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swof <br /> Revised Proposal and Estimated Budget No. P15362.00 <br /> Ekholm Property, Escalon, CA <br /> • Task 3. Backfill and Compact Former Gasoline Tank Excavation <br /> • Task 4. Drill/Install 3 Vapor Extraction Wells and 3 Monitoring Wells <br /> 0 Task 5. Survey, Develop and Sample Monitoring Wells <br /> 0 Task 6. Conduct a One Day Vapor Extraction Test (VET) <br /> 0 Task 7. Preparation of Summary Report <br /> Task 1. Preparation of Workplan <br /> This task includes preparation of a workplan for submittal to San Joaquin County Public Health <br /> Services (SJCPHS) and the California Regional Water Quality Control Board (RWQCB) for their <br /> review and approval. The workplan will provide a project description and outline the field <br /> methods and procedures that will be employed to complete tasks 2 through 6, as described <br /> below. <br /> Task 2. Held Work Preparation and Permitting and Modification of Site Safety Plan <br /> This task includes scheduling of field personnel and equipment; obtaining appropriate permits, <br /> if necessary; modifying the present Site Safety Plan to include all additional field activities; and <br /> other field preparation and job start-up activities. <br /> Task 3. Backfill and Compact Former Gasoline Tank Excavation <br /> RESNA proposes to backfill the existing open excavation from the removal of the gasoline <br /> storage tanks. Stockpiled soil originally excavated from the pit and additional clean fill will be <br /> placed into the excavation and compacted to 90% compaction. Subsequent to compaction the <br /> backfilled pit will be covered with a relatively impermeable asphalt layer to mitigate any surface <br /> runoff which may promote downward migration of petroleum hydrocarbons. Costs for asphalt <br /> have not been included due to the problems associated with estimating quantity of asphalt needed <br /> at this stage. <br /> A total of one hundred cubic yards of self-compacting fill will be imported to the site for <br /> placement into the former gasoline tank excavations. In the event that additional clean fill is <br /> needed, it will be charged to the client on a time and materials basis. <br /> Task 4. Drill and Install 3 Vapor Extraction Wells and 3 Monitoring Wells <br /> Under this task, work performed would include: scheduling of equipment; other field preparation <br /> activities such as location of underground utilities; mobilization to the site; advance three soil <br /> borings and complete them as three vapor extraction wells; covering the drill cuttings and <br /> cleaning-up the site; demobilization. <br /> Fkhohn Proposal Disk ' <br /> P362-REV-2 2 <br />