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POTINTIAL SOURCES OF CONTAMINATION <br /> There are no other known sources of contamination in the <br /> area. <br /> EXCAVATION OF THE TANK HOLE <br /> The tank hole contaminated material was excavated on <br /> November 4 and 5, 1987, to a de�th of 28+ feet. Field <br /> measurements were made using an OVA-128 meter. S-ampies were also <br /> analyzed in the laboratory. Results were as follows: <br /> Field TPH Test Results (11-5-87) <br /> OVA Meter <br /> f.�mRle 2��pth Location TPH (FPM) <br /> 1 @ 268 Southwest Corner Tank Hole 5(F <br /> 2 @ 181 Northwest Corner Tank Hole 4 <br /> 3 @ 281 Northeast Corner Tank Hole 0 <br /> 4 @ 171 North Center Tank Hole 0 <br /> 350 <br /> 5 @ 281 Southeast Corner Tank Hole <br /> Laboratory Anal Sis (Sample Date 11-5-B7) <br /> B EB T X <br /> Sample PPB PPB PPB <br /> TPH (PPM) PPB <br /> Location <br /> 1 @ 261 Southwest uorner Tank Hole 10 1 <br /> 2 @ 181 Northwest Corner Tank Hole 10 <br /> 3 @ 281 Northeast Corner Tank Hole 10 <br /> 4 @ 17' North Center Tank Hole 10 <br /> 5 @ 281 Southeast Corner Tank Hole 10 1 200 20 3,250 <br /> Field and laboratory tests itidicate the excavation generally <br /> limits of contamination <br /> extended to the vertical and horizontal <br /> except for test sample No. 5 at the southeast corner of Lh-� <br /> tankhole. <br /> Laboratory tests of BH-1 @ 201 and 35' indicate there has <br /> been some horizontal migration to the northeast at those depths. <br /> Deeper excavation was not possible due to the building at the <br /> the tank hole. BH-1 which is MW-1 is located about 5' <br /> edge of d tank hole. Before <br /> east Of the northeast corner of the excavate <br /> babkfilling the tank hole, 6-Mil plastic sheeting was placed in <br /> the bole to seal it against water infiltration. <br /> WATER SAMPLING <br /> MW-1 (BH-1) has been tested several times with the following <br /> results: <br /> -4- <br />