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LIVE OAK GEO ENVIRONMENTAL, INC. <br /> 407 W. Oak St., Lodi, CA 95240 :• (209) 369-0375 :- logelodi.com <br /> February 11, 2020 RECEIVED 4q <br /> Project Number: 2106c <br /> Steven Shih, Sr. REHS FEB 12 2021 <br /> San Joaquin County Environmental Health DepaRM69NMENTAL HEALTH <br /> 1868 E. Hazelton Ave. DEPARTMENT <br /> Stockton, CA 95205 <br /> Regarding: Second Addendum to Soil Suitability/Nitrate Loading Study <br /> 25795 S. Bird Rd., Tracy, CA <br /> Report dated February 4, 2021 <br /> Mr. Shih: <br /> Per the request of Gabriel Ruvalcaba, Live Oak GeoEnviron mental, Inc. (Live Oak) has <br /> prepared this revision to the calculation included in the above Nitrate Loading Study. <br /> Mr. Ruvalcaba is purchasing the Site and is considering placing only one three- <br /> bedroom or two-bedroom house on the Site. <br /> We have also received test results from rainwater sampling we conducted in January, <br /> the use of which will slightly reduce the predicted nitrate loading for the project. <br /> Nitrate Loading Calculation <br /> As discussed in the Nitrate Loading Study, a three-bedroom house would result in an <br /> estimated daily flow of 200 gallons per day (gpd). A two-bedroom house would result <br /> in an estimated daily flow of 150 gpd. <br /> Rainwater Testing Results <br /> Hantzsche and Finnemore listed 1 mg/L-N as the nitrate concentration of rainwater for <br /> their original calculation; in the past, Live Oak has also utilized this value for the nitrate <br /> loading calculation. <br /> To determine a more accurate local value, Live Oak has collected rainwater during <br /> several recent storm events in Lodi. Each sample was collected in a clean, dry, <br /> stainless steel bowl, then decanted into a plastic container and placed on ice for <br /> transport. The samples were analyzed for nitrate by FGL Environmental of Stockton. <br /> The results of the rainwater sampling are as follows: <br /> Environmental Engineering Geology Geophysics <br />