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i • TABLE I GROUNDWATER MONITORING DATA Qutk Stop No 039 2285 Fremont Street,Stockton,California ethyl- total Depth to TOC GW Well TPI-Im TPHg benzene toluene benzene xylene MTBE DIPE ETBE TAME TBA methanol ethanol DCA DBA GW Elevation Elevation Numbe Date (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ugIL) (ug/L (ug/L) (ug/L) (ug/L) (ug1L) (ug/L) (ug/L)(ug/L (feet) (feet msi) (feet msl) Comments MW-1 12/15/99 4100 <50 <0 50 <0 50 27 <0 50 <5 0 no no no no no no no no 4453 2071 -2382 screened05/19/00 <100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no na no no no 4119 -2048 no comment interval 08/31/00 <100 60 <0 50 <0 50 <0 50 <0 50 <5 0 na na no na no no na no 44 35 -2364 no comment 40.60 11/02100 200 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 16 <0 50 4639 2191 -2448 no odorino sheen 03126101 no <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 no no na no 4443 -2252 no odortno sheen 06/21/01 no <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 no no 4569 -2378 no odortr sheen 09117/01 no <50 <0 50 1 7 <0 50 <0 50 <5 0 no no no no no na no na 4914 -2723 no odorino sheen MW-2 12/15/99 na 610 <0 50 <0 50 <0 50 050 <50 no no no no no no 4541 2176 2365 screened 05!19100 no 300 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no no no no 4213 2037 no Comment interval 08131/00 no 180 <0 50 <0 50 <D 50 <0 50 <5 0 no no no no no no no no 4579 -2403 no comment 40-60 11/02100 na 280 <0 5o <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <50 160 <0 50 4622 2176 2446 no odor/no sheen 03/26/01 no 280 <0 50 20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 11 no no na no 4435 -2259 no odorino sheen 06/21/01 no 150 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 no no 4559 -2383 no odor/no sheen 09117/01 no 230 <0 50 084 <0 50 <0 50 <50 no no no no no no na na 4890 27 14 no odortno sheen MW-3 12115!99 no 360 <0 50 <0 50 <0 50 <0 50 <50 no na no no no na 4408 2038 -2370 screened 05119!00 na 710 <0 50 <0 50 <0 50 40 50 <5 0 no no no no no na na no 4073 -2035 no comment interval 08/31/00 no 480 <0 50 <0 50 <0 50 <0 50 <5 0 na no na no no no no no 4438 -2400 no comment 40-60' 11102!00 na 310 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 26 <50 <5 0 160 <0 50 44 83 2040 -2443 no odorino sheen 03126/01 no 270 <0 50 2 1 <0 50 54 <0 50 <0 50 <0 50 <0 50 23 no no no no 4294 -2254 no odor/no sheen 06/21/01 no 310 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 26 <50 <5 0 na na 4424 -23 84 no odortno sheen 09/17/01 no 210 <0 50 1 5 <0 50 <0 50 <5 0 <5 0 no no no no no no no 4749 -2709 no odorino shee Notes TPHmo=total petroleum hydrocarbons as motor oil DCA=1 2-dlchloroethane <=less than indicated reporting limit TPHg=total petroleum hydrocarbons as gasoline DBA= 1 2-dibromoethane ns=not sampled MTBE=methyl tert-butyl ether GW=groundwater nm=not measured DIPE=dusopropyl ether TOC=top of casing ETBE=ethyl tart-butyl ether msl=mean sea level TAME=tert-amyl methyl ether TBA=tart-butanol 039gmr0D As 703942 Page 1 of 1 HORIZON ENVIRONKMTAL INC