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TABLE 4 EPA 8260m ANALYTICAL RESULTS OF GROUND WATER SAMPLES Pacific Mini-Mart- 4511 Pacific Avenue, Stockton, California {µdl) Di- Ethyl Methyl- tertiary- isopropyl tertiary- tertiary Amyl tertiary- Sample ID Date Ether Butyl Ether Butyl Ether Methyl Butanol Methanol Ethanol EDB 1,2-DCA (DIPS) (ETBE) (MTBE) Ether TAME MW4 07/23/97 <100 <100 210 <100 <500 -- -- -- -_ 10/30/97 <40 <40 380 <40 <200 02/24/98 <10 <10 89 <10 89 -- -- -- -- 06/15/98 <5 0 <5 0 73 <5 0 <50 12/31/98 <7 0 <7 0 110 <7 0 <35 -- -- -- -- 03/22/99 <10 <10 44 <10 25 -- -- __ 07/08/99 <10 <10 59 <10 15 -- -- -- __ 10/27/99 <5 <5 68 <5 39 -- -- -- __ 01/31/00 <1 0 <l 0 53 <1 0 <5 0 04/26/00 <2 5 <2 5 79 <2 5 <12 5 -- -- -- 08/18/00 <2 5 <2 5 63 <2 5 <12 5 -- -- -- -_ 10/24/00 <5 0 <5 0 48 <5 0 <25 <1,000 <250 <1 0 <1 0 01/26/01 <10 <10 21 <10 <50 <2,000 <500 <10 <10 04/24/01 <5 0 <5 0 14 <5 0 <25 <2,500 <250 <5 0 <5 0 07/03/01 <2 5 <2 5 15 <2 5 <13 <1,300 <130 <2 5 <2 5 10/22/01 <1 0 <1 0 38 <1 0 <5 0 <500 <50 <1 0 <1 0 02/14/02 <l 0 <1 0 23 <1 0 <5 0 <500 <50 <1 0 <1 0 05/15/02 <1 0 <1 0 7.7 <1 0 <5 0 <500 <50 <1 0 <1 0 08/15/02 <1 0 <1 0 58 <1 0 <5 0 <1,000 <500 <1 0 <1 0 11/25/02 <5 0 <5 0 130 <5 0 <5 0 <5,000 <500 <5 0 <5 0 02/25/03 <10 <10 400 <10 <100 — — <10 <10 10/02/03 <1 0 <1 0 27 <1 0 <10 -- -- <0 5 1 <0 5 Notes µg/1 micrograms per liter EDB ethylene 1,1romide 1,2-DCA 1,2-dichloroethane Advanced GeoEnvironmental,Inc.