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Mir M M M M M M * M M M M M M M4r M Project No 58475-06-24D April 28,2003 Page 2 of 2 TABLE 1 SUMMARY OF GROUNDWATER ELEVATION AND ANALYTICAL DATA SHOP 10 MAINTENANCE STATION SAN 70AQUIN COUNTY,CALIFORNIA TOC DEPTH TO GROUND WATER SAMPLE SAMPLE ELEVATION ELEVATION TPHg TPHd B T E X MTBE FOCs I D DATE MSL GROUNDWATER MSL {1g11) (µg11) (µg11) (µg/1) (µg11) (µg11) (fig/1) (µgl!) (fed) {feet) (feet) MW-20 5/9/02 2252 4892 -2640 <50 <100 <0 5 <0 5 <0 5 <0 5 <5 ND MW-20 7/8102 2252 5068 -28 16 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-20 9130102 2252 5254 -3002 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-20 12/10/02 2252 5235 -2983 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-20 3117/03 2252 5130 -2878 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-24 519102 21 50 4111 -2611 <50 <100 21 12 36 93 <5 ND MW-24 7/9/02 2150 5002 -2852 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-24 10/2/02 21 50 5190 -3040 <50 230 <0 5 <0 5 <0 5 <0 5 <5 ND MW-24 12/10/02 21 50 5188 -3039 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-24 3117103 21 50 5078 -2929 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-25 5/9/02 21 95 4958 -2663 <50 <100 <0 5 <0 5 <0 5 <0 5 <5 ND MW-25 7/8102 21 95 50 18 -2823 <50 <50 <0 5 <0 5 <0 5 <05 <5 ND MW-25 10/1102 21 95 5208 -30 13 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-25 12/10/02 2195 5205 -3010 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-25 3/17/03 21 95 5093 -2899 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND VM-1 5/9/02 --- 4993 --- <50 520 130 39 86 19 <5 ND VM-1 7/9/02 --- 5053 4,900 670' 1,400 12 620 206 <5 ND VM-1 10/2102 --- 5247 420 260 69 23 19 10 <5 ND VM-1 12/11/02 --- 5243 280 270 31 <0 5 10 52 <5 ND VM-1 3/17103 --- 51 33 --- 310 <50 50 <0 5 13 26 <5 ND VM-2 5/9/02 --- 4850 --- <50 5,300 6,800 390 740 930 <20 TAME=230 VM-2 7/9102 5008 --- 25,000 3800' 8,000 160 1,200 829 <5 ND VM-2 10/2/02 5204 --- 12,000 4,800 5,300 17 710 160 <20 ND VM-2 12/11/02 5200 — 11,000 1,800 4,800 64 600 250 <20 ND VM-2 3/17/03 --- 5090 --- 2,300 740 840 85 120 26 <5 ND Notes TOC=Top of Casing MSL=Mean Sea Level TPHg=Total petroleum hydrocarbons as gasoline TPHd=Total petroleum hydrocarbons as diesel BTEX=Benzene toluene,ethylbenzene and total xylenes MTBE=Methyl tert-butyl ether by EPA Test Method 8260 FOCs=Tert-amyl methyl ether(TAME),ethyl tent-butyl ether(ETBE),di-isopropyl ether(DIPS)and tert butanol(TBA)following EPA Test Method 8260 µg/1=Micrograms per liter <,ND=Less than laboratory method detection limit =Not available '— Sample contains hydrocarbons that do not match the diesel pattern However quantification is based on a diesel standard"