CM-08-02-041DATE: February 4, 2008
SUBJECT: City Manager - February 8, 2008
ITEM: Action authorizing the City Manager to authorize payment of oversize
reimbursement to Hanna/Magee L.P. for wastewater main oversizing
through Legends Village Section 2, Phase 1.
Department: Engineering and Development Services
Staff Person: Danny Halden, P.E., City Engineer
Justification:
An 8" line would have sufficed the referenced subdivision, but the owner constructed a 10"
line through Phase 1 and will continue the 10" line through Phase 4 in order to provide for
upstream properties. Attached is a letter requesting reimbursement along with calculations
for justification of oversizing.
Funding:
Cost: $6,598.80
Source of funds: Oversize Account
Outside Resources:
Pape -Dawson Engineers
Background Information:
Subdivision improvements for Legends Village Section 2, Phase 1 were completed and
accepted by the City of Round Rock on January 19, 2007. The established rate for oversize
reimbursement is $2.60 per inch of oversize per linear foot of main installed.
Public Comment:
NA
Blue Sheet Format
Updated 01/20/04
idPAPE-DAWSON
ENGINEERS
LAND DEVELOPMENT ENVIRONMENTAL TRANSPORTATION WATER RESOURCES SURVEYING
January 14, 2008
Ms. Alysha Girard, Assistant City Engineer
Public Works Department
2008 Enterprise Drive
Round Rock, Texas 78664
RE: Legends Village — Section 2, Phase 1
Dear Ms. Girard:
The purpose of this letter is to inform you that the above referenced project contains
wastewater pipe, which is oversized for the project. A 10" wastewater line was installed
instead of the typical 8" line in Legends Village Sect 2 Ph 1. The 8" line at 4% grade has
capacity for a flow of 0.76 cfs. The 85% capacity flow is 0.65 cfs. Contributions from the
Legends Village projects would be 0.35 cfs and 0.41 cfs, for Peak Dry Weather and Peak Wet
Weather Flows, respectively. An 8" line would have sufficed for this project, but for possible
future uphill development, the owner has constructed the larger 10" line through Phase 1 and
will continue the 10" line through Phase 4 such that it is available for future projects.
There are 1,269 LF of the oversized 10" pipe for which the reimbursement per p.72 of the City
Platting Packet is:
$2.60/oversize inch/oversize LF x 2 oversize inches x 1,269 oversize LF = $6,598.80.
Please make a check for the above amount payable to Hanna/Magee L.P. #1 and send it to:
Blake Magee Company
Attn: Leanna Einhaus
1011 N. Lamar
Austin, Texas 78703
AUSTIN / SAN ANTONIO
WWW. PAPE-DAWSON.COM
Cm -De -Da -D --Ii
7800 Shoal Creek Blvd., Suite 220 West Austin, Texas 78757 P 512.454.8711 F 512.459.8867
Ms. Alysha Girard, Assistant City Engineer
Legends Village, Section 2, Phase 1
January 14, 2008
Page 2 of 2
To the best of my information and belief, the contractor has complied with the regulations
contained in Chapter Eight (8) of the Round Rock City Code. Please find enclosed
calculations and supporting exhibits for determining QPDWF and QPWWF.
Sincerely,
Pape -Dawson Engineers, Inc.
•
Eric C. Simpson, P.L.
Senior Project Manager i l;
Enclosure
H:A505\45\docs\71 Phase 1 -Construction Administration\05-Oversize Reimburse Request\Engineers Letter.doc
PAPE-DAWSON
ENGINEERS
Flow Calculations for
Legends Village Section 2 Phase 1 Oversize Reimbursement
Capacity for 8" PVC Pipe
Q = AR' z S' ' , A = Cross-sectional Area
11
PW = Wetted Perimeter
Rh = AiP = Hydraulic Radius
nPvc=0.013
S,,,;,,= 0.4% = 0.004
Dpipe= 0.67'
Rru1l 0.25d
A==[7Z(°2')2]=0.3526ft`
= 2irr = [2n -C)37')] = 2.105 ft
R1, = A / 13„. = 0.1675 ft
Q = 0. 3 [.3526][.1675]` 3[0.004]' 2 = 0.76 cfs
85% Q = 0.85*0.76 = 0.647 cfs
Peak Flows for Legends Village Section 2 Ph 1 and 4
QPDWF = ([ 18 + (0.018 * F)0'5 ] / 4 + (0.018 * F)°'5) * F
F= (80 gal/day/person) * (Number of LUE's) * (3.5/1440) = 28.78 gpm
Number of LUE's = 148
QPDWF = ([ 18 + (0.018 * 28.78)0'5] / 4 + (0.018 * 28.78)x' 5) * 28.78 = 155.4 gpm
=155.4gpm * (0.1337 ft3/gal 1-120) / (60 min/sec) = 0.346 cfs
I/1 = 1000 gal/acre/day * (39.8 acre) * (0.1337 ft3igal H20) / (24 hr/day) / (3600 sec/ hr)
=0.0617 cfs
QPWWF = QPDWF + I/I = 0.346 cfs + 0.0617 cfs = 0.408 cfs
piPAPE-DAWSON
ENGINEERS
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Request for City Council/City Manager Action
ED City Council Ei City Manager
Submit completed form for all City Manager and City Council approvals.
