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TR <br /> —?� <br /> ,a..Lass t� rvacev4 �M' r <br /> hydrocarbon IT1111) Contamination doers net genernily require immedin:n <br /> additionnl action. Board ongin"ra rmnhnsuo that thin do-um not mean that <br /> name nction might not be raeloired it, .he future. Stili, the pita is ansi¢rirfi <br /> n tow priority unless it in situated In an nren M high hydrogeollogic <br /> cancern. <br /> The detection of more than 100 ppm TPH in [he native poli btincnth a tnr,h in <br /> generally considered grounds for requiring; .,in additional Investigation in the <br /> form of soil borings and Installation of at lrnst ona groundwnter monitoring <br /> well fulls ad by periodic monitoring. 'T).a d(•teetinn of 110C.`U ppm TP)t III <br /> unuclly viewed by the €3ot+rd on an Unaeseptnble lovel of fuel Cnturntion which <br /> will aiandat�; excervition of the effected ground down to the f rthest <br /> practicable reach of conventional excavating machinery followed by soil <br /> taarings abid Inttalletion of gruundwator monitoring wells. <br /> Other regions use different stondardt� for detertr.lning when u groundwater <br /> Investigse.ion well be required. For esxample ban:ane is eftcn u,ad in lieu of <br /> TPH. Even very low luvr'es of benzene aro c;ften seen an grounds for requiring <br /> a subsurface Investigation. Thine criteria may be ralaxtid or stiffened <br /> depending on the location of the Hite In relation to different graundws!tr <br /> systems, the depth to water, type of soil, and the concentrations of bentaner <br /> Involved. <br /> The obov, sthndarti,, apply only to fuck, When samples taken in connection <br /> with an eeaste oil unit or n solvent Ennk are found to contain even amall <br /> amounts of any of the EPA priority pollutants (such ax TCS, PCE, UCE "tc. <br /> which aro ceetacted by FPA methods 8010. 8020, and 8240) mor* stringent <br /> standards are often applied. In these casep, soil borings and monitoring <br /> well installation may be required if there Is any datectable amount t,f Any of <br /> the EPA p;€ority pollutant compounds. <br /> When contaminan.s are found to have reached the Water underlying a eiteR, tlse <br /> Board customarily requ(rets that raddlt`)nal work be unc drL%4L n in order to <br /> define the extent of Etta contamination. <br /> Satnpting 13aport 8$t}SS-C-2 CHEVRON 1918 page 12 <br />