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Identified Contamination Source Evaluation <br />5. Small volumes of chemicals are <br />stored in a shed behind the <br />Quonset hut. Two empty <br />insecticide containers were <br />observed near the irrigation well. <br />(Current on-site) <br />Al <br />7 <br />Pe <br />10 <br />Three pole -mounted electrical <br />transformers were observed on the <br />Site; two of these were labeled <br />PCB -free. (Current on-site) <br />Sampling results indicate that <br />nitrate and DBCP are present in <br />the domestic well at concentrations <br />of 18.6 mg/L-N and 0.29 ug/L, <br />respectively, and nitrate is present <br />in the irrigation well at a <br />concentration of 14.2 mg/L-N. <br />These values exceed the MCLs for <br />nitrate and DBCP. (Current on- <br />site) <br />Two aboveground storage tanks <br />were observed at the adjacent <br />property to the south of the Site. <br />(Current off-site) <br />Four 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 />One natural gas well was identified <br />within one-quarter mile of the Site; <br />the well has been plugged and <br />abandoned. (Past off-site) <br />The San Joaquin County <br />Environmental Health Department <br />provides regulatory oversight for <br />hazardous materials handling and <br />storage. It is anticipated that the <br />empty containers will be disposed <br />as part of routine "housekeeping." <br />The utility provider may have more <br />information on the PCB content of <br />the unlabeled transformer. <br />It is recommended that bottled water <br />be consumed until such time as the <br />well water can be brought to below <br />the MCL for these constituents. <br />Installation of a whole -house water <br />filter may be an option. <br />Although the tanks are relatively <br />close to the Site, no evidence of any <br />impact to the Site was identified. <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 drilling of the <br />natural gas wells. Regulatory <br />oversight for these activities is <br />provided by the California Geologic <br />Energy Management Division. <br />LOGE 2123 10 <br />