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Stockton City Taxi Company August 10, 2004 , 2085 E. Fremont Street, Stockton, California ' Quarterly Groundwater Sampling Report August, 2004 Summary of Analytical Findings This quarter, detectable contamination levels were identified in the monitoring wells listed below: 1 Well TPH- B T E X MTBE ETH BTA DIPE ETBE TAME EDB 1,2- ' Gas* DCA MW-1 156 6,860 33,200 4,310 23,600 ND ND ND ND ND ND ND 903. MW-2 1.4 33 29 ND 21 80 ND ND ND ND ND ND 09"'' MW-3 1.5 3.6 1.1 ND ND 10 ND ND ND ND ND ND 11170- MW-4 1 0.22 4.7 1 9.2 10.8 1 6.4 1 1.7 1 ND I ND ND ND ND ND 3.5 BTEX—Benzene,Toluene,Ethyl Benzene, Xylenes MTBE—Methyl Tert-Butyl Ether ' ETH—Ethanol BTA—Tert-Butanol DIPE—Di-Isopropyl Ether ETBE—Ethyl Tert-Butyl Ether TAME—Tert-Amyl Methyl Ether EDB—Ethylene Dibromide N 1,2-DCA— 1,2-Dichloroethane ND-"None detected"at or above reporting limit *Reported in mg/L. All other analytes reported in ug/L ' This quarter MW-I exhibited decreases in both Toluene and Gasoline but had increased concentrations of Benzene, Toluene, Xylene, and 1,2-DCA. MW-2 showed significant decreases in the concentrations of Benzene, Toluene, Ethyl Benzene and Xylene and showed slight decreases in the concentrations of gasoline, MTBE and 1,2-DCA. MW-3 showed decreases in all contaminants except for a slight increases in the concentration of ' 1,2-DCA from 951 micrograms per liter to 1,170 micrograms per liter. The concentrations of all contaminants in MW-4 have decreased since last quarter's monitoring event. The concentrations of Benzene and MTBE found in the water samples ' collected from this site are significantly above the State Allowable Limits. Appendix A contains the laboratory analytical data and Chain of Custody report. ' The monitoring wells will be measured, purged and sampled again next quarter, and a new gradient calculated. 2