q• Puma:,National Pollutant Godmpo ET/Woolen Syslan Penal 13 1JOB NO:201D-165
1. "�:r ° ':%" thu rmpons3Tly of Um Dania"Landow.and Uric Engineer.
�TON/d.�' TIw Issuanco of Ili,pamil atoll not be caolnkd as proof at I DATE: Jan.2020
canplana with opplkoblc Ian end permit ecqurasnrnta SCALE:Noted
........_.... ).5..%..el.....e,„,....f.„
January 14. 2020 DRAWN: D. IIERIUGSTAD
CITY ENGINEER DATE ,CIIECE D. IIERRIGSTAD
The acceptance will expire one year from the date I
noted abort. 1
1
APPENDIX 6— Documented Site Photos (Show all directions of the site, including frontage)
(Insert Photo Here)
Location: 1211 10h Street
Description of the photo: From 10th Street looking South. BIM house to be removed.
Photo taken by: Dele Herrigstsd December 16, 2019.
__
/1 ` ." -
V = ill
_ rF
assommilig
Photo at alley looking northwest. Garage to be removed.
a{ 11 1•
...I./ t .' ' yRi._
r j
APPENDIX 7— Drainage BMP Facility Maintenance Covenant
Note: To be recorded prior to: 1)Temporary Certificate of Occupancy; 2) Final Certificate of Occupancy, and
or; 3) Final Acceptance of the project.
This is Covenant is required for any Permanent Stormwater Facility constructed on a project site. The applicant
should work with the the City of Anacortes Engineering Department on formalizing the document for recording.
Not needed for Perforated Stub uit.
Figure 11-4.1.1 Stabilized Construction Entrance
NOT TO SCALE
boa
aieidkkit
Y— 1 �`f—�, ter.
/�//// ',�!. •=`zs.'ti.•=� 100'min.
Install driveway �� lt
culvert if there is a • : . . . .0%
roadside ditch present —•pY— —•�--���Y—��
4"-8"quarry �. �. . .
spats �� � . �iiP Ai
l P•Ateat,
Geotextile LTeAr.so IP.so
Notes: 15'min.
1. Driveway shall meet 12"minimum thickness
the requirements of the
permitting agency.
2. It is recommended that Provide full width
the entrance be of ingress/egress
crowned so that runoff area
drains off the pad.
Figure 11-4.1 .1
Stabilized Construction Entrance
DEPARTMENT OF Revised June 2015
ECOLOGY Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
State of Washington limitation of liability,and disclaimer.
2014 Stormwater Management Manual for Western Washington
Volume 11- Chapter 4 -Page 273
BMP C107: Construction Road/Parking Area Stabilization
Purpose
Stabilizing subdivision roads, parking areas, and other on-site vehicle transportation
routes immediately after grading reduces erosion caused by construction traffic or runoff.
Conditions of Use
Roads or parking areas shall be stabilized wherever they are constructed, whether per-
manent or temporary, for use by construction traffic.
. High Visibility Fencing (see BMP C103: High Visibility Fence (p.269)) shall be
installed, if necessary, to limit the access of vehicles to only those roads and park-
ing areas that are stabilized.
Design and Installation Specifications
. On areas that will receive asphalt as part of the project, install the first lift as soon
as possible.
. A 6-inch depth of 2-to 4-inch crushed rock, gravel base, or crushed surfacing base
course shall be applied immediately after grading or utility installation.A 4-inch
course of asphalt treated base (ATB) may also be used, or the road/parking area
may be paved. It may also be possible to use cement or calcium chloride for soil
stabilization. If cement or cement kiln dust is used for roadbase stabilization, pH
monitoring and BMPs (BMP C252: High pH Neutralization Using CO2 (p.409) and
BMP C253: pH Control for High pH Water(p.412)) are necessary to evaluate and
minimize the effects on stormwater. If the area will not be used for permanent
roads, parking areas, or structures, a 6-inch depth of hog fuel may also be used,
but this is likely to require more maintenance. Whenever possible, construction
roads and parking areas shall be placed on a firm, compacted subgrade.
