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Identified Contamination Source Evaluation & Recommendations 5. EHD records indicate that four water It appears that groundwater levels of wells located within approximately one nitrate and DBCP exceed the MCL at mile of the Site were tested for DBCP. some wells in the vicinity of the Site. DBCP was detected in one well at a Because the values are inconsistent, it is concentration of 1.8 pg/L; it was not unclear whether groundwater beneath the detected in the other three. The Site is likely to be impacted. Maximum Contaminant Level (MCL) set by the US EPA for DBCP is 0.2 lig/L. Three of the wells were tested for nitrate as NO3; it was detected in two of the wells at concentrations of 6.7 and 77.0 parts per million (ppm). Nitrate was not detected in the third well. The MCL set by the US EPA for nitrate as NO3 is 45 ppm. (Current off-site) 6. Agricultural irrigation infrastructure may Old concrete irrigation pipes may contain be present on the Site from past farming asbestos. If any such pipes are to be operations. (Current on-site) disturbed, the asbestos content should be determined, and any material found to contain asbestos should be dealt with in accordance with local, State, and Federal regulations. 7. One mapped gas well was identified Material generated during the drilling and within one-quarter mile of the Site. The development of gas wells may contain well is a plugged and abandoned dry diesel, mineral, or synthetic oils, hole. (Current and past off-site) weighting agents such as barium sulfate, bentonite clay, lignosulfonates and lignites, and various additives. These materials would be found where the drilling muds and fluids were disposed. Based on the distance from the well to the Site: there is no reason to suspect that the Site has been impacted. LOGE 1208 Page 7