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., LIVE OAK GEO ENVIRONMENTAL, INC. <br /> 407 W. Oak St., Lodi, CA 95240 4• (209) 369-0375 :• logelodi.com <br /> August 6, 2020 RECEIVED <br /> Project Number: 20-24 <br /> AUG 0 6 2020 <br /> Michael Kith, REHS, Program Coordinator <br /> ENVIRONMENTAL HEALTH <br /> San Joaquin County Environmental Health Department DEPARTMENT <br /> 1868 E. Hazelton Ave. <br /> Stockton, CA 95205 <br /> Regarding: Addendum to Soil Suitability/Nitrate Loading Study <br /> Murray Trailers <br /> 1754 Mariposa Rd., Stockton, CA <br /> Original report dated July 8, 2020 <br /> Mr. Kith: <br /> We received your letter dated July 22, 2020 regarding the above study. In the letter, you <br /> request that we recalculate the nitrate loading for the proposed project to include `only the <br /> acreage of the parcel that the proposed project and OWTS will be situated on to estimate the <br /> long term nitrate loading impact." <br /> We discussed by phone on August 4 that the project acreage has been modified by a Lot Line <br /> Adjustment, PA-1900184. Taking this into account, the total relevant area of the project is 7.787 <br /> acres, which includes parcels 173-040-03, 173-040-04, and a portion of 173-040-76. <br /> Our revised nitrate loading calculation follows. All variables are unchanged from the original <br /> report except the Site area and uniform wastewater loading (calculated). This change affects <br /> pages 14 (entire page) and 15 (fifth paragraph) of the report: <br /> Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> 0 285 gpd Effluent flow rate <br /> Nw 85 mg/L-N Effluent stream concentration <br /> A 7.787 acres Site area <br /> Nb 0.30 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> R 4.04 inches per year Recharge rate of rainfall <br /> W 0.5 inches per year Uniform waste water loading (calculated) <br /> Environmental •. Engineering Geology . Geophysics <br />