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GEOTECHNICAL <br /> ENGEO ENVIRONMENTAL <br /> WATER RESOURCES <br /> I N C O R P O R A T E D CONSTRUCTION SERVICES <br /> Project No. <br /> 9225.000.000 <br /> April 1, 2011 <br /> Mr. Michael Infurna <br /> Environmental Health Department, San Joaquin County <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Subject: 21930 Austin Road <br /> APN 228-090-08 <br /> Ripon,California <br /> WORK PLAN FOR GROUNDWATER LEVEL STUDY <br /> Dear Mr. Infurna: <br /> As requested by our client, Austin Road Partners, LLC, ENGEO has prepared this work plan for a <br /> groundwater level study of the subject property, located on the east side of Austin Road in <br /> unincorporated Ripon, California(Figures 1 and 2). We present this work plan to the San Joaquin <br /> County Environmental Health Department and request approval to perform the services <br /> described below. <br /> PROJECT DESCRIPTION AND SCOPE <br /> The first phase of the project will include an approximately 30-acre stormwater basin. To <br /> determine the approximate depth to groundwater and the design high groundwater elevation, we <br /> plan to perform the following scope of services. <br /> We will utilize the services of a licensed drilling contractor to install one groundwater <br /> piezometer to be located adjacent to the proposed basin for the purpose of monitoring <br /> groundwater elevations and depths to groundwater. Soil samples will be collected for field soil <br /> classification only. The piezometer will extend to a depth of approximately 30 feet below <br /> existing grade. At least 48 hours prior to drilling the boring, we will mark the site for an <br /> Underground Service Alert (USA) utilities check. The piezometer will be permitted, installed, <br /> and backfilled in accordance with San Joaquin County requirements. <br /> The piezometer will be screened between 10 and 30 feet below the ground surface (bgs). The <br /> screen and casing will consist of 2-inch-diameter slotted Schedule 40 PVC pipe. We will extend <br /> the well casing between 2 to 3 feet above the ground surface and install a steel standpipe to <br /> protect the well casing. A piezometer detail is provided on Figure 3 <br /> 580 N.Wilma Avenue,Suite A •Ripon,CA 95366•(209)835-0610•Fax(888)279-2698 <br /> www.engeo.com <br />