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ENGEOTECHNICAL <br /> GEO <br /> ENVIRONMENTAL <br /> WATER RESOURCES <br /> I N C O R P O R A T E D CONSTRUCTION SERVICES <br /> Project No. <br /> 5044.5.001.01 <br /> July 5, 2006 <br /> Ms. Margaret Lagorio <br /> Environmental Health Department, San Joaquin County <br /> 304 East Weber Avenue <br /> Stockton, CA 95202-2708 <br /> Subject: Monitoring Well Abandonment <br /> 301 W. Stewart Road <br /> APN 213-310-01O°� 3°Z <br /> Lathrop, California <br /> WORK PLAN FOR MONITORING WELL ABANBANDONMENT <br /> Dear Ms. Lagorio: <br /> As requested by our client, River Islands, ENGEO Incorporated has prepared this work plan for a <br /> monitoring well abandonment at the subject property, located in Lathrop, California(Figure 1). We <br /> present this work plan to the San Joaquin County Environmental Health Department and request <br /> approval to perform the services described below. <br /> The purpose of our services is to abandon an existing onsite well located in the eastern portion of <br /> the River Islands project,west of the toe of the San Joaquin River levee. Grading in the area of the <br /> monitoring well is planned for later this year. <br /> PROJECT DESCRIPTION <br /> The well to be abandoned is located approximately 2200 feet northeast the intersection of <br /> Stewart Road and Cohen Road near the toe of the San Joaquin River levee. The subject <br /> monitoring well is located in Assessor's Parcel Number APN 213-310-01. Based on information <br /> provided to us by the Environmental Health Department of San Joaquin County, the well was <br /> installed under permit in 1998. The well casing is 1-inch diameter PVC and the screen interval is <br /> unknown. A site visit and reconnaissance found that the well bottom is set at approximately 25 <br /> feet below the existing ground surface (bgs). The water level at the time of our exploration was <br /> measured at approximately 5 feet bgs. The top of the well is protected by a metal standpipe and <br /> is encased in concrete at the ground surface. <br /> It is our understanding that groundwater in the immediate vicinity of the site has no known <br /> contamination. <br /> 2880 North Tracy Boulevard•Suite 3•Tracy,CA 95376•(209)835-0610•Fax(209)835-0675 <br /> w .engeo.com <br />