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� <br /> _ <br /> . ^ <br /> ETS ENVIRONMENTAL PROJECT 302 <br /> PAGE 2 <br /> be conducted according to standard industry practice to <br /> ensure the safe and reliable collection of data. Drilling, <br /> well construction and sampling procedures are described in <br /> detail in Appendix A. <br /> ETS will drill a total of five soil borings at this <br /> time. Each boring will be drilled using hollowstem auger, <br /> and the soil samples will be collected in brass sleeves <br /> driven in a California modified split-spoon sampler. Samples <br /> will be collected at five feet intervals to groundwater. <br /> This depth is presently believed to be approximately 15 feet. <br /> Soil samples will be handled via chain-of-custody and <br /> analyzed by a California Certified laboratory for TPH using <br /> EPA method 8015 Modified. During this phase of the <br /> investigation it is not felt that any further lab analysis is <br /> necessary. Should contamination be detected in significant <br /> quantities, additional analyses may be required. <br /> Soil cuttings will be drummed in 55-gallon plastic <br /> barrels and left on site for later treatment and/or disposal. <br /> If contamination is encountered in the soil, a soil <br /> boring may be completed as a well. In this case, the boring <br /> will be advanced to 10 feet below groundwater or to the first <br /> competent clay layer greater than one foot thick. The well <br /> will be constructed according to the protocol in Appendix A. <br /> A well construction diagram is also included in the protocol. <br /> Up to three soil borings may be completed as wells. <br /> This will allow for gradient determination as well as provide <br /> ETS with several extraction/injection points for future <br /> remediation if required. <br /> All wells will be developed by nitrogen purging. <br /> Groundwater samples will be collected in a Teflon bailer <br /> properly cleaned, and sent to a California certified lab for <br /> analysis using EPA methods 601 and 602 for BTX and gasoline <br /> or diesel. <br /> A report will be prepared at the conclusion of this <br /> phase of the investigation. The report will contain all <br /> laboratory data, as well as other information collected. <br /> Conclusions based on the findings of the report will be <br /> stated and recommendations, based on those conclusions will <br /> be made. <br /> Recommendations may include the continuation or <br /> cessation of field investigation. Should contamination be <br /> found in the groundwater, a survey of nearby wells will be <br /> conducted to locate areas of potential risk. A survey of the <br /> wells at this time is not necessary since subsurface <br /> contamination has not been determined. <br />