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k" KLEINFELDER I I I ATTACHMENT A SCOPE OF WORK MONITORING WELL INSTALLATION AND GROUNDWATER SAMPLING AND ANALYSES PROPOSED DSS GRAVEL PIT (QX-96-1) KOSTER ROAD FACILITY TRACY, CALIFORNIA INTRODUCTION Kleinfelder is pleased to present this revised proposal to DSS Company. This revised proposal was developed after correspondence with Mr. Chad Dessert, using Meinfelder's current understanding of the site conditions, and is a preliminary understanding of DSS' desires and requirements. We have prepared this proposal based on information usually requested in a workplan by San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD) and the State of California Regional Water Quality Control Board (RWQCB). Kleinfelder is committed to providing quality service to our clients, commensurate with their wants, needs, and desired level of risk. If a portion of this proposal does not meet the needs of DSS Company, or if those needs have changed, Kleinfelder will consider appropriate modifications, subject to the standards of care to which we adhere as professionals. Modifications such as changes in scope, methodology, scheduling, and contract terms and conditions may result in changes to the risks assumed by you, as well as adjustments to our fees. We look forward to the opportunity to serve you. BACKGROUND DSS proposes to mine gravel at their Tracy facility, and is limited to mining above the groundwater table. Based upon a letter from PHS/EHD, DSS was requested to submit a groundwater-monitoring plan for the proposed gravel pit area for their review and approval. According to the PHS/EHD letter "The plan shall address overdraft, perched water, flow patterns, and possible changes to water quality." Kleinfelder contacted Mr. Ray Borges of the PHS/EHD for additional information. Mr. Borges indicated that three deep production/irrigation wells at and in the near vicinity of the DSS gravel pit could be used to assess groundwater elevation, flow and gradient and groundwater quality to comply with PHS/EHD request. However, Mr. Borges noted some concern over the validity of the proposed groundwater sounding data based on potential influence by the Delta Mendota Canal. The closest well (Well No. 3/Plate 1), according to Mr. Dessert, is about 350 feet east of the canal and the uppermost- screened interval is at a depth of approximately 240 feet. Static water level of groundwater was reported by DSS to be at an approximate depth of 145 feet below existing ground surface. Kleinfelder understands the Delta Mendota Canal is lined with concrete, but that leakage from the canal may occur. However based upon the distance of the nearest well to the canal and the 's i 20-YPO-212R/2000P291/200OW027 Page I of 7 August 16,2000 0 2000 Kleinfelder,Inc.