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AdvancedGeo <br /> An Employee-Owned Company <br /> 01 November 2021 <br /> Project No. 21-6435 <br /> Mr. Jeff Wong <br /> San Joaquin County Environmental Health Department <br /> 1868 E Hazelton Ave, Stockton, CA 95205 <br /> Email: jwong(a�slgov.org <br /> Subject: Addendum to Soil Suitability and Nitrate Loading Study <br /> FENG PROPERTY <br /> 26201 Thornton Road, Thornton, California <br /> Dear Mr. Wong: <br /> AdvancedGeo, Inc. (AGI) has prepared this Addendum to Soil Suitability and Nitrate <br /> Loading Study for the property located at 26201 Thornton Road, Thornton, California (site <br /> or subject property). This Addendum was prepared to provide a revised nitrogen loading <br /> rate as requested in San Joaquin County Environmental Health Department (EHD) letter <br /> dated 29 October 2021. <br /> The property is currently being used for commercial and residential purposes. The <br /> property is developed with a total of five buildings. The current large commercial building <br /> was erected on the property prior to the early 1990s. Prior use of the buildings consisted <br /> of a 1 ,700 square feet restaurant space, 1,300 square feet bar space, 600 square feet <br /> retail space, and three rented homes. The proposed use of the large commercial building <br /> is for a research facility. The 600 square feet retail building is vacant, and the three <br /> residential homes will be vacated and no longer used for residential purposes once the <br /> research facility is operational. <br /> The future site usage includes the addition of the research facility with a maximum of <br /> six (6) full-time employees. The research facility will operate from 9,00am to 5:00pm <br /> Monday through Friday, and the septic system will be utilized 260 days a year. The <br /> reasonable or maximum usage of wastewater for the research facility is 20 gpd per person <br /> or 120 gpd (6 employees). <br /> The total nitrate-nitrogen (NO3_N) average concentrations in commercial waste is <br /> 85 mg/1-N. <br /> The weighted average calculation for total nitrogen concentrations for onsite commercial <br /> flow is proposed as the following: <br /> 837 Shaw Road • Stockton, CA 95215 <br /> Telephone (800) 511-9300 • Fax (888) 445-8786 <br />