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Mr. Harlin Knoll SJCPHS February 1, 1993 Page 2 Based upon the above results, it is recommended that tank pit excavation backfilling proceed in the following manner: 1). Approximately 1,200 cubic yards of fill material unrelated to the tank excavation exist on .site. This soil is from recent new sewer transmission line construction across the northern portion of the site. This soil will be.placed in the excavation first. 2) The 1,200 cubic yards of soil from the excavation that has been:characterized through soil sampling as exhibiting no detectable concentrations of TPN-as-gasoline, -diesel or BTEX will be placed in the excavation next. 3) The tank pit backfilling will be completed using soils which exhibit TPH-as-diesel -- concentrations.above the MDL but less than 50 mg/kg: Not all of the soil that is characterized by these diesel concentrations will likely be needed. An effort will.be made to start with the lowest concentration soils. 4) The soil exhibiting diesel concentrations above 50 mg/kg (1,100 yards) will be moved to the northern portion of the facility and placed on bermed plastic-sheeting for uncontrolled aeration/bloremediation, as specified in the July 30, 1992 Work Plan for- Characterization and Remediation of Stockpiled Soils. 5) The disposition of residual soil from the < 50 mg/kg category, which is not needed for tank pit backfilling, will be proposed to SJCPHS when the exact volume of soil is known. However,we would propose that the soil be spread out on site. We trust this plan meets with your approval. Upon receipt of written approval to proceed from SJCPHS, the tank excavation backfilling will be scheduled. if you have any questions or comments, please.call either Mr. Dean Willis of O'Melveney & Myers at-(213) 669-6210 or me at (510) 671-2387. Sincerely, GROUNDWAT TEC L GY, INC. Richard M. Thomasser Project Manager E Hydrogeologist '4 cc: Ms. Elizabeth Thayer, RWQCB Central Valley Region Dean Willis, Esq., O'Melveney & Myers 'Mr. Larry Chapman, Manna Pro Corporation RTMPSDP.1 GROUNDWATER TECHNOLOGY,INC.