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S EC ® R TRC Solutions (TRC), which includes groundwater elevations and analytical data collected during the second quarter 2005 point monitoring and sampling event 1 ' This report presents our understanding of existing conditions at the subject site The conclusions ± contained herein are based on the analytical results, and professional judgment In accordance with current standards of professional practice, no other warranty is expressed or implied SECOR assumes ' no responsibility for exploratory borings or data reported by other consultants or contractors ATTACHMENTS• ' • Table 1 -Groundwater Elevation and Analytical Data Table 2- Fuel Oxygenates Analytical Data • Table 3-Groundwater Gradient Data ' • Table 4- Batch Extraction Removal Data • Table 5-Sod Boring and Well Construction Details • Figure 1 -Groundwater Elevation Contour Map-Shallow Water Bearing Zone ' • Figure 2-Groundwater Elevation Contour Map-Intermediate Water Bearing Zone • Figure 3-Groundwater Elevation Contour Map-Deep Water Bearing Zone • Figure 4-TPHg Isoconcentration Contour Map-Shallow Water Bearing Zone ' a Figure 5-TPHg Isoconcentration Contour Map- Intermediate Water Bearing Zone * Figure 6-TPHg Isoconcentration Contour Map-- Deep Water Bearing Zone y �, ' • Figure 7- Benzene Isoconcentration Contour Map-Shallow Water Bearing Zone • Figure 8- Benzene Isoconcentration Contour Map- Intermediate Water Bearing Zoner Figure 9-Benzene Isoconcentration Contour Map- Deep Water Bearing Zone z • Figure 10-MTBE Isoconcentration Contour Map-Shallow Water Bearing Zone • Figure 11 -MTBE Isoconcentration Contour Map- Intermediate Water Bearing Zone • Figure 12-MTBE Isoconcentration Contour Map-Deep Water Bearing Zone ' I ' Figure 13- 1,2-DCA Isoconcentration Contour Map-Shallow Water Bearing Zone • Figure 14- 1,2-DCA Isoconcentration Contour Map- Intermediate Water Bearing Zone • Figure 15-1,2-DCA Isoconcentration Contour Map- Deep Water Bearing Zone k Attachment A-Remedial System Performance Evaluation Attachment B -SECOR's Procedures for Groundwater Sampling and Equipment Decontamination ' Attachment C -Certified Laboratory Analytical Reports, Cham-of-Custody Documentation, and Field Data Sheets (ARCO) Attachment D -Secon Quarter 2005 Groundwater Monitoring and Sampling Data Transmittal ' for Former 76 Service Station No 4409 (TRC) cc Mr James Barton, Regional Water Quality Control Board - Central Valley Region (RWQCB-CVR) r � ' Ms Lon Duncan, SJCPHS Vern Elrath, URS Corporation : 1 r a� 1 1A " IBR-AR=49321QMRs1200512QMR05 doc a a S a