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V � Well Survevine The tops of the new wellheads will be surveyed and tied together with existing wells. Measurement of depth to water in all wells will be completed to evaluate the direction and magnitude of the groundwater gradient beneath the site. Groundwater Well Development and Sampline The new groundwater monitoring wells will be developed using surge and bail techniques until the produced water is relatively sediment free. Prior to the collection of groundwater samples from the monitoring wells, a minimum of three well volumes (casing and sandpack) will be purged. Temperature, pH, water elevation, and electric conductivity will be measured and allowed to stabilize. Water samples will be collected using disposable bailers, one dedicated to each well. Groundwater samples collected from all monitoring wells will be submitted using chain-of- custody record to a State-certified laboratory for analysis of TPHg and BTEX using EPA methods 8015/8020. Purge water will be stored in 55-gallon drums approved for hazardous liquid storage pending laboratory analysis. Pilot Test The vapor extraction wells will be used to conduct a pilot test to determine the efficiency of vapor extraction as a remediation technique and the range of influence of the vapor extraction system. The details concerning the pilot test will be discussed under a separate workplan along with proposed pilot testing for groundwater remediation. Report Preparation Following receipt of laboratory results, a report will be prepared summarizing the findings of the subsurface investigation for submittal to the client and PHS/EHD. The report will summarize field and laboratory procedures as well as all analytical data and contain recommendations for soil and groundwater remediation pilot tests. All work described in this workplan will be performed under the direct supervision of a California Registered Civil Engineer. All drilling activities will be performed under the supervision of a Smith Environmental field geologist and all site work will be performed in accordance with the Quality Assurance/Quality Control Plan and the Site Safety and Health Plan included in RESNA's "Workplan for Site Investigation" (August 1994). Two monitoring well installation permit applications, one for the on-site wells and one for the off-site wells, are contained in Attachment 1 with a check for the permit fee. w:\943734epmts\wp0496.do 3 SMTH