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Proiect Number 2098RV45 November 30 2017 1.0 INTRODUCTION A Site Investigation Work Plan (Work Plan), dated November 15, 2017 has been prepared by GSI Environmental Inc. (GSI) on behalf of Sims-Grupe Management Corporation, Inc. (SGM) in response to the Central Valley Regional Water Quality Control Board's (Water Board) Monitoring and Reporting Order R5-2017-0835 issued under Water Code Section 13267 dated 13 September 2017 (Order). The Work Plan was submitted to the Water Board for its review on November 15, 2017. On November 20, 2017, the Water Board requested an addendum to provide a work plan that includes a provision for groundwater investigation, detailed soil gas investigation procedures, soil gas probe permitting requirements, a groundwater investigation plan, and an investigation work schedule for these tasks to be completed by January 11, 2017. The Regional Water Quality Control Board (RWQCB) letter dated November 20, 2017 is included as Appendix A. The Order was issued to potentially responsible parties (PRPs) for the "Parkwoods Shopping Center" and "Parkwoods Cleaners." SGM refers to the center and cleaners as "Park Woods" though the spelling "Parkwoods" is used in the Order and both spellings have been identified in historical records. For consistency "Park Woods" is used in the Work Plan and this addendum. The Park Woods Shopping Center is located on West Hammer Lane between Brentwood Drive and Alexandria Place in Stockton, California (herein referred to as the "Site" and shown on Figure 1). The Order requires potentially responsible parties, including SGM, to provide current and historical operating information and investigate the potential presence of dry cleaning solvents in soil gas and groundwater. The Water Board issued the Order based on detections of tetrachlorethene (PCE; a common dry cleaning solvent) in groundwater samples collected from domestic wells located in the downgradient direction of groundwater flow from the Site. The domestic well groundwater samples were collected in August 2017. Dry cleaning operations were historically performed at the Site in tenant spaces 1744 West Hammer Lane (currently a pizza restaurant) and 1762 West Hammer Lane (current location of Park Wood Cleaners, which has operated as a drop-off facility since on-Site dry cleaning ceased in January 1995). SGM retained E2C Remediation (E2C) and GSI to assist in responding to the Order. An initial project meeting was held at the Water Board's office on 6 October 2017 where historical dry cleaning tenancy at the Site and an overview of the domestic well sampling data were discussed. Based on the historical on-Site dry cleaning operations and geographic location with respect to groundwater flow and detections of PCE in domestic well samples, Site investigation to assess whether releases of PCE have occurred is required. 1.1 Site Description The Site is approximately 4.86 acres of commercial property located at 1762 West Hammer Lane, Stockton, California. The Site is owned by SGM, a general partner of Lincoln Properties, Ltd., which also is named as a PRP in the Order. Based on information gathered to date by SGM, it appears that dry cleaning operations in the 1744 West Hammer Lane space began in approximately June 1959 and continued until March 1982, when the dry cleaning business moved to the 1762 West Hammer Lane space. The 1744 West Hammer Lane tenant space is currently occupied by David's New York Style Pizza. E2C Remediation 3