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1 <br /> detection limits at RESNA for BTEX and TPHG in soils is 0 005 part per million (ppm) and 10 <br /> PPM, respectively <br /> 3.3 Contingency Workscope <br /> If obvious soil contamination extends to the water table, each of the three soil borings will be <br /> ' converted to groundwater monitoring wells by advancing the boring 15 feet below static water <br /> level for well installation The wells will be constructed of two inch diameter F480 threaded <br /> PVC screen/casing No glues or solvents will be used. Screen slot size will be 0 010 inch <br /> Sand pack material will be #2 pre-washed silica-sand A minimum two foot bentonite seal will <br /> be placed prior to grouting with cement grout Wells will be installed to a depth of <br /> approximately 60 feet below grade Well completion depth is based on the setting of the well <br /> ' screen 15 feet below and 5 feet above the saturated zone This construction will allow for <br /> groundwater fluctuations Actual completion depths will be determined in the field based on <br /> ' hydrogeologic conditions encountered. Typical monitoring well completion will be as shown <br /> on Figure 4 <br /> Following installation, each monitoring well will be developed using swab and bail techniques <br /> in accordance with RESNA's QA/QC Plan, groundwater development protocol (Appendix III) <br /> The wells will be developed until they are relatively sediment free All water produced during <br />' well development will be contained 1n DOT 17H drums on-site pending determination of method <br /> for proper disposal <br /> Wellhead elevations and locations will be surveyed to allow lateral and vertical control for data <br /> reduction Surveying will be performed under the direction of a California registered surveyor <br /> or California registered civil engineer <br /> Fluid levels will be obtained from all monitoring wells following development, after fluid levels <br />' have been allowed to stabilize Levels will be taken using a water level probe capable of <br /> measuring the depth to water with an accuracy of 11100th of a foot Fluid levels will allow <br /> WP012892 TJL 5 <br />