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Geosyntecl--' <br /> consultants <br /> # Location Comment Response to Comment <br /> levels could instead derive from the San Francisco Bay Regional Water <br /> Quality Control Board Environmental Screening Levels ESLs . <br /> 1 Section 1.2, For easy reference,please uniquely identify sample concentrations that Figures 2, 3, 4, and 5 have been revised to <br /> Page 2,Figure 2 are above their respective screening levels (e.g. the San Francisco Bay include applicable screening levels, and <br /> Regional Water Quality Control Board Environmental Screening Levels), concentrations that exceed their respective <br /> either through unique symbology and/or fonts. screening level have been highlighted. <br /> 2 Section 1.2, This paragraph indicates: 1) groundwater elevations fluctuate seasonally, This language has been removed. Groundwater <br /> Page 2, and 2)the groundwater gradients are generally flat within the vicinity of elevation data collected in August 2021 for <br /> Paragraph 4 the UST excavation area. wells in the immediate vicinity of the former <br /> Please provide visual evidence to support these statements by including a UST have been added to Figures 4 and 5. <br /> figure(or figures) showing groundwater elevations and contours for <br /> different seasons. <br /> 3 Section 2,Page Please explain the rationale for selecting sample depths for each boring Sample depths were revised to 2 feet, 4 feet, <br /> 3, Third Bullet (i.e.,the approximate 2 ft bgs and 5 ft bgs sample depths). and 6 feet below ground surface. These sample <br /> samples were chosen to assess the vertical <br /> distribution of contaminants in the soil within <br /> the formerly excavated area. Section 3.2.1 <br /> paragraph 5 has been updated to reflect this <br /> rationale. <br /> 4 Section 2,Page Please clarify the depth at which grab groundwater samples will be A grab groundwater sample will be collected <br /> 3,Fourth Bullet collected within each boring spanning the indicated 5-foot screen interval from each boring through the temporary <br /> (estimated to reside 7 ft bgs). For example,will it be the depth casing at approximately the middle of the <br /> groundwater is first encountered? water column using a discreet interval <br /> sampler. This language has been added to <br /> Section 2, the fourth bullet to clarify the depth <br /> at which groundwater will be collected. <br /> 5 Section 3.1, Please provide the site-specific Health and Safety Plan for the Central The Site-specific task hazard analysis has been <br /> Page 4 Valley Regional Water Board to review. provided in Appendix D. <br /> 6 Section 3.2.1, Please update Table 1 to reflect use of a portable photoionization detector Table I has been renamed Table 2 and has <br /> Page 4, to screen cores for VOCs in soil vapor. been updated to reflect the use of a PID for <br /> Paragraph 3 geld screening. <br /> Response to Comments on Draft and Revised Draft Investigation Work Plan 2 June 21,2022 <br /> Addendum—UST 817B <br />