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UNISM M M = M M = W Project No S8475-06-24K June 22,2004 Page 4 of 4 TABLE 1 - SUMMARY OF GROUNDWATER ELEVATION AND ANALYTICAL DATA STOCKTON MAINTENANCE STATION SAN JOAQUIN COUNTY,CALIFORNIA TOC DEPTH TO GROUND WATER SAMPLE SAMPLE ELEVATION GROUNDWATER ELEVATION TPHg TPHd B T E X MTBE FOCs I D DATE MSL, (fes) MSL 41g/1) (µg/1) (9911) (gel) (9911) (µg11) (µg11) (µg11) (feet) (feet) MW-12 10/2102 2282 53 13 -3031 <50 110 59 26 07 20 <5 ND MW-12 12/11/02 2282 5305 -3023 <50 <50 28 2 1 07 18 <5 ND MW-12 3118103 2282 5202 -2920 <50 <50 <0 5 <0 5 <0 5 <05 <5 ND MW-12 6117/03 2282 52 13 -2931 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-12 913103 2282 5349 -3067 <50 60 <0 5 <0 5 <0 5 <0 5 <5 ND MW-12 11/19/03 2282 5428 -31 46 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-12 3124104 2282 5212 -2930 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-12 5/27/04 2282 5286 -3004 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND VW-1 5110102 2198 4909 -27 11 <50 210 <05 <0 5 <0 5 <0 5 <5 ND VW-1 7/10/02 21 98 5076 -2878 190 641 056 <0 5 072 175 <5 ND VW-1 1013/02 21 98 5271 -3073 120 180 <0 5 <0 5 <0 5 <0 5 <5 ND VW-1 12/12/02 2198 5260 -3062 170 <50 <0 5 <0 5 <0 5 <0 5 <5 ND VW-1 3118103 2198 51 57 -2959 110 <50 <0 5 <0 5 <0 5 <0 5 <5 ND VW-1 6117103 21 98 5173 -2975 130 <50 <0 5 <0 5 <0 5 <0 5 <5 ND VW-1 913103 21 98 5305 -3107 75 <50 <0 5 <0 5 <0 5 <0 5 <5 ND VW-1 11/19/03 21 98 5384 -3186 60 <50 <0 5 <0 5 <0 5 <0 5 <5 ND VW-1 3124104 2198 5184 -2986 91 <50 <0 5 <0 5 <0 5 <0 5 <5 ND VW-1 5/27104 21 98 5248 -3050 647 <50 <0 5 <0 5 <0 5 <0 5 <5 ND VW-2 5110102 22 18 4928 -2710 <50 2,200 200 <0 5 64 90 120 TAME=60 VW-2 7/10/02 22 18 5098 -2880 5,700 8101 1,600 13 560 568 89 ND VW-2 1013/02 22 18 5292 -3074 4,800 2,100 1,500 15 460 490 44 ND VW-2 12/12/02 22 18 5281 -3063 5,700 2,400 11800 23 520 610 30 ND VW-2 3118103 22 18 5178 -2960 8,900 3,900 2,400 18 710 880 47 ND VW-2 6117103 22 18 51 94 -2976 9,900 2,100 2,800 20 910 660 74 ND VW-2 913/03 22 18 5326 -3108 4,700 1,400 1,300 17 500 230 38 ND VW-2 11/19/03 2218 5405 -3187 5,200 1,700 1,500 79 540 240 34 ND VW-2 3124104 22 18 5198 -2980 9,800 2,800 2,300 86 750 480 96 ND VW-2 5127104 22 18 5266 -3048 5,680 1,100 1,900 189 608 342 590 ND Notes TOC=Top of Casing µg/I=Micrograms per liter MSL=Mean Sea Level ND=Not detected above the laboratory test method detection limit TPHg=Total petroleum hydrocarbons as gasoline <=Less than laboratory method detection limit TPHd=Total petroleum hydrocarbons as diesel BTEX=Benzene,toluene,ethylbenzene and total xylenes MTBE=Metbyl tert-butyl ether by EPA Test Method 8260 FOCs=Tert-amyl methyl ether(TAME),ethyl tent-butyl ether(ETBE),di-isopropyl ether(DIPE)and Cert-butanol(TBA)following EPA Test Method 8260 _"Samplc contains hydrocarbons that do not match the diesel pattern However,quantification is based on a diesel standard"