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� .M � � � M M M Nam M M M m M m4r m Project No9475-06-24 June 24,2002 Page 1 of I TABLE 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 1 D DATE MSL (feet) MSL (µg/l) (µg/1) (µg11) (µg/l) (11911) (µg/1) WA) (µg/1) (feet) (feet) MW-1 5/10102 2206 4890 -2684 <50 <100 <0 5 <0 5 <0 5 <0 5 <5 ND MW-2 5/10102 2198 4914 -2716 <50 510 <0 5 <0 5 <0 5 <0 5 <5 TAME=9 MW-3 5110102 21 92 4878 -2686 <50 <100 91 <0 5 54 20 <5 ND MW-4 5110102 21 98 4903 -2705 <50 <100 <0 5 <0 5 <0 5 28 <5 ND MW-5 5/10/02 2203 4901 -2698 <50 <100 <05 <0 5 <0 5 <0 5 <5 ND MW-6 5/10102 2141 4936 -2695 <50 <100 <05 <0 5 <0 5 <05 <5 ND MW-7 5/10/02 21 75 4866 -2691 <50 <100 <0 5 <0 5 <0 5 <0 5 <5 ND MW-8 5110102 2196 4879 -2683 <50 <100 <0 5 <0 5 <0 5 <0 5 <5 ND MW-9 5/10/02 2080 4783 -2703 <50 <100 <05 <0 5 <0 5 <0 5 <5 ND MW-10 5/10102 21 79 4898 -2719 <50 <100 <0 5 <05 <0 5 <0 5 <5 ND MW-11 5110102 2149 4863 -2714 <50 <100 <0 5 <0 5 <0 5 <0 5 <5 ND MW-12 5110102 2282 4853 -2571 <50 <100 <0 5 <0 5 <0 5 <0 5 <5 ND VW-1 5110/02 21 98 4909 -27 11 <50 210 <0 5 <0 5 <0 5 <0 5 <5 ND VW-2 5/10102 22 18 4928 -2710 <50 2,200 200 <0 5 64 90 120 TAME=60 Notes TOC=Tap 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 tert-butyl ether(ETBE),di-isopropyl ether(DIPS)and tert-butanol(TBA)fallowing EPA Test Method 8260 µg/1=Micrograms per liter ND=Not detected above the laboratory test method detection limit <=Less than laboratory method detection limit