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RECEIVED <br /> JUN 19 2020 <br /> RNVIRONMENTAL HEALTH <br /> DEPARTMENT <br /> June 19, 2020 <br /> FOR: San Joaquin County Environmental Health Department(EHD) <br /> Mr. Michael Kith, REHS <br /> Mr. Aaron Gooderham, EHS <br /> 1868 Hazelton Ave. <br /> Stockton,CA 95205 <br /> PROJECT: Michael and Deana Thornton Project <br /> SR0082092 <br /> 7095 East Sedan Ave. <br /> Manteca, California 95337 <br /> SUBJECT: Plan Check: Engineered Filter Bed <br /> Reference is made to the Service Request Number(SR)for the Thornton Project, indicated above. Onsite <br /> Wastewater Treatment System(OWTS)Plans for this project were submitted to mitigate the nitrate loading <br /> that is anticipated to originate from the proposed single family residence. This loading determination was <br /> made based on my Soil Suitability and Nitrate Loading Studies completed for this project. <br /> The Plans illustrate an innovative process to mitigate the nitrate loading through vegetative uptake. <br /> Infiltrator® EZFlow® engineered geosynthetic aggregate modules will be installed in a conventionally <br /> excavated filter bed,with the orientation illustrated in the Plan View diagram. The modules will be installed <br /> 1.5 ft apart with excavated soil backfilled in-between the modules. This will allow the root structures of the <br /> Fescue grass to maintain vigor and grow around and under these modules to immediately uptake and <br /> metabolically utilize the ammonium,which composes approximately 80% of the OWTS effluent. This is <br /> illustrated in the Filter Bed End-View diagram. Ammonium nitrogen uptake through the roots will occur <br /> under the three processes of mass flow,diffusion and root interception. <br /> The NOTES section found on the Plans details the construction process for the installation of the components <br /> to achieve the desired effect of reducing nitrate loading by at least 50%. As noted, detailed reporting and <br /> calculations on this process can be found in the Studies completed for this project. <br /> Respectfully submitted, ?tofessio, <br /> �. Ch <br /> te <br /> CHESNEY CONSULTING � <br /> 00 <br /> s <br /> rate Civil <br /> 0 <br /> Don Chesney, PE/CCA Of Cali O <br /> Registered Civil Engin r#C75479 <br /> Certified Crop Advisor/Registered Nitrogen Management Specialist#341829 <br /> P.O.Box 3794 ❑ Turlock,CA 95381 ❑ 209.402.1652 ❑ ddchesngy(@charter.net <br />