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October 24, 1995 �� <br /> TRIAD ASSOCIATES <br /> Mr. Gordon Witcher <br /> City ofEverett Public Works P�°��°""a^a�°m�-' <br /> - 3200 Cedar Street c'°''E"9'^�°^^� <br /> Everett, WA 98201 �a^°s°���y�^9 <br /> '4�;��: ' � � Lantl Usc Planmr_ <br /> - RE: Intrawrp -Merrill Creek&Hardeson Road Sites LantlScapc Archtlec'_�C <br /> Triad Job Number 95-225 ` s���0��,9� n�o�,I <br /> ��1 <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 Ges within the inactive quarry below Intrawrp's proposed <br /> - "Seaway" project. Site #2, "Hardesen Road", is located on the east side of Hardeson Road, <br /> across the street&om the proposed "Merrill Creek" site. Both projects are in the planning stage <br /> � and are ready for preliminary engineering analysis. It is assumed cietention and/or water quality <br /> -' facilities will be required for both sites. We understand detendon (some or all) may already be <br /> , provided within the ciry's regional detention system just north of the Merrill Creek site. It is <br /> important 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. If additional <br /> J 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 /> sun+ey 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 uctivity is indicated on these maps, 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 Underbrush, CN = 7G (Alderwood Gravelly Sandy Loam <br /> and Tokul Gravelly Loam, Soils Group C) <br /> Time of Concentration: <br /> 300' of 32.00% Sheet Flow through forested underbrush, n=0.60 and Tc =34.4G Min <br /> 1,600' of 1.70% Channel Plow through forested ravine, Kc= 10.0 and Tc = 20.45 Min <br /> Total Tc = 54.91 Min <br /> .�,. . 'I'iP� ;... �i��I11 v��� .y�.l '.i,�.� , ' 'Ib�i i t L'i �. Phonc llll,lf." ..Lllt Toll FrCe �➢ID 4H1�.fV'� Fa� 'I.� .�,. <br />