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GEOTECHNICAL <br /> ' NEIL O. ANDERSON ENVIRONMENTAL <br /> A N D A S S O C I A T E S INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> u u n <br /> �11 ��] �iENSION DESIGN <br /> July 25, 2006 ��� (' <br /> NCIA Project Number:E05141B JUL 2 6 2006 <br /> ENVIRONMENT HEA <br /> Greg Oliveira P�`RMlT LTN <br /> San Joaquin County Environmental Health Department ISEMOCES <br /> 304 E.Weber Avenue <br /> Stockton,CA 95212 <br /> Re: Terpstra Property -SSS <br /> Septic Permits, Groundwater Depth&Leach Lines and Pits <br /> Dear Graig, <br /> Per your request, the following information includes the updated septic permit information, <br /> groundwater depth and a modified recommendation for the septic system for the Terpstra property <br /> located at 26222 Mahon Road in Escalon. <br /> Ground Water Depth and Gradient <br /> The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground <br /> water depth and elevation maps were reviewed to determine the ground water levels near the Site. <br /> The Fall 1998 and Spring 1999 maps are the most current official maps available from the County. <br /> According to these maps (Plates 3-6),ground water lies between 60 and 70 feet below ground <br /> surface and flows at a gradient of about 10 feet per mile to the north-northeast in the vicinity of the <br /> Site. <br /> No ground water was encountered by the staff of Neil O. Anderson&Associates, Inc. during the <br /> drilling of a percolation test hole to a depth of 15.98 feet on November 1, 2005. <br /> On-Site Septic Permit History <br /> One septic system currently exists on the site. One septic repair permit was found on file for the <br /> address of 26222 Mahon Road, Escalon,California, at the San Joaquin County Environmental <br /> Health Department (EHD),on December 7, 2005. The septic permit is described below. The septic <br /> repair permit was issued to Nancy Van Weerdhuizen on December 15, 1999 for the installation of a <br /> 1,200 gallon septic tank with one,90 foot leach line and sumps. <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industdal Way,Lodi,California 95240 ■209.367.3701 0 209.369.4228 fax 0 w .noandenonxc <br />