SITE INFORMATION AND CORRESPONDENCE FILE 2

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�I Tosco/BP# 11192 page 2 1403 Country Club Blvd.,Stockton. 2) At the conclusion of the two month period,PHS-EHD will evaluate the effectiveness of the interim remedial action. The data in the weekly submittal will aid in the evaluation of whether or not this pumping action will qualify as a valid,appropriate,and effective alternative for the feasibility study. If the data support conclusions the that pump and disposal method is effective in reducing the mass and migration of MtBE in the groundwater,PHS-EHD will provide Tosco/BP with written approval to continue weekly pumping of 5,000 gallons of groundwater at the site. If the data fail to support conclusions that the pump and disposal method is effective in reducing the mass and migration of MtBE in the groundwater,PHS-EHD will recommend that the interim remedial action be discontinued. Moreover,in the event that PHS-EHD directs Tosco/BP to discontinue the pump and disposal remedial action and Tosco/BP ignores the direction and continues the action,PHS- EHD will recommend to the State Water Resources Control Board (SWRCB) Clean-Up Fund(CUF) that the interim remedial action be exempted from reimbursement of costs. 3) PHS-EHD recommends that additional analysis be conducted on the stored 5,000 gallons in order to verify the amount of MtBE removed from the subsurface. In February 1998,the depth to water rose above the screened interval of all monitoring wells associated with this site and remains in this condition currently. Additional monitoring wells are to be installed so that the screened interval overlaps the groundwater/vadose interface. With elevated concentrations of MtBE in all analyzed monitoring wells and the highest concentration in the most down-gradient wells,(#3 &7) this site's subsurface condition is not accurately represented,properly investigated,or laterally defined. Therefore,Tosco/BP is hereby directed to submit a work plan by January 5,2001 to delineate the MtBE groundwater plume. Evidence that the UST system has been completely inspected and the source of the MtBE impact to the groundwater has been identified and abated must be submitted to PHS-EHD as well. Additionally, an accurate and current site map showing all traffic boxes and current site lay out is to be submitted to PHS-EHD by January 5,2001. Complete boring permit applications and associated fee,any and all County/City encroachment permits,and any private property access agreements are to be included with the work plan. It is the intention of PHS-EHD to require that the subsurface investigation and active remediation of this site be completed in a timely manner. Tosco/BP is to aggressively identify,contain,and mitigate the petroleum contamination and MtBE plume immediately. Due at PHS-EHD within a very short period of time is the report of additional monitoring well installations,a Problem Assessment Report(PAR) immediately after the plume has been laterally and vertically defined,and a Feasibility Study that presents field data for at least two (2) alternatives for effectively returning the groundwater beneath the site to its beneficial use. Please continue to submit your correspondences to Michael Infurna and you may contact him at(209)468- 3454 should you have any questions or wish to discuss the site. Donna Heran,RENS,Director Envir ental Health Division Michael J.Infua Jr.,Semi r RENS Dot Lofstrom m Site Mitigation Unit IV/LOP Registered Geologist,Unit IV MI/ c: Gettler Ryan- Doug Lee,6747 Sierra Ct.,Ste J.,Dublin,94568. c: CVRWQCB —Marty Hartzell,Sacramento.