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1 <br /> „ Stockton City Taxi Company June 2$, 2004 <br /> 2085 E. Fremont Street, Stockton, California <br /> Quarterly Groundwater Sampling Report <br /> April, 2004 <br /> ' Summary of Analytical Findings <br /> ' This quarter, detectable contamination levels were identified in the monitoring wells <br /> listed below: <br /> 1 <br /> Well TPH- B T E X MTBE ETH BTA DIPE ET13E TAME EDB 1,2- <br /> ' Gas* DCA <br /> MW-1 157' 6;220 34600 3 220 ,.19 0- . ND ND ND ND ND ND ND : 663 <br /> MW-2 `_13 .." 1;420•_, 1;200 X156: '' 1;$70 122 ND ND ND ND ND ND -255 <br /> MW-3 187, : "4 T`,.:':' 7.6 1' 3 , ; 6i6:' = .13=- ND ND ND ND ND ND z 951, <br /> ' MW-4 0:74 38 4:_ 52 --'6,0, 41.•;;" , =:,7.8. ND ND ND ND ND ND <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 Dibromide <br /> 10 1,2-DCA— 1,2-Dichloroeffime <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 154 mg/L of gasoline, a slight increase since last quarter's <br /> monitoring event in which MW-1 contained 144 mg/L of gasoline. However, the <br /> concentrations of Benzene, Toluene, Xylene, and 1,2-DCA decreased since last quarter's <br /> ' monitoring event in January, 2004. A slight increase in Ethyl-Benzene was observed in <br /> MW-1 this quar(er. MW-2 showed slight increases in the concentration of gas, benzene, <br /> xylenes, and MTBE. Slight decreases in the concentrations of toluene, Ethyl-Benzene <br /> ' and 1,2-DCA was also observed. MW-3 showed decreases in all contaminants except for <br /> slight increases in the concentration of MTBE and 1,2-DCA. The concentrations of all <br /> ' contaminants in MW-4 have decreased since last quarter's monitoring event. The <br /> concentrations of Benzene and MTBE found in the water samples collected from this site <br /> are significantly above the State Allowable Limits. Appendix A contains the laboratory <br /> analytical data and Chain of Custody report. <br /> The monitoring wells will be measured, purged and sampled again next quarter, and a <br /> ' new gradient calculated. <br /> • <br /> ' 2 <br />