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Geosyntecl--' consultants Response to Agency Review Comments on Draft and Revised Draft Investigation Work Plan Addendum UST 817B,Rough and Ready Island,Port of Stockton, California # Location Comment Response to Comment CVRWQCB Comments on Revised Draft Investigation Work Plan Addendum; Submittal: March 29,2022 1 Section 3.2.2.3 Central Valley Water Board staff will recognize non-detect and estimated Section 3.2.2.1 states that "The reporting (J-flagged)analytical values that are above respective San Francisco Bay limits for these analyses will be below ESLs Regional Water Quality Control Board Environmental Screening Levels listed in Table 1." The following text was (ESLs) as exceedances. It is advisable to make sure laboratory Method added to this section: "This will be confirmed Detection Limits and Reporting Limits are equal to, or below,the with the analytical laboratory prior to sample respective ESLs shown in Table 1. analysis." 2 Sections 3.1 and The Work Plan does not detail procedures for backfilling the proposed Section 3.1 states that prior to field activities, 3.2.1 boreholes. The forthcoming project report documenting the execution of Geosyntec will "obtain the required drilling this Work Plan will need to include borehole backfilling procedures. permits." Borehole backfilling procedures will need to comply with San Joaquin County Environmental Health Department requirements. Furthermore, Section 3.2.1 has been updated to include the please ensure all necessary permits are obtained from San Joaquin following text: County and coordinate for site inspections, as required by the County. "In accordance with San Joaquin County Environmental Health Department's Site Mitigation Well and Boring Permit conditions, boreholes will be backfilled with type IN Portland cement.A grout inspection will be scheduled with a San Joaquin County Environmental Health Department inspector who will observe borehole backfilling." 3 Appendix A The comments in this letter will need to reflect in Appendix A of the final Appendix A has been updated to include version of the Work Plan. responses to agency comments on the Revised Drat Investigation Work Plan Addendum. CVRWQCB Comments on Draft Investigation Work Plan Addendum; Submittal: September 30,2021 General Since the Work Plan states the Site did not meet criteria for closure under Sections 1.3.1, 2 and 3.2.2.3 include references the Low-Threat Underground Storage Tank Case Closure Policy,please to ESL screening criteria, which are also listed include a table in the Work Plan that includes relevant screening levels to in Table 1. compare existing and future data against. For example,relevant screening Response to Comments on Draft and Revised Draft Investigation Work Plan 1 June 21,2022 Addendum—UST 817B