Agmt14 Groundwater & Environmental Sevices, Inc.

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actions against the apparent responsible party for the discharge of solvents to the sewer system(the Bolton Family), and also in negotiations with insurance companies who had an obligation to defend the City in this matter. In support of those negotiations, Kleinfelder was retained to assist the City with evaluating potential remediation approaches and costs, and prepared a Technical Memorandum dated January 16, 2007,entitled Remedial Options and Preliminary Opinion of Potential Costs,regarding the solvent plume. GES understands that a monetary settlement was reached with the Bolton Family and the insurers, and sometime in 2008 a meeting was held with California Regional Water Quality Control Board (RWQCB) staff to discuss the required steps leading to the development and implementation of a remediation plan for the site. GES was retained by the City in January 2014 to review available environmental information, conduct a Site reconnaissance,and prepare a Workplan for additional activities. SCOPE-OF-WORK GES will perform the following activities,as described in the July 30,2014,Workplan: Task 1—DWR Well Completion Report Request GES will submit a request to the State of California Department of Water Resources (DWR) for release of well completion and destruction reports in the Site vicinity. Onsite wells have been installed by several different parties over the past 7 to 15+ years, and GES has only very limited information on the construction details for the wells. Information available from DWR may provide details such as locations, depths, and screened intervals of wells, and when wells were installed or destroyed, etc. This information will be useful for resuming the groundwater monitoring program for the Site(Task 2 below). Task 2—Initial Quarterly Groundwater Monitoring Event and Well Maintenance Program Because many of the existing Site wells have not been monitored or maintained for many years, GES will perform a well maintenance event in conjunction with purging and sampling groundwater from monitoring wells. Dedicated tubing and a check valve will be installed in each well and a tamper-proof cap and lock will be placed on each well for security purposes. Missing bolts on vault lids will be replaced. The wells that are confirmed will be surveyed for the lateral and vertical coordinates, and a new site map will be completed by a licensed surveyor, so that hydraulic gradient calculations can be performed using measured groundwater elevation data. GES is not aware of any other well survey data that may exist. GES will purge and sample groundwater from the wells. For budgeting purposes, we have included costs herein for an initial sampling event of 18 to 23 wells, depending on how many wells are verified and documented in the field. As described in the Workplan, GES anticipates that RWQCB will require monitoring on a quarterly basis for at least four (4) consecutive quarters. Once the monitoring program frequency is confirmed with RWQCB staff, and after we perform the initial monitoring event and can confirm the number of wells that will be included in the monitoring program, GES can provide costs for additional monitoring events. The initial monitoring event will include the following: • Gauge and sample the 17 known onsite wells, and one offsite well installed on City property in 2008 by Genesis Engineering and Redevelopment (Genesis), at the intersection of Jefferson Avenue and Middlefield Road,as part of the negotiations with the Bolton family; • Based on DWR well search findings and visual survey of the area, locate any other onsite wells for sampling,and mark them for the survey; • Install dedicated tubing and a check valve in each well, and replace any missing bolts on well vaults; ATTY/AGR/2014.174/GROUNDWATER&ENVIRONMENTAL SERVICES REV:10-7-14 MLG Page 10 of 12