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• .SET <br /> H *" <br /> �t7�IlY-t 11, Ilii <br /> 1,41,Clint Rot ole Inge 5 <br /> 0?3,0 14A7 <br /> accom#stinicitf by a C1,:tin of cu:tcxly rt,:s,l+':1i:.t during Iran' <br /> 4.0 <br /> i,ruS ns+.aty:.rx! for TP:a•G ttrrl E3T£:X by L-PA <br /> ntetncxls 5rsaoli�adnfl�t5 <br /> 4.0 SITE CONDITIO#fa <br /> 4.1 11yDROGEOLOGY <br /> Thu aeu is toc11cd In the nonhern pian of tliG Sadim Valley <br /> y marine datpo5rlsicv oda nl y 1.110 <br /> 12 lent. The Waitay Ili consists of late l tcsozoic throisgh Eocene <br /> Tani<iry orx! Quaternary dorTtzitu <br /> inantly n0Wrttarine deposits,ahiCh uvuatlY cots a ntain f eonsµt o(ra'Ifluvrai grate! <br /> Area.the!ato Cenozoic depo~.�$010 BPprOxun.,tely 3.oDE1 lett thick and q Y <br /> sand,s t.and clay. <br /> Grourxi+:ater In these mitwi5l depo•..Its Is usually unccnfinc�cl ta,arnicunhncd.frxtens va <br /> Catcoran Clay..�ccur In Sart JoaqulnYa,ay. <br /> pilo-Pleistocene#acustrina deposits.including the dailorrtaceoux <br /> +,ouch of Stockton. Thu water beneath the clay bod is usually corttirtcd. <br /> The rttaFerial5 punrntrattd to A depth pf 70 teat duringr <br /> depth <br /> g At nbor�Iie rja dO fectare ln Fall n°����tas5txtatn <br /> tenses of sand and Sgt. The water table.which Was at a dap <br /> declining Ord was bund at ap#:roxlrrtataly 55 lee,bela#v grade in I.tti'j•9 in July 1991. <br /> 4.2 RESULTS OF SOIL ANALYSES <br /> ht of the 111ne samptes artatyzed from bortN PJW-9. benzone <br /> HydrocaFborts were detected In c� The same sample also <br /> was detected only in tYe mampte couoctad from a depth 0126 tact (1.7 Iz�')• 05 irorlt 21 and <br /> contained 14 ppm total lead. Highest TPH•G ecncentrattots TrH G concent s:arts deto dotectcd in I"two ee f3sad in samp:a$ <br /> 26 feet botow grade,560 ppm and 3.90 0 Ppm,respectively. <br /> euiioctad between 31 feet r rtd 51 feet from 49 PPM to 2 ppm, tno sample coi,octod at 71 feat did not <br /> rest;;!$of so:s samples from NW-9 <br /> c�itn any h).dr=eoo ns abase the method detsctson k and <br /> -1 'I'Laboratory V-4 are sumrnz-16zed in Table 1 <br /> arxl the Previous resu:ts limn f,'W1 through f1' •tj, and V t iluoucJ ndix f]. <br /> (Appendix B). The laboratory reports for tho ges arc enclosed in A pP <br /> p[ s jecofded during the and cur" <br /> Results of laboratory analyses of 564 �m e �tC#y 5�ent d TPM G <br /> investigations indicate that raper extraction from the$a has rennvs+ rtxad atX�o in letSOJ r>car the canter of the <br /> and 99 percent of BTEX in the area of highest c.once.vraiions of hydfr oca <br /> 544,in 11nC Area bcrNeen Me backlUd tank p=t arsd the 1wrref pump rsr—4s, <br /> 'Ft:CfI;�iN�F K'1.1�C <br /> .�•,,rn sw"C <br />