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August 14, 1995 Project 2560-203.01 Mr. Don O. Culbertson Chevron Pipe Line Company 4000 Executive Parkway, Suite 400 San Ramon,California 94583 Re: Addendum to Work Plan for Site Assessment, Old Valley Line, Mile Post 215,Tracy Dear Mr. Culbertson: This work plan addendum was prepared to address comments in a July 26, 1995 letter by the Regional Water Quality Control Board (RWQCB) to the Work Plan for Site Assessment, Old Valley Line, Mile Post 215, Tracy prepared by EMCON. The first response below addresses a misinterpretation of the work plan. The remainder of the responses address comments on the work plan. Response to Comments On page 2 of the COMMENTS ON WORK PLAN FOR PHASE II REMEDIAL INVES77GATION, MOUNTAIN VIEW TOWNHOMES, TRACY, SAN JOAQUIN COUNTY by the RWQCB under WORK PLAN PROPOSAL, Soil, which summarizes EMCON's work plan, it states: "Geoprobe soil samples will be analyzed for total extractable petroleum hydrocarbons (TEPH) by modified EPA Method 8015, for aromatic VOCs by EPA Method 8020, and for PNAs by EPA Method 8310." The work plan states that all geoprobe soil samples submitted for chemical analysis will be analyzed for total extractable petroleum hydrocarbons as crude (TEPH) by U.S. Environmental Protection Agency (EPA) method 8015 modified (m) and for benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA method 8020. Only one soil sample collected from each geoprobe boring will be analyzed by EPA method 8310. An additional Geoprobe boring should be placed between Areas 4 and 7 to ensure adequate representation of the site along the pipeline. Three geoprobe sites completed in the vicinity of Area 4 should be sufficient to characterize soils and groundwater around Area 4. One of the borings originally proposed for Area 4 will be moved to the northwest between Areas 4 and 7.