SITE INFORMATION AND CORRESPONDENCE

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STATE Cf CALIFORNIA ! a GEORGE DEUKMEJIAN Governor CALIFOrINIA REGIONAL WATER QUALITY CONTROL BOARD— v CENTRAL VALLEY REGION _� ~ 3443 ROUTIER ROAD SACRAMENTO,CA 95827-3098 20 March 1987 Mr. Steve Woodruff Chevron Pipe Line Company 555 Market Street San Francisco, CA 94120 ALDEN PARK, SAN JOAQUIN COUNTY I have reviewed the "Field Investigation for Phase II Site Assessment" work plan for the subject site. Since the objective of the work plan is to locate the suspected subsurface, concrete, slab beneath Alden Park and evaluate contamination of local soils and ground water resulting from the slab's history, we, for the most part, agree with the proposals presented in the work plan. There are some changes that must be made before our full approval of the plan can be given. We do not foresee these changes holding up initial progress of the work plan. If appropriate changes are agreed upon, the entire work plan may proceed close to the time table you have indicated. As was agreed upon at our 20 January 1987 meeting, the residential soil sampling described in the work plan was to begin prior to submittal of the subject work plan. I understand as of 9 March 1987 this task was nearing completion. So that work may continue uninterrupted, we will allow the probing for the concrete slab to begin, if, as agreed during our phone conversation of 16 March 1987, the slabs elevation and slope relative to the ground elevations are surveyed and documented while probing. Verification of the Polynuclear Aromatics (PNAs) and volatile organics detected in earlier soil samples (see Kennedy/Jenks/Chitton October 1986 report) has not been addressed in the subject work plan. As we discussed at our 20 January 1987 meeting, additional soil samples should be collected from Alden Park to determine if the presence of PNAs detected at boring B-11H is confined to the sampled area, or is more extensive. Samples should also be collected from areas where methylene chloride and chloroform were detected to confirm their presence in soil , and that they were not introduced from laboratory sources. If the presence of these chemicals is confirmed, their extent should be defined by additional soil sampling. This soil sampling may be implemented immediately, as long as local requirements are adhered to. The results of the soil samples should be summarized in the Final Report.