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1 <br /> I <br /> GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> AN D ASSOCIATES,.404 1 INSPECTIONS ars TESTING <br /> LAS-ORATORY SERVICES <br /> I <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> July 2, 2007 <br /> NOA Project Number: E06122A <br /> Mike Smith Engineering, Inc. <br /> 4 North Main Street <br /> Lodi, California 95241 <br /> Subject: Engineered Septic System Design and Layout <br /> Calloway Court Property <br /> 4065 & 4080 Calloway Court <br /> Stockton, California <br /> Dear Mike, <br /> Per your request, our office has provided recommendations for an engineered septic system <br /> design to serve the proposed Calloway Court commercial buildings. The park is located at 4065 <br /> & 4080 Calloway Court, Stockton, California. This letter and the attached drawing provide the <br /> design details for the engineered septic system. A separate letter will follow with an estimate for <br /> the construction inspection and monitoring costs. The design includes features to reduce the <br /> potential build-up of nitrates from the on-site septic system into the ground. <br /> Scope of Work <br /> The scope of work included a review of the SS/NLS report(NOA, 2007), discussions with the <br /> San Joaquin County Environmental Health Department(EHD) staff, review of several technical <br /> articles, and the complete layout, design, and calculations for a septic system. The scope of work <br /> does not include any additional permit fees or report review fees required by the EHD. <br /> General <br /> Based on several discussions with EHD staff, it was discussed that existing engineered septic <br /> systems under permit in San Joaquin County do not reliably achieve nitrate levels below 10 <br /> mg/L-N from the outflow of the system. Often,they exceed these goals. Additional nitrate <br /> reduction is thought to occur within the leach field, however; it is difficult to measure. <br /> The EHD has agreed to a proposal to permit and participate in an evaluation for an alternative <br /> design which utilizes aerobic and anaerobic processes contained within the trench similar to all <br /> int,„rmediate sand filter system. This approach was described in an article published in <br /> Environmental Technology (Marselille and Anderson, 2001). The design has the benifit of lower <br /> .ODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902lndustriai Way,Lodi,California 95240 ■209.367.3701 ■ 209.369.4228 ■www-noanderson.com <br /> �R� OS1 � <br />