Laserfiche WebLink
i <br /> 0 Date January 25, 2005 <br /> ARCO QUARTERLY 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 Stratus Environmental, Inc /Jay R Johnson, R G <br /> Consultant Project No U5469-14-4 <br /> Primary Agency/Regulatory ID No Nuel Henderson, R G I San Joaquin County Public Health <br /> Services/Site Code 0710 <br /> WORK PERFORMED THIS QUARTER(Fourth 2004) <br /> 1 Stratus monitored groundwater elevations and collected quarterly groundwater samples from <br /> monitoring wells MW-1 through MW-10 (Figure 2) on December 9, 2004 <br /> 2 Stratus technician(s) visited the site six times (between October 11, 2004 and December 23, 2004) to <br /> conduct operation and maintenance of the ozone injection system and to collect field and laboratory <br /> parameters as identified in the monitoring plan for operation of the ozone infection system <br /> 3 Stratus complied and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER(First 2005) <br /> 1 Quarterly groundwater monitoring and sampling will continue at the site The next sampling event is <br /> tentatively scheduled for March 2005 <br /> 2 Groundwater samples will be collected from monitoring wells MW-1 through MW-10 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 (DIPE), ethyl tertiary butyl ether <br /> (ETBE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and ethanol using USEPA <br /> Method 8260B <br /> 3 Stratus will continue to operate and maintain the ozone infection system In addition to the quarterly <br /> sampling, additional groundwater samples will be collected from MW-1, MW-4 through MW-10 on a <br /> quarterly basis and analyzed for chemical oxygen demand (COD) using USEPA Method 410 4, total <br /> iron using EPA Method 200 7, and heterotrophic plate count using SM9215B <br /> Current Phase of Project Monitoring/Interim Remediation <br /> Frequency of Groundwater Sampling All Monitoring Wells =Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date December 9, 2004 <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 45 17 to 45 79 feet below ground surface (bgs) <br /> Groundwater Flow Direction Radial <br /> K\Bp-Arco for URS\5469\Quarterly\2004\Arco_5469_4QQ4 doc, 5rRATU3 <br />