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INTER,`w4 <br /> �ONAL TECHNOLOGY CORPORATION <br /> Each soil sample retained for analysis will be described, checked for the presence of <br /> hydrocarbons, and promptly sealed with aluminum foil, plastic end caps and tape. The <br /> samples will then be placed in a "ziploc" bag, sealed with security tape and hand delivered to <br /> the onsite Iaboratory. Chain-of-custody records will be maintained for all samples. <br /> The samples will be analyzed utilizing the methods and detection limits shown below: <br /> Detection Limit <br /> Analysis name Method (ppm) <br /> i*. <br /> BTEX EPA modified 8020 <br /> (benzene, toluene, <br /> ethylbenzene, total 0.005 <br /> xylenes) <br /> TPH as diesel DHS GC-FID <br /> modified 8015 1 <br /> e <br /> 'Lower detection limits will be reported if attainable. <br /> NOTE: TPH = Total Petroleum Hydrocarbons <br /> s, <br /> Upon arrival to the laboratory, the samples' condition will be checked and any <br /> nonconformaties will be noted. Copies of signed laboratory reports and sample condition <br /> forms will be presented in the subsequent Site Assessment Report. <br /> 2.3 Borehole Groundwater Sampling <br /> Boreholes will be drilled to a depth of 50 feet at which time a 10 foot section of 0.010 slot, <br /> 2" diameter PVC well screen attached to 40 feet of 2" diameter PVC well casing will be <br /> installed through the center of the auger. The auger will be removed and groundwater will be <br /> 16, allowed to equilibrate within the open borehole. An electronic interface probe will be utilized <br /> to check for the presence of free phase hydrocarbons. <br /> A new disposable bailer will be lowered through the temporary well screen and a grab sample <br /> of groundwater will be collected. Each water sample will be placed in appropriate containers, <br /> preserved and supplied by the laboratory. Care will be taken that no headspace is present in <br /> sample bottles which will be analyzed for volatile organic compounds. Once the samples are <br /> t" collected, the bottles will be placed in "ziploc" bags and sealed with security tape. The <br /> L MZ09-28-92/ENG/9783.MER 5 <br /> i <br /> 4 <br />