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va,*,; (a <br /> Department of Toxic Substances Control <br /> Barbara A. Lee, Director <br /> Matthew Rodriquez Edmund G.Brown Jr. <br /> Secretary for 8800 Cal Center Drive <br /> Environmental Protection Sacramento, California 95826-3200 Governor <br /> TO: Lance McMahan, Project Manager <br /> Department of Toxic Substances Control <br /> 8800 Cal Center Drive <br /> Sacramento, CA 95826 <br /> FROM: Lynn Nakayama Wong, Ph.D. 4� <br /> Staff Toxicologist, Human and IF- lo gical Ris Office (HERO) <br /> DATE: JUNE 15, 2018 <br /> SUBJECT: RESPONSE TO COMMENTS ON THE GROUNDWATER MONITORING <br /> WORK PLAN, ROUGH AND READY ISLAND, PORT OF STOCKTON, <br /> STOCKTON, CALIFORNIA. <br /> PCA: 12018 Site: 101662-11 <br /> DOCUMENT REVIEWED: Response to Comments (RTC) on the Groundwater <br /> Monitoring Work Plan (GMWP) for Rough and Ready Island (RRI), Port of Stockton, <br /> Stockton, California. Document dated June 1, 2018. Prepared for Port of Stockton, <br /> Stockton, California. Prepared by Geosyntec Consultants, Rancho Cordova, California. <br /> HERO received a copy of the document on June 1, 2018. <br /> PREVIOUSLY REVIEWED DOCUMENT: In a memorandum dated May 1, 2018 (L. <br /> Nakayama Wong to L. McMahan), HERO provided a review of the Groundwater <br /> Monitoring Work Plan for Rough and Ready Island (RRI), Port of Stockton, Stockton, <br /> California, dated April 9, 2018. <br /> SCOPE OF REVIEW: This review focuses primarily on aspects related to Human <br /> Health Risk Assessment (HHRA). Minor grammatical or typographical errors that do not <br /> alter the interpretation of the work plan have not been noted. We defer to the DTSC site <br /> geologist and/or project manager on geotechnical aspects of the work plan. Any future <br /> changes or additions to the work plan should be clearly identified. <br /> GENERAL COMMENTS: <br /> 1. Response to HERO's May 1, 2018 General Comments #2 (Background) and #3 <br /> (Monitoring well selection) — HERO recommended the work plan include <br /> summary results of previous groundwater investigations and information on how <br /> the Port determined volatile organic compounds (VOCs) and Total Petroleum <br />