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LIVE OAK GEO ENVIRONMENTAL, INC. <br /> 4*� 407 W. Oak St., Lodi, CA 95240 •: (209)369-0375 ❖ logelodi.com <br /> April 17, 2020 <br /> Project Number: 1832b <br /> Naseem Ahmed, REHS <br /> San Joaquin County Environmental Health Department <br /> 1868 E. Hazelton Ave. <br /> Stockton, CA 95205 <br /> Regarding: Addendum to Nitrate Loading Study <br /> De Casas Property <br /> 4338 N. Homer St., Stockton, CA <br /> Original report dated June 13, 2018 <br /> Mr. Ahmed: <br /> In response to the letter from your office dated April 7, 2020, we have prepared this <br /> addendum to the above Nitrate Loading Study. Based on discussions with your office <br /> in March 2019 and March 2020, the San Joaquin County Environmental Health <br /> Department's recommendations for nitrate loading studies have changed significantly <br /> since the original date of the report. <br /> Based on current San Joaquin County Environmental Health Department policy <br /> (personal communication, March 18, 2019), the recharge input for the Hantzsche and <br /> Finnemore equation should be derived from average monthly precipitation of rainfall and <br /> evapotranspiration rates for the area; the data should be obtained from the California <br /> Irrigation Management Information System (CIMIS), preferably from stations located <br /> within San Joaquin County. <br /> On March 4, 2020, Michael Kith, Lead Registered Environmental Health Specialist at <br /> the San Joaquin County Environmental Health Department indicated that that agency, <br /> in consultation with Norman Hantzsche (author of the original paper), now <br /> recommends that residential wastewater generation per house be calculated as 100 <br /> gallons per day (gpd) for the first bedroom and 50 gpd for each additional bedroom. <br /> Additionally, since the date of the original report, Live Oak has sampled local rainwater <br /> for nitrate; that information has been included in the new calculation as well. <br /> Environmental Engineering Geology : Geophysics <br />