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�GRO <br /> Jeff Granberry <br /> September 26, 1995 ( 9447-8620) <br /> The calculated volume of petroleum hydrocarbons removed from the site using free <br /> product removal and soil vapor extraction is approximately 2,720 gallons <br /> 4.2 Petroleum Hydrocarbons Removed During Overexcavation <br /> Soil Excavation and Sampling Summary <br /> In order to calculate the mass of petroleum hydrocarbons removed during the <br /> overexcavation at the site, the impacted soil was divided into the following three zones <br /> Zone 1 the limits of Zone I are defined by the former UST overexcavation The <br /> dimensions of the overexcavated area are approximately 48 by 44 feet to a depth of <br /> approximately 15 fbg Approximately 1,044 yd' of soil was removed from this area The <br /> top of the four tanks was 4 fbg, while the bottom of the tanks was I fbg The <br /> excavation was carried out to about 4 feet below the bottom of the USTs <br /> Ten soil samples were collected on May 4, 1995, from around the perimeter and in the <br /> central portion of the excavated zone at depths ranging from 13 5 to I8 fbg The ground <br /> water level at the site was encountered at approximately I I fbg, so the samples were <br /> . retrieved from below the ground water surface <br /> Zone 2 the limits of Zone 2 are by the new UST excavation The excavated zone <br /> measured about 35 feet square down to about 15 fbg Approximately 666 yd' of soil was <br /> removed from this area to allow for the installation of the new USTs Four soil samples <br /> were collected from the Zone 2 excavation stockpiled soil on May 8, 1995 <br /> Zone 3 Zone 3 is defined as the area excavated near the former underground product <br /> pipelines The depth of the excavated zone varied from 3 to 8 fbg The product pipelines <br /> were encountered at 2 fbg Approximately 360 yd of soil was removed from this area <br /> Seventeen soil samples were collected from this area at depths ranging from 1 5 to 9 fbg <br /> on May 17, 1995 <br /> Since the bottom of the former USTs were at approximately I 1 fbg, only the soil removed <br /> from 11 to 15 fbg will be considered impacted for Zone 1 and Zone 2 This assumption will give <br /> a conservative estimate for the amount of petroleum hydrocarbons removed with the soil from <br /> these two zones For Zone 3, all the soil removed from the former product piping area will be <br /> considered impacted by petroleum hydrocarbons <br /> 94478620 ARP - to - <br />