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X13 <br />. During the drilling investigation, petroleum hydrocarbons were <br />detected in the upgradient monitoring well, indicating a possible <br />offsite source. To investigate this possibility further, RESNA <br />Industries/WaterWork Corporation will investigate neighboring <br />properties for the possible sources of hydrocarbons. Available <br />State and County records and aerial photographs wall be searched <br />along with any additional sources that may be helpful. <br />7.1 Additional Soil Borings <br />To further delineate the petroleum hydrocarbon plume in the vadose <br />zone, WaterWork proposes to drill four additional soil borings <br />around the former diesel tank location (Figure 7). These borings <br />will be drilled to a maximum of 8 feet below grade. Soil borings <br />will be drilled until the lateral extent of soil contamination is <br />found. Confirmation of clean soils will be verified by analytical <br />analysis. <br />All borings will be sampled at the 5 -foot depth intervals using a <br />split -spoon sampler with brass liners. The material from one <br />sample ring will be described and field screened with a <br />photoionization detector (PID) for possible volatile organic <br />content. The second ring will be sealed at each end with Teflon <br />• tape and a plastic cap. The cap will be secured with tape and the <br />sample will be preserved on ice and transported under strict chain - <br />of -custody procedures to a state -certified laboratory. <br />Between sampling events, equipment will be cleaned using a three - <br />bucket wash system. In this system, the rings and samplers are <br />scrubbed with a brush an a bucket of tap water and detergent, then <br />rinsed in a bucket of tap water and a fa.nal rinse of distilled <br />water. <br />Borings will be drilled using an 8 -inch hollow -stem auger. No <br />fluids will be used during drilling activities. Following <br />completion of drilling, bentonite will be placed an the bottom of <br />each borings. The borings will then be backfilled to grade with <br />native cuttings. Should hydrocarbon impacted soils be encountered, <br />the boring will be backfilled with neat cement to grade. <br />7.2 Laboratory Analysis <br />Two samples from each boring will be submitted for laboratory <br />analysis; the sample with the highest PID reading, and the deepest <br />recovered sample. The samples will be analyzed for BTEX using EPA <br />method 8020, and TPHG and TPHD using modified EPA method 8015. <br />Corrigan Property - 381 <br />R0691 TLP 6 <br />