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MOUNTAIN HOUSE TENt6RA-SOUZA PROPERTY �''� Page 6 WKA No. 5475.03 January 6, 2006 of the former pipeline, indicating that the lateral extent of impact of the TPH contamination was relatively small. Bruce& Joanne Kimbrough This facility is located at 17529 West Grant Line Road, located to the southeast of the subject property. No records at county or state agencies were encountered regarding the Bruce &Joanne Kimbrough facility. CONCLUSIONS The updating field reconnaissance revealed that the subject property has undergone several changes since the initial full-scope Phase 1 ESA completed for the subject property in 2003. The changes to the subject property include an ongoing waste removal operation from the dairy on the northern portion of the property as well as grading to the embankment adjacent to Mountain House Parkway. WKA observed no evidence of hazardous materials contamination, nor did WKA observe bulk storage of hazardous materials on the subject property. WKA recommends that surveys for asbestos containing materials and lead-based paint should be performed on the current structures if the client chooses for them to be demolished. The subject property contains at least three known water supply wells. If the wells will cease to be used, the water supply wells must be properly decommissioned; this procedure requires a well abandonment permit for each well from the SJCEHD. The existing residences on the subject property are and/or were serviced by at least two on-site septic systems. The septic systems are unlikely to have affected subsurface soils with hazardous materials, based on expected residential waste effluent as opposed to commercial or industrial wastewater discharges. When the property is redeveloped, each of the septic systems and associated leach fields and/or dry wells must be properly abandoned in accordance with San Joaquin County requirements and the recommendations of a qualified geotechnical engineer. WKA identified one known facility that could potentially affect groundwater quality in the area of the subject property, the Former Shell Central Valley Crude Oil Pipelines. Although it is unlikely that the subject property has been affected despite the northeasterly groundwater flow INK WALLACE•KUHL Er ASSOCIATES INC.