HomeMy WebLinkAboutCT 14-09; UPTOWN BRESSI RANCH; SEWER STUDY FOR BRESSI RANCH; GPA 14-04, MPA 178I, CT 14-09, PUD 14-10, SDP 14-13, SDP 16-06, CUP 14-09, CUP 16-01, EIR 15-01, LFMP 87-17A; 2015-06-24RECORD COPY
Initial
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Date
SEWER STUDY
FOR
UPTOWN BRESSI
(LOTS 29 THRU 32)
March 27, 2015
Revised June 24, 2015
(Job Number 17169)
RICK
ENGINEERING COMPANY
rickengineering.com
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Sewer Study
For
Uptown Bressi
(LOTS 29 THRU 32)
GPA 14-04, MP 178(1), CT 14-09, PUD 14-10
SDP 14-13, CUP 14-09
Shea Homes
City of Carlsbad
REC Job No. J-17169
Prepared: March 27, 2015
Revised: June 24, 2015
Timothy W. Gabrielson
RCE 51503
Prepared for:
9900 Mesa Rim Road
Shea Business Properties
9900 Mesa Rim Road
San Diego, California 92121
Attn: Sarah Morrell
San Diego, California 92121
Attn: Kevin McCook
(858) 526-6554 (858) 526-6500
Prepared by:
Rick Engineering Company
5620 Friars Road
San Diego, California 92110
(619) 291-0707
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Table of Contents
Introduction 3
Vicinity Map 5
Design Criteria, Populations and Abbreviations 6
Sample Calculation 7
Conclusion 8
Proposed Design Spreadsheets ..................................................... Appendix A
Map Pocket -Sewer Report Exhibit
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Introduction
\_j This Sewer Study is being prepared to provide the preliminary sewer flow calculations
and capacity information in support of the on-site sewer system that will serve the
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proposed Uptown Bressi development. Uptown Bressi is a proposed mixed use
LJ development that will consist of 125-multifamily condominium units as well as 91,250
square feet of commercial space. The proposed uses for the commercial space include
such facilities as restaurants, grocery store, drug store, and retail space.
The proposed mixed use development represents a joint venture by Shea Homes and Shea
Business Properties. The project site is located within the Bressi Ranch community of the
City of Carlsbad, adjacent to Palomar Airport Road and approximately 4.2 miles east of
the Interstate 5. The project site is bound by Palomar Airport Road on the north, El Fuerte
Street on the west, Gateway Road on the south and Colt Place on the east. The project site
1 .•. J has been previously mass graded (Dwg No. 400-8A) with utilities stubbed to the site for
future use as a part of improvements to El Fuerte street (Dwg No. 400-8E), Gateway Road
(Dwg No. 400-8B) and Colt Place (Dwg No. 421-3).
The existing zoning and general plan for the site is Planned Industrial (P-M) within the
Bressi Ranch Master Plan (MP-178). The proposed zoning and General Plan shall be
Residential High Density (R-23) and Local Commercial (L).
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The proposed onsite collection system is to be a gravity collection system utilizing 8"
sewer mains to route the sewerage generated by the project to the existing sewer systems
located in Gateway road and Colt Place. For the sewer collection system servicing the
residential portion, the sewer mains and manholes shall be a public sewer system as
required by the City. For the sewer collection system servicing the commercial portion of
the site, the sewer mains and manholes shall be private.
The proposed project includes:
Total project site area is approximately 17.71 acres
125 Multi-family residential condominium homes on 7.67 acres.
91,250 sf of Commercial retail space on 9.97 acres.
Pool restroom located within the residential community
** -To determine the design flowrate of the Pool restroom building, the following criteria
was used:
Per the County of San Diego Design manual for onsite wastewater treatment
systems (March 2010 edition), Swimming Pools and Bath Houses are
estimated to generate 10 gallons per person per day.
Per the California State Code Title 22, the maximum bather load for a pool is 1
bather per 20 square feet.
