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Corn�erstone <br />, Geotechnical, Inc. <br />Augusl 2R, ZOUG <br />M r. Jc f7' Dy c <br />f3onlirrn Iluntcs <br />951d — 4th titrcct N1;, Sui�c 102 <br />Lakc Stc��cns. AV;ishington 9RZSR <br />17625-130'^ Ave. NE, C102, Woodinville, WA 98�72 <br />Phone: 425-844-1977 <br />Fax: 425-844-1987 <br />Itockcrv I{valuation Lcucr <br />I3cintonlc I lcights Rcsidcnlial Ucvclopmcnt <br />livcrclt. 1Vashington <br />CG Filc No. 2098 <br />INTRODUC"1'ION <br />You havc rcyucslcd that wc prcparc Ihi� Icucr lu documcnt uur cvalua�inn and reconuncnJ:uiuns <br />conceming rocAcrics along thc northcrn siJc of your l3cimonlc Ilcights residcntial projcct in <br />li�crcll. Washington. Wc havc hecn ohscroing thc carthwork phasc of constr��ction at Ihc projccl <br />on a parl-�imc hasis sincc Junc 200G. <br />I'rojcct plans JatcJ March R. 200G, hq Corc Ucsign, incluJc a Jctail lix lill rockcrics. 'fhis Jctail <br />sho��s �iwnd:uiuns liir residcnccs ccicnding bclow a linc �I�nt hcgins at tlic hacl: of ihc basc of thc <br />rncl�cq, and coidinucs up�rard wi�h an inclinnlion of 2 I IurizoNnl lo I Vcrtical (211:1 V). <br />1'uur rocken contractur has construcicd a ruckcry �cilh a hcight of a�proxima�cly R fect along ihc <br />rasirrn sidc uf �hc pnject. 'I'hc ruckcq faccs �ill pl�ced and compactcd prior �o our invoh-cment <br />�cith thc projcc�. Wc h�nc bccn providcd ��ith licld repnrts prcpared by'I'crra Associatcs and <br />II\VA Gcosciciiccs Ihat dncument thc lill as �;encrally ntccling thc minimum compaction <br />spccilicatiun nf95 percenl uf �!ic s�andard Proctor(AS"I'M UG9R) maximum dn density. New till <br />h�u hcen rcccntly placcd hchind thc ruckcn �cilh a backslopc of appro�imatcly '_I1:I V. Wc havc <br />c�:duatcd �hc lill ��i�hin �hc slupc scc�ion abmc Ihc rockcry, and our in-pl�ce dcnsity Icst results <br />indica�c that thc rcccnl till mccls �hc spccdication of a� Ir.�sl 95 perccnt of thc modificd Proctor <br />(AS7'�1 DI$57) masimutn Jn' densily. Ruck spalls (2 lo l mrh ,iicJl I��r :i ,rc�inn mra.urin� <br />abnut 3 �icl ��idc ��rn placcd Jircctlp hchind thc rockcry ro.l., <br />