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reCivil, <br /> Environmental <br /> . 8 Water <br /> Resources <br /> MEMORANDUM <br /> ENGINEERING CORP. <br /> TO: Kasey Foley,REHS <br /> Interim Director, San Joaquin Environmental Health Department <br /> FROM: Norman Hantzsche,PE, Questa Engineering Corporati <br /> r <br /> DATE: November 22, 2019 <br /> SUBJECT: Final -OWTS Design Review for Navu Farms,Inc., 7300 West Delta Ave,Tracy <br /> In my design review memorandum of November 13,2019,I noted that the OWTS design for the <br /> subject project proposed a 5-ft groundwater separation below the disposal field rather than 8-ft, <br /> as required by San Joaquin County OWTS regulations (Table 1.10.2). The response letter of <br /> November 20, 2019 from the designer(Don Chesney),argued against imposing the 8-ft <br /> separation standard on the basis that: (a)the clay loam soil conditions provide suitable texture <br /> and biological activity for treatment of bacteria and viruses and(b)due to the very small volume <br /> of wastewater discharge and oversized leachfield,there will be more than adequate time and <br /> space for soil absorption and treatment. <br /> I agree with the above rationale presented by the designer and believe it satisfies the footnote <br /> exception to the County percolation-groundwater separation criterion(Table 1.10.2)which <br /> allows for an alternative separation distance if"...mitigated by the system design or <br /> enhancement". <br /> 1 <br /> Box 70356, 1220 Brickyard Cove Rd.Suite 206 Pt. Richmond,CA 94807 T.•510/236.6114 F 510/236.2423 E.Questa®QuestaEC.com <br />