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, � <br /> Glemvood Terracc <br /> Pile Number IZG999 • <br /> h1ay l2, t994 <br /> Pagc 4 <br /> Sevcnl wcll-like pipes wcrc observed at the tce of the steep slope (quarry cxcavation slopc). Thc adjaccnt <br /> property owuer infonned us that thc wells N•cre in.stalled several years ago to drain surface w:�tcr, but waz <br /> not sure if thcy an; cutafF trenches or some t}pc of decp infiltration systcm. 71ie pipcs consist of 4 inch <br /> perforatcd pipes e:<tcnding vertically into the ground. Water levels in lhe pipes appeared to be a fcw fcet <br /> below the grawid surfncc. We do not know and liave not invcstigatcd the puryose of the pipes; :u�d at this <br /> timc, cannot wmiricnt if tliey ure properly working. 71iey may I�ave been part of a well system Ihat allowed <br /> decper cxcavation into U�e previous quarty. <br /> 77�e westcm portion of the sitc is a hillside diat shows signs of soil movement. Improvements have not <br /> bccn plam�ed in this arca. 'Ru hillside r.uiges from l8 to 30 degrees (33 to 55 percent). The crcek diat <br /> runs Gom nortl�to soud�exists al die toe of U�e slope. 'ilie total vcrtical relief across Uiis portion of thc sitc <br /> is on U�e order of about 100 fcct. The upper slopes in diis arca are diickly �ti•oafed wiU� oldcr Alders and <br /> Hcmlocks. <br /> Detention Pond Area: 71ie nortlieast portion of dic sitc slopcs £rom Glcm��ood Avenue dow�i to�vard the <br /> west at approximately IS degrees (27%), reduces l0 5 degrees (9%) through most of the pond area, and <br /> U�en incrc:ues to 10 to IS degrces(l8 to 27%)toward die creek. Tlic toeal vertical reliefacross diis portion <br /> of dic sitc is on the ordcr of 25 feet. 'ihis area is lhickly weodccl���t}� 10 to 20 ycar old Alders. <br /> Rubble Fill Area: 11ic south cdgc of lhc sile is bordercd by a fill slopc. 'Il�e surface of the fil) exposcs <br /> somc rubble, indicating that nibble exists within the fill. 'I1ic slope has an incline up to thc south of <br /> approximalely 20 dcgrees. Most, if not all, of Uie slope cxtends off sile to thc souU�. 71�e total vcrtical <br /> relief of thc rubblc slope is npptoximntcly 20 feet. 7he nrca adjaccnt to the£11 in the Icvcicr portions oC U�e <br /> sitc arc Uiickly���ooded�eitl� !0 to 20 ycar old Aldcrs. <br /> SU63UI'�AC! <br /> GeoloeY: Tlic geologic map tiUed Everett Ouadrnnpla Snohomish County,Washington, by Iunes Minard <br /> (U.S,G.S., 1985) was rcfcrencccf for the geologic :v�d soil conditions at Q�c site. 'Ihe soil units mappcd at <br /> Oiis site arc cl;tssified as glnciel till (Qvt), advwicc oubvash (Qva) :u�d Ir�uitionnl beds (Qtb). Glacial till <br /> is an unsortcc!densc to vcry dcnse mixturc of s1nd, silt, and gravel Uiat is depositcd from U�e bottom of die <br /> glacier. Conunaily, till is reCcrred to as "hardpan". 11u ounvash usually consists of a dense, clean, <br /> unifomi finc to medium sand. 71ic transitiona) bcds are usually intcrbeddcd la}•crs of dense to vcry dense <br /> sandy silts,silty s:uids,cican sands,and gravels. <br /> Most of thc Puget Sound Region �ris alTected by past intrusion of conlincntal glacialion. Tl�e I�st perial <br /> of glaciation, die Vaslion Stade, endcd npproximatcly ]O,D00 yelrs ago. M:tny of thc geogrnphic feaRires <br /> NELSON-COUVRE7TE& ASSOCfATES, WC. <br /> F[D-23-19a6 12:02 206 481 2510 97i P.�6 <br />