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g. �M Appendix A. Responsiveness Summary Martin Metals Finishing Inc. (Former) Stockton, California Response to Department of Toxic Substances Control (DTSC) Comments for CDIM's Preliminary Endangerment Assessment (PEA) and Supplemental Site Investigation (SSI)Work Plan (Work Plan), Martin Metal Finishing Inc. Stockton California, dated July 25, 2022. Comment Response for lead to have migrated from the sludge to soil, furthering the level of impact. • Finally, the historical analytical data that exists for the Site is very limited. No soil samples were collected deeper than 39 inches below ground surface (bgs)and no soil vapor samples were collected at all. Therefore, the GSB cannot conclude that any previous unauthorized releases pose no threat to the public health or the environment. 4. Page 14, Section 2.9-The GSB agrees with Comment acknowledged. CDIM on the following three data gaps: • Concentrations of COPCs in subsurface soil at the Site have not been established; • Concentrations of volatile COPCs, including toluene, in soil gas at the Site have not been established; and • Concentrations of COPCs in Mormon Slough have not been fully delineated. Furthermore, the GSB agrees with CDIM's recommendation that an additional subsurface investigation is warranted to address these data gaps. 5. The GSB generally concurs with CDIM's CDIM has adjusted the proposed scope of work, which proposed approach to the SSI. Focusing on near- is reflected in text Section 4.2.2—Sampling Location surface and subsurface soil, trench sediments, and and Intervals, to include the following: soil vapor will begin addressing the data gaps presented in the PEA. However, the GSB recommends that the following adjustments to the proposed scope of work be made: • Consider adding two additional three-boring Two additional three-boring rows of shallow rows to the Mormon Slough. One of the soil samples (MMF-SS-12A through MMF-SS- rows should be placed to the east of MMF- 12C and MMF-SS-16A through MMF-SS-16C) SS-07 and one to the west of MMF-SS-09. were added to proposed sampling plan in However, soil samples collected from these Mormon Slough (Figure 5). It should be noted borings can be submitted to the laboratory that all boring names in the PEA Work Plan on hold, pending the analytical results of have been revised from those listed in the Page A-3