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Identified Contamination Source Evaluation & Recommendations <br /> 5. EHD records indicate that six water wells It appears that groundwater nitrate levels <br /> located within approximately one mile of in the vicinity of the Site are approaching <br /> the Site were tested for nitrate. Nitrate the MCL. The domestic well on the Site r-- <br /> as NO3 was detected in all six wells at will be tested for nitrate as part of the Soil <br /> concentrations of 27.0 to 42.2 parts per Suitability Study to follow this report. <br /> million (ppm). The Maximum <br /> Contaminant Level (MCL) set by the US <br /> EPA for nitrate as NO3 is 45 ppm. <br /> (Current off--site) <br /> 6. Agricultural irrigation infrastructure may Old concrete irrigation pipes may contain <br /> be present on the Site from past farming asbestos. If any such pipes are to be <br /> operations. (Current on-site) disturbed, the asbestos content should be <br /> determined, and any material found to <br /> contain asbestos should be dealt with in <br /> accordance with local, State, and Federal <br /> regulations. <br /> 7. Four mapped gas wells were identified Because these wells were drilled and <br /> within one-quarter mile of the Site. abandoned under Division of Oil and Gases <br /> (Current and past off-site) oversight, they are not anticipated to have <br /> impacted the Site. <br /> 8. One hazardous liquid pipeline was Based on the distance to the Site and the <br /> identified along Highway 33 (Ahern lack of any known leaks, the impact to the <br /> Road) approximately one-quarter mile Site from the pipeline is anticipated to be <br /> northeast of the Site. The pipeline is in minimal. <br /> service, operated by SFPP, and contains <br /> "multi-products," according to the NPMS. <br /> (Current off-site) <br /> 9.0 CONCLUSIONS <br /> This SSCR was prepared for the Lavelle property, 32521 South Koster Road, Tracy, <br /> California, to identify evidence of any on- or off-site, current or past, sources of <br /> contamination. Overall, the Site appears clean and well maintained. Several potential <br /> sources of contamination, typical of similar properties in the area, have been identified <br /> and summarized in Section 8.0. The San Joaquin County Environmental Heath <br /> Department will review this report and notify the property owner if any action is required <br /> at this time. <br /> �" LOGE 1133 Page 8 <br />