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STATE OF CALIFORNIA <br /> GEORGE DEUKMEJIAN, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION ` <br /> 3443 ROUTIER RC1>D. SUITE A <br /> SACRAMENTO. CA 95827-3098 ^ <br /> SEP � 919J <br /> 14 September 1990 <br /> R. S. Moreau <br /> Lieutenant Commander, CEC, U. S. Navy <br /> Public 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 comments also discuss the need to sample for constituents other than <br /> VOCs (comment 1) , to include an assessment of your underground tank program <br /> (comment 5) , to 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 /> 361-5670. <br /> 4 <br /> d <br /> NI K. J. VORSTER <br /> Senior Engineer <br /> JJT:jt <br /> cc+enc: James Pinasco, Department of Health Services, Sacramento <br /> ane Hinson, San Joaquin Public Health Services, Stockton <br /> Richard Seraydarian, West Div. Naval Engineering Command, San Bruno <br /> N. Dean Marachi , The MARK Group, Pleasant Hill <br />