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I <br /> Mr Knoll <br />' February 19, 1999 <br /> Page 5 <br />' can not be determined The MTBE detected in groundwater could not originate from the BFS tanks because <br /> MTBE was not used in the United States until 1979, 12 years after BFS discontinued the use of the tanks and <br /> the tanks were abandoned (Keller, 1998) <br />' CONCLUSIONS <br />' Based on field observations and analytical results, the soil beneath Tanks 2 and 3 appears to be impacted with <br /> petroleum hydrocarbons However, the impacted soil is limited to beneath the tanks verified by previous <br /> Borings PB3 and PB4 and QST Borings BFS-1 and BFS-2 Low concentrations of TPH, BTEX and <br />' oxygenates were detected in the groundwater sample collected from Boring BFS-1 but not from Boring BFS-2 <br /> Because of the detection of oxygenates in the groundwater, specifically MTBE, the petroleum hydrocarbons <br /> could not originate from the BFS tanks since 1) MTBE was not used in the United States until 1979, 12 years <br />' after BFS discontinued use of the tanks and the tanks were abandoned and 2) MTBE was not detected in soil <br /> Furthermore, groundwater in the vicinity is known to be of poor quality and there are no active supply wells <br /> within a 1 mile radius <br />' Therefore, based on the results of the additional assessment and the site history, QST requests no further action <br /> be required at this site and that site closure be granted <br />'. 0 0 0 0 0 <br /> Our professional services have been performed using that degree of care and skill ordinarily exercised under <br /> similar circumstances by other geologists and engineers practicing in this field No other warranty, express <br /> 1 or implied, is made as to the professional advice in this report If you have any comments or questions <br /> regarding the contents of this report, please call the undersigned at(714)426-9000 <br />' Sincerely, `""° <br /> QST ENVIRONMENTAL PE� GFO <br /> WC? O5�T SCO 0�'� <br /> cC No 5421 � <br /> t <br /> Kathryn A Cross Susan S Wickham 9 EXP�� <br />' Protect Geologist Senior GeologistOF Cp <br /> ,FO <br /> California Registered Geologist No 3$51 <br /> •L <br /> 1 NIdatalpmjectslbndgestnlstocktonlbfsdoc <br /> 1 <br />