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aeporc <br /> � Cconin Castam Homes <br /> lanuary 30, 1991 <br /> Pa;e 3 <br /> imm 3 tez:eo in escess oi I'_ ieet in Tzst Pit C, wiiera tha botwm oi:ill w,u no[obsern:d. The tlll <br /> consis�s of silty sand wi�h �ravel, with occasional debris and o,anics. T1ie upper 2 to 3 feee was <br /> iound ro be Ioose, with the undedyin3 till bein3 medium dense to dense. The fiil appzarrA w be <br /> some«�hae Iocally derived, much like the maez:ial observed in �he hillside to che wese. Below �he fill <br /> the explorations encountered a medium dense sand with varying amoun[s ot silt. <br /> Groundwatez was observed szepin; irom ehe upper loose tiil, and in the na[iv�sand obszrved <br /> beicw;ha fill. The mrAium dense fill is iaidy impermeable and perches the upper ground warer irt[he <br /> loos�ti!I. Pockecs wi�4in�he till aiso hold smail amour.ts ot;round water. The ;round water tound <br /> below the till appears ro rzprosene [he ori;inal ;round suri�ce of the former low I��in; area. 1 expecc <br /> ;hat nis ws[er is nea�the same elevation as the standin;wa[tr obseR�ed in the low arza m the south. <br /> CO\CLtiS[O\S :\\'D RCCO\i�IL•\DATIO\S <br /> GL\GR:1L <br /> Tf:� sicz s4euid bz eomp�eibl� �,vi[h [ha plar.ned de.elopmer.[. The p:�:':ious rzpor[ which <br /> COV2f'UI f}12 5[02'� slapt co [he +ves[ ;ound [he siopz to Jt SISbIL 1V1[Il CCS�eC[ [0 d227 SII(I25. SOfI1C <br /> precaudans for e:osion and slou;hin;�rz di:cuss'ad in the repon. Thz ull th�t was pi2ezd�an site does <br /> rot �pnazr [o have baen placed over or�anic suilt that would b_ axpzc[•:cl in low lyin� amat. <br /> Substancial or;anits wta noe ubser�ed in the till. Thutfore, settltr.,zn[ or the tiil Gue to de;:aiacion <br /> of or;a;ic :�_c[a: shouid b- insi,ni:ican, b.saJ oa n}� obsen•a[ions. Bai!di^;s �:� shown sz: back <br /> !rom:nv a�ttland �reas that mi�ht c�use foundation di''Scultizs. <br /> Bcildin; icenCaeions �.vill rzquire tot and structura depzr.dznt:valuations due to the till. Th:nII � <br /> dozs not zppeared ro have oeen placed in a manaer ehat �vould me:t eommonly azceptui en;ineerin; I <br /> srndards used ior four.Cacion support. How�ever, ie «'as obsen�z3 ro be mzdium dense co dz�s: in <br /> most arzu below about 3 izec :rd may maee ccmnac[ion stand_rds Por roadway cons[mccion, alNou;h <br /> [his wzs aoc[zs[ed. lt also appzars that tha sita may hace b:en prop:riy s[rip�:d Prior m tilliag, as � <br /> thick ve;etative layar and topsoi!that would be expacted in tow areas wu not tound. <br /> I undentand thu die Ciry of Everect may mquira th2[ all ;i11 undzr roadway ati;nmcnts be <br /> �omnxc[:d !o minim��m an;inaerin; scandards. Sinca �he till appes:s medium dense befow about 3 <br /> fzet, I recommend[hat durin; conseruc;ion of the madway tha[ tha tilt be tested and art:�c no[mzztin; <br /> COUVRETCE GEOTGC2L\ICAL LYCLYGERI�G <br /> ..-+:.��ac.msn-sa��Rfa.�i.. <br />