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<br />Mr. ~Rodncy Schurmaia <br />City of San hea~ada~o <br />?2 September 2003 <br />Pane 2 <br />chemical and pLysical cl,~ar-acteristics of the dredne material <br />•~ :;riteria for moisnlrc-condilionin~~ cif dredge mateiials,, includin~~ the need 1'~~r discing and <br />diyir~~; 1,~~c1: the inatcrial <br />~~ c,on~pactioi7 criteria for materi~il placement, including compaction requirelnenis to <br />achieve specified pe~naeability <br />• consb-uction considerations. <br />F~ccause criteria for the landfill cap matcr:al were not mailable at the time this letter was <br />prepared, we will provide beneral criteria and construction, co»siderations for use of this material <br />as an cr.bincered fill.. <br />FIELD ~I~~r~S'~'1~,4TI01~ <br />SlYbsurface conditions a1 the site were e~:plorcd by adva~~c-ing 12 soi] borings, c3esi~nated as B-1 <br />tlar<~uoh B-12, to depths of 2.0 to 3.~ feet below file cxistin~~ Ground surface. (bgs). The <br />approximate locations of thehorin~s arc showy on Figw-e 2_ Tlae borings ~~~erc advanced by our <br />field engineers usinG hand-auger equipment. The hand-auger ectuiprner~t consisted of a tl~rce~ <br />irZC1i-diameter stainless steel auger attached to threaded stainless steel rods. Our f eld enGineers <br />longed the soil encountered and obiai~.zed samples for visual c]assi~_cation and )aboratory teStino <br />by drivin~~ soil samplers with a slide hammer. The boreholes were bacl~wi'illed with bentrnlite <br />chips. Soi! cLrttings were spread on die gro~~~nd surFace, around the borehole. A ,u1nr~~ar}, of <br />suhs~.irl'ace eonditioi~s encotuacred iu soil bori~ags is presented in 1 able 1. <br />The hand auger equipment was dccont~minated hetwcc~i~ each boring ii1 a solution of Alcoi~o~: <br />ai7d water, rinsed with tap r~~atei ,and then, ri~ised a second time with, deionized dater. Soil <br />samples for analytica) testinc were sealed wiQ~ paraffin sheets tang plastic ent3 caps at~d sto~-~d lit <br />a cooled ice chest for delivery uildcr ch<<in-o';-custody procedures to astate-certified laboratory, <br />Soil sa~nplc5 for geotecbnical tcstin~~ were sealedwiih plastic end caps and delivered to our <br />ofFicE~ fc~r re-e~:aminatiion acid gcoteclulic~~l laboratory tusiing selection. <br />Thre:c brlllc sam}~!es, desici~ated S-1 th,-ou~rh S-3, were obtai~~ed wilhil~ the upper foot for <br />geotechz~ical laboratory testing (compaction atld remolded pern~eability), The bulk san~alc <br />locations ~u~c shown nn Fitr.l'.re ?. <br />