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All development water will be dispersed on the ground next to the well location. A dedicated <br />submersible pump will be installed that will be similar to the existing pumps. <br />2.2.4 Groundwater Sampling from Permanent Wells <br />Permanent groundwater monitoring wells will be sampled in accordance with WDR Order <br />No. 5-01-176 and the monitoring program. Sampling will occur at the next scheduled <br />monitoring event after the well is installed. <br />2.2.5 Groundwater Sampling from Temporary Wells <br />Groundwater from the offsite borings will be collected at the saturated zone by hydropunch or <br />equivalent technology. The HydroPunch will be driven a minimum of two feet into saturated soil as <br />identified by the driller and site geologist, and a groundwater sample taken. The groundwater <br />samples will be analyzed for VOCs by EPA Method 8260 and general water quality parameters. <br />Some of the general water quality parameters will be measured in the field using a water quality <br />meter, other water quality parameters will be analyzed in the laboratory. <br />After collection, the groundwater samples will be placed into a pre -cooled ice chest for shipment. <br />All samples will be documented in the field and transported to the laboratory in accordance with <br />EPA Chain -of -Custody protocol. <br />All hydropunch groundwater samples will follow CHSL Specification Section 02670 <br />(Appendix A). <br />2.2.6 Vadose Zone Soil Gas Sampling <br />All soil borings will be sampled for soil gas at three depth intervals (approximately 20 ft, 40 ft <br />and 65 feet). These samples will be colleted in separate vessels provided by a state certified <br />laboratory under chain of custody. <br />A portable gas analyzer will be used to monitor methane, oxygen, and carbon dioxide <br />concentrations within boring prior to soil gas sampling. The gas analyzer is equipped with an <br />internal vacuum pump designed to extract gas samples. The gas analyzer will be used to <br />evacuate (purge) ambient air from the monitoring points and monitor the concentration of <br />methane, carbon dioxide, and oxygen in the boring prior to collecting samples for laboratory <br />analysis. Purged gases were monitored for indications of parameter stabilization prior to the <br />collection of gas samples, similar to parameter stabilization monitoring during routine <br />groundwater sampling procedures. <br />Corral Hollow EMP WPlan Rev2Mar 22-07.DOC 2-5 March 20, 2007 <br />