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26 April 2011 AGE-NC Project No. 95-0104 Page 6 of 12 detect any constituents of concern. Analytical results of soil samples are summarized in Table 2. Boring logs are presented in Appendix C. A report of findings (Monitoring Well Installation Report-March 2008, dated 29 July 2008)was prepared by AGE and submitted to the EHD and RWQCB. General lithology, soil sample locations, and the estimated extent of impacted soil beneath the site before SVE remediation is depicted in cross sectional view in Figures 4 through 6 and in plan view in Figure 2. 2.4. GROUND WATER MONITORING EVENTS Between January 1993 and August 2010, approximately forty-six (46) ground water monitoring events were performed at the site to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site. Since initiation of the ground water monitoring program, ground water elevations have ranged from approximately 22 to 62 feet below the North American Vertical Datum 88 (NAVD88) and depths to ground water have ranged from approximately 52 to 92 feet below the tops of the well casings (btoc). Ground water at the site has consistently flowed towards the northeast. Ground water elevation data is summarized in Table 1. Figure 3 depicts historical ground water flow directions and illustrates the most recent contoured ground water elevations measured on 10 August 2010. 2.5. STRATIGRAPHY The soil profile beneath the site is generally composed of sandy silt and silty sand with lenses of clay and fine-grained sand and silt. Soil boring and well completion logs are presented in Appendix C. Cross sections A-A', B-B' and C-C' depict general lithology beneath the site (Figures 4, 5 and 6, respectively). 3.0. SENSITIVE RECEPTOR SURVEY A sensitive receptor survey is required as part of site characterization requirements under the California Code of Regulations - Title 23, Division 3, Chapter 16, Section 2654. AGE reviewed Water Well Drillers Reports (WWDRs) at the Department of Water Resources (DWR) and performed a door -to-door survey to determine the locations of water wells within a 2,000-foot radius of the subject property. Advanced CeoEnvironmental,tnc.