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Work Plan For a Limited Subsurface Investigation — Former Chevron Service Station #9-5775 <br />November 11, 1999 <br />Drill cuttings will be stored at the site pending receipt of disposal characterization data. The drill <br />cuttings will be stockpiled on and covered with plastic sheeting. Four discrete soil samples will <br />be collected from the drill cuttings for disposal characterization as described in Appendix A. <br />These samples will be submitted to the laboratory for compositing and analysis as described in <br />Task 5. Stockpiled soil will be transported for disposal at an appropriately licensed facility by <br />Integrated Wastestream Management (IWM). Steam cleaning rinsate waste water will be <br />transported by IWM to McKittrick Waste Management. <br />Task 3. Well Development and Sampling <br />The newly installed groundwater monitoring wells will be developed after being allowed to stand <br />a minimum of 72 hours following completion. During development, the clarity of the discharged <br />well water and selected groundwater parameters (pH, temperature, conductivity) will be <br />monitored. When the discharge water runs clear and the groundwater parameters have stabilized, <br />a groundwater sample will be collected from each well. The groundwater samples will be <br />analyzed as described in Task 5. Groundwater removed from the well during development and <br />sampling will be transported by IWM to McKittrick Waste Management. <br />Task 4. Wellhead Survey <br />Following installation, the top of casing elevations for all wells will be surveyed to mean sea <br />level by a California licensed surveyor. Horizontal coordinates of all well locations will also be <br />obtained by the surveyor. <br />Task 5. Laboratory Analyses <br />Soil and groundwater samples will be submitted for chemical analysis at Sequoia Analytical, a <br />California state -certified Hazardous Material Testing Laboratory (ELAP #1210, #1271, and <br />#1624). Selected soil samples will be analyzed for TPHg by DHS LUFT, and for benzene, <br />toluene, ethylbenzene and xylenes (BTEX) and MtBE by EPA Method 8020. Groundwater <br />samples will be analyzed for TPHg, BTEX and the fuel oxygenates MtBE, tert-butanol (TBA), <br />di -isopropyl ether (DIPE), TAME and ETBE by EPA Method 8260. The sample of the <br />stockpiled drill cuttings will be analyzed for TPHg and BTEX. <br />Task 6. Report Preparation <br />Following receipt and analysis of all data, a report will be prepared which summarizes the <br />procedures and findings associated with this investigation. This report will be submitted to <br />Chevron for their use and distribution. <br />PROJECT STAFF <br />Mr. Stephen J. Carter, a Registered Geologist in the State of California (R.G. No. 5577), will provide <br />technical oversight and review of the work. Mr. Greg Gurss, Senior Project Manager, will supervise <br />implementation of field and office operations. GR employs a staff of geologists, engineers, and <br />technicians who will assist with the project. <br />346408.06 <br />