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Home My WebLink AboutLot Certifications - 11/03/1986 (3)McRAE & SHORT, INC. 1231- 8th Avenue Greeley, Colorado 80631 Telephone 356-3a01 \0 Mr. Tom Gathmann; Civil Public Works Department 300 La Porte Avenue. Fort Collins, Colorado Engineering, Surveying, PI Engineer 80522 RE: BROWN FARM SIXTH FILING STORM DRAINAGE FACILITIES CERTIFICATION Dear Mr. Gathmann ,. ing & Land Development November 3, 1986 PROJECT NO. 85048 In accordance with the Drainage Facility Approval Policy, we:are hereby sub- mitting the "As Built" drawings and certification. As the construction engineer, we have staked, inspected and made volume calcu- lations on the installed detention pond in this subdivision. We find the con- struction to be in close conformance to the design plan and approved revisions. All pond inlets and pipes were installed.according to the plans. .The detention pond volume was calculated from survey information taken in March, 1985; The volume was calculated and found to be short at this time. Analysis were made of the detention volume and adjustments proposedLin. the spillway and berm elevations to achieve'a detention volume of 8.4 acre feet. The attached letter of April 2, 1985 outlines these items. In addition, the attached letter from the Pleasant Valley and Lake Canal Co: acknowledging the detention area and dis- charge conditions at .this location is on.recor.d:zt ah.e Gi.ty',:.:Tbe pond has: been constructed with proper side slopes, overfl:ow::.and .outlet,; and ;tri-ckle .channel. It is 'odr judgment that the storm drainage facilities have been constructed in accordance with the.'approved plan. Yours truly, McRae & Short, Inc. 6616 �e �e s 0 Gerald B. McRae, Professional Engineer and Land Surveyor, Colorado Reg. No. 6616 encl.: "As Built" Mylars.,Sheets .1/24 and 24/24 cc: Wheeler.Management.Group, Ltd:, Dan Wheeler CITY OF FORT COLLINS ENGINEERING SERVICES April 21, 1986 Mr. Dan Wheeler Wheeler Realty P.-O. Box 519 Greeley, CO '80632 Re: Brown Farm '7th :'.Storm Dra'inaw acilit'ies Dear Dan: This is to inform you that the City of Fort Collins' Engineering Department is holding the Building Permit releases on the remaining lots in the Brown Farm 7th Filing, due to the developer failing to complete the storm drainage requirements. This seems to be an on -going problem that was brought to your attention in a letter dated February 15, 1985, but was never completed. The City feels that it has worked with you and given you every opportunity to complete these improvements. We also feel that this matter cannot be satisfied with an escrow or a letter of credit because this was done once before and was found to be ineffective. The items listed in the letter of March 15, 1986 that have not yet been completed and the items that were discussed in our meeting of April 7, 1986 with Rick Mattingly and Tom Bath will need to be completed and accepted by the City before any of the remaining Building Permits will be released. If I can be of any further assistance, please feel free to give me a_call at 221-6605. Sincerely,��%% Craig Farver, Construction Inspector . cc: Tom Gathmann ENGINEERING SERVICES 300 LaPorte Ave. • P.O. Box 580 • Fort Collins, Colorado 80522 9 (303) 221.6605 MEMORANDUM TO: CITY OF FORT COLLINS STORM DRAINAGE DEPARTMENT FROM: PLEASANT VALLEY & LAKE CANAL COMPANY RE: BROWN FARM 7TH FILING STORM DETENTION OUTLET FORT COLLINS,.COLORADO We have reviewed the situation concerning the storm drainage outlet from the detention pond located within Brown Farm Tth Filing to the Pleasant Valley & Lake Canal. We do _understand that this storm detention facility is not constructed with sufficient capacity to detain the complete 1.00 year storm. We hereby acknowledge acceptance of the additional storm runoff which would be created by the 100 year storm into the Pleasant Valley and Lake Canal at this discharge location. Although we are agreeable to accepting this additional storm water..we will not accept any liability for damage to our irrigation system or properties lying below (east) of our facilities at this location which may occur during the 100 year storm.. Sincerely, Signed Pleasant Valley & Lake Canal Co. APR 8 0 1986 Date _- v * Drill seeding is the only acceptable means of planting, and shall provide at least 1/4 inch of cover. Mulch must be placed with a crimper'at the :rate of 4000 .lbs. per acre; either straw or hay is acceptable. * Seed tags showing that minimum specifications are met will be required. 