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1 <br /> September 17, 1993 <br /> Skobrak Property, Stockton, California <br /> lead, since previous analyses for this analyte were below laboratory detection limits A State- <br /> certified laboratory will perform the analysts <br /> 4.1.3 Monitoring Well Construction <br />' Proposed monitoring wells will be constructed of two inch diameter F480 threaded PVC <br /> screen/casing No glues or solvents will be used Screen slot size will be 0 010 inch Sand <br />' pack material will be #2 pre-washed silica-sand A minimum two foot bentonite seal will be <br /> placed above the sand pack prior to grouting to the surface with neat cement grout Well <br /> completion depth is based on the setting of the well screen 15 feet below and five feet above the <br /> saturated zone This construction will allow for groundwater fluctuations Actual completion <br /> depths will be determined in the field based on hydrogeologic conditions encountered Typical <br /> monitoring well completion will be as shown on Figure 4 <br /> 4.1.4 Monitoring Well Development <br /> Following installation, each monitoring well will be developed using pumping and swab and bail <br />' techniques The wells will be developed until they are relatively sediment free <br />' 4.1.5 Wellhead Survey <br /> Wellhead elevations and locations will be surveyed to allow lateral and vertical control for data <br />' reduction Surveying will be performed under the direction of a registered engineer or surveyor <br />' 4.1.6 Fluid Level Measurement <br /> Water levels will be obtained from all monitoring wells following development and after water <br />' levels have been allowed to stabilize Levels will be measured using an electronic water probe <br /> capable of differentiating between air and water with an accuracy of 11100th of a foot <br /> WP 0993 DRI' 5 <br /> I <br />