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[:1 <br />7 <br />0 <br />Identified Contamination Source Evaluation <br />Five facilities within one-quarter <br />mile of the Site were identified on <br />the San Joaquin County <br />Environmental Health Department's <br />lists of hazardous materials, <br />hazardous waste, and fuel tank <br />sites. (Current and past off-site) <br />The Site is located within the Lodi <br />Gas Field. A total of 13 natural gas <br />wells were identified within one- <br />quarter mile of the Site. (Current <br />and past off-site) <br />A natural gas pipeline was <br />identified within one-quarter mile to <br />the west, northwest, and south of <br />the Site. The pipeline is operated <br />by Lodi Gas Storage. (Current on- <br />site) <br />Of the 17 wells within a one -mile <br />radius of the Site tested for DBCP, <br />DBCP was detected in four of the <br />wells at concentrations between <br />0.01 and 0.2 ug/L, in three of the <br />wells at concentrations over 0.2 <br />ug/L, and was not detected in the <br />other 10 wells. The Maximum <br />Contaminant Level (MCL) set by <br />the US EPA for DBCP is 0.2 �tg/L. <br />(Current off-site) <br />No evidence was identified to <br />suggest that these facilities have <br />impacted the subject Site. <br />Hazardous materials may be <br />associated with the operation of the <br />natural gas wells and the separator <br />facility. Regulatory oversight for <br />these activities is provided by the <br />California Geologic Energy <br />Management Division. <br />The Office of Pipeline Safety, within <br />the U.S. Department of <br />Transportation, Pipeline and <br />Hazardous Materials Safety <br />Administration, has regulatory <br />responsibility for gas pipelines under <br />its jurisdiction. <br />Levels of DBCP in ground water <br />exceed the MCL in some nearby <br />wells. The on-site well will be tested <br />for nitrate and DBCP as part of the <br />Soil Suitability/Nitrate Loading Study <br />to follow this report. <br />LOGE 2152 10 <br />