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t SDMS Document Harding Lawson Associates 115575 October 20, 1995 29872 12.4 Ms. Sherrel Taylor-Domville United States Environmental Protection Agency Region II Emergency and Remedial Response Division 290 Broadway New York, New York 10007-1866 Supplemental Work Plan Remedial Investigation VICHEM Site St. Croix, U.S. Virgin Islands Dear Ms. Taylor-Domville: This letter is presented as the agreed upon follow up to discussions during the Virgin Islands Chemical (VICHEM) Remedial Investigation (RI) project meeting held on Friday, October 6, 1995. Harding Lawson Associates (HLA), on behalf of Island Chemical Company, will prepare a Supplemental Work Plan designed to address concerns raised by and discussed with EPA during the project meeting. The Supplemental Work Plan will include recommendations for further activities associated with the RI currently tmderway at the site. The tasks to be presented in the Supplemental Work Plan are proposed to be performed prior to completion of the RI report. The Supplemental Work Plan will include a revised schedule for completion of the RI and associated tasks. The following tasks, specified in the current project schedule, will be postponed pending EPA review and approval of the Supplemental Work Plan: Quarterly groundwater sampling event, currently scheduled for November 1995 Phase II Risk Assessment Activities, as may be required Preparation of RI Report Development of Remedial Action Objectives and Screening of Alternatives Feasibility Study, as may be required The Supplemental Work Plan will adhere to the currently approved Field Sampling Plan, Health and Safety Plan, and Quality Assurance Project Plan. Copies of these various plans will not be resubmitted with the Supplemental Work Plan. 305269 Engineering and 131 North Tfiird Street, Philadelphia, PA 19106-1903 215/627-4505 Fax 215/627-4250 Environmental Services .-l Subsidiary of Harding Associates ' Offices Kalionwide } Harding Lawson Associates October 20, 1995 29872 12.4 Ms. Sherrel Taylor-Domville United States Environmental Protection Agency HLA plans to submit the draft Supplemental Work Plan to EPA for review by November 21, 1995. A representative of HLA will telephone you on Monday, October 23 to confirm your receipt of this letter, and acceptance of the schedule modifications suggested above. Very truly yours, HARDING LAWSpN^^^OCIATES fason M. SchindlSfTP.G. Associate Geologist Edward A. Nemecek, R.G., CPG Regional Geosciences Manager cc: Santo Guillermain, Berlex Laboratories Lori G. Singer, Esq., Sills, Cummis, Zuckerman, Radin, Tischman, Epstein & Gross JMS/tg/DRM/mls/EAN G:\work\29872\wp\L9510-01.doc 305270