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r Chevron Chevron May 20, 1994 MAY .2 5 A994 Chevron Research and Technology Company ENVIRONMENTAL HEALj" 1003 West Cutting Boulevard City Of Tracy PERM PO. Richmond,California R0.Box 4054 Department of Public Works Richmond,CA 94804-0054 520 Tracy Boulevard Tracy, California 93576 Health,Environment&Safety Attention: Mr. Kuldeep Sharma, P.E., Deputy Director of Public Works Coordination of Sewer Line Construction Work and Remediation Activities at the Intersection of Grant Line and Corral Hollow Roads Mr. Sharma: As we discussed during our telephone conversation today, Chevron Pipe Line Company (Chevron) is concerned about the potential negative impact dewatering may have on control of hydrocarbon-containing groundwater located on the north side of Grant Line Road. Our preliminary assessment of dewatering in this area has indicated that pumping groundwater from dewatering wells located on the south side of Grant Line Road has a high potential reversing the natural groundwater gradient and drawing hydrocarbon- containing groundwater across the roadway. The movement of groundwater in this direction, even for a short period of time has the potential for complicating our planned remediation efforts and strategy. Since we do not want to delay the plans the City has for construction in this area, Chevron would like to work with the City to both alleviate your concerns related to encountering hydrocarbon-containing soil and groundwater and our concerns related to movement of the_groundwater. To do this, Chevron proposes concurrent dewatering on the north side of the roadway while the City conducts it dewatering, excavation, and construction on the south side of the roadway. Chevron will assume the costs of its activities on the north side of the road. In order to make this work successful Chevron requests that the City: 1) specify in the bid award letter that its contractor must work with Chevron when planning these activities; and, 2) permit and supply Chevron access to the Publicly-Owned Treatment Works (POTW) to dispose of the extracted groundwater (subject to the appropriate regulations).