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• DDJC-Sharpe Permanen iiezometer Installation W rk Plan Addendum GMS Boundary Condition Verification investigation methods and standard operating • Data are consistent with project obj Ives; procedures are presented in Section 3.0. and 2.2 The objective of this work will be accomp- • Data are collected in a manner that w 11 lished through the implementation of the ensure accuracy,precision,completex ess, following activities: representativeness,and comparability. • Field inspection,marking,and documenta- 3.1.2 All CPT activities will conform totate tion of the proposed CPT locations; and other applicable regulatory requirem ts. All work shall be performed in accordance with • Review and coordination with the City of the DDJC-Sharpe/Tracy Comprehensive Field Lathrop, San Joaquin County Public Works, Work Plan Field Procedures(URS, 2001). The and Public Health Services,Environmental procedures for the work to be performed tinder Health Division,including preparation and this addendum are presented in the following submission of encroachment permits for sections of the Comprehensive Field Work Plan: work within the public road rights-of-way and well installation permits; • Location Surveying(Section 2.0); • Notification of Underground Service Alert • Cone Penetrometer Testing(Section 4.1); (USA)to obtain utility clearance of the planned CPT locations by the local utility • Groundwater Well/Piezometer Install tion companies or their representatives; (Section 5.0;also Section 3.2 of this work plan addendum); • CPT at each planned location, including dissipation testing to determine the depth to • Field Equipment Use and Calibration groundwater, and installation of permanent (Section 9.2); piezometers;and • Data Management(Section 11.0); and • Surveying by a licensed surveyor to digitize the location,top of casing elevation,and • Health and Safety(Section 12.0). ground surface elevation of each piezometer location. 3.2 Piezometer Materials 3.0 FIELD INVESTIGATION 3.2.1 The CPT drill rig will be used to co - PROCEDURES AND METHODS struct 1-inch outside diameter piezometers with the materials described in the following 3.1 Field Operations paragraphs. 3.1.1 The location and number piezometers 3.2.2 The piezometer casing will be 1-inc were selected in coordination with WES and outside diameter Schedule 40 polyvinyl ch oride based on location of temporary piezometers (PVC)pipe with flush threads.The casing installed in August and September 1998 for surface will be free of solvents,oils,greas , boundary verification for the groundwater paint,and dirt and will be certified clean f Din model. Attachment 1 shows the locations and the factory or steam-cleaned on site prior t groundwater elevation data of the temporary installation. Sections of casing will be received piezometers that were installed in August and from the supplier wrapped in polyethylene September 1998.The procedures presented in protective wrappers with sealed ends in order to this section are designed to ensure that: limit exposure to potential contaminants. Casing will not be removed from the wrapping until KA02238\Sharpe Piez WP\CPT addendum Sharpe.duc 3 Mar,h 20112