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Z.3 Borehole Groundwater Sampling <br /> Boreholes were drilled to a depth of 50-55 feet at winch tune a 10 foot section of 0 010 slot, <br /> 2" diameter PVC well screen attached to 40-45 feet of 2" diameter PVC well casing was <br /> installed through the center of the auger The auger was removed and groundwater was <br /> allowed to equilibrate within the open borehole An electronic interface probe was utilized to <br /> check for the presence of free phase hydrocarbons. <br /> 1 <br /> A new disposable bailer was lowered through the temporary well screen and a grab sample of <br /> groundwater was collected. Each water sample was placed in appropriate containers, <br /> preserved and supplied by the laboratory Care was taken that no headspace was present in <br />' sample bottles which were analyzed for volatile organic compounds Once the samples were <br /> collected, the bottles were placed in "mploc" bags and sealed with security tape The samples <br /> were hand delivered immediately to the IT Field Analytical Services on-site laboratory <br /> The samples were analyzed utilizing the methods and detection knits shown below: <br /> DETECTION <br /> SAMPLE LIMIT <br /> ANALYSIS NAME CONTAINER METHOD (ppb) <br />' Benzene Three 40 ml volatile <br /> tolueneEPA modified 3 <br /> ethylbenzene HCaruc vials with 8020 3 <br />' xylenes 6 <br /> Two one liter amber DHS GC-FID <br />' TPH as diesel bottles with HCl modified 8015 50 <br /> Poly bag with Standard <br /> Coliform Bacteria Sodium Thiosulfate methods none declared <br /> coliform <br /> NOTE TPH = Total Petroleum Hydrocarbons <br /> Copies of signed chain of custody forms accompanied the samples at all tunes (Appendix B) <br /> Copies of laboratory reports are presented in Appendix C. <br /> MZ/03-I7-93/ENG/93-0034 if 4 <br />