HomeMy WebLinkAboutHARMONY TECH. PARK, HEWLETT-PACKARD - PDP - 12-97D - SUBMITTAL DOCUMENTS - ROUND 1 - OTHER WATER AND OR SANITATION DISTRICTS5. REFERENCES
' 1. "Design and Construction of Sanitary and Storm Sewers." ASCE-Manual and Reports on
Engineering Practice No. 37, 1969.
1
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Harmony Technology Park November 15, 2000
4. CONCLUSION
The proposed sanitary sewer system that will serve HTP, First, Second and future Filings,
will have the capacity to carry estimated sewer flows from the entire development. The
collection system will also have velocities that will provide scouring velocities of 2.0 fps,
a design standard minimum, during the peak flow periods. Connection of Celestica to the
system will assure minimum sewer flows in the early years of development
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Harmony Technology Park November 15, 2000
Sanitary sewer service for HTP will require the extension of a new sanitary sewer main. A
lateral will be extended to the southeast corner of HTP by the developer of the Willow Brook
Subdivision. The civil engineer for that development is TST, Inc. Consulting Engineers.
They are in the process of designing the portion of sanitary sewer that will service Harmony
Technology Park. TST, Inc. has provided JR Engineering with the location and invert
elevations at the intersection of the future Rock Creek Drive and Cambridge Avenue.
2.3 Analysis of the Proposed System
The proposed sanitary sewer collection system will be 8-inch diameter throughout Harmony
Technology Park. The pipe diameters were calculated using the contributions from each of
the proposed buildings as indicated in the previous section.
The sanitary sewer design table in Appendix G summarizes the results of the analysis. This
table is organized to reflect the cumulative effects of how the contributions from each of the
phases will .affect the sewer mains.
The table also includes quantities of water from infiltration being contributed to the
collection system. The infiltration volume was determined by using recommendations from
the ASCE's "Design and Construction of Sanitary and Storm Sewers". The rate of
infiltration used in this analysis is 500gal/day/in of dia/mile of pipe. The rate of
500gal/day/in of dia/mile of pipe was used since a majority of the cities reporting in Table
VIII, page 31 of the reference use it as a maximum allowance. It should be noted that
manufactures of PVC pipe claim that infiltration is cut to a minimum due to the tight gaskets
Iused in the bell and spigot design.
As indicated in the sanitary sewer design table, the cumulative effects are shown for each
point of connection. At each point of connection, the contributing flows are summed and the
iI proposed pipe diameter is indicated. It should be noted that the pipe material to be used is
SDR-35 P.V.0 and a Manning roughness coefficient of 0.013 is assumed. Manufacture's
of the proposed pipe material claim the pipe has a Manning roughness coefficient of 0.009.
�I The lower coefficient will help maintain higher velocities during the initial years until the
subdivision is fully constructed. Experience has shown that roughness coefficients increase
�j as pipe ages due to growth on the pipe walls.
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Harmony Technology Park , November 15, 2000
PHASE
AREA
(SF)
ESTIMATED
CONTRIBUTION
(GPM) *, **
PEAK HR
FACTORS
***
ESTIMATED
CONTRIBUTION
(GPM)
NOTES
Celestica
-
27.34
2
54.68
Phase I & II
Bldg "A".
140000
8.84
2
17.68
Bldg "B"
140000
8.84
2
17.68
Bldg "C"
140000
8.84
2
17.68
Bldg "D"
140000
8.84
2
17.68
Bldg "Ell
140000
8.84
2
17.68
Bldg 6GF"
140000
8.84
2
17.68
Bldg 66G"
140000
8.84
2
17.68
Bldg 11H"
140000
8.84
2
17.68
Bldg "I"
140000
8.84
2
17.68
Bldg 64J"
140000
8.84
2
17.68
Bldg 16K"
140000
8.84
2
17.68
TOTAL
124.58
249.16
* This is based on actual usage provided by Celestica, Hewlett Packard and the City of Port
Collins. (See Appendixes C and E)
** The contributions in the table above do not include system wide infiltration.
* * * Peak Hour Factors are estimated at 2.0.
