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NWW <br /> TABLE 3 <br /> GROUNDWATER MONITORING WELL <br /> LABORATORY RESULTS <br /> 1991 THROUGH 1993 <br /> (Results in parts per billion) <br /> WeII ID Sarnle Date Benzene 'ColX <br /> uene y yen <br /> benzene les Gasoline <br /> RW-10 01/12/90 -- -- --01/25/90 1.0 2.0 <0.5 19 49 <br /> 02/09/90 <0.5 <0.5 <0.5 3.0 11 <br /> 03/07/90 -- -- -- -- -- <br /> 04/04/90 -- -- -- -- -- <br /> 05/01/90 <0.5 <0.5 <0.5 4.0 27 <br /> 06/01/90 -- -- -- -- -- <br /> 07/19/90 -- -- -- -- -- <br /> 08/24/90 -- -- -- -- -- <br /> 09/24/90 -- -- -- -- -- <br /> 10/23/90 -- -- -- --11/27/90 -- -- -- <br /> 12/28/90 -- -- -- --02/21/91 -- -- -- -- -- <br /> 05/27/91 -- -- -- -- -- <br /> 08/26/91 -- -- --11/26/91 -- -- -- -- -- <br /> 03/30/92 -- -- -- -- -- <br /> 06/29/92 -- -- -- -- -- <br /> 12/23/92 -- -- -- -- -- <br /> 07/30/92 -- -- -- -- -- <br /> 09/30/92 -- -- -- -- -- <br /> 12/23/92 <0.3 <0.3 <0.3 <0.5 <10 <br /> 04/02/93 <0.3 <0.3 <0.3 <0.5 <10 <br /> RW = Recovery well <br /> MW — Groundwater monitoring well <br /> ppb — Parts per billion <br /> TPH = Total petroleum hydrocarbons <br /> PW = Pumping well <br /> -- - Not sampled (not accessible or insufficient water) <br /> Note: ■ Monitoring Wells MW-2, MW-3, and MW-4, have been dry since 1987. <br /> ■ Monitoring Well MW-10 has been dry since 1990. <br /> ■ Monitoring Wells MW-11 and MW-14 have not been sampled since July of 1990, <br /> because concentrations of benzene and TPH-as-gasoline had been below the <br /> method detection limits since December of 1988. <br /> ■ Monitoring Well MW-12 has been inaccessible since 1987 and is no longer in use. <br /> ■ Recovery Well RW-1 was used as a vapor extraction well from January 1990 through <br /> January 1991 and not accessible for use until December 1992. <br /> 1211TRB3.SLL Page 17 of 17 <br /> GROUNDWATER <br /> TECHNOLOGY <br />