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Workplan for Supplemental Investigation 2005 Navy Drive, Stockton, CA January 2, 2013 Page 2 of 12 1.0 Introduction Risk-Based Decisions, Inc. (RBDI) is pleased to present this Workplan to identify the source of chlorinated volatile organic compounds (CVOCs) previously reported in groundwater beneath the subject property located at 2005 Navy Drive, Stockton, California (Figure 1). This workplan is a follow-up to your letter dated November 29, 2012 to Mr. Kent Calfee and our telephonic discussions on addressing your concerns. If the CVOCs are shown to originate from an offsite source, then a report summarizing all of the data will be prepared and submitted to the Central Valley Regional Water Quality Control Board (RWQCB) and will serve as the basis for requesting a No Further Action letter. If, on the other hand, the investigation proposed here demonstrates that the source of the CVOCs is from the property, the source will be sufficiently delineated to propose remediation and, once the remedial action objectives (RAOs) have been achieved, a No Further Action letter will be sought from the RWQCB. The scope of work proposed here is designed to provide a binary outcome: • Is the source of the existing CVOC contamination in groundwater from the subject property or not? In preparing this proposal, RBDI inspected the site and its surroundings on July 10, 2012. RBDI was able to locate the four existing groundwater monitoring wells (since destroyed in accordance with closure of the petroleum/UST issues with the prior approval of the RWQCB) and measured the dimensions of the onsite buildings to develop a more accurate figure which is now based on a recent aerial photograph (Figure 2, Plot Plan). Risk-Based Decisions, Inc.