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Project No S8100-06-11 March 29, 1995 TABLE I CUMULATIVE SUMMARY OF GROUNDWATER MONITORING DATA AND ANALYTICAL RESULTS CALTRANS STOCKTON YARD MAINTENANCE FACILITY STOCKTON, CALIFORNIA WELL ID DATE DEPTH TO TOC GROUNDWATER TPHg TPHd B T E x SAMPLED GROUNDWATER ELEVATION (ug/l) (ug/L) (ug/l) (ug/L) (ug/l) (ug/l) BY Mw-1 04/06/92 65 96 21 49 -44 47 4,900 180* 1,100 360 <3 400 AG MW-1 10/22/93 67 92 21 49 -46 43 27,000 --- 11,000 1,500 <0 5 1,400 EA MW-1 06/01/94 65 68 21 49 -44 19 1,500 <50 13,700 418 14 5 206 N&M MW-1 03/06/95 65 01 21 49 -43 52 2,200 280 150 75 13 71 Geocon MW-1 dup 03/06/95 65 01 21 49 -43 52 2,300 --- 150 80 13 71 Geocon MW-1 03/08/95 65 03 21 49 -43 54 --- --- --- --- --- --- Geocon MW-2 04/06/92 66 17 21 71 -44 46 3,200 73* 450 12 <3 49 AG MW-2 10/22/93 68 12 21 71 -46 41 4,500 --- 1,000 93 25 170 EA MW-2 06/01/94 65 85 21 71 -44 14 588 <50 337 151 <2 5 45 7 N&M MW-2 03/06/95 65 28 21 71 -43 57 1,400 100 150 10 5 3 15 Geocon MW-2 03/08/95 65 21 21 71 -43 50 --- --- --- --- --- --- Geocon i MW-3 04/06/92 65 98 21 41 -44 57 2,400 84* 260 9 8 <3 22 AG MW-3 10/22/93 67 80 21 41 -46 39 4,700 --- 520 100 9 0 110 EA MW-3 06/01/94 65 48 21 41 -44 07 1,200 <50 238 411 <5 0 295 N&M MW-3 03/06/95 65 01 21 41 -43 60 1,700 110 150 38 4 1 38 Geocon MW-3 dup 03/06/95 65 01 21 41 -43 60 1,900 --- 140 37 4 0 37 Geocon MW-3 03/08/95 64 91 21 41 -43 50 --- --- --- --- --- --- Geocon notes ug/l = micrograms per Liter TOC = top of casing TPHg = total petroleum hydrocarbon as gasoline j TPHd = total petroleum hydrocarbon as diesel BTEX = benzene, toluene, ethyLbenzene and total xylenes -- = not tested depth to groundwater measured to feet from top of well casing historical groundwater elevations have been recalculated using the Caltrans wet( survey performed on 10/27/93 * = laboratory report natation "the above samples do not appear to contain diesel,, AG = Alton Geosciences f EA = Environmental Assessors, Inc N&M = Ninyo & Moore A �I