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May 4, 1993 <br />. Unocal Station No 6981, Stockton, California Working To Restore Nature <br /> TABLE 6 <br /> HYDROCARBON CONCENTRATIONS IN GROUND-WATER SAMPLES <br /> Unocal Service Station No 6981 <br /> 4707 Pacific Avenue <br />' Stockton, CaLforma <br /> (page 4 of 4) <br /> Sample Ethyl- Total <br /> Number Date TPHg Benzene Toluene benzene Xylenes <br /> W-54-MW10 08/19/92 <50 <05 <05 <05 <05 <br /> 10/21/92 <50 <05 <05 <05 <05 <br /> 01/13/93 <50 <05 <05 <05 <05 <br /> W-56-MWll 08/19/92 <50 <05 <05 <05 <05 <br /> 10/21/92 <50 <05 <05 <05 <05 <br /> 01/13/93 <50 <05 <05 <05 <05 <br /> W-56-MW12 08/19/92 <50 <05 <05 <05 <05 <br /> 10/21/92 <50 <05 <05 <0 5 <05 <br /> 01/13/93 <50 <05 <05 <05 <05 <br /> W-57-MW13 08/27/92 <50 <05 <05 <05 <05 <br /> 10/21/92 <50 <05 <05 <05 <05 <br /> 01/13/93 <50 <05 <05 <05 <05 <br /> Pumping Test Well <br /> W-55-PTWl 8/17/92 <50 <05 <05 <05 <05 <br /> W-55-PTW1 8/18/92 <50 <05 <05 <05 <05 <br /> W-56-PTWI 8/19/92 <50 <05 <05 <05 <05 <br /> Hydropunch Sampling <br /> W-62-MW12-HP 8/11/92 <50 <05 <05 <05 <05 <br /> HP-B16/MW-11 8/12/92 <50 <05 <05 <05 <05 <br /> HP-Bl5/MW10 8/13/92 <50 <05 <05 <05 <05 <br /> Baker Tank <br /> BT 8/19/92 <50 <05 <05 <05 <05 <br /> Results in parts per billion <br /> TPHg = Total petroleum hydrocarbons as gasoline <br /> NS = Not sampled <br /> Sampling events on 10/21/92 and 01/13/93 performed by GeoStrategles Inc <br /> * = Positive results for petroleum hydrocarbons as gasoline does not appear to have a typical gasoline pattern <br /> < = Below detection limit for analytical method used <br /> Sample designation <br /> I W-56-MW-9 Water sample - sample depth (feet below grade) - well number <br /> . HP-B16/MW-11 Hydropunch sample - boring number/well number <br /> 38032-13 <br /> I <br />