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1 groundwater samples from MW-2 and all bore holes Some of the groundwater samples showed <br /> r <br /> r . contamination from oil However, since the sampling in 1997, oil has reached groundwater in <br /> r MW-2 as evidenced by significant floating oil present in September 1998, December 1999 and <br /> January 2000 Since that time floating oil has been removed and reduced significantly <br /> I <br /> r Table 4. Sierra Pacific Groundwater Sample Results from Report of Investigation Dated 4 February 1997. <br />` Sample <br /> I ID MTBE BenzeneZ Toluenez lEthylbenzenezi X lenesz ETR; ' TOG3 <br /> B-1 NA NA NA NA NA NA NA <br /> B-2 1.59 00094 ND 0.0003 00013 0.361 ND <br /> B-3 0 925 1 0.273 0.0015 0.0008 00035 0 359 NA <br /> B4 158 1 00015 ND ND ND 0 157 NA <br /> Notes All results shown to ppm <br /> 'Detection limits for analyses on this sample were 0 05 ppm <br /> 2Detection limits for analyses on this sample were 0 0005 ppm <br /> f 3Detection limits for analyses on thus sample were 1 ppm <br /> ND=Not detected at or above the indicated laboratory detection linut <br /> NA= Sample was not analyzed <br /> I <br /> h All groundwater samples extracted by El were analyzed for total petroleum hydrocarbons as <br /> diesel, oil and gasoline (TPHg, TPHd and TPHo) by EPA Method 8015 These groundwater <br /> samples were also analyzed for benzene, toluene, ethyl benzene and total xylenes (BTEX) by <br /> EPA Method 8020, and Methyl tert-Butyl Ether (MTBE)/oxygenates by EPA Method 8260 <br /> I <br /> 3.3 Floating Oil <br /> i Floating oil found in MW-2 was removed on five separate occasions throughout the first quarter <br /> The amounts removed are as follows <br /> Date Amount <br />' 27 January 2000 1 gal <br /> 16 February 2000 1 gal <br /> 17 March 2000 0 5 gal <br /> 7 April 2000 0 5 cup <br /> 20 April 2000 1 Cupp <br /> Total 2.6 gal. <br /> Environeenng.Inc Protect No 00405 06 Page 6 <br />