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' Mr Mark Gilmartin,Attomey September 24, 1998 MonEgomery Ward Auto Center,Stockton,CA Page 4 conditions and appropriate actions that will be taken to avoid cross-contamination between boreholes and between the various aquifer zones Suhtask S 2---Well Construction Fluor Daniel GTI will implement traffic control, drilling, soil sampling, well construction, and well development in accordance with the Work Plan Analytical costs for waste characterization are included Upon receiving the analytical data, Fluor Daniel GTI will recommend to you and your client the most cost-effective way to dispose of the derived wastes Upon request, Fluor Daniel G TI will provide costs and assist Montgomery Ward in disposing of these wastes Soil samples will be submitted to a State-certified laboratory for analysis using standard turnaround time Suhtasti 5 3—Well Survey Following installation, the fluor Daniel GTI will use a State-licensed surveyor to locate well boxes and top of casings (foi water level measurements)relative to California State Plane Coordinates and Mean Sea Level The survey will be conducted on existing and newly installed remediation and monitoring wells Cost Savings Another potential cost reduction would be for Fluor Daniel GTI to conduct a post-bid site visit for the well installation subcontractors and ask them to re-submit their estimates based on the site information We have competitively bid this task, but believe the subcontractors' costs could be reduced if they were more familiar with the site Task 6 Trenehirig and Piping Installation Pin Based on the Design Drawings provided in Figure 13 of the CAP, it is estimated that approximately 580 linear feet of trench will be excavated for the installation of the piping/conduit Fluor Daniel GTI assumes that no trench plates will be required and that no delays will be incurred due to site operations Fluor Daniel GTI will supervise a subcontractor who will perform the trenching, piping, pressure testing, backfilling, compaction, and compaction testing The pressure testing of all piping will be conducted on a section by section basis Pressure testing will consist of isolating the various pipe sections and applying 50 pounds per square inch (psi)of pressure for a period of at least six hours Trenches shall be excavated to 2 feet bgs for piping placement Where suitable, excavated material may be used as backfill material in the trenches At l% feet bgs conduit warning ribbon will be buried before completing trench backfill and compacting to finished elevation The trenches will be completed as follows, giving precedence to City of Stockton directives or permit requirements ■ Place and compact suitable backfill material in 12-inch lifts ■ Remove slough, compact subgrade (as necessary), and fill material to a minimum of 95% relative density to within the top 6 inches of final subgrade The top 6 inches of subgrade shall be compacted to a minimum of 95%relative density ■ Use backfill placement methods that do not disturb or damage existing utilities or structures a Compact backfill placed within 3 feet of existing structure foundation using light mechanical compaction equipment MGWCAP5[7 WPD FLUOR DANIEL GTI 4