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<br /> October 24, 1995 � �' '�� . .
<br /> TRIAD ASSOCIATE
<br /> Mr. Gordon Witcher ,,,�,��,,,,,,,,�m�,,, �� t
<br /> Ciry of Everett Public Works �, ,���,,,,���,,,,,, �' � ;�,
<br /> 3200 Cedar Street ,:,,,,, s�,�oY,�� � F�;� ;� �Q
<br /> Everett,WA 98201 �,,,,�,u„o,,,,��,,,�.,, ;� a
<br /> � t�
<br /> Landsc:�Vc Arch�i<�4J:� C\j ,+�C/ �
<br /> RE: Intracorp -Merrill Creek&Hurdeson Road Sites r ;c,, �o
<br /> Sde f�esigiM. �.) '�
<br /> Triad Job Number 95-225 �; � �
<br /> C � 4�
<br /> Dear Gordon;
<br /> Attached for you, Jane Zimmerman and Dan Mathia are copies of preliminary site plans, boundary
<br /> & topographic surveys and site development information for two commercial projects proposed
<br /> by Intracorp. Site #1, "Merrill Creek", is located on the west side of Hardeson Road, south of
<br /> Merrill Creek Parkway. This site lies within the inactive quarry below Intracorp's proposed
<br /> "Seaway" project. Site #2, "Hardeson Road", is located on the east side of Hardeson Road,
<br /> across the street from the proposed "Merrill Creek" site. Both projects are in the planning stage
<br /> and are ready for preliminary engineering analysis. It is assumed detention and/or water quality
<br /> facilities will be required for both sites. We understand detention (some or all) may already be
<br /> provided within the city's regional detention system just north of the Merrill Creek site. It is
<br /> impoRant that we know how much of this detention is available and what we have to do to access
<br /> it. We are providing the following preliminary site development statistics so that Jane and Dan
<br /> can determine the required detention volumes and release rates for both projects. lf additional
<br /> information is required, please call.
<br /> Site#1 -Merrill Creek
<br /> This site consists of several parcels, totaling 29.81 acres. The attached boundary & topographic
<br /> survey indicates significant relief as the result of recent quarry operations. The westem property
<br /> is bounded by the revegetated quarry slope. The central portion of the property is occupied by a
<br /> large sedimentation control facility. Most of the remaining flat site is graded to drain towards this
<br /> facility. It is obvious the quarry activities have altered "pre-developed" conditions. For pre-
<br /> developed conditions, I have provided a 1" = 1000' copy of the quadrangle maps for this area.
<br /> Even though quarry activity is indicated on these maNs, the topographic relief appears to be
<br /> relatively undisturbed. Based upon the quadrangle maps, I have estimated the following pre-
<br /> developed conditions:
<br /> Area: 29.81 Acres
<br /> Ground Cover: Dense Trees and Underbiush, CN = 76 (Aldernood Gravelly Sandy Loam
<br /> and Tokul Gravelly Loam, Soils Group C)
<br /> Time of Concentration:
<br /> 300' of 32.00% Sheet Flow throush forested underbrush, n= 0.60 and Tc= 34.46 Min
<br /> 1,600' of 1.70% Channel Flow through forested ravine, Kc= 10.0 and Tc=20.45 Min
<br /> Total Tc= 54.91 Min
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