Celestica, Hewlett Packard and the City of Fort Collins provided the data required to
determine the contributions shown in the previous table. The building usage rates were
calculated from the metered water to Celestica and an average of metered water to similar
types of buildings in the Hewlett Packard campus north of Harmony Road. Celestica's
contribution takes into account the ability for the site to double in size. The City of Fort
Collins has recommended not reducing water usage for calculating the sanitary sewer sizes
due to process water being discharged to the sanitary sewer system. Celestica has indicated
that the manufacturing processes on site have very little evaporation so the loss of water is
minimal. Water usage records typically include irrigation requirements.. However, it should
rbe noted that none of the representative buildings use metered water for irrigation purposes.
Appendix D and Appendix F include the calculations and water usage rates that represent
the particular types of development within HTP.
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Harmony Technology Park November 15, 2000
peaking factors. The peak hourly factor was computed to be four times the average flow rate
expected in one hour and the peak daily flow rate is two times the average daily flow rate.
The evaluation notes that these are typical values used for small land areas. On page four
of the evaluation, it is pointed out that the peak flow, which is used as the base flow from
HTP, is 1,600 gpm. A copy of the relevant sections of the evaluation is included with this
report in Appendix A.
2.' SANITARY SEWER ANALYSIS
2.1 Existing System Description
The existing HTP, Second Filing has no sanitary service. The Celestica property has a
temporary lift station located in the southeast comer of their site. The lift station discharges
to the City of Fort Collins collection system located in Zeigler Road. This lift station was
installed as a temporary facility until such time a permanent sanitary sewer system is
completed.
2.2 Proposed System Description and Building Flows
The proposed sanitary sewer system that will serve the entire HTP (Filing 1 and 2 and future
Filings) consists entirely of gravity sewers. The existing force main that services HTP, First
Filing (Celstica) will be abandoned upon completion of gravity service to their property.
Therefore, the design considerations for the area in question are:
1) Adequate depth in order to connect to the existing Celestica collection system.
2) Adequate depth in order to provide service to all of the proposed buildings, which will
have no basements.
3) A collection system that has capacity to carry the design flow and maintain minimum
scouring velocities.
The following table summarizes the projected building flows that will be used to model and
design the proposed sanitary sewer system. A peaking factor of 2.0 is applied to the average
daily flow. The factor of 2.0 is used since it is assumed that the contributions will vary only
slightly over the course of the day. The peaking factor used in this report also corresponds
with the factor used in the evaluation referenced in Appendix A.
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Harmony Technology Park November 15, 2000
1. GENERAL LOCATION AND DESCRIPTION
1.1 Location
Harmony Technology Park (HTP), Second Filing is a tract of land located in the northwest
quarter of Section 4, Township 6 North, Range 68 West of the 6" Principal Meridian, City
of Fort Collins, Larimer County, Colorado. More specifically, the development is located
near the southeast corner of the intersection of Ziegler Road and Harmony Road. The project
is bounded on the north by Harmony Road, on the west by Ziegler Road, on the east by
Cambridge Avenue and on the south by the future Rock Creek Drive. Appendix B shows
an overall masterplan of the site improvements.
1.2 Description of Property
HTP, Second Filing consists of two lots. Lot 1, the northern lot, is 15.70 net acres. Lot 2,
the southern lot, is 35.35 net acres. In addition to the current proposal to develop Lot 1 and
Lot 2 of HTP, Second Filing, there are approximately 35 unplatted acres south of Celestica
and 16 unplatted acres south of HTP, Second Filing. The development on Lot 1, Lot 2 and
the unplatted property will consist mostly of market rate office space with minimal research
and development.