6. The steeper channel slopes which cannot be tilled, graded and seeded with equipment shall be done by hand to the same standards as those mentioned above. 7. The.channel west of Yorkshire needs much work to be brought up to an acceptable level. A property owner, has built his fence to the. center of the drainage easement and has.effectively reduced the channel's capacity by 50%. The:developer will either have to .relocate the fence and re-establish the channel as designed, or will have to make accommodation for the channel elsewhere (i.e. on someone else's property, with their permission). The channel's designed capacity must be.re-established, however. Tilling, preparing, and seeding shall then be done to the same standards mentioned in #4 and #5. i8.`• Reproducible as -built drawings with key elevations and pond and channel capacities will be required from a licensed professional engineer before the City will accept these facilities for'perpetual maintenance. 9. Since the recommended spring planting season has come and gone, it is anticipated that seed germination will not be as successful now due -to higher temperatures and lack of moisture common this time of year. Therefore, the City feels justified in holding onto a portion of.the escrowed money to provide any subsequent reseeding efforts that may be needed. My comments represent the minimum requirements necessary to bring these facilities up to an acceptable City standard. Since the developer was allowed to go far beyond the usual quota of building permits and certificates of occupancy before. having. to complete these improvements, City staff expects nothing short of these minimums. Please feel free to give me a call anytime with your questions or with your wish to meet on -site. Sincerely, Michael H. Mercer Coordinator of Operations and Maintenance . cc: Wheeler Realty c/o Bill Neal Craig Farver Tom Gathman CITY OF FORT COLLINS STORM WATER UTILITY Date: May 29, 1986 .`c. Rick Mattingly \J Shiloh Inc. P.O. Box 8537 Fort Collins, CO 80522. th Re: Brown Farm 6th and,7- Fi1`ings Dear Rick: From my recent inspection of the �detenl;'idnCoR-809W!drainage''gFj`annel7of the referenced subdivision, I have these"comments to offer: 1. The channel does not currently drain into .the pond as it is now graded; water just sits at various locations in the channel from Yorkshire east to the detention pond. The proper grade needs to be re-established so that no channel ponding occurs.and trickle flows drain readily into the pond. 2. The detention pond has one low spot about 10 yards in diameter which . a� holds water (near the outlet pipe). It needs to be graded so that it flows to the trickle pan and does not remain Perpetually saturated. 3. The full width of all drainage easements must be established, and then b'c tilled, prepared and seeded as specified below (sec. #4 & #5).. 4. The soil of the detention pond and channel must be tilled. to a depth of four (4) inches, then graded smooth so that positive drainage occurs And large clods, chunks and stones are removed (a 2-inch diameter.or smaller is acceptable). NOTE: A walk-through by a City representative will be required after the soil is prepped and before any seeding is done, 5. The seeding mixture by weight for this project shall be: 35% Slender Wheatgrass 25% Streambank Wheatgrass, Variety: Sodar 20% Intermediate Wheatgrass 20% Smooth .Brome * Application rate shall be 30 lbs. per acre net (i.e., the actual rate will probably be greater in order to make up for those percentage of seeds which don't germinate). 0 1 %Jnin rvri 1 Crs U i iu i T 300 LaPorte Ave. 0 P.O. Box 580 • Fort Collins, Colorado 80522 0 (303).221.6605 1 71" At vF" g Ulm V 31 IV! 4t a tfl�lNE ZMAP t' aq� 5 %... i' T'. or ...... I Itv E AG S :,.. M.' ST v. GROS: ONFEWCHANNEL' 1"M- 1.;f) ry 'At - VA 4 A A VIEW �4.. K. 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