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r. <br /> LIVE OAK GEO ENVIRONMENTAL, INC. <br /> 407 W. Oak St., Lodi, CA 95240 :• (209) 369-0375 :- logelodi.com <br /> W t <br /> July 6, 2020 RECEIVED <br /> Project Number: 20-22 <br /> Michael Kith, Lead REHS <br /> JUL 0 2020 <br /> San Joaquin County Environmental Health Department ENVIHUNMI=N IAL HEALTH <br /> 1868 E. Hazelton Ave. DEPARTMENT <br /> Stockton, CA 95205 <br /> Regarding: Addendum to Soil Suitability/Nitrate Loading Study <br /> Affonso Property <br /> 1424 S. Jack Tone Rd., Stockton, CA <br /> Original report dated June 11, 2020 <br /> Mr. Kith: <br /> We were contacted today by Kim Affonso regarding the above Soil Suitability/Nitrate Loading <br /> Study (SSNLS). Ms. Affonso indicated that the proposed second unit dwelling will have three <br /> bedrooms; the SSNLS included only two bedrooms. The report was approved in your letter <br /> dated June 29, 2020. <br /> Based on our conversation with Ms. Affonso, we have re-calculated the nitrate loading to include <br /> three bedrooms in the second unit dwelling. The revised sections of the report are as follows, <br /> with corrections in bold italics; all other portions of the report and calculation remain <br /> unchanged: <br /> QuamtRy and Duality of Domestic Wastewater (page 10 of report) <br /> Ms. Affonso indicated that the existing shop on the Site will be renovated to include a three- <br /> bedroom second unit dwelling. A three bedroom home is also located on the Site. <br /> Crites and Tchobanoglous (1998) list a typical flow rate of 50 to 70 gallons per person per day <br /> for an individual residence. In the past, San Joaquin County Environmental Health Department <br /> has requested that the flow rate be calculated as 140 gallons per bedroom per day to reflect <br /> maximum usage. On March 4, 2020, however, Michael Kith, Lead Registered Environmental <br /> Health Specialist at the San Joaquin County Environmental Health Department, stated that he <br /> has conferred with Norman Hantzsche (author of the 1992 paper discussed previously), and <br /> they have arrived at a new method to determine flow from residential sources. He indicated that <br /> wastewater flow from a single-family residence should be calculated as 100 gallons per day <br /> (gpd) for the first bedroom and 50 gpd for each additional bedroom; additional residences <br /> should be calculated in the same manner (personal communication, March 4, 2020). <br /> Using this method, the existing three-bedroom house would contribute 200 gpd, and the <br /> proposed three-bedroom house would contribute 200 gpd, for a total wastewater flow rate of <br /> 400 gpd. <br /> Environmental Engineering Geology : Geophysics <br />