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�T pr_ M .,.__„N eyars _. t'tu7u' ` ,„r.�. .� '?y::e} rr"U "•St OWN §fit e Fa W initial tank pit sampling white reported nine of and product line samples with BTEX and TPHD ten tarp_ below method detection limits indicates that catastro leakage of diesel concentrations The 650 Product has not occurred at this plic west end Ppm TPHD concentration in the 13 foot sampls �jS+�te. b of the middle tank (Sample MDW)is bounded at depth Y clean samples to the nort2i shallow dispenser/Product line samples Southand the ewest.an These contaminated soils appear to have largely during the re-excavation been removed extremelyoperations as exhibited by the low to nondetectable BTEX/TPHD levels in a 16 foot located adjacent to sam�,le MDyq, Due to the public sidewalk whicof the h prohibited further westward excavation j some low level contamination remains in soils at a i ` 6.0 feet. The residual soil contamination which remains of in Place, 30.6 ppm (EXZ/WW6) although limited in areal s in does provide a potential source of contamination, extent groundwater The field inspection and laboratory collected from the well boring analysis of ' hydrocarbon contamination to the astMWl) indicate soils waste oil tank side of that subsurface. The ....resulted from the former Ppm concentration of TPHD aandg a the ,., of TEX and two semivolitile � Presence 12.5 foot sample consti.uents in the initial significant contamin tion heeed d o currt at thi g tank removal Indicates low levels of TPHD ( io s depth. The BTEX, chlorinated hydrocarbons and and seri tvolatile levels of indicates the high levels of contamination are contained i the upper 15 to 20 organics :M concentrations Cd, feet of soil, A comparison of metals and nonshows mated C oils (from the tank pit sample and r-ad Zn in apparently contaminated } shows all samples to be of the MW1 and magnitude. This suggests that same order of contributed to increasing the backgrpund it leakage has not these metals. of The absence of BTEX, TPHD chlorinated hydrocarbons and volatile organics in the angle boringsemi the waste oil leakage did not apparently - southerly direction ASB1 samples suggests beneath the On-site buildingead in a PPm oil and grease concentration in the 17.5 footsample(20 PPm above the method detection limit) does not appear to be w significant in view of the nondetectable levels of 0&G in the and 25.5 the other foot samples and non detectable levels of r constituents tested. The low to non-detectable --BTEX- co:�centrations in same es analyzed (including sample. Won 1 __2. all the indicates, 1), the absence of more volatile hydrocarbons in et) the original diesel/waste oil volatilization or natural degradationphas utaken Place over-' r time. plac 7