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-,''M � <br /> s <br />�r <br /> K <br /> Texaco Environmental Services Sta•nber 12, t9691�1 <br /> 02320 1700 Page 2 <br /> 'i <br /> �I <br /> (TPH-G) concentrations ranged between 62,000 and 430 parts per billion (ppb). Benzene concentrations <br /> ranged bstween 20,000 and 0.7 ppb. Copies of the laboratory reports of this sampling event are presented <br /> in Appendix B. <br /> 1 <br /> j <br /> ; <br /> 3.0 PROPOSES!SCOPE OF WORK <br /> t <br /> In order to further define the lateral extent of the dissolved hydrocarbon constituents In the <br /> groundwater around the sk i, the following work steps are recommended: f <br /> • Dr€!l six borings and Install six monitoring wells around the perimeter of the site (Figure 2, <br /> Appendix A), to further define the lateral extent of the dissolved hydrocarbon plume. <br /> Borings would be drifled to 50 feet BGS or 10 feet into the water table for monitoring well f <br /> Installation. The locations of the proposed monitoring wells were based on the <br /> concentrations and extent of the dissolved hydrocarbon plume(Figure 3, Appendix A). <br /> Develop the monitoring wells and collect representative wati.;r samples for laboratory <br /> analyses following CRWQCB guidelines. <br /> • Survey wellhead elevations and locations for vertical and horizontal control. <br /> • Monitor the wells to determine depth to groundwater, and to detect the presence of A, <br /> separate phase petroleum, If any. (, <br /> } <br /> • Obtain representative water samples from the wells for analyses of benzene, toluene, I <br /> ethylbenzene and xylenes(STEX)and TPH-G. <br /> 3.1 HEALTH AND SAFETY PLAN <br /> Groundwater Technology has prepared a Site-Specific Health and Safety Plan required by <br /> Occupational Safety and Health Administration (OSHA) Standard 'Hazardous Waste Operations and I <br /> rr ; <br /> Emergency Response' (29 CFR 1910,120). This plan addresses any potential chemical and physical <br /> exposures that Groundwater Technology personnel and any subcontractors may encounter while working <br /> at the site. A copy of this document will be reviewed by all personnel Involved with the drilling/Installation <br /> of the monitoring wells, decontamination of equipment,or handling of potentially contaminated samples. <br /> GROUNIMATER <br /> 7700WKPLRF _ _. .r TECHNOLOGY,INC. ; <br /> i <br /> t <br /> i <br /> € <br /> j <br /> j <br /> i <br /> J <br /> 1 <br />