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<- Work Plan For Monitoring Well Installation,Tosco(Former BP)Service Station Number 11195, 16500 South Interstate-5,Lathrop CA <br /> April 19,2002 <br /> Soil from each sampled interval will be screened in the field for the presence of volatile <br /> organic compounds using a photoionization detector (PID). These data will be collected <br /> for reconnaissance purposes only, and will not be used as verification of the presence or <br /> absence of petroleum hydrocarbons. Screening data will be recorded on the boring logs. <br /> Drill cuttings will be stockpiled at the site pending receipt of chemical analytical data. <br /> Stockpiled cuttings will be placed on and covered with plastic sheeting pending disposal. <br /> Four samples of the drill cuttings will be collected for disposal characterization as <br /> described in Appendix. A. These samples will be submitted to the laboratory for <br /> compositing into one sample, and then analyzed as described in Task 5. Upon <br /> acceptance, drill cuttings will be removed from the site and transported to Allied Waste's <br /> Forward Landfill in Manteca, California. <br /> Task 3. Wellhead Survey <br /> Following installation, a California licensed surveyor will measure the elevation of the well <br /> casings, relative to mean sea level. The horizontal and Global Positioning System (GPS) <br /> coordinates of the wells will also be obtained at this time. <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 installation. Groundwater samples will be <br /> collected immediately upon completion of well development. Rinsate water and <br /> groundwater purged from the wells during development and sampling will be transported to <br /> the Tosco Refinery in Rodeo, California for disposal. The groundwater samples will be <br /> analyzed to assess groundwater quality as described in Task 5. <br /> Task 5. Laboratory Analyses <br /> Selected soil and all groundwater samples will be submitted for chemical analyses to a <br /> California state-certified Hazardous Material Testing Laboratory. Soil and groundwater <br /> samples will be analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg), <br /> Benzene, Toluene, Ethylbenzene, total Xylenes (BTEX) and Methyl tert-butyl ether <br /> (MtBE) by EPA Method 8260B. In addition, the groundwater samples will be analyzed <br /> for Ethanol, Tert-butyl alcohol (TBA), MtBE, Di-isopropyl ether (DIPE), Ethyl tert-butyl <br /> ether (ETBE), 1,2-Dichloroethane (1,2-DCA) Tert-amyl methyl ether (TAME) and <br /> Ethylene dibromide (EDB) by EPA method 8260B. The stockpiled soil sample will be <br /> analyzed for TPHg; BTEX and MtBE by EPA Method 801518021, as well as total lead by <br /> EPA Method 6010. <br /> 140193.12-1 <br /> 3 <br />