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Ms.Margaret Lagorio, SJCEHD October 21,2003 Joe's Truck Plaza Project No. 2033-15600-01 Work Plan for Additional Site Assessment Page 15 • Induced vacuum in observation wells, • Groundwater elevation in observation wells, • Well head vacuum, • Vapor extraction rates, and • Groundwater extraction rates. Observation wellheads will be temporarily modified to monitor depth to water and induced vacuum. Dedicated magnahelic gauges will be placed on the wellheads to monitor induced vacuum during DPE. Change in groundwater elevation will be periodically (every hour or at significant change in flow rates) monitored using a hand held water level indicator. A photoionization recorder (PID) will also be used to monitor the concentration of volatile organic compounds in the extracted soil vapors. A minimum of two soil vapor and two groundwater samples will be collected during the DPE test. Soil vapor samples will be forwarded to a California-certified testing laboratory to be analyzed for TPHG, BTEX, MTBE, ETBE, TAME, DIPS, TBA, and 1,2-DCA as described in Task 3. Groundwater samples will be analyzed for TPHG, TPHD, methanol, BTEX, MTBE, ETBE, TAME, DIPE, TBA, 1,2-DCA, EDB, and ethanol as described in Task 3. Strict chain-of-custody procedures will be followed. Reporting Upon completion of the feasibility study and assessment activities, and receipt of all analytical results, a document of findings will be prepared and submitted. The report will include, but not be limited to, analytical tables, a scaled site plan, geologic cross sections, iso-concentration contours, boring logs, certified analytical reports, and general findings of the assessment. The report will describe the field procedures, and evaluate results and observations during both the DPE and aquifer tests. The report will also include pumping test methods and procedures, tabulated field data such as flow rates, induced vacuums, and groundwater elevation measurements, and tabulated concentrations of petroleum hydrocarbons in extracted soil vapors and groundwater. The report will include estimated mass extraction rates, estimated capture zone for groundwater extraction and ROI for DPE, and calculated mass destruction rates. SCHEDULE Upon receiving approval of this work plan, the proposed work will be scheduled and a well permit application package will be submitted to SJCEHD. It will likely take approximately three to four weeks for a drilling contractor to become available. The drilling should be completed within three weeks of initiation, and the remaining fieldwork will likely require two additional weeks to complete. A report documenting P:\Joe's Truck Plaza\Work Plans\Joes workplan 102103.doc