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` _ • DDJC-Sharpe EWCC3 10 ometer Installation Work Plan <br /> 1.0 INTRODUCTION 2.0 PIEZOMETER INSTALLATION <br /> ACTIVITIES <br /> 1.1 The purpose of this work plan is to describe <br /> a groundwater piezometer installation effort to 2.1 pre-Piezometer Installation <br /> be conducted west of Defense Distribution Activities <br /> Depot San Joaquin California(DDJC)-Sharpe. <br /> Three permanent piezometers (proposed Before any drilling is initiated, a county drilling <br /> piezometer[PPZ] 1 through PPZ 3) are planned permit shall be secured,as well as clearancc of <br /> as part of DDJC's ongoing groundwater above and below ground utility hazards at a 1 of <br /> remediation efforts to provide effective the locations. <br /> monitoring and extraction of the groundwater <br /> plumes. Figure 1-1 shows the locations of the 2,2 Field Documentation <br /> three proposed piezometers. The piezometers are <br /> to be located approximately 100 to 300 feet from 2.2.1 The URS field geologist will maintai i an <br /> existing groundwater extraction well (EW)CC3, accurate log for all the borings. At a tninim am, <br /> and will be within public rights-of-way (i.e., the log shall include: <br /> City of Lathrop streets), which will require an <br /> encroachment permit from the city. Each of the • Name of the project and site; <br /> three proposed locations will include a set of <br /> three "nested"piezometers installed at different • Boring number; <br /> horizons(i.e., a total of nine piezometers are to <br /> be installed). • Dates drilled; <br /> 1.2 The three piezometer nests were recom- . Location of the boring; <br /> mended in the URS memorandum Recommenda- <br /> tion for Monitoring Well Cluster and • Type of drill rig; <br /> Piezometers West of DDJC-Sharpe(URS, <br /> 2001a)to monitor the hydraulic influence of the • Size and type of drilling method used; <br /> existing extraction well EWCC3 located to the <br /> west of the Central Area and to monitor the . Depth at which groundwater was first <br /> water quality for tracking the movement of the encountered; <br /> trichloroethene (TCE)plume west of DDJC- <br /> Sharpe. The three horizons in which the • Depth to the static water level and chan res <br /> piezometers will be installed include the interval in static water level with hole depth; <br /> screened in EWCC3 (117 to 137 feet below <br /> ground surface [bgs]), in addition to sandy zones • Total depth of the hole; <br /> above and below this interval. <br /> • Depth or location of any problems <br /> 1.3 The three piezometer nests have been tenta- encountered (e.g.,heaving sands); <br /> tively scheduled for installation in September <br /> 2002,depending on the acquisition of an . Lithologies of soil layers encountered; <br /> encroachment permit from the City of Lathrop <br /> and a county well installation permit. This work • Reference elevation for all depth <br /> plan describes the effort to install the three measurements; <br /> piezometer nests. A more complete discussion of <br /> well/piezometer construction procedures is • Boring abandonment procedures(if <br /> presented in the DDJC-Sharpe/Tracy Compre- applicable); <br /> hensive Field Work Plan(URS, 2001b). <br /> • Name of driller; <br /> K:\12200\Sharpe\EW CC3 Piez WP\EWCC3 WP.doe 1 Jul 2002 <br />