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f7 <br /> 79) <br /> FILE COPY <br /> JUL 27208 <br /> David and Junghee Spicer rss@TY N^1nvT _. <br /> Soil drainage test following instructions from the rain garden handbook for <br /> western washington. <br /> Site: 1113 / 1117 F Ave Date of test: June 24th 2018 <br /> Methodology <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 />