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• <br /> tested bel ow report I ng I i mi ts . Refer to tab] Q { 1 I for a summary of <br /> both tests. <br /> PLUME SIZE AND CONF I DURA-r I ON: <br /> The writer d 1 d not witness the removal of the tarW , when it was <br /> rioted that there was some d3 scoloration to the sai i . During the= <br /> re-e*,cavation operation , no visable discoloration or free product <br /> wa,-i noted; there was A qAsol 1 ne odor pressen t , bUt I fy via not <br /> Possible to determine the e- act iocat7 on of those odors. Fibove a <br /> depth of about 10 , the odor waw more pronounced; below that depth <br /> it became fainter and 4 a1 nter , w) th the strongest odor towards the <br /> south wide of the e ravata, on. -11-10 character of the sediments <br /> encUUntereo calci not Indicate any di Ft j nct zones or layers of h3 clh <br /> permeability , and no f reu product was observed during the sped l <br /> removal , although a- mentioned earlier- , Some wcs noted in set ec_ted <br /> samples. <br /> E51' t MA-f L OF AMOUNT OF FHODUC F LE=AF A(--,h_: <br /> T1iere are no r ecorda available to In(11C,_1tQ the RMULAnt of 1 (_.,aW aqe , if <br /> any , during the vears the team was Ira 1-E-r-JIC('. Because the tanF <br /> integrity was confirmed 3(_(sat prior- to removal , it is as,.aumed Lhat- <br />• any product leafage occurred either In the product line to the pump <br /> island , (which was determined to be teal ing during the test , ) or <br /> ad3acent to the pump island. <br /> CONCLUSIONS: <br /> 1 . All of the samples`, from the c-, cavatlon tested cican for both <br /> Ethylene G1 brf.)mi de And or gang c lead. <br /> 2'. Only one sample, SW--2W, had dete?cta bl e levels o4 i FH-G. <br /> An analys} _.; of the L.UF-T manurial procedures for esti (natlnq <br /> contamination l eve I s that can be left i n place without threatening <br /> Ground water reveal that only two components in the bottom samplea <br /> slightly e teed the limits derived from -rtable 7-1 of that manual ; <br /> Toluene and Xylene in sample b--:`S. 011 cither components fall be L o w <br /> thE* 11mits; (F hi bit F . ) <br /> 4 . The soil type, Stocl ton AdobE­ Liay , has a low Intorle Indo— , and <br /> Imgertec.t dra) narle; it appears (_anis l eel v that ver tical or hor7 _contal <br /> fla_(id migration thrOUgh such wa medium wouLd be /ery e tens'sve. <br /> `,. Additional s;,poi l removal and 5amp 1 1 ng i -. necessary from the west <br /> and of the site. <br /> RECOMMENDATIONS: <br /> The writer is in agreement w3 th the enclosed letter from Mr . Vosf es <br /> of N o r M IC Inc. , propose ng additional spc),_ L removal f r cpm the <br /> t) <br />