. Temporary road gradients shall not exceed 15 percent. Roadways shall be care-
fully graded to drain. Drainage ditches shall be provided on each side of the road-
way in the case of a crowned section, or on one side in the case of a super-
elevated section. Drainage ditches shall be directed to a sediment control BMP.
. Rather than relying on ditches, it may also be possible to grade the road so that run-
off sheet-flows into a heavily vegetated area with a well-developed topsoil. Land-
scaped areas are not adequate. If this area has at least 50 feet of vegetation that
water can flow through, then it is generally preferable to use the vegetation to treat
runoff, rather than a sediment pond or trap. The 50 feet shall not include wetlands
or their buffers. If runoff is allowed to sheetflow through adjacent vegetated areas, it
is vital to design the roadways and parking areas so that no concentrated runoff is
created.
2014 Stormwater Management Manual for Western Washington
Volume II- Chapter 4 -Page 277
• Storm drain inlets shall be protected to prevent sediment-laden water entering the
storm drain system (see BMP C220: Storm Drain Inlet Protection (p.357)).
Maintenance Standards
Inspect stabilized areas regularly, especially after large storm events.
Crushed rock, gravel base, etc., shall be added as required to maintain a stable driving
surface and to stabilize any areas that have eroded.
Following construction, these areas shall be restored to pre-construction condition or bet-
ter to prevent future erosion.
Perform street cleaning at the end of each day or more often if necessary.
BMP C120: Temporary and Permanent Seeding
Purpose
Seeding reduces erosion by stabilizing exposed soils. A well-established vegetative
cover is one of the most effective methods of-reducing erosion.
Conditions of Use
Use seeding throughout the project on disturbed areas that have reached final grade or
that will remain unworked for more than 30 days.
The optimum seeding windows for western Washington are April 1 through June 30 and
September 1 through October 1.
Between July 1 and August 30 seeding requires irrigation until 75 percent grass cover is
established.
Between October 1 and March 30 seeding requires a cover of mulch with straw or an
erosion control blanket until 75 percent grass cover is established.
Review all disturbed areas in late August to early September and complete all seeding
by the end of September. Otherwise, vegetation will not establish itself enough to
provide more than average protection.
• Mulch is required at all times for seeding because it protects seeds from heat, mois-
ture loss, and transport due to runoff. Mulch can be applied on top of the seed or
simultaneously by hydroseeding. See BMP C121: Mulching (p.284)for spe-
cifications.
• Seed and mulch, all disturbed areas not otherwise vegetated at final site sta-
bilization. Final stabilization means the completion of all soil disturbing activities at
the site and the establishment of a permanent vegetative cover, or equivalent per-
2014 Stormwater Management Manual for Western Washington
Volume II- Chapter 4 -Page 278
Figure 11-4.1 .7a Concrete Washout Area
1. - 3m Minimum
o 0 ° ° Lath and flagging
( ) 0 ( on 3 sides
0 Ui/— Sandbag
it 0 o Berm Sandbag
10 mil plastic lining
Varies U
A U `
o ,� 1m
[1 Berm
0 0 0 0 (n / /\ /\ \ 0 ° Section A-A
\___<10 mil plastic lining
Plan Notes:
1. Actual layout
determined in the field.
Type "Below Grade" 2. A concrete washout
sign shall be installed
within 10 m of the
vi 3m Minimum ` temporary concrete
washout facility.
vi El
Wood frame
B, B securely fastened
around entire
Eg 3 perimeter with two
lining
r°wil
stakes0Varies 10milplastic A
Kg \- Stake (typ.)
1 Er INEr IN Section B-B
10 mil plastic lining
Two-stacked
2x12 rough Plan
wood frame
Type "Above Grade" with Wood Planks
NOT TO SCALE
1131111
M■" Figure I1-4. 1 .7a
IVII Concrete Washout Area
DEPARTMENT OF Revised June 2015
ECOLOGY Please see httpJ/www.ecy.wa.gov/copyright.html for copyright notice including permissions,
State of Washington limitation of liability, and disclaimer.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 322
Figure 11-4.1 .7b Concrete Washout Area
Straw bale
10 mil plastic lining Binding wire
Staples Native material
(2 per bale) (optional)
Wood or Plywood
metal stakes 1200 mm x 610 mm Wood post
(2 per bale) — painted white (89 mm x 89 mm
Lag screws x 2.4 m)
Section Sod (12.5 mm) coNCRErEI�� Black letters
WASHOUT , 150 mm height
915 mm I I v
I ' 915 mm
3m Minimum Washout
Concrete Win
Stake
(typ) et llH (or ec,i th mDerot)
0 0 0 El 0 ❑ 0 0
0
0 ❑BA
Varies —4=-1 50 mm
200 mm nay 3.05 mm dia.
