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r Table 1 GROUNDWATER ELEVATIONS AND 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-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 -- 12/21/94 759 2701 -1942 ND<0 5 ND<0 5 ND<0 5 ND<0 5 -- ND<50 — -- 3/13/95 759 2446 -1687 ND<0 5 ND<0 5 ND<0 5 ND<10 -- ND<50 -- — -- 6/8/95 759 2325 -1566 ND<0 5 ND<0 5 ND<0 5 ND<10 -- ND<50 — -- 8/30/95 759 2462 -1703 ND<0 5 ND<0 5 ND<0 5 ND<2 0 -- 100 -- -- — 12/11/95 759 2453 -1694 ND<0 5 ND<0 5 ND<0 5 ND<2 0 — 100 -- -- -- 3/14/96 759 2094 -1335 ND<0 5 ND<0 5 ND<0 5 ND<2 0 ND<50 100 -- -- 6/19/96 759 2100 -1341 ND<0 5 ND<0 5 ND<0 5 ND<2 0 ND<50 70 -- — -- 9/25/96 759 2235 -1476 ND<0 5 ND<0 5 ND<0 5 ND<2 0 ND<5 0 ND<50 -- -- -- Notes TOC Top of casing elevation in feet referenced to mean sea level Samples collected through 12/3/93 by McLaren/Hart DTW Depth to groundwater Samples collected since 12/21/94 by Clearwater Group Inc GWE Groundwater elevation in feet(TOC-DTW) BTEX Benzene,toluene,ethylbenzene and total xylenes by EPA Method 8020(modified) TPHg Total petroleum hydrocarbons as gasoline by EPA Method 8015 (modified) TPHd Total petroleum hydrocarbons as diesel by EPA Method 8015(modified) TPHzmo Total petroleum hydrocarbons as motor oil by EPA Method 8015(modified) ppb Parts per billion(ug/1) ND Not detected at or above indicated method reporting limit Not analyzed (1) Groundwater elevation data obtained 11/12/92 (2) Groundwater elevation data obtained 9/3/93 Page 3 of 3