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%..� To reduce the potential for cross contamination between wells, the monitoring will take place in order from the least to most contaminated, if known. Well containing free product will be monitored last. Between each well monitoring the equipment will be decontaminated. Water level data collected from the wells will be used to develop a groundwater contour map for the project site. Groundwater flow will be estimated to be perpendicular to equipotential lines drawn on the map. 10.0 WELL DEVELOPMENT PROTOCOL Groundwater monitoring wells will be surged and developed prior to sampling activities. Approximately 10 times the volume of water in the casing will be withdrawn if possible. If the aquifer is slow to recharge, development will continue until recharge is too slow to practically continue. The volume of water produced versus time will be recorded. All purged groundwater will be stored on-site in 55 gallon waste drums unless permission is granted by the appropriate regulatory agency to discharge the water to the ground surface or sanitary sewer. Drummed water will be labeled with the source of the water to help ensure appropriate disposal based on contamination levels. 11.0 SOIL SAMPLING PROTOCOL 11.1 Sample Collection During Drilling Activities A proposal will be submitted to the lead Regulatory Authority with proposed boring/sampling locations. The exact location and number of borings at each site will be determined in the field by the Project Geologist/Engineer. Prior to arriving at the sample site, the drill rig/augers will be steam cleaned and all sample equipment will be cleaned. Cleaning will be conducted on-site on all sampling equipment between each sample interval. Soil samples will be obtained using a California modified split-spoon sampler containing three, six inch long, two inch diameter brass tubes. The sampler will be driven 18 inches ahead of the hollow stem auger by a 140 pound hammer with a 30 inch drop in accordance with American Society for Testing and Materials (ASTM) Methods D 1586-84 for split barrel sampling of soil and D 1587-83 for thin-walled tube sampling of soils. The blows required to drive the sampler each six inch interval will be recorded on the boring log. The sampler will be removed from the boring and opened to reveal the brass tubes. One tube will be sealed with Teflon tape and plastic end caps, taped and labeled with the following information: data, time, project ID, sample ID, name of sampler and type of analysis. This sample will be immediately placed into a cooler containing dry ice or frozen chemical. A "high-low" temperature recording A