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S <br /> Ms. Lori Duncan <br /> ARCO Station 4493 <br /> Site Closure Report h <br /> October 31,2006 <br /> Page 7 <br /> Limitations <br /> This report has been prepared for the exclusive use of Atlantic Richfield Company, a BP Affiliated <br /> Company, and its representatives as it pertains to the property located at 205 North Center Street, <br /> Stockton, California. The evaluation of subsurface conditions at the site for the purpose of this <br /> investigation is inherently limited due to the number, of points of investigation. There are no <br /> representations,warranties,or guarantees that the results are representative of the entire site. Data <br /> from this report reflects the conditions at locations at a specified time. No other interpretation, <br /> representations,warranties, guarantees, express or implied, are included or intended in the report <br /> findings. <br /> i <br /> If you have any questions, please call Rusty Benkosky at (916) 861-0400 x 229. <br /> Sincerely, 99,OFESSIpN <br /> SECOR INTERNATIONAL INC. Q�� '13 <br /> w C 583 <br /> EXP.12/31/2006 <br /> Melissa Green Rusty Benkosky, .E. <br /> Associate Engineer Principal Engineer s'rq civil_ <br /> Ofi CxoF <br /> Figure 1 — Site Location Map <br /> 4 Figure 2 — Site Plan <br /> Figure 3— TPHg Concentration in Groundwater Second Quarter 2006 <br /> Figure 4 — MtBE Concentration in Groundwater Second Quarter 2006 <br /> Figure 5— Benzene Concentration in Grotl ndwater Second Quarter 2006 <br /> Table 1 — Historical Groundwater Monitoring and Analytical Data--> 1 TMA- —Z <br /> Table 2— Fuel Oxygenates Analytical Data <br /> Table 3 — Soil Boring and Well Construction Details <br /> Table 4 - Groundwater Gradient <br /> Table 5— Calculations for Mass of Contaminate Remaining in Groundwater <br /> Table 6 — Calculations for Mass of TPHg in Soil <br /> Attachment A— SJCEHD September 29, 2006 Letter <br /> Attachment B — Analytical Results for Soil Samples <br /> Attachment C — Boring Logs <br /> Attachment D — Geologic Cross Sections <br /> Attachment E — Chlorinated Hydrocarbon Trends <br /> nt F— Plume Analysis <br /> Attachment <br /> Attachment G — Sensitive Receptor Survey <br /> Attachment H — Appendix A Checklist for Req ired Data for No Further Action Request of <br /> Underground Storage Tanks <br /> cc: Mr. Don Pratt, Atlantic Richfield Company (uploaded to Enfos) <br /> Mr. James Barton, Regional Water Quality Control Board, Central Valley Region <br /> Ms. Kitty Walker, City of Stockton <br />