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M i = = = = is = = = = M <br /> Project No 00-06-62 <br /> August 22, 1996 <br /> Page 3 of 3 <br /> TABLE I <br /> CUMULATIVE SUMMARY OF GROUNDWATER MONITORING DATA AND ANALYTICAL RESULTS <br /> CALTRANS STOCKTON YARD MAINTENANCE FACILITY <br /> STOCKTON,CALIFORNIA <br /> WELL ID DATE DEPTH TO TOC GROUNDWATER TPHg TPHd B T E X MTBE SAMPLED <br /> GROUNDWATER ELEVATION ELEVATION (ugA) (ug") (ug/1) (ug/1) (ugll) (ug/1) (ug/1) BY <br /> (mg/1) (mg/1) <br /> I <br /> VW-2 4/11196 6163 2190 -3973 --- -- --- --- --- --- --- Geocon <br /> VW-2 4/23196 6137 2190 -3947 54,000 <50 8,100 5,600 290 6 500 60 Gcocon <br /> VW-2 7/2/96 6019 2190 -3829 20000 1400 3,000 1,700 200 1,700 53 Geocon <br /> VW-2dup 712/96 6019 2190 -3829 20,000 1 400 3 500 2000 200 1 900 58 Geocon <br /> MW-9 2/5/96 61 15 2043 -4072 <50 <50 <0 3 <0 3 <03 <0 3 <0 5 Geocon <br /> MW-9 4/11/96 6025 2043 -3982 --- --- --- --- --- --- --- Geocon <br /> MW-9 4/22196 5999 2043 -3956 <50 <50 <0 5 <0 5 <0 5 <0 5 <0 5 Geocon <br /> MW-9dup 4/22196 5999 2043 -3956 <50 --- <0 5 <0 5 <0 5 <0 5 <0 5 Geocon <br /> MW-9 7/1196 5881 2043 -3838 <50 <50 <0 5 <0 5 <0 5 <0 5 <0 5 Geocon <br /> MW-10 2/5/96 6250 2144 -41 06 <50 <50 <0 3 <0 3 <0 3 <0 3 <0 5 Geocon <br /> MW-10 4/11/96 61 10 2144 -3966 --- --- --- --- -- --- --- Geocon <br /> MW-10 4/22/96 NM 2144 NM --- - --- --- --- --- --- Geocon <br /> MW-10 711/96 NM 2144 NM --- --- --- --- --- --- --- Geocon <br /> MW-11 2/5/96 6235 21 I3 -4122 500 <50 3 5 23 <0 3 <0 3 170 Geocon <br /> MW-11 4/11/96 6096 2113 -3983 --- --- --- --- --- Geocon <br /> MW-11 4/22196 6071 2113 -3958 <50 <50 07 <0 5 <0 5 <0 5 10 Geocon <br /> MW-11 7/1/96 5958 21 13 -3845 600 120 5 1 42 <0 5 1 0 14 Geocon <br /> MW-12 2/5/96 63 50 22 19 -4131 <50 <50 <0 3 <0 3 <0 3 <0 3 <0 5 Geocon <br /> MW-12 4111/96 6189 2219 -3970 --- --- --- --- -- --- --- Geocon <br /> MW-12 4/22/96 6162 2219 -3943 <50 100 <0 5 <0 5 <0 5 <0 5 <0 5 Geocon <br /> MW-12 7/1/96 6051 22 19 -38 32 <50 140 <0 5 <0 5 <0 5 <0 5 <0 5 Geocon <br /> Notes ugll=Micrograms per Mer AG=Alton Geosciences <br /> TOC—Top of casing elevation surveyed v<ith respect to Mean Sea Level(MSL) EA=Environmental Assessors,Inc <br /> TPHg=Total petroleum hydrocarbon as gasoline N&M=Nmyo&Moore <br /> TPHd=Total petroleum hydrocarbon as diesel *=Laboratory report notation"the above samples do not appear to contain diesel" <br /> BTEX=Benzene,toluene ethylbenzene and total xylenes ---=Not tested <br /> MTBE=Methyl-tent-butyl-ether <br /> Depth to groundwater measured in feet from top of well casing <br /> Groundwater elevations for 04/06/92 were recalculated using the Caltrans survey performed on 10/27/93 <br />