The proposed pool area is roughly 1,200 sf
1,200 + 20 = 60 bathers
60 Bathers x 10 Gal/person/day= 600 GPD
600 gpd + 220 gpd/EDU == 2.6 EDU
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Vicinity Map
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Design Criteria, Populations and Abbreviations
The following is a list of design criteria, given by City of Carlsbad staff or obtained from
the City of Carlsbad Engineering Standards Volume 1 (2004 edition, Rev. 6/30/08) and
the Carlsbad Sewer Master Plan (2012). For the design of the sewer system:
• An Equivalent Dwelling Unit (EDU)= 220 gal/day, Average Daily Flow (ADF)
• For ADF less than 100,000 gal/day, a Peaking factor (PF) of 2.5 times the
Average Daily Flow (ADF) shall be used to determine Peak Daily Flows (PDF)
• Residential: Single Family Residence= 1 EDU= 220 gpd
• Commercial: 1 EDU/1,800 sf = 220 gpd/1,800sf or 1,222 gpd/10,000 sf
• Pool area: 600 gpd = 2.6 EDU (see page 4 for further clarification)
• 8" PVC minimum diameter for public mains. 6" PVC is permitted with a
maximum of 10 units.
• Low flow/dead end lines shall be designed to achieve a minimum velocity of 2 to
2.5 feet per second at Yi full. For and 8" line this equates to a minimum slope of
0.7 feet per 100 feet (0.7%).
• Minimum pipe slope for 8" line= 0.4 feet per 100 feet (0.4%)
0.5 feet per 100 feet is desired (0.5%)
• Maximum velocities greater than 10 feet per second should be avoided.
• Sewer pipe material is to be polyvinyl chloride pipe (PVC) with Manning's "N"
value of 0.011.
• gpd = Gallons per Day
• GPM = Gallons per Minute
• CFS= Cubic Feet per Second
• MGD = Million Gallons per Day
• DU, EDU= Dwelling Units for Residential, Equivalent Dwelling Units for
Commercial
• AH = Access Holes
•:• Number of Dwelling Units is based on the VTM for Uptown Bressi.
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Sample Calculation
Uptown Bressi, Peak Dry Weather Flow, AH 4 to AH 3
Population Data
Number of equivalent dwelling units inline = 0 DU I EDU
Previous Population= 26 DU I EDU
Cumulative DU's = 26 DU I EDU
Average Flowrate = 26 x 220 gpd/DU = 5,720 gpd
5,720 GPD + 24 hrs/day+ 60 min/hr= 3.97 GPM
Peaking Factor = 2.50 (per City of Carlsbad Engineering Standards, Chapter 6)
Peak Daily Flow (PDF)= 5,720 gpd x 2.5 + 1,000,000 = 0.014 MGD
1 gal/day= 1.5475 x lOe-6 cfs, therefore Q = 0.022 cfs
Pipe Characteristics
n=0.011
Diameter= 8"
Q = 0.022 cfs
Slope = 2.88%
V = (1.486/n) x R"(2/3) x S"(l/2)
Velocity= 2.0 fps~ 2.0 fps, therefore OK
dn/D = 0.06 < . 50 , therefore OK
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Conclusions
The sewer pipes within the project site area have been designed to meet the sewer design
standards of the City of Carlsbad. This study has confirmed that the use of 8-inch
diameter PVC SDR-35 throughout the project site will provide sufficient capacity for the
proposed Multifamily and Commercial sites. To the greatest extent possible, the sewers
have been designed with a mean velocity of at least 2. 0 fps based upon the peak dry
weather flow rate. In those locations where the contributing peak dry weather flow rate
was insufficient to obtain a velocity of 2.0 fps, such as at the upstream end of reaches, a
minimum pipe slope of 1 % was utilized.
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Appendix A
Proposed Design Spreadsheets
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LINE
NO.
