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Project Ao9475-06-24C January 23,2002 Page 2 of 2 TABLE l SUMMARY OF GROUNDWATER ELEVATION AND ANALYTICAL DATA SHOP 10 MAINTENANCE STATION SAN JOAQUIN COUNTY,CALIFORNIA TOC DEPTH TO GROUND WATER SAMPLE SAMPLE ELEVATION ELEVATION TPHg TPHd B T E X MTBE FOCs 1 D DATE MSL GROUNDWATER MSL (µgll) (µg/1) (110) (99/1) (µg11) (µF,11) (W) (11€11) (feet) (feet) (feet) MW-24 5/9102 2150 4938 -2688 <50 <100 21 12 36 93 <5 ND MW-24 719102 21 50 5002 -2852 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-24 1012102 21 50 51 90 -3040 <50 230 <0 5 <05 <0 5 <0 5 <5 ND MW-24 12/10/02 21 50 5188 -3038 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-25 519/02 21 95 4858 -2663 <50 <100 <0 5 <0 5 <0 5 <0 5 <5 ND /MW-25 7/8102 21 95 5018 -2923 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-25 10/l/02 2195 5208 -3013 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND MW-25 12/10/02 21 95 5205 -3010 <50 <50 <0 5 <0 5 <0 5 <0 5 <5 ND VM-1 5/9102 --- 4893 --- <50 520 130 39 86 19 <5 ND VM-1 7/9102 - 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 12111/02 --- 5243 280 270 31 <0 5 10 52 <5 ND VM-2 5/9102 - 4850 --- <50 5,300 6,800 390 740 930 <20 TAME=230 VM-2 7/9102 --- 5008 — 25,000 3,800' 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 i 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),dr-isopropyl ether(DIPE)and tert-butanol(TBA)following EPA Test Method 8260 µg11=Micrograms per titer <=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"