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i C A M B R I A event (by EPA Method 8020) indicate that the:MTBE previously detected may not be persistent in groundwater. To clarify this issue, future MTBE analyses will be performed by EPA Method 8260. • Investigations for the former Chevron Station located upgradient of the subject site indicate that there are several water-bearing zones in this area and that there may be a downward vertical gradient between these zones. • An operating City of Lodi municipal well (Well 12) is located in the southwest corner of the property. It is Equiva's objective to fully assess the extent of petroleum hydrocarbon constituents found near the northern dispensers and to verify that Well 12 was not impacted by Equilon's operations at this site. Work Tasks Permits: As discussed with Harlin Knoll of SJCPHS/EHD, permit No. 0024476 may be used for this expanded scope of work provided the work remains onsite and Gregg Drilling is the contractor. As mentioned above, an access agreement is being negotiated with the subject site property owners. Site Safety Plan: A Site Safety Plan will be prepared for field work. Utility Clearance: Proposed drilling locations will be ,marked and their locations cleared through Underground Service Alert prior to drilling. Site Investigation: As discussed above, Cambria will develop well MW-8 and sample wells MW-5, MW-6, and MW-8 as soon we are granted access to the subject site, in accordance with our approved October 23, 2000 Site Investigation Work Plan. We will also install, develop, and sample well MW-7 once we have site access and a driller is available. This work is currently scheduled for December 29, 2000. Two cone penetration test (CPT) soil borings (CPT-1 and CPT-2) are proposed as shown on Figure 2. 'A Cambria geologist will supervise the drilling, and encountered soils will be logged continuously using electronic CPT technology. These logs will identify deeper water-bearing zones beneath the site. The borings will be advanced until we encounter the significant clay layer identified in Well 12's boring log at 136 fbg, unless we encounter refusal at a shallower depth. No soil or groundwater samples will be collected. This work is tentatively scheduled for January '17, 2001. 1346 3