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t� • Detections of tetrachloroethene (PCE)(not previously reported in Site groundwater samples) were limited to the northern perimeter of the Site. The occurrence of PCE is apparently unrelated to the same source as the 1,2-DCA, and is considered to be the result of a separate release not associated with the underground storage tanks. 1.2 Purpose of Investigation The penetration depth of the Stratoproberm was limited at the Site to a maximum depth of 65 feet bgs in the 2002 investigation. While the data collected provided good lateral delineation of the extent of 1,2-DCA groundwater impacts, data demonstrating the stability of the 1,2-DCA contaminant plume,its occurrence within the zone of historic low groundwater levels, and variations in its concentration with time are incomplete. These data gaps were identified in a letter from the SJC-EHD commenting on the 2002 1,2-DCA investigation (SJC-EHD, 2003). A copy of the letter is provided as Appendix A. The principal objective of the investigation Ir presented in this work plan is to fill those data gaps. 2.0 SCOPE OF WORK { The proposed scope of work for the additional 1,2-DCA investigation will include the following tasks: E • Coordination with regulatory agencies to finalize this work plan, and preparation of an updated health and safety plan; • Installation of two groundwater monitoring wells; • Preparations to resume quarterly groundwater monitoring,including contact with site owner regarding access, and permit application for purge water disposal; * • Completion of four quarterly groundwater sampling events and analysis of samples for total �+ petroleum hydrocarbons as diesel (TPH/D)by EPA Method 8015M and volatile organic compounds (VOCs)be EPA Method 8260B; • Submittal of Geotracker data as required by the California State Water Resources Control Board beginning with data collected during the second quarter of 2003; 1 • Preparation of letter reports following each sampling event; and, • Preparation of a summary report following the completion of the four sampling events. Details of these tasks and the methods to be used are presented in the following sections. 3.0 FINALIZATION OF WORK PLAN AND PREPARATION OF UPDATED HEALTH AND SAFETY PLAN L Following submittal of this draft work plan and its review by the SJC-EHD and RWQCB, comments will be incorporated as appropriate into a final document. Upon the approval of this work plan, a site-specific health and safety plan (HSP)will be developed in compliance with the L California Occupational Safety and Health Administration (CAL/OSHA)Hazardous Waste Operations and Emergency Response(HAZWOPER) standard (8 California Code of Regulations x 5192). The HSP will be prepared under the direction of a certified industrial hygienist. V 2