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CONCLUSIONS <br />The nitrate loading calculations indicate the average concentration of nitrate -nitrogen in effluent recharge <br />water will be under the MCL drinking water standard of 10 mg/L N. <br />The 2,000 gallon septic tank to be installed should be pumped on a regular basis of approximately every <br />three years. Additionally, an effluent filter such as the Polylok® PL -122 should be installed at the tank <br />outlet to lower BOD and TSS concentrations and prevent particulate matter from entering the filter bed <br />soil. The filter should be cleaned when the tank is pumped. <br />As referenced, the EHD is requiring documentation illustrating there is sufficient primary and 100% <br />replacement effluent disposal areas to serve both the primary residence and the ADU. As noted on the <br />attached Google Maps Aerial photo, the area adjacent,to the east of the ADU illustrates a dedicated filter <br />bed disposal area of 4,646 sf. The required disposal area for this location is: <br />800 sf (100 LFLL x 2 bedrooms = 200 x 4 Soil Factor = 800 sf.) <br />800 sf + 290 Sf (separation area between primary and replacement) + 800 sf =1,890 sf required. <br />The primary residence requires a filter bed replacement area of 1,600 sf. <br />4,646 sf - 1,890 sf (ADU) = 2,756 sf remaining. Therefore, there is sufficient area (2,756 sf - 1,600 sf = <br />1,156 excess sf) in this location to serve as replacement area for the primary residence, although the <br />effluent may have to be pumped to this location upon failure. <br />The onsite domestic well is located 135 ft to the northwest from this proposed disposal area. The domestic <br />well for the property to the south is 200 ft from the SWC of the proposed disposal area. No development <br />as occurred on the property to the east of the subject Parcel. <br />Page 4 of 7 <br />Chesney Consulting <br />