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K L E I N F E L D E R • Table l Summary of Groundwater Analytical Results August 1998 through July 2002 Former Underground Storage Tank Site 212 Industnal Drive Stockton CA,95206 Sample Sample Sample Sample TPH-G Benzene Toluene Ethyl Total MTBE Ethanol/ VOCs Oxygenates Location ID Number Depth Date Benzene Xylenes Methanol EPA 8260 (Feet) (119/1) (µg/1) (µg/1) (µ8l1) (µg/1) (µ8/1) (µ8d) fµ8/1) (µ8A) P5-W P5 W NA 03/06/98 I1,000 610 250 48 68 ND ND ND B-2 234W 34* 08/11/98 4,700 10,000 <25 25 970 <5 0 B-3 333W 33* 08/12/98 3,100 2,200 86 290 260 -- B-4 434W 34* 08/13/98 ND ND ND ND ND - B-5 534W 34" 08/13/98 ND ND ND ND ND -- B-6 634W 34* 08/13/98 ND ND ND ND ND B-7 734W 34* 08/13/98 ND ND ND ND ND - MW-1 MW-1 NA 10/02/98 1,100 4,500 ND ND ND ND ND MW-2 MW-2 NA 10/02/98 ND 10 ND ND 38 ND - ND MW-3 MW-3 NA 10/02/98 45 200 ND ND 64 ND ND MW l MW-1 NA 01/28/99 28,000 9,300 67 460 880 ND -- MW 2 MW 2 NA 01/28/99 280 ND ND ND ND ND - MW-3 MW-3 NA 01/28/99 100 ND ND ND 26 ND MW-1 MW-1 NA 05/14/99 10,000 4,600 ND ND 190 ND -- - MW-2 MW-2 NA 05/14/99 170 18 ND ND ND ND - MW-3 MW-3 NA 05/14/99 57 12 ND ND ND ND MW-1 MW-1 NA 09/02/99 11,000 4,300 ND ND ND ND MW-2 MW-2 NA 09/02/99 210 35 ND ND ND ND MW-3 MW 3 NA 1 09/02/99 48 28 ND ND ND ND -- MW-1 MW I NA 12/21/99 24,000 7,800 ND 440 ND ND ND ND MW-2 MW-2 NA 12/21/99 150 58 ND ND ND ND ND -- ND MW-3 MW-3 NA 12/21/99 40 11 ND ND ND ND ND ND CP-2 19112 NA 06/01/00 ND ND ND ND ND ND ND - ND GP-3 19111 NA 06/01/00 22 ND ND ND ND ND ND ND GP-4 19094 NA 06/01/00 62 11 ND ND ND ND ND ND GP-5 19093 NA 06/01/00 86 ND ND ND ND ND ND ND MW 1 19022 NA 07/07/00 2000+ 1,100 ND ND ND -- MW-2 19024 NA 07/07/00 110+ 10 ND ND ND -- MW-3 19023 NA 07/07/00 47+ 19 ND ND ND MW-1 21140 NA 12/28/00 4,100 1,800 093 74 ND -- MW-2 21141 NA 12/28/00 99++ ND ND ND ND -- MW-3 21142 NA 12/28/00 320++ 130 ND ND ND - - MW 1 24218 NA 08/l6/01 2,400 1,100 ND 52 22 M W 2 24219 NA 08/16/01 93++ ND ND ND ND - - MW 3 24220 NA 08/16/01 49++ 17 ND ND ND MW-1 24463 NA 12/11/01 61.0 220 ND ND ND MW-2 24464 NA 12/11/01 36 ND ND ND ND MW-3 24465 NA 12/11/01 520 190 ND ND ND MW-1 25385 NA 07/03/02 380++ 134 ND 68 ND -- MW-2 25384 NA 07/03/02 30++ ND ND ND ND MW-3 25382 NA 07/03/02 140 70 ND ND ND - Notes µg11 —mncrognmg per hterlparts per hi Ilion) Oxygenates Nn =not detected at or above laboratory reporting IlnnLa FTSE =Ethyl Ternary Buryl Ether NA =not applicable DIPS =1)i Ean Propyl Ether — -not analyzed MTBE -Methyl T-bary Butyl Ether ' -discrete groundwater satnptc wheeled with a hydropunch TAME =Tertiary Amyl Methyl Ether + -the malysist noted that the chromatogram orth[s sampic is mainly a dominant TBA =Ternary Butyl Alcohol peak(s)which is not indicative of petroleum hydrocarbons ++ t the walysrst noted that the chromatogram or this sample includes a wide range of hydrocarbana which are not necessarily indicative of gasoline TPH 0 -total petroleum hydrocaitens as referenced to gasoline 20.4439 01 E04/ST02E020 Paye T 1 Copynbht 2002 Klemfelder Inc Autust 22 2002