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STATE (iF CALIFORNIA <br /> GEORGE OEUKMEJIAN Goveenir <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD IL <br /> — <br /> CENTRAL VALLEY REGION • - <br /> 3443 ROUTIER ROAD. SUITE A <br /> SACRAMENTO. CA 95827.3098 'f <br /> 14 September 1990 <br /> R. S. Moreau <br /> Lieutenant Commander, CEC, U. S. Navy <br /> Pub-1 i c Works Officer <br /> Naval Communication Station <br /> Stockton, California 95203-5000 <br /> INTERIM INVESTIGATION WORKPLAN, NAVAL COMMUNICATION STATION, STOCKTON, SAN <br /> JOAQUIN COUNTY <br /> Enclosed are our comments on your Interim Investigation Workplan prepared by the <br /> MARK Group dated 16 July 1990, and received 8 August 1990. This workplan is a <br /> fairly comprehensive hydrogeologic investigation of the Naval Communication <br /> Station site, particularly in regards to assessing the hydraulic relationships <br /> between the underlying water-bearing zones and surface water bodies. This <br /> workplan also concentrates heavily on assessing the potential pathways for the <br /> offsite migration of contaminants, rather than assessing individual source areas <br /> and internal contaminant plume boundaries. We concur with this approach, however <br /> we recommend that the wells proposed in the fire fighting area be relocated (see <br /> comment 2) , and that additional wells be located in the GSA area (comment 3) . <br /> The enclosed comment also discuss the need to sample for constituents other tha <br /> V Cs (comment to e an assessment our under ound ro�r�m <br /> common o sample offsite domestic wells comment 6) and to modify the <br /> surface water monitoring program comment 7 In addition, comment 4 states that <br /> additional source characterization and plume delineation work may be required in <br /> the future, depending on the results of this Interim Investigation. <br /> Please review the attached memorandum and submit an addendum to your 16 July 1990 <br /> Workplan, addressing our comments, by 15 October 1990. If you have any <br /> questions, please call John Tomko at (916) 455-5712 or Antonia Vorster at (916) <br /> 361- <br /> d1611* <br /> NI K. J. VORSTER <br /> Senior Engineer <br /> JJT:jt " <br /> cc+enc: James Pinasco, Department of Health Services, Sacramento <br /> Diane Hinson, San Joaquin Public Health Services, Stockton <br /> ichard Seraydarian, West Div. Naval Engineering Command, San Bruno <br /> N. Dean Marachi , The MARK Group, Pleasant Hill <br />