ARCHIVED REPORTS_XR0008137 - Laserfiche WebLink

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2 Site maps, to scale, of area impacted showing locations of former and existing tank systems (Figure 3), elevation contours, gradients (Figures 6 and 7), and nearby surface waters (Figure 1), buildings, streets, and subsurface utilities (Figure 2), 3 High and low groundwater levels (below ground surface) (Section 3 3 2, Figures 6 and 7), 4 Tabulated results of all sampling and analyses (Tables 2 - 8), 5 Vertical and lateral concentration contours of contaminants found initially (Figures 10-15), and those remaining (Figures 18-21) in soil and groundwater, both on- and ' off-site, 6 Mass balance calculation of the substance treated versus that remaining (Section 4 2 and Appendix E), 7 Technology used to clean the site, if Best Available Technology (BAT) was not used, explain why (Section 2 2 and 4 1), 8 Zone of influence calculated for the subsurface remediation system and the zone of capture attained for the soil and groundwater remedtation system (not applicable), 9 Reasons why "background" wasps unattainable using BAT (Sections 4 1, 4 2, and 6 0), and 10 Rationale why conditions remaining at the site will not adversely impact water quality, health, or other beneficial uses (Sections 5 0, 6 0) This report includes information relevant to the above requirements,together with the results of the groundwater monitoring conducted in May, 1994 Section 2 0 presents a brief background of the site, including site history and a summary of corrective actions Section 3 0 discusses the hydrogeologic setting, groundwater use, and groundwater monitoring A summary of remedial activities, the distribution of soil constituents prior to and following remedial activities, and mass balance calculations are presented in Section,4 0 Fate and transport modeling to assess possible groundwater impacts is presented in Section 5 0 Section 6 0 summarizes information presented leading to the conclusion that site conditions will not adversely impact water quality, health, or other beneficial uses Appendix A includes a description of sampling methods and QA/QC procedures for the May 1994 groundwater monitoring round Appendix B includes laboratory reports and field records for the May 1994 groundwater sampling round Input and output files for fate and transport modeling are included in Appendix C The RWQCB guidance document, "Appendix B — Requests for Closure," is included as Appendix D Appendix E includes the mass balance calculations SAC 116 07 2 AUGUST 1994 DAMES & MOORE