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LOGE 1610: Silva SSCR Update Page 5 June 14, 2016 National Pipeline Mapping System Database Live Oak reviewed the National Pipeline Mapping System (NPMS) database on June 1, 2016 for evidence of hazardous materials pipelines within one-quarter mile of the Site. No pipelines were identified within the search area. Local pipelines which are not mapped by the NPMS may be present in the area. Conclusions The following sources of past, current, on-site, and off-site contamination have been identified as a result of this investigation: Identified Contamination Source Evaluation 1. A portion of the Site has been used as Confinement of cattle can lead to a dairy since 1967. Water from the elevated levels of nitrate and other manure pond is applied to the land in constituents. The San Joaquin County accordance with the California Water Environmental Health Department Quality Control Board's General Order, regulates dairies, and the California according to Mr. Pires. (Current and Water Quality Control Board regulates past on-site) pond maintenance and land application of wastewater. 2. The remainder of the Site has been As with any agricultural property, used for agriculture. Surrounding agricultural chemical residues may be properties are also agricultural. present in Site soils. The San Joaquin (Current and past on- and off-site) County Agricultural Commissioner's office regulates chemical application. 3. The permanent structures on the Site For any structure dating from the 1980s date to the 1920s through 1980s. The or earlier, the assumption is made that construction dates of the mobile lead-containing materials and/or homes are not known. (Current and pesticide residues may be present in past on-site) and around the structure. These materials should be addressed in accordance with all applicable regulations. 4. A domestic well and an irrigation well It appears that the current domestic and are located on the Site. Mr. Silva irrigation wells are in use. The former stated that a second domestic well on domestic well is no longer in service but the Site has been out of service since has not been destroyed. the new well was drilled, the pump has been removed from the top of the well. (Current and past on-site) 5. It appears that five septic systems are The systems are currently in use by the located on the Site. (Current and past house, milk barn, and four mobile on-site) homes.