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AdvancedGeo <br /> An Employee-Owned Company <br /> 18 January 2021 RECEIVED <br /> Project No. 05-1278 <br /> JAN 18 2021 <br /> ENVIRONMENTAL HEALTH <br /> Mr. Naseem Ahmed DEPARTMENT <br /> San Joaquin County Environmental Health Department <br /> 1868 E Hazelton Ave, Stockton, CA 95205 <br /> Email: nahmed(cD_sigov.org <br /> Subject: Addendum to Soil Suitability and Nitrate Loading Study <br /> THREE B'S TRUCK AND AUTO PLAZA <br /> 14749 Thornton Road/Pennant Drive, Lodi, California <br /> Dear Mr. Ahmed: <br /> At the request of Three B'S Truck and Auto Plaza, AdvancedGeo, Inc. (AGI) has prepared <br /> this Addendum to Soil Suitability and Nitrate Loading Study for the property located at <br /> 14749 Thornton Road/Pennant Drive, Lodi, California (site). This Addendum was <br /> prepared to provide a revised nitrogen loading rate as requested in San Joaquin County <br /> Environmental Health Department (EHD) letter dated 07 January 2021. <br /> The future site usage includes similar usage as the existing site usage. There are six (6) <br /> existing toilets, and the site is being improved with three additional toilets and two <br /> showers. Utilizing the San Joaquin County Onsite Wastewater Treatment System <br /> Standards, the average and reasonable usage of 150 gallons per day (gpd) per toilet is <br /> typical for the site setting (retails markets with public toilets). The average and reasonable <br /> maximum usage of wastewater for the toilets at the subject property is 150 gpd per toilet, <br /> for a total of 1,350 gpd. The average and reasonable maximum usage of wastewater for <br /> the showers is 20 gpd per customer/person. Using an average of 30 customers per day <br /> equals 600 gpd of total wastewater use for the showers. <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 /> • Commercial volume 1,350 + 600 = 1,950 gpd. <br /> • Commercial concentration 85 mg/1-N (EHD standard). <br /> • The flow concentration of 165,750 mg/1-N gallon. <br /> 837 Shaw Road • Stockton, CA 95215 <br /> Telephone (800) 511-9300 • Fax (888) 445-8786 <br />