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industrial, aid agricultural usage. The shallow aquifers, similar <br /> to the one in which the monitor wells are developed at this site, <br /> are basically used for privately owned small volume irrigation <br /> wells. Deeper wells are needed to guarantee water available for <br /> domestic, municipal, industrial, and agricultural purposes. <br /> 8OIL AHD Sam SAMPIX RROWNS <br /> Forty soil and four ground water samples were gathered from the <br /> borings and monitor Wells, preserved, and chain of custody hand <br /> delivered to ChemTech Laboratories for analysis. ChemTech <br /> analyzed the samples using modified RPA method 5030/8015-soil, <br /> 8015-water for Total Petroleum Hydorcarbons (T'PH) and SPA method <br /> 8020/602 for BTEZ. The sample results from the tank pull and <br /> product line sampling showed that Total Organic Lead and RDE do <br /> not exist at this site and these analysis were not run on the <br /> samples obtained from the exploratory borings, see Tables 1 and 4 <br /> and Appendix B. <br /> The sample results indicates that the soil beneath the tank <br /> excavation is contaminated to at least the 30 .foot depth and that <br /> ground water has been contaminated with gasoline range <br /> hydrocarbons and is migrating in a south-southeast direction from <br /> the tank excavation, see Figures 5A-5E and 6A-BS. <br /> FURTHER ASSESSMENT <br /> • Based upon the information provided by the tank excavation <br /> sampling and the sampling of the exploratory borings for the <br /> monitor wells, soil contamination, seems to be confined to the area <br /> directly beneath the excavation, specifically beneath tank <br /> excavation samples T3B and T4A, see Figures 6A thru 6E--30. <br /> To more Bally characterize the soil contamination associated with <br /> the tank excavation, WEQE intends to hand auger and sample the <br /> base of the excavation. VMS personnel will not go into the <br /> excavation or stand near an area that appears unstable (undercut, <br /> sloughing, etc. ) . The bolz/sampling will be performed from the <br /> surface with extenslons that will enable us to reach the <br /> excavation surface arA perform the sampling. This investigation <br /> will be performed ur4ng a two person team. The person doing the <br /> actual boring will he secured with a safety harness to the canopy <br /> supports of the pump island or store and/or the bumper of the <br /> equipment truck. The other person on the team is the geologist <br /> and safety officer Who will log the borings and take vapor <br /> readings with a hand held photoionizing detector (PID) , see Figure <br /> 8 for boring/sample locations. <br /> The sampling of the borings within the excavation will commence at <br /> the 20 foot depth and samples will be obtained in 5 foot intervals <br /> to the 35 foot depth. In order to safely perform the boring and <br /> sampling the driller will stand at the surface of the excavation, <br /> only in areas that inspections indicate are stable. Tt.e driller <br /> i <br /> 19 <br />