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Civil, CnWronmental a Wntcr Resources MEMORANDUM EN21NEEK ING COU. TO: ICasey Foley,RFHS Interim Director,San Joaquin Environmental Ecalth Department FROM: Norman Hantzsche,PE,Questa Engineering Corporate G 1 r AAT& November 22,2019 SUBJECT:Final-OWTS Design Review for Navu Farms,Inc.,7300 West Delta Ave,Tracy In my design review memorandum of November 13,2019,I noted that the OWTS design for the subject project proposed a 5-ft groundwater separation below the disposal field rather than-8-ft, as required by-San Joaquin County OWTS regulations(Table 1.10.2).The response letter of November 20,2019 from the designer(Don Chesney),argued-against imposing the 8-ft separation standard on the basis that:(a)the clay loam soil conditions provide suitable texture and biological activity for treatment of bacteria and viruses and(b)due to the very small volume of wastewater discharge and oversized leachfield,there will be more than adequate time and space for soil absorption and treatment. I agree with the above rationale presented by the designer and believe it satisfies the footnote exception to the County percolation-groundwater separation criterion(Table 1.10.2)which allows for an alternative separation distance if"...mitigated by the system design or enhancement", ' 1 box 70356,1220 Brickyard Cove Rd,Suitc los Pt.Riehmmd,CA 84807 K''510/236.6114 f:510J236.2423 F:QuesnoolJuestaECcom Planning Commission Staff Report, PA-1800316(UP) 44 Environmental Review