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Project No.S8Iou-06-11C <br /> December 17,1996 <br /> Page 4 of 4 <br /> TABLE 3 <br /> CUMULATIVE SUMMARY OF GROUNDWATER MONITORING DATA AND ANALYTICAL RESULTS <br /> CALTRANS STOCKTON YARD MAINTENANCE FACILITY <br /> STOCKTON,CALIFORNIA <br /> DEPTH TO TOC GROUNDWATER <br /> GROUNDWATER ELEVATION ELEVATION TPI-Ig TPHd B T E X MTBE SAMPLED <br /> WELL ID DATE (feet) (MSL) (MSL) (µg/1) (µg/1) (µg/l) (µg/1) (µg/1) (µg/I) (µg/1) BY <br /> MW-11 2/5/96 62.35 21.13 -41.22 500 <50 3.5 2.3 <0.3 <0.3 170 Geocon <br /> MW-11 4/11/96 60.96 21.13 -39.83 --- --- --- --- --- --- Geocon <br /> MW-11 4/22/96 60.71 21.13 -39.58 <50 <50 0.7 <0.5 <0.5 <0.5 1.0 Geocon <br /> MW-11 7/1/96 59.58 21.13 -38.45 600 120 5.1 4.2 <0.5 1.0 14 Geocon <br /> MW-11 10/22/96 59.90 21.13 -38.77 800 170 4.8 3.6 <0.5 <0.5 16 Geocon <br /> MW-11 10/22/96 --- 21.13 --- 800 160 4.9 3.7 <0.5 <0.5 16 Geocon <br /> MW-12 2/5/96 63.50 22.19 -41.31 <50 <50 <0.3 <0.3 <0.3 <0.3 <0.5 Geocon <br /> MW-12 4/11/96 61.89 22.19 -39.70 --- --- --- --- --- --- --- Geocon <br /> MW-12 4/22/96 61.62 22.19 -39.43 <50 100 <0.5 <0.5 <0.5 <0.5 <0.5 Geocon <br /> MW-12 7/1/96 60.51 22.19 -38.32 <50 140 <0.5 <0.5 <0.5 <0.5 <0.5 Geocon <br /> MW-12 10/22/96 60.89 22.19 -38.70 <50 53 <0.5 <0.5 <0.5 <0.5 <0.5 Geocon <br /> Notes: µg/1 = Micrograms per liter AG ,= Alton Geosciences <br /> TOC = Top of casing elevation surveyed with respect to Mean Sea Level(MSL) EA = Environmental Assessors,Inc. <br /> TPHg = Total petroleum hydrocarbon as gasoline N&M = Ninyo&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 ** = MTBE=14µg/1 when analyzed by EPA Test Method 8260 <br /> MTBE = Methyl tert-butyl ether --- = Not tested <br /> MSL = Mean Sea Level <br /> Groundwater elevations for 04/06/92 were recalculated using the Caltrans survey performed on 10/27/93 <br />