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• i <br /> E. Ratliff Project No. 1232 <br /> December 27 , 1991 <br /> Page 2 <br /> 2 . According to LDH "no holes (prior to removal) were noted <br /> in either tank (one had a new hole in it) " . The new hole `co�ld <br /> have been produced during tank removal. <br /> 3 . It was noted that there was a strong odor of petrole m <br /> on the north side of the excavation. However, the TPH and B XE <br /> values were non detected for the soil samples tested. The <br /> strong odor of petroleum could have resulted from diffusion Df <br /> the volatile gas from a nearby source e.g. , the contaminated <br /> soils encountered in boring B-6 during our previous <br /> investigations. <br /> 4 . A leak from the former underground tanks should have <br /> resulted in soil discoloration around the underground storage <br /> tank area or in the concrete slab. No mention was made by LHD <br /> of any such discoloration and the analytical test results did <br /> not indicate any contamination. <br /> 5. The proposed Work Plan was prepared with the objective <br /> of determining the source(s) of the contamination not the <br /> lateral or vertical extent of the contaminated soil. We believe <br /> that determination of the source(s) of the contamination should <br /> precede full-scale efforts to determine the extent of the <br /> contamination. <br /> 6. None of the samples collected around the site of <br /> excavation of the former underground storage tanks contained <br /> TPH or BTXE above the detection limit. <br /> 7 . TPH-G, benzene, xylenes and ethylbenzene were not <br /> detected in any samples collected from boring B-5. <br /> 8 . Two of the proposed borings in the Work Plan are located <br /> at the proximity of the PL-7 and the other two between boring <br /> B-6 and the sewer line; all three areas identified as suspect <br /> sources of contamination during our previous investigation. <br /> 9 . Removal of the concrete slab and piping is unwarranted. <br /> Two 10, 000 gallon underground storage tanks were removed in June <br /> 1986. The product lines were rinsed and the tanks were removed <br /> in accordance with a permit for tank removal issued by the San <br /> Joaquin Local Health District. No request for removal of the <br /> piping was made at the time the tanks were removed. Recent <br /> testing beneath the piping has confirmed the absence of <br /> contamination. <br /> Based upon the above, Montgomery Ward requested that EAI <br /> prepare a Work Plan for the determination of the source(s) of <br /> ENVIRONMENT L AUDIT,INC. <br />