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F~ C� I�I � <br /> i ENVIROWAIEN r HEALTH <br /> Date 1° <br /> �c A111T <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 5469 Address 130 South Wilson Way, Stockton, California <br /> ARCO Environmental Engineer Don Pratt <br /> Consulting Co/Contact Person Stratus Environmental, Inc 1 Jay R Johnson, P G <br /> Consultant Project No U5469-14-4 <br /> Primary Agency/Regulatory ID No Nuel Henderson, P G , San Joaquin County Environmental Health <br /> Department 10710 <br /> WORK PERFORMED THIS QUARTER(First 2006) <br /> 1 Stratus collected depth to groundwater measurements and groundwater samples from monitoring <br /> wells MW-1 through MW-13 (Figure 2) on March 6, 2006 <br /> 2 Stratus complied and evaluated groundwater monitoring data for the ARCO site Quarterly monitoring <br /> data for two additional UST sites located in close proximity to the ARCO property (the former Top <br /> Filling Station, 101 South Wilson Way, and the Knowles-Roek property, 102 South Wilson Way)were <br /> also evaluated <br /> 3 Stratus directed the installation of monitoring wells MW-11 through MW-13 on February 13 and 14, <br /> 2006 <br /> 4 A Stratus technician visited the site six times (between January 10, 2006 and March 21, 2006) to <br /> conduct operation and maintenance of the ozone infection system, and to collect field and laboratory <br /> parameter measurements as identified in the monitoring plan <br /> WORK PROPOSED FOR NEXT QUARTER(Second 2006) <br /> 1 Quarterly groundwater monitoring and sampling will be conducted jointly with consultants representing <br /> the former Top Filling Station and Knowles-Roek property sites The next sampling event is <br /> tentatively scheduled for June 2006 <br /> 2 Groundwater samples will be collected from monitoring wells MWA through MW-13 and analyzed for <br /> gasoline range organics (GRO), benzene, toluene, ethylbenzene, total xylenes (BTEX), tertiary butyl <br /> alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPS), ethyl tertiary butyl ether <br /> (ETBE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and ethanol using USEPA <br /> Method 82608 <br /> 3 Bi-monthly site visits will be conducted to verify operation of the ozone injection system and to conduct <br /> maintenance, if warranted In addition to the quarterly sampling, additional groundwater samples will <br /> be collected from MW-1, and MW-4 through MW-10 on a quarterly basis and analyzed for chemical <br /> oxygen demand (COD) using USEPA Method 410 4, total iron using EPA Method 200 7, and <br /> heterotrophic plate count using SM9215B <br /> 4 Stratus prepared and submitted a Well Installation Report on April 7, 2006, documenting the <br /> installation of wells MWA 1 through MWA 3 <br /> Current Phase of Project Monitoring 1 Interim Remediation <br /> • Frequency of Groundwater Sampling All Monitoring Wells=Quarterly <br /> K\Bp-Arco For URS\5469\Quarterly\2006\Arco_5469_1Q06 docPage 2 of 6 5rRAru5 <br />