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i <br /> 1 <br /> limited distribution of petroleum hydrocarbons around the tank area Soil samples collected and <br /> analyzed from the borings were located from 14 to 15 5 feet bgs The samples were analyzed <br /> by EPA method 413 2 Results indicated concentrations between 3 and 8 parts .per million <br /> (ppm) Soil boring S-1 at 14 to 15 5 feet bgs had a TPH concentration of 260 ppm. No other <br /> ' soil samples collected from S-1 were analyzed The groundwater sample from Well S-1 <br /> contained BTEX compounds above state action levels <br /> ' The presence of petroleum hydrocarbon compounds in the soil and groundwater beneath the site <br /> prompted a second site assessment, which was conducted by Applied GeoSystems in August and <br /> September 1987 This second phase consisted of the drilling and installation of two additional <br /> ' groundwater monitoring wells (MW-1 and MW-2) Groundwater sample analyses from these <br /> wells confirmed that TPH compounds were present in the groundwater beneath the site The <br /> groundwater gradient was reported to be in a north-westerly direction <br /> ' As a result of these findings PHSIEHD requested that a quarterly groundwater monitoring <br /> program be initiated for this location, and that all domestic groundwater wells within 2,000 feet <br /> ' of the site be identified and sampled Six domestic wells were located and sampled Test results <br /> presented in a May 13, 1987 letter report prepared by Applied GeoSystems were non detect for <br /> TPH and BTEX The next quarterly sampling could not be performed because the groundwater <br /> table had declined below the bottom of the monitoring wells <br /> 3.3 Area Background <br /> Prior consultants have indicated that all four corners at the intersection have had operating retail <br /> gasoline service stations on them at one time or another No site assessments have been <br /> ' performed at any of these other corners <br /> t The northeast corner is occupied by an abandoned Chevron service station This station is <br /> fenced in with an open pit where underground tanks have been removed A record review of <br /> County files indicates that there is an outstanding request for further charactenzationl at this site <br /> ' The northwest corner is reported to be the site of a former Shell service station The property <br /> is presently an open field with no indication of prior use A review of County records did not <br /> ' produce any information about this property, as the abandonment of this site appears,to pre-date <br /> underground tank regulations <br /> The southwest corner has what appears to be an abandoned gasoline service station The <br /> property is fenced A review of agency files did not produce any information about this <br /> property A discussion with County staff yielded a recollection that the property owner had been <br /> ' queried about the presence of underground tanks on site and the County had been informed that <br /> all tanks had been removed No verification was apparently provided and no follow-up was <br /> performed, as the abandonment of this site appears to pre-date underground tank regulations <br /> B 112511 noir 3 <br />