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April 20, 1995 Project 113-26-04,Work Plan, Page 4 "Reported to parts per mullion Detection Lutists TPH-g, 10 mg/kg,Benzene,Toluene, Ethylbenzene and Xylenes,0 005 mg/kg ND= Not Detected The first number in the sample#refers to the borehole number,the second to the depth from which the sample was taken Table 2 Water Sample Analysis Results* Cheapen #37 15 East Grant Lane Road,Tracy, California Samples Collected February 26, 1993 Sam le # TPH-g Benzene Toluene Eth lbenzene Xylenes. BH1/W-1 ND < 50 ND <0.5 ND <0.5 ND <0.5 1.5 BH2/W-2 3100 1200 62 80 230 BH3/W-3 ND < 50 11 ND <0.5 ND <0.5 0.90 _ BH4/W-4 160,000 5900 10,000 5200 22,000 _ BH5/W-5 300,000 11,000 36,000 7400 37,000 BH6/W-6 20,000 150 490 700 2200 Concentrations are in parts per billion,orµg/L ND= Not Detected The sample # refers to the number of the borehole that supplied the sample. Subsequent groundwater monitoring was done at the site quarterly through March, . 1995. Sample results are presented in Table 3 below. - 0, Table 3 Monitoring Well Sample Results Cheaper #37 15 East Grant Line Road Tracy, California (in parts per billion) Date Well # TPH-g Benzene Toluene EthylbenzeneXylenes 22-Sep-92 MW-1 220 2 1 3 3 0 7 21 Feb-93 MW-1 170 1 9 7 2 4 1 3 2 May-93 MW-1 280 1 7 1 1 0 75 0 75 Aug-93 MW-1 240 ND<0 5 ND<O 5 ND<O 5 ND<O 5 Nov-93 MW-1 160 ND<0 5 ND<O 5 6 4 0 57 9-Sep-94 MW-1 610 0 77 ND<0 5 1 3 0.83 22-Dec-94 MW-1 140 ND<0 5 ND<0 5 ND<O 5 0.83 15-Mar-95 MW-1 88 ND<05 ND<05 ND<05 ND<O5 23-Sep-92 MW-2 n/a n/a n/a n/a n/a Feb-93 MW-2 ND<50 ND<O 5 3 9 ND<O 5 1 6 May-93 MW-2 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<O 5 Aug-93 MW-2 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<O 5 Nov-93 MW-2 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<O 5 9-Sep-94 MW-2 ND<50 0 8 ND<0 5 ND<O 5 ND<O 5 22-Dec-94 MW-2 ND<50 ND<O 5 ND<0 5 ND<0 5 ND<O 5 15-Mar-95 MW-2 ND<50 ND<05 ND<05 ND<05 ND<O5 Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 Phone (415) 439-1024 Fax (415) 439-2566