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' I M <br /> SUMMARY OF GROUNDWATER ATION AND ANALYTICAL DATA <br /> STOCKTON MAINTENANCE STATION <br /> STOCKTON,CALIFORNIA <br /> Depth To Groundwater TPH-G TPH-D Benzene Toluene Ethyl- benzene Total RITBE <br /> well 1 D Date TOC Elevation Groundwater Elevation (µg11) (µg11) (92f1) (µms) (118A) Xylenes (094) <br /> (µSA) <br /> I <br /> VW-2 02/06/1996 21 90 63 17 -4127 16 000 <50 3 000 3 100 260 2000 <50 <br /> I <br /> VW-2 04/11/1996 2190 6163 -3973 --- — -- --- — -'- <br /> VW 2 04/23/1996 2190 6137 1947 54 000 <50 8 100 5 600 290 6 500 60 <br /> VW-2 07/02/1996 2190 6019 -38 29 20 000 1 400 3 000 1 700 200 1 700 53 <br /> VW-2 10/2311996 2190 6055 -3865 17000 570 4200 1300 89 430 430' <br /> VW-2 05129!1997 1 21 90 55 57 -33 67 15,000 <500 2 300 1 600 380 2200 29 <br /> V W 2 10/17/1997 2190 5719 3529 11 000 <500 1 800 580 170 870 22 <br /> VW 2 12/29/1997 21 90 5699 3509 10 000 570 1 300 1 400 230 1,200 <5 <br /> VW-2 03/16/1998 21 90 5370 -31 80 7 400 10000 1 100 860 180 ..1-1.00 <5 <br /> VW 2 06/26/1998 2190 4987 -27 97 9 000 <5000 1 400 670 330 2 100 (<5) <br /> VW-2 09/28/1998 2190 5175 2985 8 400 <5000 1 800 510 400 1900 75(37 4) <br /> VW 2 12/0211998 21 90 49 89 2799 7 800 2900 1 100 360 290 1 100 i8(54) <br /> VW 2 03/31/1999 22 18 46 51 -2433 2,100 320 1 500 460 750 050 63 <br /> VW-2 06/28/1999 22 18 46 74 -24 56 1 5,700 <100 865 57 <0 2 302 76 <br /> Notes <br /> TOC=Top of casing elevation MSL= Mean Sea Level <br /> TPH G=Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015M <br /> TPH D=Total Petroleum Hydrocarbons as Diesel by EPA Method 8015M <br /> BTEX=Benzene Toluene Ethylbenzene and Total Xylenes by EPA Method 8020 <br /> MTBE=Methyl Tertiary Butyl Ether by CPA Method 8020 <br /> NA=Not applicable <br /> <-Less than method detection limit <br /> i <br /> - =Not measured sampled tested or present <br /> All groundwater level measurements are presented in feet <br /> mgA=milligrams per bier <br /> pg/l=micrograms per liter <br /> (<5)=MTBE concentration as calculated by EPA Method 8260 <br /> I Denotes MTBE samples analyzed by FPA Method 8260B <br /> NR dutoits Not Rcprirltd <br /> NU denotes laboratory analysis data not used due to exceedence of sample holding times <br /> All data poor to 311/99 was provided by the previous consultant(PSI) <br /> A"J"after the laboratory result indicates that the compound was detected above the method detection limit,but below the laboratory reporting limit <br /> Page 9 of 9 <br />