SITE INFORMATION AND CORRESPONDENCE

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guidance agency's concurrence on the recommended remedial action, a work plan and cost estimate will be prepared by the CONSULTANT for the implementation of the remedial action at Bixler Yard. TASK 5C: PRELIMINARY EVALUATION OF REMEDIATION OPTIONS - STOCKTON YARD Based on the results of Task 3C, the CONSULTANT will prepare a report identifying remedial action objectives and evaluating remedial technologies for Stockton Yard. This evaluation will examine remedial technologies and will screen these technologies based on feasibility, effectiveness, and cost. It is assumed that the soils at Stockton Yard have not been impacted by the identified contaminants of concern. After the initial screening, the remaining technologies will be combined to form different remedial alternatives that will satisfy the remedial objectives for the site. Each alternative will be evaluated to determine its feasibility, effectiveness, and cost relative to the other alternatives. The report will include a recommendation for the most suitable remedial action based on the selection criteria. The CONSULTANT shall submit the report to the DISTRICT for review. Following the DISTRICT's approval, the CONSULTANT shall resubmit the report to the DISTRICT for submittal to the guidance agency for concurrence. Following the guidance agency concurrence, a work plan and cost estimate will be prepared by the CONSULTANT for the implementation of remediation. In accordance with County, State, and Federal guidelines, the CONSULTANT will conduct quarterly monitoring and prepare quarterly monitoring reports for the Stockton Yard site. As noted under Task 3C, quarterly monitoring will begin with the third quarter of 1993, and will continue through the end of 1994. The number of groundwater samples, and the analytes to be monitored will be outlined in the work plan developed under Task 2C, and will be consistent with the requirements of the regulatory agencies. The quarterly monitoring reports will include laboratory data, boring logs, sampling location maps, groundwater gradient maps, and isoconcentration maps for the identified constituents of concern. The reports shall be submitted to the DISTRICT for review, and following incorporation of DISTRICT comments, the reports shall be submitted to the County. As noted under Task 2C, in addition to the quarterly monitoring requirements, the CONSULTANT will identify the performance verification groundwater monitoring requirements that will be used to ensure that the remedial action is meeting the remedial 93P4 EBMUD-Brentwood, Bixler Yard,and Stockton Yard 90570413.d 10 Exhibit A-Scope of Services