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GRANITE CONSTRUCTION — FRENCH CAMP Page 8 WKA No. 2088 .09 October 10, 2005 Sensitive Receptor Survey As part of our investigation, we performed a sensitive receptor survey for the surrounding area within a 2,00046ot radius of the property boundary. The purpose of this survey was to identify the relative proximity of conduits such as surface water bodies or water wells that might facilitate the transport of residual fuel constituents from the site to areas of potential humans or wildlife exposure. Our search for local surface water bodies consisted of a windshield survey and a review of the USGS 7.5 Minute Series Lathrop Quadrangle map . Based on the windshield survey and map review, the closest surface water body is the San Joaquin Irrigation District Canal located approximately 4,000 feet east of the property boundary, The San Joaquin River is located approximately 2 miles west of the property. In addition to the above windshield survey and review of the USGS 7.5 Minute Lathrop Quandrangle map, our water well survey included a review of the State of California Department of Water Resources (DWR) well construction records. These confidential records were obtained with the help of staff from DWR. Review of available information and telephone interviews with DWR and San Joaquin County Flood Control District personnel indicate that there are no public municipal or irrigation wells located within a 2,00046ot radius of the site. The nearest irrigation well (DWR #12P01 ) is located approximately 2,600 feet southeast from the site. During the well survey 33 wells were confirmed within a 2,000-foot radius of the site. Copies of the Water Well Drillers Report, State well numbers, boring logs and well construction details are included in Appendix H. Based on reported soil and groundwater petroleum hydrocarbon concentrations, the relatively flat groundwater gradient beneath the site, and the significant distance to sensitive receptors, the likelihood that sensitive receptors will be impacted appears minimal. Conclusions and Recommendations The majority of soil containing residual petroleum hydrocarbons was removed (approximately 7 00 cubic yards) from the site at the time of the UST removal and excavation activities. Groundwater WALLACE • KUI It E. A5SOCIA76S INC.