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Mr Don Rodgers Proposal P96-050 31 . May 14, 1996 Page 2 BACKGROUND The subject property is located in a commercial area and is currently being used as a transmission repair shop The site was historically used as a retail service station, with gasoline dispensing activities ceasing sometime in the 1950s The release from the UST(s) was discovered during the drilling of a monitoring well near the former tank pit area in October 1993 PROJECT APPROACH The objectives of the field work are to (1) delineate petroleum hydrocarbons in soil and groundwater, (2) perform feasibility studies, if warranted, (3) prepare a CAP, and (4) perform one year of quarterly groundwater monitoring and reporting To accomplish these objectives, EMCON proposes drilling 3 soil borings and installing 1 groundwater monitoring well Because groundwater monitoring wells exist downgradient (ARCO Well MW-6) and cross gradient (Chevron monitoring well) from the former UST(s) and the relatively small • size of the property, it is EMCON's opinion that the groundwater beneath the site can be characterized with the installation of one monitoring well The well will be used to characterize groundwater upgradient of the former UST(s) Two borings will be drilled near the former UST(s) and the other boring will be drilled at the north end of the property to assess the soil beneath observed surface staining In the event that hydrocarbons are detected in soil samples collected from the soil borings, selected soil borings may be converted to vapor extraction wells The vapor extraction wells will be used to perform a soil vapor extraction (SVE) test, if warranted If additional soil bonngs, vapor extraction wells, etc are needed to complete the investigation, specific unit tasks, contained in this proposal, can be implemented during field operations, with the authorization of Mr Rodgers Table 1 summanzes the estimated budget for the proposed scope of work, Table 2 provides a detailed breakdown of the estimated budget, and Table 3 presents costs associated with optional unit tasks which are not included in the estimated budget SCOPE OF WORK EMCON has prepared the following scope of work to complete the requirements associated with the project objectives All work will be performed following California Regional Water Quality Control Board's (CRWQCB) Tri-Regional Guidelines Based on a site visit, the former tank cavity has not been entirely backfilled Before EMCON can implement the following scope of work, the tank pit should be completely backfilled In SACK 1P96-050 31-95tidros 1