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Summary of Groundwater Monitoring Results (1991-1995) <br /> for the Del Monte/Santa Fe Railway Site Located in Stockton, California <br /> Monitoring Well Number <br /> Groundwater Analyte MW-1 MW-2 MUU-3 EPA Method <br /> JANUARY 1991 <br /> TPH-d (u /L) 640 130' 1100 8015 modified <br /> BTEX (u IL) <03 <03 <03 602 <br /> Groundwater Elevation (feet)/Flow Direction -3714 -3765 -3751 North <br /> MAY 1991 <br /> TPH-d (mg/L) < 1 < 1 < 1 3550-8015m <br /> BTEX (u /L) < 1 < 1 _< 1 5030-602 <br /> Groundwater Elevation Ifeet)/Flow Direction .3501 -35 53 -35 57 North <br /> AUGUST 1991 <br /> TPH-d (p IL) < 50 < 50 < 50 3550-8015m <br /> STEX (ug/L) <05 <05 <05 5030-602 <br /> Groundwater Elevation (feet)/Flow Direction -36 39 -3682 -369 North <br /> NO VEMBER 1991 <br /> TPH-d (ug/L) < 50 < 50 < 50 3550-8015m <br /> BTEX (u /L) < 03 < 03 <_63 5030-602 <br /> Groundwater Elevation (fest)/Flow Direction -3668 -37 19 -3716 Northeast <br /> FEBRUARY 1992 <br /> TPH-d (ug/L) < 50 < 50 < 50 3550-8015m <br /> STEX (ug/L) < 0 3 < 03 < 0 3 5030-602 <br /> Groundwater Elevation (feet)/Flow Direction I N/A NIA N/A N/A <br /> MARCH 1993 <br /> TPH (ug/L) I < 50 < 50 < 50 NA-DNA <br /> Groundwater Elevation ifeet)/Flow Direction 1 -36 96 -3759 -3761 Northeast'* <br /> MAY 1993 <br /> Oil & Grease (ug/L) < 50 < 50 < 50 5520 <br /> TPH as Diesel (jug/L) < 50 < 50 64000 8015 modified <br /> Groundwater Elevation (feet)/Flow Direction -35 13 -3570 -3575 Northeast <br /> MARCH 1995 <br /> TPH-d (ug/L) < 50 < 50 84" <br /> a a 0 5030-8015m <br /> TPH- (ug/L) < 50 < 50 N/A 5030-8015m <br /> BTEX (ug/L) <05 <05 N/A 8020 <br /> Groundwater Elevation (feet)/Flow Direction -31 57 -32 17 -3229 Northeast <br /> JUL Y 1995 <br /> TPH-d (ug/L) < 50 5600000 < 50 5030-8015m <br /> TPH-g WWI-) < 50 < 50 < 50 5030-8015m <br /> BTEX (u /L) <05 <05 <05 8020 <br /> Groundwater Elevation (feet)/Flow Direction -2958 -3014 -3007 North <br /> 0 According to Final Site Assessment Report (ERM-West, March 1991), Total Petroleum Hydrocarbon <br /> detections are not diesel <br /> 00 Flow direction incorrectly diagrammed on the ERM-West report as flowing south-southwest <br /> 000 Unidentified hydrocarbon (>C14) <br /> 0000 Unidentified hydrocarbon (C12-C19) <br /> 0 0 0 0 0 Unidentified hydrocarbon (C9-C24) <br /> NA = Not Available <br /> NIA = Not Analyzed <br /> g lg`gilchn8I\GWMONSUM }CLS Page 1 <br />