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FROM TO CUM. DU/EDU POPULAl IUN SERVt:U
A.H. A.H. -UPSTREAM IN LINE CUMULATIVE
Access Hole DU/EDU DU/EDU
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9 8 0.0 4.6 4.6
8 7 4.6 4.1 8.7
7 6 8.7 0.0 8.7
10 6 0.0 9.3 9.3
6 4 17.9 0.0 17.9
5 4 0.0 8.1 8.1
4 3 26.0 0 26.0
3 2 26.0 0 26.0
2 1 26.0 0 26.0
1 Ex.22 26.0 0 26.0
19 18 0 11 11
18 17 11 10 21
17 16 21 12 33
16 12 33 5 38
15 13 0 4 4
14 13 4 2 6
13 12 6 9 15
12 11 53 0 53
28 27 0 9.2 9.2
27 26 9.2 15.6 24.7
26 25 24.7 6 30.7
25 24 30.7 6 36.7
31 30 0.0 10 10.0
30 29 10.0 1 11.0
29 24 11.0 9 20.0
24 23 56.7 5.6 62.3
38 37 0.0 11 11.0
37 36 11.0 0 11.0
36 34 11.0 0 11.0
35 34 0.0 12 12.0
34 33 23.0 10 33.0
33 32 33.0 3 36.0
32 23 36.0 1 37.0
23 22 99.3 0 99.3
22 21 99.3 0 99.3
21 20 99.3 0 99.3
20 Ex. 19 99.3 0 99.3
SEWER SUMMARY -UPTOWN BRESSI
PREPARED BY RICK ENGINEERING COMPANY
JOB NO. J-17169
AVERAGE PEAK/AVG PEAK DAILY FLOW LINE
FLOW RATE RATIO SIZE
(GPM) M.G.D. CFS (INCHES)
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0.70 2.50 0.003 0.004 8
1.32 2.50 0.005 0.007 8
1.32 2.50 0.005 0.007 8
1.41 2.50 0.005 0.008 8
2.74 2.50 0.010 0.015 8
1.23 2.50 0.004 0.007 8
3.97 2.50 0.014 0.022 8
3.97 2.50 0.014 0.022 8
3.97 2.50 0.014 0.022 8
3.97 2.50 0.014 0.022 8
1.68 2.50 0.006 0.009 8
3.21 2.50 0.012 0.018 8
5.04 2.50 0.018 0.028 8
5.81 2.50 0.021 0.032 8
0.61 2.50 0.002 0.003 8
0.92 2.50 0.003 0.005 8
2.29 2.50 0.008 0.013 8
8.10 2.50 0.029 0.045 8
1.40 2.50 0.005 0.008 8
3.78 2.50 0.014 0.021 8
4.69 2.50 0.017 0.026 8
5.61 2.50 0.020 0.031 8
1.53 2.50 0.006 0.009 8
1.68 2.50 0.006 0.009 8
3.06 2.50 0.011 0.017 8
9.52 2.50 0.034 0.053 8
1.68 2.50 0.006 0.009 8
1.68 2.50 0.006 0.009 8
1.68 2.50 0.006 0.009 8
1.83 2.50 0.007 0.010 8
5.04 2.50 0.018 0.028 8
5.50 2.50 0.020 0.031 8
5.65 2.50 0.020 0.031 8
15.17 2.50 0.055 0.084 8
15.17 2.50 0.055 0.084 8
15.17 2.50 0.055 0.084 8
15.17 2.50 0.055 0.084 8
DESIGN dn(FT)
SLOPE n= dn/D
(%) 0.011
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2.07 0.02 0.03
2.08 0.03 0.04
2.05 0.03 0.04
3.25 0.03 0.04
2.08 0.04 0.06
6.44 0.02 0.03
2.88 0.04 0.06
2.01 0.05 0.07
2.02 0.05 0.07
2.09 0.05 0.07
1.04 0.03 0.05
1.09 0.05 0.07
2.00 0.05 0.08
1.33 0.06 0.09
3.24 0.01 0.02
3.64 0.02 0.03
2.98 0.03 0.05
1.27 0.07 0.11
1.51 0.03 0.04
1.99 0.05 0.07
1.59 0.05 0.08
1.06 0.07 0.10
1.05 0.03 0.05
3.04 0.03 0.04
3.92 0.03 0.05
1.05 0.09 0.13
1.00 0.03 0.05
2.04 0.03 0.04
1.83 0.03 0.05
1.00 0.04 0.06
1.00 0.06 0.09
1.01 0.07 0.10
6.52 0.04 0.06
1.12 0.11 0.16
2.06 0.09 0.13
2.08 0.09 0.13
1.99 0.09 0.13
* -Equivalent Dwelling Unit (EDU) for Commercial retail space is 1 EDU per 1,800 sf (City of Carlsbad Engineering Standards, Volume 1, Chapter 6, E.2.B )
VELOCITY
Rh (fps) Comments
