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M aM = = M M M mom M MM M M MW M Project No S -06-llb April 19,1996 PAGE 2 OF 2 TABLE III 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 MTBE SAMPLED GROUNDWATER ELEVATION (uglL) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) BY MW-6 512/95 63 61 2092 4269 — -- --- --- — --- --- Geocon MW-6 515/95 --- 2092 -- 1,800 <50 250 17 55 13 --- Geocon MW-6 2/6196** 62 10 2092 4118 900 <50 380 39 25 19 <0 5 Geocon MW-6 4/11/96 6068 2092 -3976 --- --- --- --- --- --- --- Geocon MW-7 512195 6396 2127 -4269 --- --- --- -- --- --- --- Geocon MW-7 515195 --- 2127 -- 1,700 <50 13 43 07 44 --- Geocon MW-7 2/6/96** 6255 2127 -4128 340 <50 59 52 <03 28 52 Geocon MW-7 4/11196 6104 2127 -3977 --- --- --- --- --- --- -- Geocon MW-8 512/95 6411 2148 4263 550 <50 3 1 18 06 40 -- Geocon MW-8 2/5196 6268 2148 4120 360 <50 55 <0 3 <0 3 <0 3 100 Geocon MW-8dup 2/5196 6268 2148 4120 290 <50 44 <0 3 <0 3 <03 81 Geocon MW-8 4111196 61 17 2148 -3969 -- --- --- --- -- -- — Geocon VW-1 5/2/95 6440 21 73 -4267 -- --- --- --- -- — Geocon VW-1 6/6/95 6383 2173 -4210 28,000 600 5,300 2,500 300 2,000 -- Geocon VW-1 2/6196** 6296 21 73 4123 10,000 <50 1,700 1,300 860 960 <50 Geocon VW-1 4111/96 6142 2173 -3969 --- --- -- --- --- --- --- Geocon VW-2 2/6/96** 6317 2190 4127 16,000 <50 3,000 3,100 260 2,000 <50 Geocon VW-2dup 216196 6317 2190 4127 24,000 <50 4,700 4,700 2,500 2,800 <100 Geocon VW-2 4/11196 6163 2190 -3973 --- --- -- -- --- --- --- Geocon MW-9 2/5196 61 15 2043 -4072 <50 <50 <0 3 <0 3 <0 3 <0 3 <0 5 Geocon MW-9 4/11196 6025 2043 -3982 -- --- --- -- --- --- --- Geocon MW-10 215196 6250 2144 -4I 06 <50 <50 <0 3 <0 3 <0 3 <0 3 <0 5 Geocon MW-10 4111196 61 10 2144 -3966 -- --- --- --- --- --- --- Geocon MW-11 215/96 6235 21 13 -4122 500 <50 35 23 <0 3 <03 170 Geocon MW-11 4111/96 6096 21 13 -3983 --- --- --- --- --- --- --- Geocon MW-12 2/5196 6350 22 19 -4131 <50 <50 <0 3 <0 3 <0 3 <0 3 <0 5 Geocon MW-12 4111/96 6189 2219 -3970 --- --- --- --- -- -- --- Geocon Notes ug1=micrograms per liter AG=Alton Geosciences TOC=top of casing EA=Envimrimental Assessors,Inc TPHg=total petroleum hydrocarbon as gasoline N&M=Nmyo&Moore TPHd=total petroleum hydrocarbon as diesel *=laboratory report notation"the above samples do not appear to contain diesel' BTEX=benzene,toluene,ethylbenzene and total xylenes **=depth to water measured on 2/5196 MTBE=Methyl-tert-butyl-ether —=not tested depth to groundwater measured in feet from top of well casing groundwater elevations for 04/06/92 were recalculated using the Caltrans survey performed on 10/27/93