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'� * ..'�r�,yyryWryWtlj77� L h t f 1 <br />rf9 ! <br />David and Junghee Spicer <br />JUL 247 02018 L) <br />Soil drainage test following instructions from the rain garden handbook for <br />western washington. <br />Site: 1113 / 1117 F Ave <br />Methodology <br />Date of test: June 24th 2018 <br />We checked with the local municipality to confirm requirements for our <br />project. <br />We considered the location of existing utilities and avoided conflicts. We <br />sited the rain garden in the south side of the house in the yard area well <br />away from any utilities or services running to the house on the north side. <br />We determined how much contributing area would drain to our rain garden. The <br />area of impervious surfaces that would need to drain to the rain garden <br />would be 2568. <br />We observed how drainage flows from the contributing area and picked a <br />location to capture the runoff. We picked an area that worked with the <br />natural drainage patterns of the site towards the bottom of the natural <br />gentle slope of the site. <br />We tested the soil drainage rate in the location to be sure rain will soak <br />into the ground. <br />First we checked for high groundwater. We dug down 36 inches in a seperate <br />hole within 3-5 feet of where we were going to do our soil drainage test. <br />There was no ground water seeping into the hole. <br />We repeated this test 3 times, with each test being performed immediately <br />after completion of the last test, due to carrying out this test in June. <br />The 3rd test was used to calculate the drainage rate. Testing 3 times during <br />the dry season provides a better estimate of wetter conditions present in <br />the winter when the rain garden is doing the most work. <br />Page 1 <br />