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.ti <br /> • Date _ A2ril 26, 2002 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 5469 Address: 130 South Wilson Way, Stockton, California <br /> ARCO Environmental Engineer: Paul Su le <br /> Consulting Co./Contact Person: Delta Environmental Consultants, Inc. l Jay R. Johnson <br /> Consultant Project No: D000-336-3 <br /> Primary Agency/Regulatory ID No: Rebecca Setliff, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 2'002): <br /> 1. Groundwater samples were collected from monitoring wells MW-1 through MW-10 and submitted for <br /> laboratory analysis. <br /> 2. Delta compiled and evaluated groundwater monitoring data. <br /> 3. Delta submitted Work Plan for Additional Site Assessment and Interim Remediation/Feasibility Testing <br /> on March 4, 2002. <br /> 4. Delta retained Woodward Drilling Company of Rio Vista, California to drill and install five ozone <br /> injection wells (IW-1 through IW-5) on March 25 and 26, 2002. <br /> WORK PROPOSED FOR NEXT QUARTER(Second 2002): <br /> 1. Quarterly groundwater monitoring and sampling will continue at the site. The next sampling event is <br /> tentatively scheduled for May 2002. Groundwater samples will be collected from monitoring wells <br /> MW-1 through MW-10 and analyzed for total petroleum hydrocarbons as gasoline (TPHG), benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX) using USEPA Method 8015/8020 DHS LUFT, and for <br /> tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary <br /> butyl ether (ETBE), tertiary amyl methyl ether (TAME), 1,2-Dichloroethane (1,2-DCA), and ethylene <br /> dibromide (EDB) using USEPA Method 8260. <br /> 2. An access agreement will be forwarded to the property owner east of the ARCO facility. <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: All Monitoring Wells= Quarterly <br /> Frequency of Groundwater Monitoring: Quarterly — <br /> Sampling Date: February 21, 2002 <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: 39.80 to 40.65 feet bgs <br /> Groundwater Flow Direction: Variable,generally towards the east-northeast with <br /> variations in flow direction to the north,west,and <br /> south-southeast <br /> Groundwater Gradient: 0.0026 (north)to 0.0064(south-southeast)ft/ft <br /> P:\ARCO\5469\Quarterly\2002\ALreo-5469-1 Q02.doe Delta <br />