ARCHIVED REPORTS_XR0008564 - Laserfiche WebLink

Home Browse Search

Third Quarter 2003 Groundwater Monitoring Report Eckert Cold Storage,Manteca,California October 14,2003 Page 3 • LABORATORY ANALYTICAL RESULTS The groundwater samples collected from monitor wells MW-4, MW-8, and domestic well DW-1 were analyzed for BTEX, TPH-G, and selected gasoline oxygenates/additives including MTBE by Argon Laboratories of Ceres, California. Monitor well MW-2 was not sampled as damage to the well casing during installation of the well prevents the placement of pumps and bailers down the well. Monitor wells MW-5 and MW-7 are sampled annually in the fourth quarter. Monitor wells MW-1, MW-3, and MW-6 are no longer sampled.This reduction in sampling was approved by Mr. Harlin Knoll of SJCEHD in a fax dated March 21, 2003. The current laboratory analytical results, shown in Table 2, below, are generally consistent with historical laboratory analytical results. Historical groundwater monitoring data are included in Attachment C. Laboratory certificates of analyses and the chain-of-custody for the samples are included in Attachment D. Table 2 —Groundwater Sample Laboratory Analytical Results (September 2 and 3, 2003) GASOLINE OXYGENATES/ADDITIVES B T E X TPH-G MTBE Other Gasoline Oxygenates/Additives Units: }ig/L µg/L Ag/L µg/L mg/L µg/L Pg/1- Analytical g/LAnalytical Method: • 8260B 8260B 8260B 8260B 8015M 82608 8260E Sample I.D. 3471-MW4-9/2/03 <0.5 <0.5 <0.5 <1.0 <0.05 1.5 4.1(1,2-DCA) 3471-MW8-9/3/03 330 5.3 120 51 4.0 21 96(TBA) 3471-DW-9/2/03 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5—<5.0 Units: Analytical: mg/L:milligrams per liter,parts per million(ppm) B,T,E,X=benzene,toluene,ethyl benzene,total xylenes g/L:micrograms per liter,parts per billion(ppb) TPH-G=total petroleum hydrocarbons quantified as gasoline Gasoline oxygenates/additives= methyl tertiary butyl ether(MTBE),ethanol, tertiary-butanol (TBA), di-isopropyl ether (DIPS), ethyl tertiary butyl ether (ETBE),tertiary amyl methyl ether(TAME), 1,2-dibromoethane(EDB), 1,2- dichloroethane(1,2-DCA) = all other oxygenates/additives were not detected at or above the laboratory reported detection limits FUTURE WORK/RECOMMENDATIONS The SJCEHD has indicated that continued quarterly groundwater monitoring is required at the site. The next quarterly monitoring event is scheduled for December 2003. This will be the annual monitoring event and will include sampling of monitor wells MW-5 and MW-7 in addition to the quarterly sampling of monitor wells MW-4, Iv1W-8, and the domestic well DW-1. i �.1� CONDOR