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RPR 17 '89 15:03 CUMIIIMGS ASSOC 899 P�5 <br /> , . . � <br /> Exietinq Conditione: " <br /> The site for the proposed Horizon Elementary School io approxim�t�ly 19 aerea <br /> in siz�. boeated on tre site is s larqe swamp area, along with which the <br /> requlred buffer erta encompasses approxieat�ly 6.C7 �cree. Thie Eringe the , <br /> buildabU erea of the site down to approximetely 12.53 �cr�s. Thc eit• is � <br /> qenerally covered eith low qround cover and younq gtowth d�cidoue tree�. I <br /> The sit�� �trom det�ntion �toraqe volume and releaee rate w�� ealculeteA by the � <br /> City of Everett. Tht atoraQe volupe ceiculated by the City ot Eaerett ie i <br /> J3,271 C!' xith a c�lculst�d releese rate ot 1.19 CiS. Due to site'e qt�de <br /> r�ttr�ints, apptoxiutely 0.24 �cree of secees rosd will by pase tAe �torn <br /> detention eytt�n. tAe storaqe volume requireA by thia area Mill D� proviEed !or <br /> �nd tAe relesse rate ot the d�tention system Mill bs down ■ized ■eCorAinply. <br /> C�lcul�tione: <br /> Given: <br /> Storaqe Volume � 33,271 CF C.O.L. <br /> Rels�ae Rete ■ 1.19 CTS C.0.8. <br /> Storap• Volu�ne Provided: <br /> 1,1"5 LF of 83" + 57 AXCh CMP, Equiv. RounQ � 72" <br /> Volune ■ 31,808 CF <br /> 72 Li ot 36" CMP <br /> Voluee ■ 155.5 CT ' <br /> 16,55 LF of 72" Menhole� ' � <br /> volum• = a68.00 cF s �K : � ' <br /> � 1�0 LF 26" Conc. <br /> Yolume - 4d0 CF <br /> 167 LT 18" Cone. <br /> Volume ■ 295 CF <br /> 1213 Lf of 48" CitcA 9aeina <br /> Volu�t = 151.0 CF <br /> Total Volume ProvideA 33,318 tF <br /> Re�caae Rate: <br /> Given: <br /> Alloreble Relee�e Rat? � Q� � 1.19 CFS C.O.t. <br /> I <br />