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r <br /> 05 October 1998 <br /> AGE-NC Project No. 98-0433 <br /> Page 2 of 4 ' <br /> concentrations of total petroleum hydrocarbons quantified as diesel (TPH-d . <br /> , <br /> Installation of Upgraded_UST System and Dispenser Islands <br /> • Installation of a new UST south of the Operations/Mini-Mart building was initiated on 15 <br /> July 1998. Approximately 350 compacted cubic yards of apparently "clean" soil were <br /> excavated and stockpiled at the east end of the Operations/Mini-Mart building and was later . <br /> designated stockpile"SP4". The new UST excavation was approximately 3 5 feet in length, <br /> 15 feet in width and 18 feet in depth. <br /> • Approximately 275 cubic yards of clean soil were excavated from new trenching advanced <br /> for the upgraded dispenser system. The new trenching connected the ASTs located at the <br /> south end of the property with the new dispensers. This soil was presumed "clean" and was <br /> combined with the existing stockpile SP4. The total volume of`clean' soil in SP4 was then <br /> approximately 625 cubic yards. <br /> Removal of U STs and Southern Dispenser Islands <br /> • On 01 September 1998 three USTs, four additional dispenser islands and associated product . <br /> lines were removed from the site. Approximately 350 cubic yards of impacted soil were <br /> excavated from the UST and southern dispenser area and stockpiled on the western edge of <br /> :the property. These stockpiles were designated as SP1, SP2-West and SP3. <br /> • On 01 September 1998,Gray land Environmental collected four samples from stockpile SPI, <br /> one sample from stockpile SP2-West and eight samples from stockpile SP3. The samples <br /> were transmitted to a DTSC-certified laboratory and composited for analysis. <br /> • On 01 and 02 September 1998 approximately 350 cubic yards of"clean" soil from stockpile . <br /> SP4 was backfilled into the former UST excavation. The "clean" soil was approved for use <br /> as backfill material by Mr. Eric Travena of the PHS-EHD. After backfilling, approximately <br /> 275 cubic yards of"clean" soil remained in stockpiled SP4. <br /> Disposal of Hydrocarbon-Impacted Soil <br /> • On 14 September 1998, approximately 350 yards (550 tons) of hydrocarbon-impacted soil <br /> was transported to'and disposed at Forward Landfill. Impacted soil was removed from <br /> stockpiles SP1, SP2-West, and SP3. Approximately 150 to 175 cubic yards of impacted soil <br /> remain on the site. The impacted soil had been generated by the removal and excavation of <br /> Advanced GeoEnvironmental,Inc. <br />