The existing Celestica manufacturing complex consists of 29.99 acres located in Harmony
Technology Park, First Filing. Currently, Phase I of the Celestica development is
constructed. A representative of Celestica has informed us that they could double their
current size if they were to expand. The Celestica development consists entirely of
manufacturing. Celestica has 1400 employees working 3 shifts, 24 hours per day and 7 days
per week.
1.3 HTP Sewer Alternative Evaluation
In February of 1997 The Sear -Brown Group completed an evaluation of the sanitary sewer
service to HTP. The evaluation was completed for the Blackfox Commercial Real Estate
Group, LLC. The evaluation reviewed the alternative methods of providing service to the
subdivision. The two methods were lift stations and gravity collection systems. Within the
evaluation some of The Sear -Brown Group's assumptions are stated.. For instance, at the
time of the evaluation, with no development in place, an estimated 400gpm was used for the
average daily flow from an industrial development. The evaluation used two different
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Harmony Technology Park November 15, 2000
TABLE OF CONTENTS
PAGE
' TABLE OF CONTENTS................................................................................................................. 1
1. GENERAL LOCATION AND DESCRIPTION.................................................................... 2
1.1 Location.............................................................................................................................. 2
1.2 Description of Property....................................................................................................... 2
1.3 HTP Sewer Alternative Evaluation..................................................................................... 2
2. SANITARY SEWER ANALYSIS......................................................................................... 3
2.1 Existing System Description............................................................................................... 3
2.2 Proposed System Description and Building Flows............................................................. 3
2.3 Analysis of the Proposed System........................................................................................ 5
■ 4. CONCLUSION.......................................................................................................................6
5. REFERENCES....................................................................................................................... 7
APPENDIX.......................................................................................................................................
Appendix A — Harmony Technology Park Sewer Alternative Evaluation (The Sear -Brown
Group)
Appendix B — Harmony Technology Park Masterplan (Proposed)
Appendix C — Hewlett Packard Metered Water
Appendix D — Harmony Technology Park, Second Filing Calculated Contributions
Appendix E — Celestica Phase I Metered Water
Appendix F — Celestica Phase I and Phase II Calculated Contributions
Appendix G — Sanitary Sewer Design Table (Harmony Technology Park)
— Sanitary Sewer (Minimum Flow) .
— Sanitary Sewer (Maximum Flow)
Sanitary Sewer Analysis Page 1
Harmony Technology Park November 15, 2000
November 15, 2000
9265.00
Mr. Terry Farril, P.E.
Fort Collins/Loveland and South Fort Collins Sanitation District
5150 Snead Drive
Fort Collins, 80525
RE: Harmony Technology Park
Sanitary Sewer Analysis
Dear Mr. Farril:
J•R ENGINEERING
A Subsidiary of Westrian
We are pleased to submit to you for your review and approval the attached Sanitary Sewer
Analysis. This report has been completed in order to adequately size the sanitary sewer
within Harmony Technology Park and to provide the District with estimated quantities of
wastewater. The quantities of wastewater will assure the District that it has adequate capacity
to provide service for the perpetuity of the development.
This report simply states the anticipated contributions of wastewater and demand for the
property within Harmony Technology Park. We used that information to size the collection
system to transport the wastewater to the limits of the referenced development. The demands
and contributions can be used by the City of Fort Collins and the South Fort Collins
Sanitation District to model the impacts on their respective systems.
We appreciate your time and consideration in reviewing this submittal. Please call if you have
any questions or if you need any additional information.
Sincerely,
John E. Tufte, P.E.
Project Engineer
Attachments
Robert Almirall, PE
Director of Operations
2620 East Prospect Road, Suite 190, Fort Collins, CO 80525
970-491-9888 • Fax: 970-491-9984 • w Jrengineering.wra
SANITARY SEWER ANALYSIS
HARMONY TECHNOLOGY PARK
November 15, 2000
Prepared by
JR ENGINEERING
2620 E. Prospect Rd., Suite 190
Fort Collins, Colorado 80525
(970) 491-9888
Prepared for
Hewlett Packard
Fort Collins, CO
Job Number 9265.00