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CAMBRIA <br /> 1,700 ppm TPPH. Complete results of the UST removal are documented in the Fugro West, <br /> Inc. April 19, 1995 Underground Storage Tank Closure Report. <br /> During February 1996, Enviros, Inc. drilled ten soil borings (SB-1 through SB-10) in the <br /> vicinity of the UST complex and the dispenser islands. TPPH was detected in three of the <br /> borings at concentrations ranging from not detected (ND) to 770 ppm. Benzene was <br /> detected in one boring at concentrations ranging from 0.0082 to 0.026 ppm. Methyl <br /> tertiary butyl ether (MTBE) was detected in four of the borings at concentrations ranging <br /> from ND to 15 ppm. This investigation is detailed in Enviros' May 21, 1996 Soil Boring <br /> Installation Report. <br /> TECHNICAL RATIONALE FOR PROPOSED SCOPE OF WORK <br /> • Petroleum hydrocarbons and MTBE have been detected in soil samples collected at <br /> the subject site. <br /> • Groundwater has not been sampled at this site. <br /> • To evaluate the potential presence of petroleum hydrocarbons and fuel:oxygenates. in <br /> groundwater beneath this site, installing one groundwater monitoring well is proposed. <br /> WORK TASKS <br /> Permits: An appropriate permit for drilling will be obtained from SJCPHS/EHD. <br /> iHealth and Safety Plan: A site-specific Health and Safety Plan will be prepared for field <br /> work. <br /> Utility Clearance: The proposed drilling location will be marked and cleared through <br /> Underground Services Alert (USA) prior to drilling. <br /> Site Investigation: One groundwater monitoring well is proposed at the location shown on <br /> Plate 2. As recommended by Mr. Wong during a June 30, 1999 telephone conversation, the <br /> well will be placed in the assumed downgradient direction from the northwest corner of the <br /> UST pit. It may be necessary to move the well location southwest to avoid the station <br /> canopy. <br /> 241-1359 2 <br />