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Wall <br /> -.. 10, <br /> _ sj; .-. _-a'z = MR. <br /> .s. - <br /> ;d. FIELD Il1VL"STIG7jTI011S <br /> 2.1 RY DROGE01.0 n <br /> The genoral geology around the !larding Nay bite consiats of a <br /> thick sequence of river channel and flood <br /> 1plain <br /> iitdepisits. These <br /> clay layers. <br /> acquences contain Interbedded sand, g <br /> The site overlies as old slough that once ran &%long the north <br /> 5:,'o of haidinq Nay. fill hene6th the alto reaches nine feet ire <br /> depth at vapor pipes ooe and two. A stiff clay underlies the <br /> till. <br /> 'nosed on a search of t%. 0 calif->r.:ia Dnp,,rtment of Nater <br /> Rezource'a records, there are Leven wells within a half -mile <br /> radius of the sites (Table 2; . Twt of these wells basong tts <br /> California Nater Service. One "ell "as a static va"e r level of <br /> x41 feet, but it fa not in use. Tiro ocher has been peras- nently <br /> closed, preautably because of p,>or production. Thema. welln <br /> showed no indication cf infiltration by poor qusslity Delta wstmz. <br /> i Three private wells in the area ase uae:d for domestic purposes, <br /> Chore is no inlo_ation on the other two wells. <br /> 4 and 2, near the tank field at the <br /> Existing monitoring wells 1 <br /> q <br /> site were drilled to nine tact. They are both dry wells. No <br /> sccarda of their instalxation have been released to EA. ' <br /> 2.2 SOIL VAPOR COIrrArlIRW ASSESSMENT <br /> joj1.._vapox--ssusvey,---or S ►, technique take:= advantage c: ttie <br /> behavior of hydroctzbon mixtures and the phyaicochoaxical proper- <br /> ,i ties of t%o individual cozpo <br /> Heats in the subaurtace. F'pilowing a <br /> subsurface gaaoli�,e reieaSej free product will mig;'ate dovnwsxds <br /> tovards the groun.i water, some of the gasoline will vQlnCiiixa, <br /> and some will adsorb to th6 Boils- in the cane of a spill of <br /> C01G:81A <br />