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k ' 1-M <br /> ��.r'i�e�� <br /> a <br /> i <br /> September 12,1991 <br /> Texaco Environmental Services Page 2 <br /> 02120 1700 <br /> (TpH-G) concentrations ranged between 62,000 and 430 parts per billion(ppb). Benzene concentrations <br /> ranged between 20,000 and 0.7 ppb. Copios of the laboratory reports of this s3;npiin9 event are presented <br /> In Appendix B. <br /> .3.0 PROPOSED SCOPE OF WORK <br /> extent of the dissolved hyd,o arbon constituents In the <br /> In order to further define the lateral <br /> groundwater aruund',no site,the folloWing work steps are recommended: <br /> Drill%ilx boOngs enc'.Install six monitoring wells around the perimeter of the site(Fl l+!re 2, <br /> Appeixiix A), to further define the lateral extent of the water table forolved ort nourinluwell <br /> Borings would be drilled to 50 feet BGS or 10 fleet into the 1 <br /> alla were basad on the <br /> Installation. The locations of the proposed monitoring wI <br /> concentrations and extant a#'he dissolved hydrocarbon plume(Figure 3,Appendix.A). <br /> Develop tha monitoring wells and collect representative water rrpies for laboratory <br /> analyses following CRVVQCB guidelines. <br /> i <br /> Survey wellhoad elevations and locations for vertical and horizontal contras. <br /> Monitor the wells to determine depth to groundwater, and to detect the presence of <br /> i <br /> separate phase petroleum, if any. <br /> Obtain representative water samples from the wells for analyses a# benzene, toluene, <br /> ethylbenzene and xylenes(STEX)and TPH•G. <br /> 3.1 HEALTH AND SAFETY PLAN i <br /> Groundwater Technology has prepared a Sits-Specific Health and Safety Plan required by <br /> Occupational P,s:fety and health Administration (OSHA) Standard "Hazardous Waste operations and <br /> Emergency Resporae" (29 CFR 1910.120). <br /> This pian addrbsses any Pete+-I chemical and physical <br /> rsonnel and any subcontractors may encounter while v�orking <br /> exposures that Groundwater Technology pe <br /> at Via elle. A cosy of this document will be reviewed by all personnel involved with the drilling/installation <br /> equipment, or handling of potentially contaminated samples. <br /> of the monitoring wells,decontamination of <br /> r; 1 [41 GxatlNuwa'3 sn <br /> .. i TECHNOLOGY,INC. <br /> 17POW KPLRPr . <br /> i <br /> III IIIP I III <br /> t ' <br />