(ft)
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0.01 1.1
0.02 1.3
0.02 1.3
0.02 1.6
0.03 1.7
0.01 1.9
0.03 2.0
0.03 1.9
0.03 1.9
0.03 1.9
0.03 1.1
0.03 1.4
0.03 2.0
0.04 1.8
0.01 1.0
0.01 1.4
0.02 1.8
0.05 2.0
0.02 1.1
0.03 1.8
0.04 1.8
0.04 1.7
0.02 1.1
0.02 1.6
0.03 2.1
0.06 2.0
0.03 1.1
0.02 1.3
0.02 1.4
0.03 1.2
0.04 1.5
0.04 1.7
0.03 3.0
0.07 2.3
0.06 2.8
0.06 2.8
0.06 2.7
** -The Pool Bldg has been assigned the value of 2.6 EDU for the purposes of this study. This based upon a maximum bather loading of 60 and a wastewater flowrate of 10 GPD I Person.
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County Of San Diego e Department of Environmental Health
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Design Manual for
Onsite Wastewater
Treatment Systems
March 22, 2010 Edition
(Updated November 25, 2013)
"Environmental and public health through leadership, partnership and science
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The following chart can be used along with the EPA Onsite Wastewater Treatment Systems Manual
to estimate projected wastewater flows from commercial establishments.
GALLONS/
TYPE OF ESTABLISHMENT PERSONS/
DAY
Small dwellings/cottages w/seasonal occupancy 50
Single family dwellings 75
Multi-family dwellinQs (apartments) 60
Rooming houses 40
BoardinQ houses 50
Add. Kitchen wastes for nonresident. boarders 10
Hotels without private baths 50
Hotels with private baths (2 persons/day) 60
Restaurants (toilet/kitchen wastes per patron) 7 to 10
Restaurants (kitchen wastes per meal) 2.5 to 3
Additional for bars/cocktail lounges 2
Tourist camps/trailer parks w/cent. bath 35
Tourist or mobile home parks w/individual baths 50
Resort camps (niqht/day) w/limited plumbinQ 50
Luxury camps 100 to 150
Work/Constructions camps -semi permanent 50
Dav camps -no meals served 15
Day schools witho1..1t cafeterias, qyms, or showers 15
Day schools with cafeterias, but no gyms or showers 20
Day schools with cafeterias, qyms, showers 25
BoardinQ schools 75 to 100
Day workers at schools/offices per shift 15
Hospitals 150 to 250+
Institutions other than hospitals 75 to 125
Factories (qallons per person per shift, exclusive of industrial waste) 15 to 35
Picnic parks (toilet wastes only, qallons per person) 5
Picnic parks with baths, showers, toilets 10
Swimming pools and bath houses 10
Luxury residences and estates 100 to 150
Country clubs (per resident member) 100
Country clubs (per nonresident member) 25
Motels (per bed space) 40
Motels w/bath, toilet, ~md kitchen waste 50
Drive-in theaters (per car space) 5
Movie theaters (per seat) 5
Airports (per passenger) ·3 to 5
Self service laundries (gallons per wash per customer) 50
Stores (per toilet room) 400
Service station (per vehicle served) 10
Churches 5
38