Agmt14 Groundwater & Environmental Sevices, Inc.

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EXHIBIT "A" SCOPE OF SERVICES Groundwater & Environmental Services, Inc. (GES) will implement the tasks described in GES' "Site Conceptual Model and Workplan for Groundwater Monitoring and Remediation Planning" (Workplan) dated July 30, 2014, regarding the perchloroethylene (PCE) groundwater plume in the area of the Sequoia Station shopping center property at the intersection of El Camino Real and Jefferson Avenue in Redwood City,California (the Site). The Workplan activities include the following: Task 1 —DWR Well Completion Report Request; Task 2—Initial Quarterly Groundwater Monitoring Event and Well Maintenance Program; Task 3—Evaluation of Remedial Options; Task 4—Preparation of Remedial Action Plan(RAP); and Task 5—Consultation,Regulatory Agency Discussions,and Project Management. Site background information and a description of the above proposed tasks are presented below. BACK(�ROLTND Since the mid-1990s when the Sequoia Station shopping center was developed at the northeast corner of the intersection of El Camino Real and Jefferson Avenue, soil and groundwater investigations have been conducted by others at the various parcels of land that composed the shopping center property, and at nearby properties in the vicinity of the shopping center. Land uses at those parcels and properties have included automotive maintenance facilities, dry cleaners, gasoline service stations, and other uses. The Sequoia Station shopping center was redeveloped in the late 1990s by Safeway, one of the anchor tenants at the center. GES understands that the site is now owned by Regency Centers. Due to the presence of chlorinated solvents in groundwater beneath and near the shopping center property, investigations and activities conducted by others between approximately 1998 and 2008 have focused on: (1)the apparent sources of the solvents, (2)the extent and magnitude of the solvent plume, (3) assessment of potential human health risks associated with the solvents, and (4) the need for soil or groundwater remediation. The primary chemical of concern is PCE, and to a lesser degree trichloroethene(TCE), and cis-1, 2-dichloroethene(cis-1, 2-DCE). Investigations regarding the apparent source of the chlorinated hydrocarbons have focused on a dry cleaning business on the west side of El Camino Real (Roy's Cleaners), across from the Sequoia Station shopping center, and the sanitary sewer that likely received conveyed wastewater from the dry cleaning business. As the lead regulatory agency, the RWQCB has required the City and the owners of the Roy's Cleaners property to conduct investigations of the solvent plume, possibly leading to remediation activities. An investigation conducted by Subsurface Consultants, Inc. (SCI) in 2000 for the City identified a suspected source area adjacent to the sanitary sewer line beneath El Camino Real (approximately 200 feet north of Jefferson Avenue)where relatively high concentrations of PCE were found in groundwater on the downgradient side of the sewer line. In late 2003, MACTEC Engineering and Consulting, Inc. (MACTEC) conducted further investigation activities for the City, and presented results of their investigations in a report dated November 9,2004. In 2007,owners of Roy's Cleaners(the Bolton Family) retained Genesis Engineering to install two groundwater monitoring wells within and downgradient of the solvent plume area. Throughout this time, a consultant retained by Safeway (Einerson Fowler& Watson, later acquired by Conor Pacific) conducted groundwater monitoring activities at the site, as required by RWQCB staff. Between 2002 and 2008, the law firm Cox, Castle, and Nicholson (CC&N) represented the City in legal ATTY/AGR/2014.174/GROUNDWATER&ENVIRONMENTAL SERVICES REV:10-7-14 MLG Page 9 of 12