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HomeMy WebLinkAboutGREENSTONE PUD PHASE 1 - Filed GC-GENERAL CORRESPONDENCE - 2004-08-09Empire Laboratories, Inc. A Division of The Terracon Companies, Inc. PO. Box 503 • 301 No. Howes Fort Collins, Colorado 80522 (303) 484 0359 FAX No (303) 484-0454 March 8, 1993 Parsons and Associates 432 South Link Lane Fort Collins, CO 80524 ATTN: Mr. Gary Odehnal RE: Greenstone P.U.D. Phase I (Roadway Section Modifications) Larimer County, Colorado Job No. 20935006 Mr. Odehnal: Our subsurface exploration report concerning this project was submitted to your attention on January 25, 1993. In that report, we provided recommendations for pavement sections on the Phase I local streets, Greenstone Trail and County Road 32. Those recommendations were based on a Hveem stabilometer R-value of 2.5 as determined on remolded samples of near surface cohesive materials from the site. Subsequent to completing that report, we have been asked to evaluate an alternative pavement section for those roadways. As a part of our Greenstone P.U.D. Phase II exploration, a Hveem stabilometer R-value test was completed on a representative sample of remolded sandstone. The sandstone materials were encountered in both the Phase I and Phase II areas at relatively shallow depths. As we have discussed, the sandstone could be used as a "subbase" for the site roadways and thus reduced pavement sections could be considered. In the County :Road 32 area, we recommend at least 18 inches of lean clay subgrade be removed and replaced with the compacted sandstone to develop the roadway subbase. In the local streets and Greenstone Trail areas, we suggest that 12-inches of this material could be used to develop an adequate subbase. The sandstone material is poorly cemented and we would expect the material could be excavated and placed with conventional heavy duty construction Offices of The Tarragon Companies, Inc. Geolechnical, Environmental and Materials Engineers Arizona. Tucson ■ Colorado. Colorado Springs, Denver, FL Collins. Greeley, Longmont ■ Idaho- Boise Illinois. Bloomingtvn, Chicago, Rock Island ■ Iowa. Cedar Falls, Cedar Rapids, Davenport, Des Moines, Storm Lake Kansas. Lenexa, Topeka Wichita ■ Minnesota St Paul ■ Missouri Kansas City ■ Nebraska. Lincoln, Omaha Oklahoma Oklahoma City. Tulsa ■ Texas.- Dallas ■ Utah'. Salt Lake City ■ Wyoming. Cheyenne QUALITY ENGINEERING SINCE 1965 Terracon Job No. 20935006 March 8, 1993 Page 2 equipment. Those materials should be placed in loose lifts not to exceed 9 inches thick, adjusted in moisture content and compacted to at least 95 percent of the material's maximum dry density as determined in accordance with ASTM Specification D-698, the standard Proctor procedure. The moisture content of the sandstone should be adjusted to within the range of ±2% of standard Proctor optimum moisture. On the prepared subbase as outlined above, we recommend minimum pavement sections acceptable to the City of Fort Collins, i.e. 3- inches of hot bituminous pavement overlying 4-inches of aggregate, be used to develop Greenstone Trail and the local streets. Those materials should be placed and compacted as outlined in our January 25 report. Concerning County Road 32, we suggest a pavement section consisting of 4-inches of hot bituminous pavement surfacing underlain by 13-inches of aggregate base (Class 5 or Class 6) could be used to develop the new roadway section. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning this report, or if we can be of further service to you in any other way, please do not hesitate to contact us. Very truly yours, EMPIRE LABORATORIES, INC. A DIVISI OF THE TERRACON COMPANIES, INC. �j Lester L. Litton, P.E. Principal Engineer LLL/dmf 101 PLATTE RIVER POWER AUTHORITY TIMBERLINE & HORSETOOTH ROADS • FORT COLLINS. COLORADO 80525 . (303) 226-4000 January 7,1993 Mr. Gary Odehnal Parsons and Associates 432 Link Lane Plaza Fort Collins, Colorado 80524 Dear Mr. Odehnah This letter is a follow-up confirming our discussions on December 28, 1992 concerning the Greenstone P.U.D. At that meeting, it was agreed that Platte River's 50 foot utility easement would remain in place and joint use with an equestrian path was permitted with the stipulation that no fencing be allowed within the 50 foot easement —only to the edge of the 50 foot easement would fencing be permitted. In addition, 25 feet on either side of the 50 foot easement would be platted to be shown as a 25 foot utility easement —thus bringing the total width of utility easements to 100 feet. Lot lines could then be platted to the center of the existing Platte River 50 foot easement. Also, language would be placed on the plat that would allow the trimming of trees within the utility easement area in the event trees posed a danger to the electrical transmission line. I have enclosed a plot of the magnetic fields for the transmission line that runs through the Greenstone P.U.D. area. This is a generic -type plot and shows the value of the magnetic fields based upon 1„185 amps which is a worse case scenario and the plot of 450 amps which represents a typical day -in and day -out scenario. In addition, the plot shows values at the structure where the conductor is higher off the ground and also out near mid -span or approximately 26 feet off the ground where the conductor is closest to the ground. This plot should give a general feeling of how the magnetic fields drop off as you move away from a transmission line. If you have any questions on any of this material, please do not hesitate to contact me. Sincerely, PLATTE RIVER POWER AUTHORITY Thomas W. McCormick, P.E. System Design Supervisor Enclosures U7 w J H tL O Q IL u J W H LL U N F- w z CJ a F- J � � U F- N U w m J O N 3 O VJ ccY Q N J� F- U) Q w o m O f N O m '- O f N ssnysI- uw 'AIISN31NI =1-4 OIt3NSVW I $ U w U z . z a Q m n Q _Q N a W w 1 J U w U Oi Li' wQz❑ Q D O UJ O F- O 2 z U 7 CD JQ Q I.