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T • Project No 58100-06-18 June 21, t995 Page 6 organic vapors in the pore space of the soil samples collected The headspace readings will be recorded on the boring logs submitted with the final report • Submit soil samples for the analyses of TPHg following EPA Test Method 8015 modified and BTEX following EPA Test Method 8020 • Provide quality assurance/quality control (QA/QC) procedures during the field activities These procedures will include cleansing/rinsing of the sampling equipment prior to each sampling effort, the cleansing/rinsing of the drill rig augers prior to and between borings and providing chain-of-custody documentation for each sample collected and transferred to the laboratory for analytical testing • All drilling, sampling, and related activities will be conducted under the supervision of a Certified Engineering Geologist or a Registered Geologist who willbe responsible for signing the final boring logs • Onsite soil generated during the boring activities will be collected in 55-gallon drums and stored onsite for disposal following regulatory protocol Install vapor extraction well VW-1 at the location shown on Figure 2 The vapor extraction well will be constructed using 4-inch diameter polyvinyl chloride (PVC) casing The lower portion of the well will be constructed using 85 feet of 0 030-inch slotted screen PVC casing A filter pack consisting of No 3 Monterey sand will be placed around the screen from the bottom of the boring to an elevation of two feet above the screen zone A surge block and intermittent groundwater extraction will be performed to densify the sand pack and to remove sediment prior to placement of a two foot thick seal consisting of hydrated bentonite chips Above the seal a mixture of bentonite powder and cement will be placed to within two feet of grade level A traffic-rated security wellhead cover set in a concrete pad will be used to complete construction Survey the top of casing elevations and the X-Y coordinates for all new and existing wells within the project boundaries relative to a Caltrans monument Task IV - Groundwater Monitoring Y A minimum of 24-hours after vapor extraction well construction, the water level will be measured in all wells, followed by subsequent purging and sampling Well purging will typically consist of the removal of three well volumes of groundwater within the well casing prior to the collection of a groundwater sample During purging, the pH, temperature, and electrical conductivity of the groundwater will be measured The wastewater generated during purging activities and sampling activities willbe stored in labelled 55-gallon drums and 0 left onsite for proper disposal