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GEOTECHNICAL ENGINEERING <br /> TESTING AND INSPECTION SERVICES <br /> NEIL O. ANDERSON CERTIFIED LABORATORIES <br /> ENVIRONMENTAL SERVICES <br /> A N D A S S O C I A T E S FOUNDATION ENGINEERING <br /> AQUATIC DESIGN AND ENGINEERING <br /> RENEWABLE ENERGY RESOURCES <br /> December 7, 2012 <br /> Email: couragee25@gmail.com <br /> Project Number: LGS120007 <br /> Mrs. Maria Couragee <br /> 11253 N. Thornton Road <br /> Stockton, CA 95209-4201 <br /> (209) 423-9356 <br /> Subject: Nitrate Loading Study/Soil Suitability Study—Addendum #1 <br /> Pharbuddhivongsamunee Buddhist Temple APN 055-200-03 <br /> 11253 North Thorton Road <br /> Stockton, California 95209 <br /> Dear Mrs, Couragee: <br /> This letter report addendum has been written to update the nitrate loading and soil <br /> suitability study originally performed by our firm (2006) for the subject property. We <br /> understand the proposed septic usage will increase by an additional 40 people for <br /> religious events. Per conversation with Rodney Estrada at the San Joaquin County <br /> Environmental Health Department (EHD), we know that the current septic system <br /> consists of two 1200 gallons tanks linked to each other with a corresponding 1200 <br /> square foot leach field (30 X 40 feet). <br /> In 2006, a water sample was analyzed for nitrate and DBCP. Nitrate was found at 161 <br /> mg/L-NO3, which is well above the maximum contaminant level (MCL) set by the US <br /> EPA of 45 mg/L-NO3. DBCP was not detected in the well water sample. Our original <br /> report showed that the system was to be used residentially for 7 people per day and <br /> commercially for 80 people per day. This resulted In 730 gallons per day of usage with <br /> a weighted average for nitrate concentration equaling 56.50 mg/L-N. Over the long <br /> term, this would ultimately cause build up of nitrate in the groundwater above 10.8 <br /> mg/L-N. <br /> The commercial increase for an additional 40 people into the system would cause a <br /> total increase of 120 gallons per day of effluent Into the current septic system. This is <br /> based on 3 gallons per day per person (80 existing and 40 proposed new people, <br /> totaling 120 people) and 70 gallons per day per resident (7 residents), for a total of 850 <br /> gallons. Evaluation of the system shows that the field is sized for 850 gallons per day <br /> (Plate 1). Therefore, the field is sized appropriately for flow based volume. <br /> Lodi Sacramento • Concord <br /> Phone:209.367.3701 • Fax:209.333.8303 • nrmv.noanderson.com <br /> 902.Industrial Way,Lodi,CA 95240 <br />