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S E C ® R <br /> ARCO 595 <br /> May 5, 2004 <br /> . Page 6 <br /> J <br /> Should you have any additional Information, please contact the undersigned at(916) 861-0400 $ , <br /> Sincerely, <br /> SECOR International Incorporated <br /> Z <br /> Clinton Harms c� <br /> Project Scientist W C <br /> OSM <br /> tfa 6FL f asflam ° <br /> usty ,enkosky, P CAO' A�-�` <br /> Senior Engineer <br /> Attachments Figure 1 —Site Location Map <br /> Figure 2—Site Plan { <br /> Figure 3—Generalized Geologic Cross-Section A-A' <br /> Figure 4--Generalized Geologic Cross Section B-B' <br /> Figure 5—TPHg Isoconcentration Contour Map Shallow Water-Bearing Zone— <br /> January 8, 2004 <br /> Figure 6— Benzene Isoconcentration Contour Map Shallow Water-Bearing Zone— <br /> January 8, 2004 <br /> Figure 7—MtBE Isoconcentration Contour Map Shallow Water-Bearing Zone— <br /> • January 8, 2004 <br /> Figure 8— 1,2-DCA Isoconcentration Contour Map Shallow Water-Bearing Zone— <br /> January 8, 2004 <br /> Figure 9—MtBE Isoconcentration Contour Map Deep Water-Bearing Zone-- <br /> January 8, 2004 <br /> Figure 10— 1,2-DCA Isoconcentration Contour Map Deep Water-Bearing Zone— ^z <br /> January 8, 2004 <br /> Figure 11 —Site Conceptual Model <br /> Figure 12— Exposure Pathway Model <br /> Table 1 —Historical Soil Analytical Data <br /> Table 2—Soil Borings and Well Completions <br /> Table 3—Groundwater Monitoring Data and Analytical Results <br /> Table 4—Groundwater Analytical Results—Oxygenate Compounds <br /> Table 5—Historical Groundwater Gradient <br /> Table 6—Groundwater Treatment System Performance Data <br /> Attachment 1 — SJCEHD Approval Letter <br /> Attachment 2-- Historical Soil Sampling Maps <br /> Attachment 3— Boring Logs Y <br /> Attachment 4— Historical 2000-foot Radius Well Search Information <br /> Attachment 5—Graphs of Chemical Concentration vs Time <br /> cc Mr Paul Supple, Atlantic Richfield Company r <br /> y <br /> IARCO105951Reports\Site Conceptual Model doc <br /> a� <br />