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CAMBRIA TECHNICAL RATIONALE FOR PROPOSED SCOPE OF WORK • Three soil borings were previously proposed (August 28, 2003 work plan) on the 2491 East Fremont Street property north of the subject site. We were not able to obtain an access agreement with the property owner to complete the proposed work in the property and the proposed borings were not drilled. Subsequently we learned that the property was formerly occupied by a service station from some time prior to 1960 through at least 1973. This information was obtained through Polk City Directories research and verified by aerial photos of the site vicinity. The former service station layout is shown on Figure 2 as inferred © from the aerial photographs. • Based on this new information, Cambria, on behalf of Shell, suggested that the owner of the property at 2491 East Fremont should investigate their property themselves, particularly in light of the fact that the highest concentration of lead scavengers from the November 2002 subject site investigation were detected adjacent to the 2491 East Fremont Street property. EHD did not accept Cambria and Shell's reasoning and requested Shell install wells north of the subject site. • Based on this request from EHD, we have altered our scope of work as follows. Cambria proposes installing two additional shallow zone wells to monitor groundwater conditions and two exploratory borings to assess soil and groundwater conditions north of the subject site. These wells are proposed on the 2491 East Fremont Street property(Figure 2). • Based on the findings of this phase of investigation (and subsequent groundwater monitoring events), additional phases of investigation, if warranted, will be proposed. If it is evident that there is a source of contamination at the 2491 East Fremont Street property, Cambria and Shell will again suggest that the owner of that property conduct their own investigation. WORK TASKS Permits: Cambria will obtain a drilling permit from EHD for the 2491 East Fremont Street property. An access agreement will again be requested from the property owner of the 2491 East Fremont Street property. EHD will be copied on this request. If an executed access agreement can be obtained, it will be forwarded to EHD for their records. If the owners of 2491 East Fremont Street will not sign an access agreement with Shell, EHD has indicated they will assist us in obtaining their cooperation.