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�eCember 22, 1998 41017 002 Mr HS/EiHD el Kith Page 4 t"tard'" Law'son Associates On July I3 1998, HLA submitted, via facsimile, the over July Margaret Lagor,a of the Site Mitigation grow excavation and sariiplin ry p Ms Lagorio approved thew,rko k Plan (HLA, 1998d)to On Jul , P on the afternoon of onsite Y 13 1998, the remaining UST sidewalls and bottom were The piping associated with e removed from tracks T}te , in the UST`vas removed back to were it tv p p was cut at this the excavation and stockpiled The removed piping was steam-cleanedtas dee with Gout, and the ends bent over and scatent under the adjacent railroad 1998, overexcavation of the rim of ii7i a hove and rinseate scaled with cold w Operator had been instructed that during the sods was performed and groundw Leri was no onsite weld encountering groundwater g the overexcavation process to avoid di On July 14, encountered The On Jul digging to deeply and potentially Y 15, 1998, Mr Kith and Ms La samples (T-5 through T-16 gor'o of the PHS/E (T-5 and T_s Hz] directed the collection of twelve additional soil were from the locations shown on Plate 3 Portion of the excavatiolncted from soils that had been beneath the c The tyvo remaining UST removal samples depths ranging overexcavation of im concrete bottom of the UST in the northern the fo g 8 from approximatel 8 5 pacted soils resulted in a circular variable- rrrir UST sidewalls Y to 10 5 feet bgs This ditch w whether overexcavation had m remainingas located in width dace with 10 samples (T-7 through T_ the area immediate! one) was collected to chemically ed su�cient im 25) were confirmation Y airsess Y Profile the stock pacted soil On Jul rrnation samples to assess pile of Impacted Y 1h, 1993, a composite sample (four-to Based on the analytical results (discussed below pacted soils for offsite disposal concentrations ofTPk-1 The two areas were olid ttvo areas wre indicated to have soil with north east(sample 1'-H sides of the excavation g the ditch these two areas le avoid sidesencoof the on the northwest(samples T-g nd Tt9l'1e (Plate 3) Additional overexcavation r ) and arrived onsite to observe the final round confirm On JuI to collect Y 21, 1998, Mr Harlin Proceeded carefully m samples in the two remainin im rination samples The u Knoll of the PHS/EffD impacted soil in these areas g pacted areas that would define the vertical and tat P rpose of the final sampling round was the excavation and samples T 2l throe ples -17 throw $ 23 tv�e ad�ctea aio llected aloe eras extent of excavation g the ditch iii g the ditch in the northeast side of the side of the northwest The final shape ofthe excavation was ranging ftom approximate) roughly circular with a di excavation had a de Y $ 0 to 11 5 feet b diameter of approximate) 90 pth of gs Groundwater tvas not encountered Y feet and depths of approximately 70 feet y 8 feet bgs, this consisted of the area beneath the mafoMY°f the The remainder of the excavation consisted of a circular overexcavation of impacted soils The ditch teas Iocatad e UST With a diameter range of aPProximately 8 0 to 11 5 feet b ditch resulting from and soils encountered during excavation activities exhibitedlust outside of the former sidewall and it had a depth gs LirhologieS of samples collected during borderline clay/slit ranging similar Iitholo i g these removal activities or clayey from reddish brotsn silt Y y silt contained S to percentY clay to clayey es Soils were fine-grained and dark grayish brined discoloration thfine-grained sand y y silt, whereas occasionally the silty Locally within apparentlyImpacted t3 clay and as observed soil, dark gray