l steel wire
a o
� � a
St 1pDe Dotal'
O 0 00 0 ❑ 0
10 mil plastic lining Notes:
Straw bale 1. Actual layout
(tYP•) determined in the field.
Plan 2. The concrete washout
sign shall be installed
within 10 m of the
temporary concrete
washout facility.
Type "Above Grade" W6 h Straw Sales
NOT TO SCALE
. 111 Figure ll . t o 7Cb
"OW" Concrete Washout Area
DEPARTMENT OF Revised June 2015
ECOLOGY Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
State of Washington limitation of liability, and disclaimer.
•
2014 Stormwater Management Manual for Western Washington
Volume II e Chapter 4 e Page 323
Figure 11-4.2.16 Cross Section of Sediment Trap
Surface area determined 4' Min.
at top of weir _1
1' Min. Overflow
\ 1' Min.
• ,_,__=.•_:,3._.„_„_,,_-_._,__ I
Lk i- T _____ _
:r .; ;;It ar-, 1' Min.
�
L 1
3.5' - 5'
��+ 1.5' Min.
Flat Bottom
%a" - 1.5"
Washed gravel Discharge to
Note: Trap may be formed by berm or by Geotextile stabilized
conveyance,
partial or complete excavation. 2" -4" Rock outlet, or level
spreader
Rip Rap
NOT TO SCALE
1101111
1 '' Figure II-4.2. 16
IIRW"i Cross Section of Sediment Trap
DEPARTMENT OF Revised November 2015
ECOLOGY Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
State of Washington limitation of liability, and disclaimer.
2014 Stormwater Management Manual for Western Washington
Volume ll - Chapter 4 - Page 386
Figure 11-4.2.17 Sediment Trap Outlet
1-...' 6' Min. I
I ICI I ICI I I-I I I®I I ICI I=I I=1 I I-111=l I I-1 11=I 11=1 11=1 11=1 11=1 1 1 I l_ 1' Min. depth overflow spillway II 1 1I I �I=1C=C1I=I IC=�
1 111 1-111=111-111=111=111=111=1111
•.�-�.�.�=�-•-•..•-�.��•:
q. e41i1% f} `y,�i°<ri.-4^�5.44.:�Y= izn�s� : III-1—I `t t-.$1 �ci'�'+tiS� c .v.,r Y t i�'S tf,,Y:+ •.Z �I. I 2" u
11= .�, �"�,. „<��;:,��°�, t,,,}:�.� -�,�,�'�». Min. 1 depth -4 rock
;111=1 1=I 1=11 -111=111=111=111=111 Min. 1' depth 3/4" - 1.51I
Native soil or —III 111 I I III III III III III
compacted backfill washed gravel
Geotextile
NOT TO SCALE
1.3111
1111'' Figure 11-4.2. 17
Sediment Trap Outlet
DEPARTMENT OF Revised November 2015
ECOLOGY Please see http://www.ecywa.gov/copyright.html for copyright notice including permissions,
State of Washington limitation of liability, and disclaimer.
