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V <br /> Mr. Harlin Knoll 'I! <br /> January 13, 2005 <br /> Page 3 of 3 <br /> of petroleum hydrocarbons analytes. Lead was detected at levels ranging from 6.6 to 13 arts per <br /> p <br /> million (ppm), which are considered naturally occurring background levels. The composite r <br /> sample collected from the portion of the soil pile desigated as potentially contaminated (SP-A,B) <br /> contained TPHd at 38 parts per million (ppm) and total lead at 48,ppm. The portion of the soil <br /> j pile designated as clean overburden contained ,total lead at 9.2 ppm, but no petroleum <br /> hydrocarbon constituents. Analytical results for soil samples are summarized in Table 1. <br /> Laboratory data sheets and chain of custody documentation are included in Attachment B. <br /> CONCLUSIONS <br /> The lateral and vertical extent of soil contamination has een defined and the contaminated soil <br /> b <br /> removed. Approximately 175-200 cubic yards of soil was removed from the former UST location <br /> during excavation. No groundwater was encountered during`;excavation. This corrective action <br /> { appears to have been successful in eliminating the threat to groundwater the material posed. As <br /> indicated by the analytical results of the excavation-soil samples, no contaminated soil remains <br /> beneath the former UST, <br /> RECOMMENDATIONS <br /> Ground Zero recommends that the unimpacted portion of the soil pile be used, along with <br /> imported soil as needed, to fill the excavation pit. The fill material�l should be placed in lifts with <br /> appropriate compaction. The portion of the soil pile with document petroleum hydrocarbon <br /> constituents (approximately 50-60 cubic yards) should be transported to a Class II landfill for <br /> disposal. <br /> + Contingent upon proper backfilling and disposal, no furt''er action at the site is warranted. <br /> Ground Zero recommends that EHD issue a Site Closure letter documenting that investigation <br /> and remediation of subsurface contamination associated with'the former UST is complete. <br /> Please contact Ground Zero at your earliest convenience if you have any questions or comments <br /> regarding this report <br /> r <br /> Respectfully, <br /> Ground Zero Analysis Inc. RE� ��` <br /> iop�d P. <br /> LA <br /> ' <br /> o� <br /> John P. Lane (Pa Na. 67zr;)�5 <br /> CA Registered Geologist 6795 's { <br /> Attachments <br /> cc: Mr. Spencer Reynolds,John Ray Company <br /> Mr. Patrick D. Riddle <br /> # G:IGROUNDZEUohnRaylexsum.doe <br /> I� �r <br />