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Table 1 GROUNDWATER ELEVATIONS AND SAMPLE ANALYTICAL RESULTS Boettcher Western Properties 4555 North Pershing Avenue Stockton, California Total Well Sampling TOC DTW GWE B T E X MTBE TPHg TPHd TPHmo Lead Number Date (feet) (feet) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-3 6/4/97 729 1756 -1027 35 ND<0 5 06 ND<2 0 ND<5 0 ND<50 -- -- -- cont'd MW-4 11/19/92 (1) 722 3018 -2296 18 12 12 135 -- ND<500 ND<500 ND<500 42 6/4/93 722 2614 -1892 430 ND<5 0 20 91 -- 840 ND<500 ND<500 ND<3 0 9/4/93(2) 722 2665 -1943 120 ND<0 5 23 100 -- 1,100 ND<500 ND<500 — 12/3/93 722 2629 -1907 380 ND<0 5 26 80 -- ND<500 ND<500 ND<500 12/21/94 722 2641 -1919 400 45 89 140 -- 2,700 -- -- -- 3/13/95 722 2383 -1661 25 ND<0 5 31 71 450 -- -- -- 6/8/95 722 2266 -1544 16 ND<0 5 36 14 -- 100 -- -- 8/30/95 722 2402 -1680 23 ND<0 5 40 ND<2 0 100 -- --12/11/95 722 2396 -1674 83 ND<0 5 30 ND<2 0 -- 100 -- -- -- 3/14/96 722 2032 -1310 11 ND<0 5 18 41 ND<50 100 -- -- -- 6/19/96 722 2042 -1320 19 ND<0 5 ND<0 5 ND<2 0 ND<50 ND<50 -- -- -- 9/25/96 722 2179 -1457 ND<0 5 ND<0 5 ND<0 5 ND<2 0 ND<5 0 ND<50 -- — -- 12/17/96 722 2051 -1329 ND<0 5 ND<0 5 ND<0 5 ND<2 0 ND<5 0 ND<50 -- -- 3/6/97 722 1631 -909 ND<0 5 ND<0 5 ND<0 5 ND<2 0 ND<5 0 ND<50 -- -- -- 6/4/97 722 1753 -1031 13 ND<0 5 ND<0 5 ND<2 0 ND<5 0 ND<50 — -- MW-5 11/19/92(1) 759 3080 -2321 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<500 ND<500 ND<500 76 6/4/93 759 2676 -1917 ND<0 5 ND<0 5 ND<0 5 ND<0 5 -- ND<500 ND<500 ND<500 ND<3 0 9/3/93 759 2728 -1969 ND<0 5 ND<0 5 ND<0 5 ND<0 5 -- ND<500 ND<500 ND<500 -- 12/3/93 759 2687 -1928 ND<0 5 ND<0 5 ND<0 5 ND<0 5 -- ND<500 ND<500 ND<500 -- Page 3of4