2014 Stormwater Management Manual for Western Washington
Volume 11 - Chanter 4 - Page 387
Figure 11-4.2.12 Silt Fence
Joints in filter fabric shall be spliced
at posts. Use staples, wire rings or
equivalent to attach fabric to posts
2"x2" by 14 Ga. wire or equivalent,
if standard strength fabric used
I
•••• •7■ 0R■iiiii�••i�••+•iiiiiiiiiiiiiii ■■■
ii•••i•♦ ♦ •iii�ii !♦••••••♦♦•••••••••••••••••••••�4�4�4
y-rr rr
11 41 6' max 11
Minimum I I 1
4"x4" trench I
u 1 I
Post spacing may be increased
to 8' if wire backing is used 2 x2 wood posts, steel
fence posts, or equivalent
2"x2" by 14 Ga. wire or equivalent,
if standard strength fabric used
NI
mi
\\
"X t
a
\� \�\ Filter fabric n
\ in
in
j mu
Ii 2' min
it
\\/ El
Backfill trench with //// .,...,,�;
native soil or 34' - / 4rI1
1.5" washed gravel �� �� \/12"min\\ \ \`\
Minimum \/\\/\�
4"x4" trench /'
2"x2"wood posts, steel —/i
fence posts, or equivalent NOT TO SCALE
13111
il10' Figure 11-4.2. 12
IMII Silt Fence
DEPARTMENT OF Revised October 2014
ECOLOGY Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
State of Washington limitation of liability, and disclaimer.
2014 Stormwater Management Manual for Western Washington
Volume 11 - Chanter 4 - Paae 369
DEFERRED SUBMITTAL: PROVIDE A TEST REPORT FROM SOILS SUPPLIER TO THE BUILDiIHO DEPT.
PROJECT INFORMATION "Model Soil Management Plan for BMP T5.13" age# of pages
Complete all information on page 1;only site address and permit number on additional pages.
Site Address/Lot No.: .
Permit Type: Permit Number:
Permit Holder: Phone:
Mailing Address:
Contact Person: Phone:
Plan Prepared By:
1
ATTACHMENTS REQUIRED(Check off required items that are attached to this plan)
Site Plan showing,to scale: Areas of undisturbed native vegetation(no amendment required)
New planting beds and turf areas(amendment required)
Type of soil improvement proposed for each area
Soil test results(required if proposing custom amendment rates)
Product test results for proposed amendments
AREA# (should match Area#on Site Plan)
PLANTING TYPE Turf Undisturbed native vegetation
Planting Beds Other:
SQUARE FOOTAGE OF THIS AREA: square feet
SCARIFICATION inches(depth)of scarification needed to achieve fmished total 12"loosened depth.
Subsoil will be scarified
PRE-APPROVED inches of compost or imported topsoil applied
AMENDMENT METHOD: X 3_1 (conversion factor, inches to cubic yards) PRODUCT:
Topsoil import =cu.yards per 1,000 sq.ft.
Amend with compost X ,000s sq.ft.in this area
Stockpile and amend =cubic yards of amendment QUANTITY: CU.YDS.
( cu.yds.stockpiled) (needed to cover this area to designated depth)
CUSTOM AMENDMENT Attach test results and calculations.
_Topsoil import inches organic matter or topsoil import PRODUCT:
Topsoil&compost lift X 3_1
Amend =cu.yards/1,000 sq.ft.
Stockpile and amend X ,000s sq.ft.in this area
( _cu.yds.stockpiled) =cubic yards of amendment —* QUANTITY: CU.YDS.
MULCH ,000 sq.ft. PRODUCT:
X 6.2 (conversion, to give 2 inch mulch depth)
=cubic yards of mulch -->-->—÷—>——* QUANTITY:. CU.YDS.
TOTAL AMENDMENT/TOPSOIL/MULCH FOR ALL AREAS (complete on page 1 only, totaling all areas/pages in this Plan)
Product#1: ❑ Quantity: cu.yds.
❑ Test Results: %organic matter C:N ratio<25:1(except mulch,or<35:1 for native plants) "stable"(yes/no)
❑ Product#2: ❑ Quantity: cu.yds.
❑ Test Results: %organic matter C:N ratio<25:1(except mulch,or<35:1 for native plants) "stable"(yes/no)
❑ Product#3: ❑Quantity: cu.yds.
❑ Test Results: %organic matter C:N ratio<25:1(except mulch,or<35:1 for native plants) "stable"(yes/no)
Date: Inspector: Approved: Revisions Required:
Date: Inspector: Approved: Revisions Required:
Version Date: October 7, 2019 Previous Version Date: February 20, 2019
ANACORTES PUBLIC WORKS DEPARTMENT
tzY ° Steven Lange, Project Manager
G +�
P.O. BOX 547,ANACORTES,WA 98221 PH(360)293-1920
4V E-MAIL:stevel@cityofanacortes.org FAX(360)293-1938
10010.
