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f <br /> Table 1 <br /> Groundwater Monitoring Data <br /> 1995 to Present Page 6 of 6 <br /> Former ARCO Service Station No. 2168 <br /> 441 Charter Way, Stockton, California <br /> Well ID Elevation Static Elevation Top <br /> &Sample of Top Water of of Ethyl- Total <br /> Depth Date of CasinE Level Groundwater Screen TPHG Benzene Toluene benzene _Xylenes MTBE Observations <br /> NA =Not applicable NS=Not sampled. NE=Not evaluated O=Odor S=Sheen FP=Free product <br /> Analytical results in parts per billion <br /> Measurements in feet. <br /> PHG=Total petroleum hydrocarbons as gasoline <br /> Elevation datum is mean sea level <br /> <=Below detection limit for analytical methods used <br /> *=liaised method reporting limit due to high analyte concentration requiring sample dilution Sam le designations <br /> **=Raised method reporting limit due to matrix interference MW-4 34 -Well ID and sample depth(feet) <br /> MTBE was analyzed using USEPA Method 8260,unless noted otherwise(see below) W-24-MW31t-Water sample sample depth(feet) R=Rmsate blank. <br /> li]=MTBE was analyzed using USEPA Method 9020 <br /> 12]=Water levels collected on 1115199,samples collected on 12/17194 due to equipment failure <br /> 31=Water level collected on 2125100 <br /> I <br /> I <br /> IT Corporation <br /> CP1DataWciuvelARCO1216gkO ftLY12168g100 xls 04/19/2000 <br />