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Home My WebLink AboutSite Certifications - 09/04/200201/23/2004 lltU FAX 9704959736 LOONAN ASSOC INC IM002/002 f A 0, St 270M 964 6aws MAW (970) 493-9W STORMWATER RECEIVED 2 3 2004 September 4,2002 City of Folt Collins Stormwater Utility 700 wood Street Fort Collins, CO 80526 117_0CLN fri LL awo_ RE: Re -Certification for Big Horn Village IL located directly east of City Park Avenue and a few hundred fed south of University Avenue. Dear Sirs: On September 4, 2002, we observed the site located at Big Norn Village 11. We observed the site during a warm partly sunny day. Our observatiom were limited to those items that was not properly installed at out August 16,2002 site visit: Please refer to ourAugust 16,2002 certification letter. The following underlined items were deficient at our August 16dobservation. Detention.Pond A: The Water Quafity Plate wasmo6natalled vtoperly. — We observed the orifice platetoday and it appeared to be installed as designed. Also, a trash rack has been added, Detention Pond B- e The Orifice the �pipe _illlireyy nsstrictina the --flow even more. Today we obs.oved that the orifice opening has been- cleaned out and the orificeplatewas adjusted. However, the bottom of the orifice opening is still slightly below the invert of the -outlet pipe. With the cleaner opening, we believe Oat the orifice opening will operate in at acceptable n=nerand, will not be detrimental to the downstrem properties. Our recommendations were based on out observation on the date noted above. If you have any questions, Please contact me at: the above. aftess or phone number. Sincerely, N\ I JJ%J ki I I I i fit, 0)"v Ri I 4w,w dad A&ceaa4,.,,A44 James R. L Onan, P.E. % AL Azu�_-Idl UL ?bib 4 1630 S. ed&9e Aepme . 0. Sax .07095P (970) 493-2808 3, Z (970) 495- 9735 August 16, 2002 City of Fort. Collins Stormwater Utility 700 Wood Street Fort Collins, CO 80526 RE: Drainage Certification for Big Horn. Village II, located directly east of City Park Avenue and a few hundred feet south of University Avenue. Dear Sirs: On August 16, 2002, we observed the site located at Big Horn Village IL We observed the site during a warm sunny day. The site had been final graded. In addition to our observation, RJL Surveying obtained spot elevations at numerous spots throughout the site. Please refer to the attached elevation_ sheet. Based on our observation and the attached surveyed information, the site appeared to drain away from each.of the buildings as.follows: Building 1-5: The area drained away from the buildings, typically as designed with a few changes. • The swales located east of the building (between Buildings 1 and 2) was not as deep as designed, however; we believe that it will still function.. Detention Pond A: • The Water Quality Plate were not installed properly. The grading of the pond appeared to generally conform with the grading plan. The emergency overflow has, been constructed. Please refer to the attached calculations and drawings. • The calculated detention volume are greater than the required amount. Detention Pond B: • The Orifice Plate were not installed properly — the opening in the plate is below the invert of the pipe thereby restricting the flow even more.. The grading of the pond appeared to generally conform with.the grading plan. Please refer to the attached calculations and drawings. • The calculated detention volume are greater than the required amount. Our recommendations were based on our observation on the date noted above. If you have any questions, please contact me at the above address or phone number. \\\\\ 0ylll I l Sincerely ` �PO0, RED/s 000 �GHAW3% �F I�VM�iYNY MW / '�/ I rylil �O p ` O / ZZ James R. Loonan, P.E. BIGHORN VILLAGE II Detention Pond.V_oltmes -.POND B Delta Volume=(D/3)(Al+A2+SQRT(AIA2)) FT FT . 228 - 0 0_ 0 23 55.24 4 4 24 71.9.01 325 328 25. 1702.42 L, 06 1,504 R �? �D Vv c . Z Al 5 r7 BIGPOND4.txt BIGHORN VILLAGE 2 DETENTION POND AS BUILT VOLUME 14 AUGUST 2002 GSF CONTOUR AREA.(SQ FT) VOLUME(AVG) VOLUME(CONIC) 27.5000 16960.8801 39950.15365 39125.4595 27.0000 157852026 31764.0159 30940.6982 26..0000 13326.8754 17207.9769 16401.9893 25.0000 964.4.2568 5722.4108 4965.9417 24.0000 1196.9589 301.8029 219.6652 23.5000 .10.2527 0.0000 0.0000 r�S. = Z �• y3 i 11F bldg. edge 0" EXISTING f PARKING L "URE v X 3q, �S LO LINE 3' "TYP 6" cub (tYP) ` FF45 38.65 �. 