Laserfiche WebLink
• 20 March 1996 <br /> 1 AGE-NC Project No. 95-0108 <br /> Page 6 of 7 <br />' excavation at ranging depths from 24 to 28 feet bsg. Soil samples were collected using a metric soil <br /> P g g <br /> sample pre-loaded with two clean 2-by 3-inch-brass sleeves. Upon collection, the ends of the leading <br />' brass sleeve were covered with aluminum sheets, capped and sealed with tape. The samples were <br /> placed in a chilled container and transported under chain-of-custody to MAI and were analyzed for <br /> TM-d and BTE&X in accordance with EPA.methods 8015 and 8020. <br />' TPH-d and BTE&X were detected in three of the four soil samples at concentration as high as 21,000 <br /> ppm (TPH-d, OX4-2). Analytical results of the soil samples are summarized in Table 4. The <br />' laboratory results(MAI Lab ID 52051 to 52024) and chain-of-custody form are included in Appendix <br /> E. <br /> 4.0. CONCLUSIONS AND RECOMMENDATIONS � <br /> 1 4.1; FORMER UNDERGROUND STORAGE TANK. AREA. <br /> Although at least four separate excavations of the former UST area have been performed, additional <br /> hydrocarbon-impacted soil is still in place on the site. Furthermore, the lateral and vertical extent of <br /> impacted soil east of the excavation has not been assessed. <br /> We recommend installation of several soil borings or soil probe borings at the site to determine the <br /> lateral and vertical extent of hydrocarbon-impacted soil. A sufficient number of soil samples should 0 <br /> c <br /> 1 be collected and analyzed to perform mass-balance calculations and determine if the remaining <br /> hydrocarbon-impacted soil can be left in place with no significant effect on ground water. A Work" <br /> Plan proposing the investigation should be submitted to the PHS-EHD. <br /> 1 . <br /> 4.2_ STOCKPILE SOIL <br />' <br /> Presently, between 1 000 and 2 000 cubic yards of h drocarbon-im acted soil is stockpiled on-site. <br /> P y, Y Y P P , <br /> Results from the most recent sampling of the stockpiled soil, performed by AGE on 14 April 1995, <br />' indicates that petroleum hydrocarbons continue to be present in the soil. It is our understanding that <br /> the soil is presently uncovered and aerating. However, because the primary contaminant in the <br /> stockpile soil is diesel(longer•-chain hydrocarbons), it is unlikely that aeration alone will attain clean- <br /> up goals.- <br /> We recommend resampling of the soil and, based upon results of the analyses, submittal of an ex-situ <br /> 1 soil remediation plan. <br /> 1 <br /> i <br />