SITE INFORMATION AND CORRESPONDENCE_1993-2003

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CALIFORNIA REGIONNATER QUALITY CONTROL BOARD Cal/EPA CENTRAL VALLEY R N ®8 3443 Routier Road, Suite A a� Sacramento, CA 95827-3098 Phone(916) 255-3000j JUL 19 1106 Pete Wilson,Governor FAX(916)255-3015 July 15, 1997 Mr. Wesley Harris Defense Distribution Region West- Sharpe Site P.O. Box 960001 Stockton, CA 95296-0710 RESPONSE TO NOTIFICATION OF INCOMPLETE PLUME CONTAINMENT, DEFENSE DISTRIBUTION REGION WEST, SHARPE FACILITY, SAN JOAQUIN COUNTY This letter discusses our concerns regarding lack of hydraulic control and plume capture at the DDRW Sharpe-Site. We request DDRW-Sharpe take specific actions to improve the operation of the ground water extraction systems and define the extent of volatile organic contamination in the groundwater according to a proposed time schedule in order to comply with the requirements of the OUI Record of Decision. Sharpe has not adequately responded to these requests previously made in Regional Board letters of June 1995, July 1996, October 1996 and again March 1997. Sharpe is violating, and threatens to continue violating, the ROD which requires full plume capture and a groundwater remedial system which is protective of human health. In its response to comments, Sharpe"takes exception to the statement in the comment regarding the continued lack of containment and cleanup," even though the Annual Report clearly admits the lack of capture in the North and Central Areas (Section 5.3.2 entitled, Extraction System Capture Zone). The Board, U.S. EPA and the Department of Toxic Substances, ask for a direct response from Sharpe regarding compliance with the ROD. Our agencies do not acknowledge the notification sent on 19 May 1997 by Radian International as a commitment by Sharpe. Sharpe must submit a Work Plan which includes a groundwater model to evaluate the effectiveness of the proposed interim modifications to the extraction system and the need for future long term design modifications. The Work Plan should also include a proposal to evaluate the need for additional sampling of domestic supply wells in the north base area to assure protection of human health. In addition, groundwater sampling points should be identified to determine the horizontal and vertical extent of offsite VOC contamination and a proposal to identify the source of this VOC contamination. The Work Plan must also address long term maintenance (i.e. scaling control). Once the Work Plan is -- approved by regulatory agencies the schedule for completing the work will be incorporated into the groundwater Remedial Design/Remedial-Action schedule under the Federal Facilities Agreement.