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C A M B R I A <br /> # DISCUSSION OF PREVIOUS WORK PLANS <br /> October 23, 2000 Work Plan: Cambria began implementing this work plan in <br /> November 2000. During this investigation, an issue regarding our access to the property was <br /> brought to our attention and, at the request of property owners' counsel, our work was <br /> immediately halted. Prior to discontinuing the field work, wells MW-6 and MW-8 were <br /> installed. Proposed well MW-7 was not installed, and as we discussed during our <br /> February 22, 2001 meeting, this proposed well will not be installed. Well MW-8 was <br /> developed on March 12, 2001 and wells MW-5, MW-6, and MW-8 were sampled on March <br /> 16, 2001. These results will be submitted under separate cover. <br /> December 18, 2000 Work Plan: Cambria proposed drilling two cone penetration test (CPT) <br /> borings to log soil types and installing a minimum of one monitoring well screened in the <br /> second water-bearing zone. .Data from the two most recent quarterly monitoring events from <br /> well MW-5 suggest that the MTBE initially detected in groundwater may have resulted from <br /> drilling activities. It is probable that, in the course of drilling the well boring, a limited <br /> amount of MTBE impacted soil was brought into contact with groundwater. If this is the <br /> case, we would expect the MTBE concentrations in this well to rapidly decrease to non- <br /> detect levels, as we have seen in well MW-5. Therefore, it is Equiva's position that <br /> petroleum constituent impact is limited to shallow soil near the northernmost dispenser <br /> island, and installation of a deep monitoring well is not warranted. Instead, Cambria proposes <br /> drilling one CPT boring to log soil types and a second CPT boring to collect a deep <br /> groundwater sample. These and additional proposed activities are discussed in detail below. <br /> REVISED WORK PLAN <br /> Permits: As discussed with Harlin Knoll of SJCPHS/EH.D, permit No. 0024476 may be used <br /> for this expanded scope of work provided the work remains onsite and Gregg Drilling is the <br /> contractor. We anticipate that these conditions will be met. Equilon has obtained an access <br /> agreement with the subject site property owners. <br /> Site Safety Plan: A Site Safety Plan will be prepared for field work. <br /> Utility Clearance: Proposed drilling locations will be marked and their locations cleared <br /> through Underground Service Alert prior to drilling. <br /> 1346 3 <br />