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Project No.$8100-06-11C <br /> December 17, 1996 <br /> Page 4 of 4 <br /> TABLE3 <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 TPHg TPHd B T E X MTBE SAMPLED <br /> WELL ID DATE (feet) (MSL) (MSL) WA) (t►g/l) (µg/1) (1g11) (NgA) (11g/1) W l) BY <br /> MWA 1 2/5/96 62.35 21.13 41.22 500 <50 3.5 2.3 <0.3 <0.3 170 Geocon <br /> MWA 1 4/11/96 60.96 21.13 -39.83 -- --- -- - - --- - Geocon ` <br /> MWAI 4/12196 60.71 21.13 -39.58 <50 <50 0.7 <0.5 <0.5 <0.5 1.0 Geocon <br /> MW-1 1 711196 59.58 21.13 -38.45 600 120 5.1 4.2 <0.5 Lo 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-I1 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 <03 <0.3 <03 <0.5 Geocon <br /> MW-12 4/11196 61.89 22.19 -39.70 --- -- --- --- --- _ --- Geocon <br /> MW-12 4/22196 61.62 22.19 -39.43 <50 I00 <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 1022/96 60.89 22.19 -38.70 <50 53 <0.5 <0.5 <0.5 <0.5 <0.5 Geocon <br /> Notes: µgA - 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/I 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 perfomwd on 1027/93 <br />