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• i <br /> Work Plan for Additional Subsurface Investigation @ Former Unocal Station 40187 <br /> November 12, 1999 <br /> encountered during drilling. Proposed well construction details are presented in Figures 4, 5,and 6. <br /> Drill cuttings will be stored at the site pending receipt of chemical analytical data for disposal. The <br /> drill 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. These samples will be submitted <br /> to the laboratory for compositing and analysis, and will be collected as described in Task 5. <br /> Stockpiled soil and steam cleaning rinsate will be transported for disposal at an appropriately licensed <br /> facility. <br /> Task 3. Well Development and Sampling <br /> The newly installed groundwater monitoring wells will be developed after being allowed to stand a <br /> minimum of 72 hours following completion. During development,the clarity of the discharged well <br /> water and selected groundwater parameters(pH,temperature,and conductivity)will be monitored. <br /> When the discharge water runs clear and the groundwater parameters have stabilized,a groundwater <br /> sample will be collected. Groundwater removed from the well during development and sampling will <br /> be transported to an appropriately licensed facility for disposal. The groundwater samples will be <br /> analyzed as described in Task 5. The newly installed wells will be included in the quarterly <br /> monitoring program beginning with the quarter following installation. <br /> Task 4. Wellhead Surveying <br /> Following installation, the elevation of the top of well casings for all the wells at the site will be <br /> surveyed to mean sea level by a California licensed surveyor. Horizontal coordinates of the wells will <br /> also be obtained. <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#1624). <br /> Soil samples will be analyzed for TPHg by Modified EPA Method 8015, for benzene, toluene, <br /> ethylbenzene and xylenes(BTEX)and MtBE by EPA Method 8020. In addition, the groundwater <br /> samples will also be analyzed for the oxygenate compounds by EPA Method 8260. <br /> Task 6. Report Preparation <br /> Following receipt and analysis of all data,a report will be prepared which summarizes the procedures <br /> and findings associated with this investigation. This report will be submitted to Unocal for its use <br /> and distribution. <br /> 240042.05 6 <br />