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8.0 IDENTIFIED CONTAMINATION SOURCES <br /> The following sources of past, current, on-site, and off-site contamination have been <br /> identified as a result of this investigation: <br /> Identified Contamination Source Evaluation & Recommendations <br /> 1 The Site was developed for irrigated Agricultural chemicals may remain in Site 1 Z , <br /> agriculture in the 1800s. Portions of the soils. The only way to determine the <br /> Site have been vineyard since 1889. presence or absence of these chemicals <br /> (Current and past on-site) is by testing and analysis. Typically, any <br /> such testing is conducted at the property <br /> owner's discretion. <br /> 2 Surrounding properties are used for Agricultural chemicals continue to be <br /> agriculture. (Current and past off-site) applied to these sites. Assuming <br /> responsible application, no action is ( I, <br /> warranted at this time. <br /> 3. An irrigation well is located on the Site. It appears that the well is currently in use. <br /> (Current on-site) l <br /> 4. Ten pole-mounted transformers were Transformers are of concern because the <br /> observed along the property lines, oil within them may contain <br /> Three of these near the northwest corner polychlorinated biphenyls (PCBs), which <br /> were noticeably old and discolored, but can contaminate soil in the event of a <br /> no obvious leakage was observed. leak. The property owner may wish to <br /> (Current on-site) contact the utility provider regarding the <br /> PCB content of the transformers and any <br /> recommended action. <br /> 5. Five nearby wells which have been It appears that DBCP is present at levels <br /> tested for nitrate or DBCP were exceeding the MCL in some groundwater <br /> identified at addresses located within in the vicinity of the Site. <br /> approximately 1.5 miles of the Site. All <br /> of the wells were tested for DBCP. <br /> DBCP was not detected in two wells, it <br /> was detected in the other three at <br /> concentrations of 0.07 to 2.8 ppb (µg/L). <br /> Three of the wells were tested for nitrate <br /> as NO3, it was detected in all three at <br /> concentrations of 12.5 to 34.0 mg/L. <br /> The Maximum Contaminant Level (MCL) <br /> set by the US EPA for nitrate as NO3 is <br /> 45 mg/L; the MCL for DBCP is 0.2 µg/L. <br /> (Current and past off-site) <br /> LOGE 1302 Page 6 <br />