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�-- LIVE OAK GEO ENVIRONMENTAL, INC. <br /> 407 W. Oak St., Lodi, CA 95240 ❖ (209)369-0375 ❖ logelodi.com <br /> June 19, 2019 RECEIVED <br /> Project Number: 1928 <br /> Linda Turkatte, Director JUN 2 1 2019 <br /> San Joaquin County Environmental Health Department ENVIRONMENTAL HEALTH <br /> 1868 E. Hazelton Ave. DEPARTMENT <br /> Stockton, CA 95205 <br /> Regarding: Discussion of Previous Nitrate Loading Study <br /> And Current Use Numbers <br /> American Crane Rental, Inc. <br /> 17800 S. Comconex Rd., Manteca, CA <br /> Ms. Turkatte: <br /> American Crane Rental, Inc. proposes to construct a new 14,400 square foot building <br /> for enclosed equipment storage. It is the understanding of Keith Powell of American <br /> Crane that the Environmental Health Department may request a Soil Suitability/Nitrate <br /> Loading Study to address the construction of the new building. ' <br /> At the request of Mr. Powell, we have reviewed a Nitrate Loading Study/Soil Suitability <br /> Study prepared for the American Crane facility by Don Chesney at Provost & Pritchard <br /> Consulting Group in 2012. The purpose of this letter is to consider the values and <br /> assumptions utilized in that report in light of the typical values used by our office, as <br /> well as the current methodology recommended by the San Joaquin County <br /> Environmental Health Department. We will also evaluate the current proposed project <br /> at the American Crane facility by using the current methodology. <br /> Both Provost & Pritchard and Live Oak GeoEnvironmental use the the Hantzsche and <br /> Finnemore equation (1992) for calculating nitrate loading. The Hantzsche and <br /> Finnemore equation is a conservative approximation of ground-water nitrate-nitrogen <br /> concentration resulting from the combined effect of on-site sewage disposal systems <br /> and percolating recharge waters. The method takes into account the development <br /> area, soil denitrification factor, rate of recharge from percolating waters, waste effluent <br /> quantity, and waste effluent nitrate concentration from on-site septic systems, and <br /> predicts the nitrate concentration of percolating effluent. <br /> Environmental Engineering Geology 4• Geophysics <br />