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FILE COPY <br /> ENGEO GEOTECHNICAL <br /> ENVIRONMENTAL <br /> WATER RESOURCES <br /> I N C O R P O R A I E D CONSTRUCTION SERVICES <br /> Project No. <br /> 5747.000.000 <br /> February 9,2011 <br /> Mr. Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> East Main Street <br /> Stockton, <br /> P <br /> Stockton, CA 95202 <br /> n �d� <br /> Subject: Assessor's Parcel Number 191-330-10 �j 2 <br /> San Joaquin County, California �l�0 <br /> PIEZOMETER INSTALLATION WORK PLANb I l� <br /> all <br /> Dear Mr. Inf nna: <br /> This Work Plan was developed in conjunction with the Department of Water Resources (DWR) <br /> and the Central Valley Flood Protection Board(CVFPB). <br /> PIEZOMETER LAYOUT <br /> We propose to install three piezometer arrays (three piezometers per array for a total of nine <br /> wells) perpendicular to the levee at approximately Stations 582+00, 584+00, and 586+00. The <br /> piezometers will be located as shown in the attached Piezometer Plan and summarized as <br /> follows: <br /> Landside of the seepage berm and trench drain 30 feet Below blanket layer <br /> Levee toe and waterside of trench drain 35 feet Below blanket layer <br /> Landside edge of the levee crown 45 Feet Levee Fill and Levee Foundation <br /> *Final screening intervals shall be based on the materials encountered in the borings. <br /> PIEZOMETER WELL CONSTRUCTION <br /> The landside and crown piezometers will be installed by conventional vertical well construction <br /> methods using hollow stem augers, as shown in the attached Typical Piezometer Installation <br /> Detail. At least 48 hours prior to drilling the borings, we will mark the site for an Underground <br /> Service Alert(USA)utilities check. <br /> Wells will be constructed of 2-inch-diameter PVC casing with manufactured screen. The well <br /> screen will be appropriate for the graded granular filter pack material that will be sized according <br /> to the aquifer material grain size distribution. We estimate that a 0.010-slot manufactured screen <br /> and a #2/12 filter pack will be appropriate for this project. At a minimum, the upper 5 feet of <br /> annular space will be filled with bentonite and cement grout sealed to ground surface to <br /> minimize the intrusion of surface water into the well, in general conformance with San Joaquin <br /> 580 N.Wilma Avenue,Suite A•Ripon,CA 95366•(209)835-0610•Fax(888)279-2698 <br /> www.engeo.com <br /> FILE COP Y <br />