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' Stockton City Taxi Company March 5, 2004 <br /> 2085 E. Fremont Street, Stockton, California <br /> ' Quarterly Groundwater Sampling Report <br /> . January, 2003 <br /> ' Summary of Analytical Findings <br /> ' This quarter, detectable contamination levels were identified in the monitoring wells <br /> listed below: <br /> Well TPH- B T E X MTBE ETH BTA DIPS ETBE TAME EDB 1,2- <br /> Gas* DCA <br /> MW-1 144 10,100 40,600 2,870 19,500 ND ND ND ND ND ND ND 1,060 <br /> MW-2 4.2 510 1,800 220 1,830 109 ND ND ND ND ND ND 259 <br /> MW-3 0.96 5.7 11 2.4 14 9.8 ND ND ND ND ND ND 945 <br /> MW-4 1.5 87 193 1 19 97 1 25 ND ND ND ND ND ND 28 <br /> BTEX—Benzene,Toluene, Ethyl Benzene, Xylenes <br /> MTBE—Methyl Tert-Butyl Ether <br /> ' ETH—Ethanol <br /> BTA—Tert-Butanol <br /> DIPE—Di-Isopropyl Ether <br /> ' ETBE—Ethyl Tert-Butyl Ether <br /> TAME—Tert-Amyl Methyl Ether <br /> EDB—Ethylene Dibrornide <br /> 1,2-DCA— 1,2-Dichloroethane <br /> ND -"None detected"at or above reporting limit <br /> *Reported in mg/L. All other analytes reported in ug/L <br /> This quarter MW-1 contained 144 mg/L of gasoline, a decease since last quarters <br /> monitoring event in which MW-1 contained 165 mg/L of gasoline. However, the <br /> concentrations of Benzene, Toluene, Xylene, and 1,2-DCA increased significantly since <br /> ' last quarters monitoring event in October, 2003. Slight decreases in Ethyl-Benzene and <br /> EDB was observed in MW-1 this quarter. MW-2 showed a decease in the concentration <br /> of MTBE from 14I ug/L to 109 ug/L and in 1,2-DCA from 350 ug/L last October to 259 <br /> ' ug/L. All other chemicals showed an increase since last quarter's monitoring event. The <br /> BTEX constituents exhibited significant increases since last quarter. The concentrations <br /> of gasoline, BTEX and oxygenates in MW-3 has remained relatively constant since last <br /> ' October. Only slight increases were observed in MW-3 this quarter. The concentrations <br /> of chemicals in MW-4 have decreased slightly since last quarter with the exception of <br /> ' 1,2-DCA. 1,2-DCA was not present in the water sample collected last quarter, however <br /> 28 ug/L was present in this quarter's sample. The concentrations of Benzene and MTBE <br /> found in the water samples collected from this site are significantly above the State <br />' Allowable Limits. Appendix A contains the laboratory analytical data and Chain of <br /> Custody report. ( SALs) <br /> r <br />' The monitoring wells will be measured, purged and sampled again next quarter, and a <br /> new gradient calculated. <br />' 2 <br />