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DDJC-oy OU 1 Pesticide Remediation Groundwater Extraction Well Installation Work Plan sections. A more complete discussion of the well • Reference elevation for all depth measure- construction procedures is presented in the ments; DDJC-Sharpe/Tracy Comprehensive Field Work Plan (URS,2001). • Name of driller; 2.0 WELL INSTALLATION • Name and signature of the field geologist ACTIVITIES preparing the log;and 2.1 Pre-Well Installation Activities • Name and signature of California registered geologist who provided oversight. Before any drilling or well installation activities are initiated, a well installation permit will be 2.2.2 The field geologist will record an as-built obtained from San Joaquin County Public diagram of each extraction well during the Health Services,Environmental Health Division, construction of the well. Furthermore,a detailed as well as clearance of all aboveground and log will be kept during the development of each below ground utility hazards. well. The type of information that will be included in the log is discussed in the DDJC- 2.2 Field Documentation Sharpe/Tracy Comprehensive Field Work Plan (URS, 2001). Results will be documented in the 2.2.1 The URS field geologist will maintain an forthcoming Comprehensive Engineering accurate log for each boring drilled. At a Technical Memorandum for TO 37. minimum, the log shall include: 2.3 Drilling Requirements • Name of the project and site; For the proposed extraction wells, an 8-to • Boring number; 9-inch diameter boring will initially be drilled with 4-1/4-inch internal diameter hollow-stem • Date drilled; augers to obtain a continuous core for lithologic logging. Upon completion of drilling and • Location of the boring; logging,the boring will then be reamed to 14 inches for the installation of the 6-inch- • Type of drill rig; diameter extraction well casing. • Size and type of drilling method used; 3.0 WELL SPECIFICATIONS • Depth at which groundwater was first The extraction wells will be installed using encountered; guidelines set forth in the DDJC-Sharpe/Tracy Comprehensive Field Work Plan (URS,2001). • Depth to the static water level and changes The well design specifications of the proposed in static water level with hole depth; extraction wells are provided in Table 3-1.A diagram of a typical extraction well design is • Total depth of the hole; shown in Figure 3-1. Figure 3-1 is intended to show the planned subsurface well construction • Depth or location of any problems details only; surface completion details are encountered(i.e., heaving sands); provided in the extraction well design summary in the DDJC-Tracy Site OU I Pesticide • Lithologies of soil layers encountered; Remedial Design 100%Submittal(URS,2002). All wells(i.e., headworks and valves)will be completed in concrete vaults with bolted lids. K902237\01) 1_Pest-RemVinal\GW-EW-WrkPln.dm 2 July 2002