Department Name: Engineering and Development Services
Contact Person: Latha Kumar/Tiffany Calley
Project
Manager/Resource: William Dobrowolski, III, P.E.
Project Coordinator: NA
Assigned Attorney: Steve Sheets
City Manager Approval Date:
Blue Sheet Wording
For Administration Use ONLY
FEB O 7 2uu
Received:
Tag # l44- ((-- - t
Original Documents Received: 1
Project Name: Legends Village Section 2, Phase 1
ContractorNendor: Hanna/Magee L.P.
Funding Source:
Amount:
Account Number:
February 8, 2008
Oversize Account
$6,598.80
Action authorizing the City Manager to authorize payment of oversize rembursement to Hanna/Magee L.P. for wastewater main oversizing through Legends
Village Section 2, Phase 1.
Finance Information
Is Funding Required?
0
0
Finance Approval
Finance
Finance
Purchasing
Budget
Yes Q No
Initial Construction Contract
Construction Contract Amendment #
Change Order
Change in Quantity
Unforeseen Circumstances
Initial Professional Services Agreement
Supplemental Professional Svcs. At #
Purchasing/Service Agreement
Purchase Order
Item(s) to be purchased:
Amount
Other (Please clearly identify action on lines below) $6598.80
Oversize Reimbursement
Date
Date
Date
Date
Required for Submission of ALL City Co
and itv Mena terns
7/ Project Mgr. Signature: 567 14v Date: i/Zy% 006
Dept. Director Signature.
City Attorney Signature*:
City Manager Signature:
Pe—, Date: 2P2/042
is required for all nouns.
Updated 2/16/06
Request for City Council/City Manager Action
0 City Council 0 City Manager
For Administration Use ONLY
Received:
Tag #
Submit completed form for all City Manager and City Council approvals. _Original Documents Received:
Department Name: Engineering and Development Services
Contact Person: Latha Kumar/Tiffany Calley
Project
Manager/Resource: William Dobrowolski, III, P.E. Funding Source:
Project Coordinator: NA Amount
Project Name: Legends Village Section 2, Phase 1
ContractorNendor: Hanna/Magee L.P.
Assigned Attorney: Steve Sheets Account Number:
City Manager Approval Date:
Blue Sheet Wording
February 8, 2008
Oversize Account
$6,598.80
Action authorizing the City Manager to authorize payment of oversize rembursement to Hanna/Magee L.P. for wastewater main oversizing through Legends
Village Section 2, Phase 1.
Finance Information
Is Funding Required? Q Yes Q No
Initial Construction Contract
Construction Contract Amendment #
Change Order
Change in Quantity
Unforeseen Circumstances
Initial Professional Services Agreement
Supplemental Professional Svcs. Ai #
E:1 Purchasing/Service Agreement
EDPurchase Order
item(s) to be purchased:
Amount
0 Other (Please clearly identify action on lines below) $6,598.80
Finance Approval
XQFinance
EJFinance
Purchasing
0 Budget
Oversize Reimbursement
B. Ramsey
N/A E. Wilson
N/A EE Bowden
N/A prb
Date 2/6/2008
Date 2/6/2008
Date 2/5/2008
Date 2/5/2008
Required for Submission of ALL City Council and City Manager Items
Project Mgr. Signature: Date:
Dept. Director Signature: Date:
City Attorney Signature*: Date:
City Manager Signature: Date:
Legal Approval is required for all items.
Updated 2/16/06