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LOGE 1610: Silva SSCR Update Page 6 June 14, 2016 Identified Contamination Source Evaluation 6. A 500-gallon above-ground diesel tank As with any property utilizing petroleum was located outside the shop. products and chemicals, the potential Automotive fluids in five-gallon buckets exits for the fuels and chemicals to be were observed to be stored inside the found in the surrounding soil. The San shop. A tank of formalin (a Joaquin County Environmental Health formaldehyde-based disinfectant) was Department regulates above-ground observed outside the milk barn. storage tanks and hazardous materials. (Current on-site) 7. At least 27 tires were observed at Mr. Silva indicated that the tires are various locations across the Site. used to weight down the silage piles. (Current on-site) 8. Piles of scrap metal were observed Mr. Silva indicated that the scrap metal south of the westernmost mobile home is used for various repairs across the and east of the larger silage pile. A dairy property. The brush pile is burned brush pile was also noted to the east under permit once per year, he said. of the silage pile. (Current on-site) 9. Nine pole-mounted transformers were The utility provider may have additional noted on the Site; some of these were information regarding the PCB content labeled with blue stickers to indicate of the transformers. that they are free of polychlorinated biphenyls (PCBs). (Current on-site) 10. A water sample was collected by It appears that ground water in the Dillon & Murphy from the adjacent vicinity of the Site contained DBCP house to the south as part of their slightly in excess of the MCL in 2005, 2005 Soil Suitability Study for the the current concentration is not known. subject Site, at that time, the house had not yet been divided from the main Site. DBCP was detected in the sample at a concentration of 0.225 µg/L, and nitrate as NO3 was detected at 11.6 mg/L. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L; the MCL for DBCP is 0.2 parts per billion (ppb, equivalent to µg/L). (Past off-site) Limitations and Signatures This SSCR Update has been prepared for the exclusive purpose of processing of a land use application through the San Joaquin County Environmental Health Department (EHD). It is authorized for use only by the client and the EHD, and for a maximum time period of six months from its date of completion. The standard of care employed is typical for this type of document.