1202 SHUKSAN WAY 2018-01-01 MF Import

r � rULrn 2 boundary near thc northcm pro�xrty linc. Thc souih ditch originatcs on Lot 3 and cnlcn thc site near the tniddle of the castcm property boundary. A third smallcr ditch is locatcd alon� thc � west side of Lot I and flows south to thc pond. Standine wa�er �+�as obscrvcd in tlic �nd and within the lower cnds of thc hvo wcstem drainage ditclrcs. A I'_-inch-diamc�cr corrugaled drainpipe is located north of lhe slortnwater pond and discharges ��uter to the ��est and aff thc tiilc. � No appreciable ponded wa�er��as obsen�cd in tlic ditch orieinating frotn Lot 3. Tlie ground surfacc a1 the site is generally devaid of�•egctation ��ith rclativcly fc�� wecds and �.. small shrubs scattered across ihe sile. 3.2 SITE GEOLOGY r Prior to mining by CSR Associated, geologic maps for the Mountain Vicw Dusiness Ccntcr � indicated diat thc surficial soils consist of Vashon glacial till. Glacial till qpically consists of a vcry 1 compact, poorly sorted, nonstratificd mi�turc of clay, silt, sand, gravel and cobbles. Unweathered glacial till typically appears gray or blue on a fresh surface, while weathercd glacial till may be bro��n to ycllow in mloc Glacial till is kno��n locally as "hardpan' and ranges from about 10 to � 100 feet diick in the viciniry of CSR Associated's properry�. Based on our knowledge of the sile,we � expec[ tha[ the native glacial till was complelely removed from Lots 1 and 2 during mining � � ac[i��ities to expose the underlying sand and gravcl resources. Glacial advance ouhvash deposits underlie the elecial till at the site and may be?00 to 300 feet thick. Advance ouhvash generally consisting of sand or sand and gra�•el ��•as mapped outcropping � at the surface along the north side of CSR's property. Based on our pre�•ious site work, we found that advance outwash sand and gravel soils �+�ere present on the site prior to filling. The sand and gravel was erposed in the old pit bottom at about Elevations 405 to 41> feet alonF the southern � portion ofthe site. Transitional Bed deposits underlie the advance ouhvash and may be about 150 feet thick at the r site. Transitional bed deposits generally consist of glacially consolidated silt and clay and are � considered an aquitard. We anticipate the upper surface of the Transitional Bed deposits is at about Ele��ation 150 to 200 feet. � Gcologic infomiation was obtained from: • Thomas, B.E., Wilkinson, J.M., and Embrey, S.S. (1997). The Grom�d-Warer St�sicm and 1 Ground-Ii'arer Quality in I3'es�ern Srrohomish Counp; ti'ashingron. U.S. Geological Survey. Water-Resources Investigations Report 96-4312. • Minard,James P.Q 985). Geologic Map of the Eremrt 7.5-Minu�e Quadrangle, Snohomish ' Counq; lYashingron. U.S.Geological Survey. Map MF-1748. • Minard, James P. (1982). Distribulion and Descriptra: oj Geologic Unirs. Mukrlleo ' Quadrangle, {i'ashinglon. U.S.Geological Survcy. Map MF-1438. • Minard, ]ames P. (1981). Dislrrbinion and Description of Geologic Urri(s in the Eremtr Quadrang(e, 1i'ashingron. U.S.Geological Survey. Map OFR-81-248. I � � G e o E n g i n e c r s 4 fileNo. 7584-002-00-I�3010?0101 j