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Date Aril 27, 2001 <br /> ARCO QUARTERLY <br /> GROUNDWATER MONITORING REPORT <br /> Facility No: 5469 Address: 130 South Wilson Way, Stockton, California <br /> ARCO Environmental Engineer: Paul Supple <br /> Consulting Co./Contact Person: Delta Environmental Consultants, Inc. 1 Jay R. Johnson <br /> Consultant Project No: D000-336 <br /> Primary Agency/Reguiatory ID No: Lori Duncan, an Joaquin county Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 2001): <br /> 1. Delta submitted a work plan (March 19, 2001) to install two additional onsite groundwater monitoring <br /> wells. <br /> 2. Groundwater samples were collected from monitoring wells MW-1 through MW-6 and submitted for <br /> laboratory analysis. <br /> 3. Delta compiled and evaluated groundwater monitoring data. <br /> WORK PROPOSED FOR NEXT QUARTER(Second 2001): <br /> 1. Once approved by the San Joaquin County Public Health Services, Delta will implement the scope of <br /> work outlined in the March 19, 2001 work plan. <br /> 2. Delta will continue to perform routine quarterly groundwater monitoring on behalf of ARCO. The next <br /> sampling event is tentatively scheduled for June 2001. <br /> 3. Groundwater samples will be collected from monitoring wells MW-1 through MW-6 and analyzed for <br /> total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX) using USEPA Method 8015/8020 DHS LUFT and for tertiary butyl alcohol (TBA), methyl <br /> tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl <br /> methyl ether (TAME), 1,2-Dichloroethane (1,2-DCA), and ethylene dibromide (EDB) using USEPA <br /> Method 8260. <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: All Monitoring Wells=Quarter) <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Sampling Date: March 22, 2001 <br /> Is Free Product(FP) Present on Site: No <br /> FP Recovered This Quarter- NIA <br /> Cumulative FP Recovered to Date: NIA <br /> Approximate Depth to Groundwater: _37.13 to 37.49 feet bac s <br /> Groundwater Flow Direction: East-Southeast <br /> Groundwater Gradient: 0.0015 ft/ft <br /> C:IARCO\54691Quarterly1200I\,5469 Q101 Am Delta <br /> 4127101 <br /> i <br />