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+ • DDJC-Tracy Groundwater Monitorowell Installation Work Plan <br /> 1.0 INTRODUCTION in Sections 2.0, 3.0,4.0, and 5.0.A more <br /> complete discussion of the well construction <br /> 1.1 The purpose of this work plan is to describe procedures is presented in the DDJC-Sharpe/ <br /> a groundwater monitoring well installation Tracy Comprehensive Field Work Plan(URS, <br /> effort to be conducted north of the Defense 2001). The well installation is tentatively <br /> Distribution Depot San Joaquin California— scheduled for December 2003 depending on the <br /> Tracy Site(DDJC-Tracy)on the DDJC-Tracy acquisition of a county well installation permit. <br /> Annex. One monitoring well will be installed as Costs associated with this field effort are <br /> part of DDJC's ongoing groundwater remedia- consistent with those presented in the Task <br /> tion efforts to provide effective monitoring of Order 06 budget estimates. <br /> the groundwater plumes. Figure I-1 shows the <br /> location of the proposed monitoring well <br /> (PMW-1). 2.0 WELL INSTALLATION <br /> ACTIVITIES <br /> 1.2 The DDRW-Tracy Well Monitoring <br /> Program, 1995 Annual Well Monitoring Report 2.1 Pre-Well Installation Activities <br /> (Radian Corporation, 1996)recommended that a <br /> new monitoring well be installed on the DDJC- Before any drilling is initiated, a well installa- <br /> Tracy Annex in the vicinity of LM066A, tion permit will be obtained from San Joaquin <br /> LM067B,and LM08IC to monitor trichloro- County Environmental Health Department,as <br /> ethene (TCE)migration in the Lower Horizon well as clearance of above and below ground <br /> downgradient from EW030C.The new well will utility hazards at the proposed monitoring well <br /> be installed within 100 feet of LM081C,and location. <br /> screened across the sandy interval in the Below <br /> Lower Horizon(approximately 170 to 190 feet 2.2 Field Documentation <br /> below ground surface [bgs]). Installation of this <br /> well has been delayed because funds that would 2.2.1 The URS field geologist will maintain an <br /> have been used for its installation were used accurate log for the boring. At a minimum,the <br /> instead for extraction well installation(URS, log shall include: <br /> 2003). <br /> • Name of the project and site; <br /> 1.3 The location of PMW-I is shown on Figure <br /> 1-1. The well design specifications for PMW-1 • Boring number; <br /> are provided in Table 1-1.A diagram of a <br /> typical well design is shown on Figure 1-2. • Dates drilled; <br /> Planned well installation activities are discussed <br /> Table 1-1. Estimated Well Specifications, PMW-1 Well Installation, DDJC Tracy* <br /> Estimated Estimated Estimated <br /> Depth Casing Casing Well Slot Length of <br /> Well (ft bgs) Diameter Material Screen Material Size Well Screen <br /> PMW 1 190 4-inch SCH 40 PVC SCH 40 PVC 0.010 inch 10 feet <br /> ' Well specifications are dependent upon the lithology encountered during drilling. <br /> ft bgs = below ground surface <br /> MW = monitoring well <br /> PVC = polyvinyl chloride <br /> SCH = Schedule <br /> KAWprocess\00353\Tracy\GW MW Install Wntext.doc I November 2003 <br />