4 c nc. waI o cC 38.80 J. 36 O d r •• I -- 35 37.37 .78 E 37.37 36.5$. 36 ( + _ CL I� bldq clsp o (ty MISHED SHA RED �T TO R£M -✓ N M 1r? 28 i m a UM , I, a a w b/dg 4CONC. WALK TYP INTER/ORS ' C �- i 12, Y � I bl \ I �J C. TRAS, FF=5 36. 0 FF_@ DC 4.68 6» S I FF= 5035.10 I 1 � � + ACCES �D AS, U I I ^ry N � FF=5c EMTGE Y� CESSokASEM NT � M \ 3 /-� % % .� [777/7/--�7 bldg./ E 1� 9PAK/G r1' 9•, "F= %IJ C-IYi 1 IT / '41 1 18 T7A L 1 PA K! AC 6s N �g� b aq / P—/ 7-�T f/ b/dq. / n Vp 9. I g Q FF= 5029.70 s� 0,Q �a •FF— C ORS$ F z8e OOR 29-U 9.00'�@Dio ry 8.80 ti 0 _30 a e S T % T/71�) i-/7-/- Al� bldg. n j 7-/ 7-/� � . ..- bld 9 / / ,� _ .- i b/dg. conc. pad / lec. transforrpe/ I bldg. 11&-Z11zzz-z I 1 s l \ 5 p25 1 ~ p0O-'CON, ,�, e. ge of asp alt :ND OF `Sp2 RETPROAINING WALL BETE +"� 'ROPOSED `� I ;ETAINING �SE.F- DESIGN BY, JALL TERRACON/DETAIL ON END OF PROPOSED SHEET 15) ,_ °� RETAINING WALL =5029.70 F-7-- q0t P W \� U S DTI r 10 bldg. Aso v o f CO \ . 1.7 ° - 1 15' 6» curb t ,. gravel drive i \ 3' 'UTILITY EEMENT RNCEPTION # 94055498 housea w.. � � II ry 25 . conc. / patio conc. walk. ,0 JO� 1 i / 2 _ �, � a:. \ \ > r I \ � f i� 9' ADDITIO AL R/W RECEP ON # 9 55497 _ 1 September 4, 2002. City of Fort Collins Stormwater Utility 700 Wood Street Fort Collins, CO 80526 1630 S. ed&9e si cow 5-76e ems, e0 80527 (970) 493-2808 57(970) 495- 9735 RE: Re=Certification for Big Horn Village II, located directly east of City Park Avenue and a few hundred feet south of University Avenue. Dear Sirs: On September 4, 2002, we observed the site located at Big Horn Village H. We observed the site during a warm partly sunny day. Our observations were limited to those items that was: not properly installed at our August 16, 2002 site visit. Please refer to our August 16, 2002 certification letter. The following underlined items were deficient at our August 16t', observation. Detention Pond k • The Water Quality Plate was not installed properly: — We observed the orifice plate today and it appeared to be installed as designed: Also, a trash rack has been added. Detention Pond B: • The Orifice Plate was not installed -properly — the opening in the plate -was below the invert of the pipe thereby restricting the flow even more. — Today we observed that the orifice opening has been cleaned out and. the orifice plate was adjusted. However, the bottom of the orifice opening is still slightly below the invert of the outlet pipe. With the cleaner opening, we believe -that the orifice opening will operate in an acceptable manner and will not be - detrimental to the downstream properties, Our recommendations were based on our observation on the date noted above. If you have, any questions, please contact. me at the above address or phone number. Sincerely, \l��a��u i i i iui, zadwrao� aqd r�MM&a. �Q0 RE' James R. Loonan, P�ssj �i,,��4NA L'EN 1630 S e'P1w'4"Nue P. 0..Vn 270952 56t eO 90527 (970) 493-2908 30 (970) 495- 9735 September 4, 2002 City of Fort Collins Stormwater Utility 700 Wood. Street Fort. Collins, CO 80526 RE: Re -Certification for Big Hom Village` II, located directly east of City Park Avenue and a few hundred feet south of University Avenue. Dear Sirs: On September 4, 2002, we observed the site located at Big Horn Village IL We observed the site during a warm partly sunny day. Our observations were limited to those items that was not properly installed at our August 1.6, 2002 site visit. Please refer to our August 16, 2002 certification letter. The following underlined items were deficient at our August I e observation. Detention Pond A: • The Water Quality Plate was not installed properly. — We observed the orifice plate today and it appeared to be installed as designed. Also, a trash rack has been added. Detention Pond B: • The Orifice Plate was not installed nronerly — the pipe merely resmcung ine now even more. — i oaay we opservea max ine ounce opening has been cleaned out and the orifice plate was adjusted. However, the bottom of the orifice opening is still slightly below the invert of the outlet pipe.. With the cleaner opening, we believe that the orifice opening will operate in an acceptable manner and will not be detrimental to the downstream properties. Our recommendations were based on our observation on the date noted above. If you have any questions, please contact me at the above address or phone number. Sincerely, .L�ocoian aacd s�aeaetated, James R. Loonan, P.E. e," 0NAL