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Grab samples from MW-1 and MW-3 were collected on 22 December 1999 after well <br /> development and <br /> p purging of the monitoring wells as described in the Work Plan dated 28 <br />. January 1999 and the Report of Investigation dated 3 February 2000 The results of the <br /> laboratory analyses on two groundwater samples are presented in Table 4 below <br /> TPH-Diesel was resent in both <br />. p groundwater samples at concentrations of 310 ppm and 110 <br />. ppm Ethylbenzene and xylenes were also found in MW-1, which is located at the former UST <br /> r diesel location <br />. Table 4. Groundwater Sample Results from Report of Investigation Dated 3 February 2000. <br /> Sample TPH- TPH- Motor <br /> ID Gasoline' Daesel° Oils3 MTBE BenzenO TolueneZ Ethyl 1 Total <br />. Benzene' Xylenesz <br /> MW-1 ND 310 ND ND ND ND 00025 0 004 <br />. MW-3 ND 110 ND ND ND ND ND ND <br /> Notes All results shown in ppm <br /> 'Detection Iimits for analyses on this sample were 0 05 ppm <br /> 'Detection limits for analyses on this sample were 0 0005 ppm <br /> aDetection limits for analyses on this sample were 1 ppm <br /> °Diesel detection limit 0 5 ppm <br /> ND= Not detected at or above the indicated laboratory detection limit <br /> The following table from the Sierra Pacific report completed in 1997 is included here to provide <br /> information regarding the extent of contamination at the site <br /> These data show relatively moderate levels of MTBE, BTEX and gasoline contamination in the <br />' groundwater samples from MW-2 and all bore holes Some of the groundwater samples showed <br /> contamination from oil However, since the sampling in 1997, oil has reached groundwater in <br /> 1 MW-2 as evidenced by significant floating oil present in September 1998, December 1999, <br /> 1 January 2000 and April 2000 Since that time floating oil has been removed and reduced <br /> significantly <br /> 1 <br /> 1 <br /> 1 <br /> 1• <br /> Environeenng,Inc Project No 00-008 07 Page 5 <br />