-- (O w F- Ul (0 N F- m a� z J Q z Q o U aUQ(- UH(LU) i Ha.U)❑ O a } ❑ H } M E LL F- z 4 w QQaa U z cn U7 unaunn. axam m m< H a Lo LO ❑ om0m o to•+m" n V4 1 O 0 11 TRANSPORTATION PLANNING Leigh, & TRAFFIC ENGINEERING CONSULTANTS Scott & I$$9 York Street Denver, Colorado 80206 dealp y, inc. (303) 333-1105 Fax: (303) 333-1107 February 3, 1993 �f Y, Mr. Mike Herzig f 1 City of Fort Collins ` "y P.O. Box 580 / Ft. Collins, CO 80522 & Re: Greenstone PUD, Ft. Collins, CO (LSC #920930) Dear Mike: This letter will provide a follow up to our telephone conversation on Tuesday, February 2, 1993, regarding the street standards for the cul-de-sac streets of the Greenstone PUD. This letter will provide additional information beyond that provided in my letter of January 7, 1993 to Mr. Eric Bracke, Transportation Planner with the Ft. Collins Department of Transportation. You asked that I provide additional information regarding justification for 28-foot wide cul-de- sac streets in Greenstone PUD. Please consider the following: • There are eight cul-de-sac streets proposed for the residential portion of the Greenstone PUD. These streets serve an average of six residential lots with five of the streets serving five or fewer lots, and one each serving six, seven and ten lots. The 10-lot cul-de-sac is the longest one, apprwEi ately 800 feet in length. The average length of the remaining cul- de-sacs is about 200 to 250 feet. • The lots served by the cul-de-sac streets are large, ranging from slightly less than one-half acre to two acres or more. • With large lots and short street lengths, the occurrence of on -street parking is expected to be rare. The typical home will have a three -car parking garage and a large, off-street driveway area in front of the garage. • The cul-de-sacs of Greenstone PUD will carry less than one -hundred vehicle -trips per day. • The 28-foot paved width of streets is considered to be very adequate to carry the low volumes of traffic, given the general absence of on -street parking and low travel speed. In addition, the 28-foot street is a commonly accepted street width. For example, the American Association Mr. Mike Herzig Page 2 February 3, 1993 of State Highway and Transportation officials, in its 1990 publication: "A Policy on Geometric Design of Highways and Streets", states, on page 436, "In many residential areas, a 26-foot wide street is typical. This curb -face to curb -face width provides for a 12-foot center travel lane and two 7-foot parking lanes. Opposing conflicting traffic will yield and pause on the parking lane area until there is sufficient width to pass.". The Institute of Transportation Engineers has consistently found 26- and 28-foot wide streets to be acceptable in low density single family residential areas. In conclusion, we believe that the proposed 28-foot paved width of t he Greenstone PUD cul-de- sac streets is adequate for all traffic requirements, and we urge the approval of this proposed cross-section. Sincerely yours, LEIGH, SCOTT & C:LEARY, INC. > , By:_1- Robert E. Leigh, P.E. Colorado Professional Engineer License No. 4654 REL/wd CC: Ed Hyatt OF FT_ COLI_IINS 1013 EAST HARMONY ROAD PO BOX 270770 F7 COLLINS. COLORADO 80527 (303) 223-4000 May 4, 1994 City of Fort Collins 300 LaPorte Avenue Fort Collins, Colorado 80521 RE: Letter of Credit No. 803-5237 Greenstone, Inc. dated July 9, 1993 To Whom It May Concern: This letter shall serve as notJce to the City of Fort Collins that the above -referenced Letter of Credit in the amount of $24,870.00 shall not be automatically renewed on July 9, 1994 and shall be renewable at the sole discretion of FirstBank of Northern Colorado. If there is need for an extension of the said Letter of Credit for the assurance of the completion of erosion control for Phases I & II of the Greenstone PUD project, please contact me at the above address. Should you have any questions, please do not hesitate to contact me at 223-4000. Sincerely, i� Patrick M. Brady Vice President PMB/pkk crf cc: Jay Stoner, Greenstone, Inc. Comm. .dty Planning and Environmenta, ervices Engineering Department City of Fort Collins May 11, 1994 1st Bank of Fort Collins Patrick M. Brady P.O. Box 270770 Fort Collins, Co. 80527 Re: Letter of Credit No. 803-5237 Dear Mr. Brady: We are in receipt of your letter dated May 4, 1994 concerning Letter of Credit number 803-5237 issued as the Greenstone P.U.D. phases I & II: erosion security, stating that the Letter of Credit will not be renewed. Please be informed that this Letter of Credit is required to stay in effect or some other form of security is established. The development currently has obligations for erosion control, some of which have not been met and or are required for a two year period after the improvements have been installed and accepted by the City. However, the original amount of $24,870.00 may be reduced based upon the assumption that some of the requirements have been met. If the bank would like to reduce the secured amount, please submit such request in writing. The City will then determine what erosion measures remain to be completed. The developer will provide an updated cost estimate for the remaining improvements to the Storm Water Utility for approval. This new approved sum then becomes the amount for a new Letter of Credit in a lesser amount. If you need additional information please call at 221-6314. Sincerely, incerely , J- �' David Stringer Chief Construction Inspector cc: Jay Stoner, Greenstone Inc. Paul Eckman, Deputy City Attorney 281 :North College Avenue • P.O. Roy 580 • Port Collins, CO 80522-0580 • (303) 221-660?