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"r <br /> f <br /> Ms.Lori Duncan Page 8 of 9 <br /> San Joaquin County Environmental Health Department <br /> August 25,2004 <br /> RECOMMENDATIONS <br /> URS recommends that one shallow monitoring well be installed downgradient to monitor the <br /> groundwater interface and one deep well be installed to access the vertical extent of impacted <br /> groundwater. <br /> If you have any questions or comments regarding this letter,please call Mr. Vernon Elarth at(916) <br /> 679-2299. <br /> Sincerely, ���ED GEO� <br /> URS Corporation Americas �S O <br /> pAt1L F� 6% <br /> No. 7 20 <br /> * Exp. 1 a <br /> Michael Hall Vernon Elarth,R.G s�q CAl-1F0��\ <br /> Project Geologist Project Manager <br /> Attachments: Figure I — Site Location Map with Well Locations <br /> Figure 2 — Site Plan and Cross-Section Plan View <br /> 1 Figure 3 — Geologic Cross-Section A-A' <br /> Figure 4 — Geologic Cross-Section B-B' <br /> Figure 5 — Groundwater Elevation Contours <br /> Figure 6 — GRO in Groundwater 25' -45' bgs <br /> Figure 7 — GRO in Groundwater 45' -60' bgs <br /> Figure 8 — Benzene in Groundwater 25' -45' bgs <br /> Figure 9 — Benzene in Groundwater 45' - 60' bgs <br /> Figure 10— MtBE in Groundwater 25' -45' bgs <br /> Figure 11 — MtBE in Groundwater 45' -60' bgs <br /> Figure 12— GRO in Groundwater Cross-Section A-A' <br /> Figure 13— GRO in Groundwater Cross-Section B-B' <br /> Figure 14— Benzene in Groundwater Cross-Section A-A' <br /> Figure 15 —Benzene in Groundwater Cross-Section B-B' <br /> Figure 16—MtBE in Groundwater Cross-Section A-A' <br /> Figure 17 —MtBE in Groundwater B-B' <br /> Figure 18— GRO Concentrations vs Time in MW-5 <br /> Figure 19— Benzene Concentrations vs Time in MW-5 <br /> Figure 20—MtBE Concentrations vs Time in MW-5 <br /> Figure 21 —GRO Concentrations vs Distance <br /> Figure 22—Benzene Concentrations vs Distance <br /> Figure 23— MtBE Concentrations vs Distance <br /> Table 1 — Groundwater Gradient Data <br /> Table 2 — Floating Product Removal Summary <br /> KAWprocess\15 BP ARC010054812004 SCMISite Conceptual Model V2.doc <br />