'gLO- 2o19 - 03
Memo t2- 11 t � Sr
Date: January 6,2020
To: Dave Oicles(Permitting)and Rob Frisinger(Plans Examiner)
From: Steven Lange
Subject: Site and Drainage Review for 1211 10th Street
cc: Eric Shjarback
The Public Works Engineering completed a review of the submitted December 23, 2019
documents for the Minimum Requirements#1 to#5 and related Site Plan on Tuesday,
January 6, 2020. Below are the findings and recommendations:
SITE PLAN: (Dated December 18, 2019)
1. The information provided in Minimum Requirement 2 — 13 Elements should
match the information provided on the Erosion and Sedimentation Plan.
2. The value of the improvements to the assessed value appear to exceed 150%,
therefore requiring this project to meet the current code with regards to access.
Per AMC 19.53.030, the project has access via an improved alley, therefore the
access needs to be from the Pubic Alley.
3. 20-foot maximum width for driveway access at the alley for residential access,
per AMC 19.53.030, Item B.3.
4. Remove and replace the existing driveway approach with standard Traffic Curb
and Gutter, per WSDOT Standard Detail F-10.12-03.
5. 10' Street has a slope of approximately 2%. AMC 19.76.070 —Conveyance, Item
A.3 identifies that runoff cannot be discharged to a Public Road or Street. Other
projects in the area have installed a 6-inch minimum storm line (Private) behind
the sidewalk and made a connection to the catch basin. Since the pipe is PVC,
locate marking tape will need to be installed in the trench line.
6. See attached COA Vicinity Map for the side sewer that extends to the west
property.
DRAINAGE REPORT (Dated December 23, 2019):
1. Permit Number: BLD-2019-0833.
2. Project Description:
• Provide all required BMP's under Minimum Requirement 5.
• Infiltration is stated to be 5 inches per hour. Is this correct?There is no
soils report to support the information provided.
3. Existing Site Conditions Summary: Agreed.
4. Developed Conditions Summary: Agreed.
5. Applicability Flow Chart (Figure I-2.4.1): is provided, but not the correct flow chart
to use. Please use the Redevelopment Applicability Flow Chart
6. Applicability Flow Chart (Figure I-2.5.1): Accepted January 6, 2020
7. Minimum Requirement 1 — Step 1: Agreed.
8. Minimum Requirement 1 —Step 2: Revise
• Review of the site plan identifies that grading will take place across most
of the entire site. Not just in the area of the foundation dig.
9. Minimum Requirement 1 — Step 3: Agreed.
10. Minimum Requirement 1 — Step 4: Agreed.
11. Minimum Requirement 1 — Step 5: Agreed.
12. Minimum Requirement 1 — Step 6: Agreed.
13. Minimum Requirement 1 — Step 7: Agreed.
14. Minimum Requirement 1 — Step 8: Agreed.
15. Minimum Requirement 2 — Ensure the information provided matches the Erosion
and Sedimentation Plan.
• Element 1: Show on the site plan.
• Element 2: Show on the site plan.
• Element 3: Show on the site plan.
• Element 4—Agreed.
• Element 5: Agreed.
• Element 6: Agreed.
• Element 7: Agreed.
• Element 8: Agreed.
• Element 9: Agreed.
• Element 10: Agreed.
• Element 11: Agreed.
• Element 12: Agreed.
• Element 13: Agreed.
16. Minimum Requirement 3 —Agreed.
17. Minimum Requirement 4—Agreed.
18. Minimum Requirement 5—Agreed.
19. Minimum Requirement 5—Agreed.
20. Appendix 1: Not provided.
21. Appendix 2: Not provided.
22. Appendix 3: Agreed.
23. Appendix 4—Agreed.
24. Appendix 5 — Revise and submit updated plan.
25. Appendix 6 —Agreed.
26. Appendix 7 —Agreed.