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HomeMy WebLinkAboutcoa.lu.sm.1490 Red Butte Dr.1980-1 MEMORANDUM TO: Aspen Planning and Zoning Commission FROM: Sunny Vann, Planning Office RE: Sullivan Stream Margin Review DATE: January 17, 1980 The applicant proposes to build a three -car garage adjoining an existing single family dwelling located on Red Butte Drive (Lot 1, Block 1, Red Butte Subdivision). A portion of the proposed garage is within 100 feet of the Roaring Fork River and is, therefore, subject to stream margin review. The Engineering Department has reviewed the applicant's development plan and has determined that the proposed garage is located outside of the 100 year floodplain. In view of the proximity of the proposed garage to the 100 year floodplain, the Engineering Department has recommended that no fill material be placed so as to affect the character of the flood zone streambed. The Engineering Department further recommends that the cutting of brush and trees in the area be kept to a minimum to prevent possible bank erosion in a flood situation. The Engineering Department recommends approval subject to the above considerations. In reviewing Mr. Sullivan's application, the Planning Office has determined that there are no designated trails which traverse the property. While portions of the proposed building site appear to lie within the Roaring Fork Greenway, impact upon existing ecological systems is expected to be minimal. The Planning Office, therefore, recommends approval subject to the conditions outlined in the Engineering Department's memorandum dated December 31, 1979. wr , MEMORANDUM TO: Sunny Vann, Planning Office FROM: Jay Hammond, Engineering Office Date: December 31, 1979 Re: Sullivan Stream Margin Review Having reviewed the survey plat for the above Stream Margin Review and having made a site inspection the Engineering Department recommends the following: That the Sullivan application be approved subject to the following construction considerations: 1) That no fill material be placed so as to affect the character the flood zone streambed. Since the proposed construction is almost immediately adjacent to the 100 year flood hazard line this means that no filling may be done to permit placement of the footers that would extend even 12 inches from the concrete in the direction of the river. 2) That cutting of brush and trees in the area be kept to a minimum to prevent possible bank erosion in a flood situation. It should be noted that this Stream Margin Review application has posed some new problems with respect to the review criteria. The flood potential in this particular location is extremely broad ", such that Mr. Sullivan's home, although outside the 100 year flood plain is completely within what the Army Corps of Engineers calls the Standard project flood zone. The Standard project zone is that area subject to flooding given optimum conditions (snowmelt, rain- fall, ground saturation, etc.). Confusion is created in the Muni- cipal code in that it restricts construction in the "flood hazard area" but does not designate which one. Conferring with our City Attorney as well as a couple of insurance firms in Denver it would appear that under Colorado law the area of most concern is that within the 100 year flood zone and not the hypothetical Standard Project. I also feel that some note should also be made of the conditions creating the wider flood zone at this location. A notable restric- tion on the streambed is caused by the Slaughterhouse bridge imme- diately downstream of the Sullivan property. Under full flood con- ditions this restriction could be further compounded by tree trunks and debris in the flood waters causing a significant damming effect at the bridge. The owner should be aware of this potential hazard. November 28, 1979 City of Aspen Planning and Zoning Mr. Sunny Vann Planning Department Dear Mr. Vann: On behalf of my client, Mr. P. L. Sullivan, I address your department in request that due process be initiated for a "Stream Margin Review" for our proposed improvements on the single family dwelling which exists on Lot 1, Block 1, Red Butte Subdivision. We have designed, and propose to build a three car garage adjoining the existing house, with the intention of creating a harmonious connection between the two, with respect to the nature of the existing conditions, and the character of the land. The area in which the proposed improvement is due to occur, (see improvement survey) is relatively flat, grass covered ground, and contains no large trees or shrubs. Upon the acquisition of a building permit, we will execute the following construction procedures: 1. Remove existing metal storage sheds. 2. Stake -out building perimeter. 3. Excavate footings. 4. Pour footings and foundation walls. 5. Construct wood superstructure and roof as per construction documents. 6. Pour concrete slab after the building shell is completed, and it becomes a heated space. I trust this information will serve adequate in your review of this proposal, but if further information is necessary do not hesitate to call my office. Corlially,� tc rcZ frtl Engle E. $aez / Designer November 28, 1979 City of Aspen Planning and Zoning Mr. Sunny Vann Planning Department Dear Mr. Vann: On behalf of my client, Mr. P. L. Sullivan, I address your department in request that due process be initiated for a "Stream Margin Review" for our proposed improvements on the single family dwelling which exists on Lot 1, Block 1, Red Butte Subdivision. We have designed, and propose to built a three car garage adjoining the existing house, with the intention of creating a harmonious connection between the two, with respect to thc nature of the existing conditions, and the character of the land. The area in which the proposed improvement is due to occur, (see improvement survey) is relatively flat, grass covered ground, and contains no large trees or shrubs. Upon the acquisition of a building permit, we will execute the following construction procedures: 1. Remove existing metal storage sheds. 2. Stake -out building perimeter. 3. Excavate footings. 4. Pour footings and foundation walls. 5. Construct wood superstructure and roof as per construction documents. 6. Pour concrete slab after the building shell is completed, and it becomes a heated space. I trust this information will serve adequate in your review of this proposal, but if further information is necessary do not hesitate to call my office. Cordially, . .�- Engle E. ez /' Designer