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DDJC*y OU 1 Pesticide Remediation Groundwater Extraction Well Installation Work Plan 5.3 Groundwater Sample 6.1.2 The observation piezometers will be Collection placed at distances of approximately 32 and 65 feet to the east and west of PEW-I and PEW-2. Water samples will be collected from the The three Upper Horizon piezometers will be extraction wells as part of the annual monitoring installed adjacent to three of the seven Above program. Samples will be collected and analyzed Upper Horizon piezometers (see Figure 1-1). for volatile organic compounds by U.S. EPA The piezometers will be aligned parallel to the Method SW8260B, organochlorine pesticides by east-west access road to the immediate north of U.S.EPA Method SW8081A, and carbamate PEW-1 and PEW-2. This alignment was selected and urea pesticides by U.S. EPA Method 8321A. to evaluate the widths of potential capture zones Sample collection will be performed in accord- for each well at the test-pumping rate. Final ance with procedures outlined in the DDJC- piezometer placement and distances will be Sharpe/Tracy Comprehensive Field Work Plan determined by field conditions. (URS, 2001). 6.1.3 A CPT drill rig will be used to construct 5.4 Data Management 1-inch inside diameter piezometers with the materials described in the following paragraphs. 5.4.1 All data collected from location surveying and groundwater sample analytical results 6.1.4 The piezometer casing will be 1-inch collected under TO 37 will be incorporated into inside diameter Schedule 40 PVC pipe with the DDJC-Sharpe/Tracy Environmental Data flush threads. The casing surface will be free of Management System(EDMS)database. Data solvents,oils,grease,paint, and dirt and will be receipt, data loading, and the data quality control certified clean from the factory or steam-cleaned will be performed under TO 49. on site prior to installation. Sections of casing will be received from the supplier wrapped in 5.4.2 Electronic versions of all documents(i.e., polyethylene protective wrappers with sealed CD-ROMs) will be prepared and submitted ends to limit exposure to potential contaminants. according to the procedures described in the Casing will not be removed from the wrapping Electronic Document Submittals (#RD-ST-002) until immediately before it is to be placed in the for the DDJC-Sharpe/Tracy program. boring. 6.0 TEMPORARY PIEZOMETER 6.1.5 Each piezometer screen will consist of a INSTALLATION ACTIVITIES 1-inch nominal diameter, Schedule 40 PVC continuous slot screen with flush threads. The 6.1 Temporary Piezometer precise screen depth and slot size will be Installation determined in the field based on the lithology encountered and the results of the CPT 6.1.1 Ten temporary observation piezometer dissipation tests.The screen will be of sufficient wells(TPZ1 through TPZ10, see Figure 1-1) size and design to hold back and support the will be installed according to the general filter pack and in situ soils surrounding the procedures described in the DDJC-Sharpe/Tracy screen.The piezometer screen will include a Comprehensive Field Work Plan (URS, 2001) "pre-packed"filter pack along the full length of and as modified by this work plan. Seven the screen.The piezometer will have a temporary piezometers will be completed in the bentonite/grout seal above the filter pack that Above Upper Horizon with total depths ranging will be hydrated after emplacement. from approximately 20 to 40 feet below ground surface (bgs),and three temporary piezometers 6.2 Piezometer Location SurV@Vinq will be completed in the Upper Horizon with total depths ranging from approximately 40 to Horizontal coordinates of temporary piezome- 60 feet bgs. ters will be determined to the closest 1.0 foot and referenced to the State Plane Coordinate K:\02237\OU 1Pest-Rem\fina1\GW-EW-WrkP1n.dm $ June 2002