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i <br /> • Corrective Action Plan—Tosco (76) Service Station No 11192, Stockton, California <br /> March 13, 2002 <br /> Soil samples collected for description and possible chemical analysis will be obtained from each <br /> monitoring well boring at five-foot intervals, at a minimum Soil samples will not be collected from <br /> the sparge point borings Although the actual number of samples submitted for chemical analysis will <br /> depend on site conditions and field screening data, GR anticipates a minimum of one unsaturated soil <br /> sample from each boring will be submitted for chemical analysis <br /> Soil samples from each sampled interval will be screened in the field for the presence of volatile <br /> organic compounds using a photoionization detector (PID) Soil screening data will be collected for <br /> reconnaissance purposes only, and will not be used as verification of the presence or absence of <br /> petroleum hydrocarbons Screening data will be recorded on each boring log <br /> Drill cuttings will be stockpiled at the site pending analysis and disposal Stockpiled cuttings will be <br /> placed on and covered with plastic sheeting Four soil samples from the drill cuttings will be collected <br /> for disposal characterization as described in Appendix A Upon approval from the landfill, the drill <br /> cuttings will be transported by a Tosco-approved soil hauler to Forward Landfill, located in Manteca, <br /> California Water generated during cleaning of the drilling equipment will be stored at the site in <br /> properly labeled drums, pending transportation to the Tosco Refinery in Rodeo, California, for <br /> disposal <br /> . 4 4 Wellhead Survey <br /> Following installation, the top of the monitoring well casings will be surveyed to inean sea level by a <br /> California-licensed surveyor Horizontal and global positioning system (GPS) coordinates of the well <br /> locations will be obtained at the same time <br /> 4 5 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 installation Groundwater samples from the three new wells will be <br /> collected immediately upon completion of well development Groundwater purged from the wells <br /> during development and sampling will be transported to the Tosco Refinery in Rodeo, California, for <br /> disposal <br /> 4.6 Analyses <br /> All samples will be submitted to a California-certified Hazardous Materials Testing Laboratory <br /> Selected soil and all groundwater samples will be analyzed for TPHg, BTEX, and MtBE by EPA <br /> Methods 50301801518020 The laboratory will also be directed to analyze the samples for MtBE <br /> included with the five oxygenate compounds by EPA Method 8260 The disposal characterization <br /> sample from the soil stockpile will be analyzed for TPHg,BTEX, MtBE, and total lead as required by <br /> . the disposal facility <br /> 14024508 14 <br />