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Work Plan For a Limited Subsurface Investigation - Former Chevron Service Station #9-5775 <br />November 24. 1998 <br />in Task 5. Stockpiled soil will be transported for disposal at an appropriately licensed facility <br />by Integrated Wastestream Management (IWM). Steam cleaning rinsate waste water will be <br />transported by IWM to McKittrick Waste Management. <br />Task 4. Well Development and Sampling <br />The newly installed groundwater monitoring wells will be developed after being allowed to <br />stand a minimum of 72 hours following completion. During development, the clarity of the <br />discharged well water and selected groundwater parameters (pH, temperature, conductivity) <br />will be monitored. When the discharge water runs clear and the groundwater parameters have <br />stabilized, a groundwater sample will be collected from each well. Groundwater removed from <br />the well during development and sampling will be transported by IWM to McKittrick Waste <br />Management. The groundwater samples will be analyzed as described in Task 5. <br />Task 5. Wellhead Survey <br />Following installation, the elevation of the top of well casing will be surveyed to mean sea level <br />by a Virgil Chavez Surveying (P.L.S. #6323). Horizontal coordinates of the well will also be <br />obtained. <br />Task 6. Laboratory Analyses <br />Soil and groundwater samples will be submitted for chemical analysis at Sequoia Analytical, <br />a California state -certified Hazardous Material Testing Laboratory (ELAP 41210, #1271, and <br />#1624). Selected soil samples will be analyzed for TPHg by DHS LOFT, 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, TBA, DIPE, TAME <br />and ETBE by EPA Method 8260. The sample of the stockpiled drill cuttings will be analyzed <br />for TPHg and BTEX. <br />Task 7. 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. Two interpretive cross-sections will <br />be included in the report. This report will be submitted to Chevron for their use and <br />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 />346341.04-1 4 <br />