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Transcript of ... Bentley WaterCAD V8i (SELECTseries 1) [08.11.01.32] Bentley Systems, Inc. Haestad Methods...

  • FINAL UTILITY REPORT

    FOR

    QWEST THORNTON CENTRAL STORAGE

    12251 WASHINGTON STREET

    THORNTON, COLORADO

    Prepared by:

    Bowman Consulting

    603 Park Point Dr. Suite 100

    Golden, CO 80401

    (303)-801-2900

    Contact: Charles Weiss, PE

    June 29, 2015

    Revised August 14, 2015

    Revised September 30, 2015

    Revised November 13, 2015

    Prepared for:

    Resolute Investments

    7374 South Alton Way, Suite 203

    Centennial, CO 80112

    (303)-572-4371

    Contact: Kristopher Barnes

  • CERTIFICATE SHEET

    Resolute Investments hereby certifies that the sewer and water system for the Qwest Thornton Central Storage will be constructed according to the design presented in this report. I understand that the City of Thornton does not and shall not assume liability for the sewer and water system designed and/or certified by my engineer. I understand that the City of Thornton reviews utility plans but cannot, on behalf of Qwest Thornton Central Storage, guarantee that final utility design review will be absolve Resolute Investments and/or their successors and/or assigns of future liability for improper design. I further understand that approval of the Plat and/or Development Permit does not imply approval of my engineer’s utility design.

    ATTEST: ____________________________________

    Kristopher Barnes

    _______________________________ ____________________________________

    Notary Public Authorized Signature

    I hereby certify that this report (plan) for the Final Utility Design of Qwest Thornton Central Storage was prepared by me (or under my direct supervision) in accordance with the provisions of the City of Thornton Standards and Specifications for the Design and Construction of Public and Private Improvements for the Responsible Parties thereof. I understand that the City of Thornton does not and shall not assume liability for utilities designed by others.

    ____________________________________

    Charles Edward Weiss

    Registered Professional Engineer

    State of Colorado No. 28850

  • GENERAL LOCATION AND DESCRIPTION

    The Qwest Thonton Central Storage site is located in the Southeast Quarter of Section 34, Township 1 South, Range 68 West of the 6th Principal Meridian and encompasses approximately a 5.2 acre portion of Lot 2A, Block 1, Qwest Thornton Central Office Subdivision on the west side of North Washington Street.

    The site’s surrounding area is made up of commercial and industrial properties. There is a 40 foot right-of-way adjacent to the north property line that contains drainage pipes and will be replatted as an exclusive water & drainage easement. An existing STOR-N-LOCK facility is located directly north of the right-of-way. The west side of the site is bounded by a day care facility and Newcomb Spring of Colorado manufacturing facility which front Pennsylvania Street. Qwest has a commercial building south of the site with a parking lot and detention pond adjacent to the property.

    The northeast corner of the site contains a gas regulator station that is in a 30 foot by 50 foot easement. Just west of the gas regulator station is a 42 inch storm drain daylights into a grass lined channel in a 40 foot drainage easement that runs southeast from the north property line to an existing 6 x 3 RCB that crosses under Washington Street into Brantner Gulch. An existing 24 inch transmission waterline from the Cherokee Tank along I-25, is located in the west side right- of-way of Washington Street from the intersection of Pennsylvania Street to the 40 foot right-of- way near the north property line of the Self-Storage site. Once it enters the 40 foot right-of-way it runs west until it reaches the west property line. From here the line turns south again behind the commercial properties on the east side of Pennsylvania Street. A 12 inch line ties into the 24 inch line at the southwest property corner, and runs along the south property line. Existing sanitary sewer runs along the east side of Washington Street.

    Currently the site is undeveloped and covered with sparse vegetation and native grasses. The proposed improvements for the site include eight self-storage buildings. The main building (Building A) will be on the east side of the site near Washington Street. It is planned to be a two story climate controlled structure with water and sewer services. It will also include an office, manager's residence, and garage. It will have approximately 42,317 square feet with a fire sprinkler system. The other seven buildings will be single story structures for storage only ranging from approximately 6,000 to 9,250 square feet. A detention and water quality facility is proposed just south of the main building. No irrigation facilities are proposed for this site.

    BASINS AND PRESSURE ZONES

    The project area is located in existing water Pressure Zone 3, Sub-Zone 3, receiving its water from the Cherokee Tank’s 24 inch transmission line that runs along I-25 to 128th Avenue.

  • The proposed Self-Storage facility will fall into the approximately 85 acres of commercial development inside Sanitary Basin G. Basin G terminates into Basin H (Big Dry Creek Basin). The site will be served by an 8 inch sanitary line on the east side of Washington Street.

    DESIGN CRITERIA The utility report is prepared in accordance to the City of Thornton “Standards and Specifications for the Design and Construction of Public Improvements”, revised October 2012 and “Volume 1: Water and Wastewater Systems Master Plan” City of Thornton. Basins and Pressure Zones are those described in the manuals above. There were no previous utility reports for this area. The main building of the Self-Storage facility will have a water connection along with a 6 inch fireline connecting to the existing 12 inch waterline in an existing easement on the Qwest property. 4 fire hydrants are required for this site. 2 on the north side of the property will tie into the existing 24 inch transmission line in the 40 foot right-of-way, and 2 on the south connecting to the 12 inch line. The required fire flow for this site was determined to be 2,250 gallons per minute (gpm), which can be split between 2 hydrants, at a minimum residual pressure of 20 pounds per square inch (psi). This was based on the total fire area of the single largest non- sprinkled building (Building B: 9,253 square feet) and Type IIB construction. Although Building A is larger, it is sprinkled so a 50% reduction the fire flow resulted in a lower requirement than the fire flow for Building B. A WaterCAD model was run for the main building maximum daily demand, plus fire sprinkler system demand, plus a hydrant under fire demand. The demand was found by multiplying 150 GPD per person by a low density residential factor of 3.45 for an average 517.5 GPD. This average was multiplied by a peaking factor of 5.76 and a max daily factor of 3.2 per Thornton criteria then converted to GPM for WaterCAD modeling. Fire flow required was provided by Senior Fire Protection Engineer, Bob Sullivan, given the sprinklered building's area, Type II-B construction, and full fire sprinkler coverage, the final fire flow requirement is 2,125 gpm. The results showed that the pressure complied with City of Thornton standards. The WaterCAD results can be found in the appendix.

    City of Thornton sanitary sewer criteria states that q/Q for sanitary systems shall be less than 50%. For this exercise a conservative stance was taken assuming the pipe is at minimum slope and the existing 8 inch sanitary line, that will serve the Self-Storage site, is already 50% full. Given this assumption the impact on the flow is negligible. Using the City of Thornton criteria for commercial sites, the peaking factor was found to be 10,920 GPD converted to 0.017 cfs which translates to a 1.57% increase.

    CONCLUSIONS

    This utility report was prepared in accordance with City of Thornton Standard and Specifications along with Volume 1: Water and Wastewater Systems Master Plan. WaterCAD results and calculations for the determination of sanitary flow increase can be found in the appendix of this report. The calculations were performed in accordance to the City of Thornton Standards.

  • REFERENCES

    “Standards and Specifications for the Design and Construction of Public Improvements”, City of Thornton, 2012 Edition

    “Volume 1: Water and Wastewater Systems Master Plan”, City of Thornton, 2010

  • APPENDIX

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    HERCP

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