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TablbT Pa g of 30 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Holt Dr,Stockton,California Well Depth Product Groundwater Groundwater Total Date Elevation to Water thickness, Elevation Elevation change TPH-G Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mg/l MW 5 3/8/1995 104 1291 - -11 87 1187 1,800 43 4 7 3 3 60 6/2/1995 11 40 -1036 1 51 1,300 55 27 2 3 75 9/11/1995 1365 - -1261 -225 1,500 87 3 91 29 12/5/1995 1403 - -1299 -038 2,200 120 <10(e) 16 11 3/18/1996 1082 -978 3 21 6,200 190 19 24 800 6/18/1996 950 -- -846 1 32 15,000 170 <25 <25 2,500 <250 9/25/1996 1230 -1126 -280 3,800 130 <5 8 4 71 <50 12/4/1996 1163 -- -1059 0 67 4,200 88 <2 15 44 <20 - 3/19/1997 P 718 -- -614 4 45 1,400 26 5 6 4 6 9 8 01 6/5/1997 P 884 -- -7 80 -166 1,900 22 5 1 4 14 <10 0 2 8/19/1997 NP 1025 -921 1 41 <50 <0 5 <0 5 <0 5 <0 5 <5 0 2 11/25/1997 NP 1048 -- -944 -023 210 <0 5 <0 5 <0 5 <0 5 <5 3/20/1998 P 427 -323 6 21 <50 <0 5 <0 5 <0 5 <0 5 <5 2 2 6/24/1998 Well Box Inaccessable - - 9/10/1998 P 779 -675 - <50 <0 5 <0 5 <0 5 <0 5 <5 12/17/1998 P 806 -702 027 995 <0 5 <0 5 <0 5 <0 5 <5 3/10/1999 P 586 -- -482 220 80 6 <0 5 <0 5 <0 5 <0 5 <5 2 8 6/22/1999 Well Box Inaccessable - - 9/13/1999 Well Box Inaccessable — -- — _ -- 12/16/1999 P 925 .. 821 186 096 <0 5 <0 5 1 03 <2 5 3 3 3/23/2000 P 461 -357 464 355 0 620 <0 5 <0 5 1 28 <25 2 0 6/21/2000 P 696 — -592 -235 <50 <0 5 <0 5 <0 5 <0 5 <2 5 0 2 9/13/2000 P 868 -- -764 172 <50 <0 5 <0 5 <0 5 <0 5 <2 5 241 12/15/2000 P 816 — -712 052 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 0 83 a =Corrected water level elevation value where free product is present(Wlc=WIm+(b)(p)),where Wlc=water level elevation corrected,Wlm=water level elevation measured b=hydrocarbon thickness(in feet),p=specific gravity(0 7)of hydrocarbon =Indicates not measured,not calculated,or not analyzed For separate phase hydrocarbons(SPH), indicates no SPH detected TPH G =Total Petroleum Hydrocarbons as Gasoline by USEPA Method 8015,Modified MTBE =Methyl Tert-Butyl Ether by USEPA Method 8020 DO =Dissolved Oxygen ppb=parts per billion P =Well purged prior to sample collection mg/l=milligrams per liter NP =Well not purged prior to sample collection TOG =Top of Casing MSL =Mean Sea Level BTEX Distinction by USEPA Method 8020 1 Wells E-3,E 4, E-5,E-6,E-7,PR 2,BHD 2 MW-1,MW-2,and MW-3 are on a semi-annual sampling schedule