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TreadvveIER0110 <br /> t5.0 PROPOSED REMEDIAL WORK <br /> ' 5.1 Summary of Identified Contamination <br /> Significant soil and groundwater contamination has not been identified at the immediate site <br /> area The data do indicate that high concentrations of petroleum hydrocarbons are present in soil <br /> and groundwater in the sidewalk of West Fremont Street, adjacent to the northwest portion of the <br /> Site (borings CSB-2, CSB-3 and B-3) This sidewalk area is adjacent to the former gasoline <br /> service station location shown on Figure 2 <br /> In the 14 borings conducted at and adjacent to the site, only two soil samples collected above the <br /> water table (located at approximately 18 5-feet bgs) contained detectable concentrations of <br /> petroleum hydrocarbons TPH-g was detected in the 16 5 foot bgs sample from boring CSB-2 at <br /> 1,700 mg/kg, and in the 15 foot bgs sample from boring B-3 at 2,000 mg/kg This indicates that <br /> a potential source may have been present near these borings Sidewalk-located tanks were <br /> commonly used at service stations in the 1950s and 1960s, and boring logs for CSB-2 and B-3 <br /> show that sand fill is present down to 10 feet in this area, deeper than in other borings at the site, <br /> i <br /> suggesting that tanks may have been located in this area However, a source has not yet been <br /> positively identified <br /> No significant soil or groundwater contamination was detected in Boring CSB-5, located <br /> 1 approximately 10-feet from the property line at West Fremont Street, and 16 feet south southeast <br /> of boring B-3 This indicates that the identified contamination in the sidewalk along Fremont <br /> Street likely extends less than 10 feet on to Site <br /> 5.2 Other Potential Contamination Sources <br /> The analytical laboratory generally qualified the petroleum hydrocarbons as TPH-d and TPH-g, <br /> but qualified the detections as not matching the standard pattern for either compound, and stated <br /> the pattern most closely resembles a stoddard solvent standard (similar to kerosene) No benzene <br /> has been detected in soil or groundwater during this or AGE's investigation Stoddard solvent is <br /> 7 <br /> �� 25971013 DGD 12 April 2004 <br />