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Table 1 GROUNDWATER ELEVATIONS AND SAMPLE ANALYTICAL RESULTS Boettcher WesteEn 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 12/21/94 759 2701 -1942 ND<0 5 ND<0 5 ND<0 5 ND<0 5 -- ND<50 -- -- cont'd 3/13/95 759 2446 -1687 ND<0 5 ND<0 5 ND<0 5 ND<1 0 -- 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 -- -- 12/17/96 759 2108 -1349 ND<0 5 ND<0 5 ND<0 5 ND<2 0 ND<5 0 130 -- -- -- 3/6/97 759 1688 -929 ND<0 5 ND<0 5 ND<O 5 ND<2 0 ND<5 0 90 -- -- 6/1/97 759 18 06 -1047 ND<05 ND<0 5 ND<0 5 ND<2 0 ND<5 0 ND<50 -- -- -- Samples collected through 12/3/93 by McE wren/Hai t Samples collected since 12/21/94 by Clearwater Gioup Inc TOC Top of casing elevation in feet referenced to mean sea level ppb Parts per billion(ug/1) DTW Depth to groundwater ND Not detected at or above indicated method reporting limit GWE: Gioundwater elevation in feet(TOC-DTW) -- Not analyzed BTEX Bencene,toluene,ethylbenzene and total xylenes by EPA Method 8020(modified) (1) Groundwater elevation data obtained 11/12/92 TPI Ig Total petroleum hydrocarbons as gasoline by EPA Method 8015(modified) (2) Groundwater elevation data obtained 9/3/93 TPI Id I otal petroleum hydrocarbons as diesel by EPA Method 8015(modified) 11,111110 Total petroleum hydrocarbons as motor oil by EPA Method 80I5(modified) Page 4 of 4