Cabrillo
Center
Community
Paci ca
Fassler Ridge
Rockaway
Cattle Hill
Highway 1
East Side
Flats
Pad
O
ces
District
School E.S.
Station Vallemar
Plant Police Water Recycling
Center
Shopping
Linda Mar
Quarry Site
Rockaway
Hillside
East Fairway
Hill
Gypsy
and Fassler
Rockaway,
Vallemar,
& Mori Point
West Fairway Park
Golf Course,
Sharp Park
Beach
State
Paci ca
Headlands
Quarry, &
Rockaway Beach,
at up to 30 dwelling units per gross acre.
* Sites 0.5 acres or more may be developed
Coastal Access Points are keyed to Table X-X
Subareas
Speci c Sites
City Limits
Planning Area
Improved
Trailhead to be
Existing Trailhead
On-street trail
Proposed Trail
Existing Trail
View Corridor
(Blu
top/View)
Coastal Access Points 8
(Beach)
Coastal Access Points 7
Opportunity
Park Improvement
Park Opportunity Site
Transportation Corridor
Conservation
Park
Utilities
Beach/Commuter Parking
Public and Semi-Public
Serving Commercial
Low Intensity VisitorCommercial
Visitor-Serving
Service Commercial
Retail Commercial
(up to 50 units/acre)
Mixed Use Center
(16 -26 units/acre)*
Mixed Use Neighborhood
(16 -21 units/acre)*
High Density Residential
(10 -15 units/acre)
Medium Density Residential
(3 -9 units/acre)
Low Density Residential
(0.2 -2.0 units/acre)
Very Low Density Residential
(up to 0.2 units/acre)
Open Space/Agriculture/Residential
0 1/4 1/2
MILES
1 Paci ca, Central
Figure 4-7:
Figure 4-7: Pacifica, Central
11.a
Packet Pg. 278 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4LAND USE
PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT 4-21
building footprints, and preserve large areas of open
space and support wildlife movement.
The Plan envisions a small new public open space as
part of any new development at Eureka Square, and
pedestrian improvements to create a good walking
link through the neighborhood linking the beach to
the ridgetop.
Central Pacifica
Figure 4-7 shows the central section of Pacifica. The
map includes:
• Sharp Park Golf Course, the West Fairway
Park neighborhood, Mori Point, the Rockaway
Quarry, Rockaway Beach, and the Rockaway
Headlands in the Coastal Zone;
• Sharp Park; the East Fairway Park, Vallemar, and
Rockaway neighborhoods; and Sweeney Ridge,
Cattle Hill and Fassler Ridge, east of Highway 1.
This sub-area includes the Rockaway Beach district,
the Police Station, and the Shelldance Nursery (the
only location east of Highway 1 within the Coastal
Zone).
Sharp Park Golf Course, West Fairway Park,
and Mori Point
The central stretch of Pacifica’s coast includes Sharp
Park Golf Course, Mori Point, and the small singlefamily subdivision of West Fairway Park. Sharp Park Municipal Golf Course is part of a land bequest made
to the City and County of San Francisco early in the
20th Century on the condition that the land be used
for public recreation. West Fairway Park is a small single-family residential subdivision. On the south, the neighborhood meets the base of undeveloped Mori
Point, managed as part of Golden Gate National Recreation Area.
The Plan designates Sharp Park Golf Course and
Mori Point as regional park land. Current characteristics may be maintained, and environmental restoration will be a priority. The West Fairway Park neighHabitat restoration of the Laguna Salada area is planned, following extensive habitat improvements at neighboring Horse Stable Pond and Mori Point (top). The General Plan envisions the Rockaway Beach district growing into a more distinct and high-profile visitor destination (middle). The General Plan designates most of Fassler Ridge (bottom) as Residential/Open Space to conserve its open space character.
11.a
Packet Pg. 279 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4-22 PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT
borhood’s existing land use is reinforced by the Plan’s land use designations.
Sharp Park Beach is open to the public between the
Pier and Mori Point, while Sharp Park Golf Course
provides a unique recreational asset. Mori Point is a
spectacular section of the GGNRA. The General Plan
proposes trail improvements and critical new trail
segments that would link the coastal trails with the
inland ridges. This segment of the Pacifica coastline
includes view corridors from Highway 1 into Sharp
Park Golf Course and toward Mori Point and Mori
Ridge that will be preserved.
Rockaway Beach, Quarry, and Headlands
Rockaway Beach is a small, pedestrian-oriented area
with shops, restaurants, and lodging and a small
beach, with parking and other amenities. The vacant
Quarry site occupies about 94 acres west of High-way
1 and south of Mori Point. About 30 acres of the site
are on slopes of 35 percent or steeper. The Calera Creek Water Recycling Plant, at the north end of the former
quarry, releases treated wastewater into Calera Creek,
which has a naturalized channel, a restored riparian
corridor, and a paved walking and cycling path. The
Headlands is a rocky promontory separating Rockaway Beach and Pacifica State Beach, and is crossed by a scenic trail.
The Quarry site is Pacifica’s most prominent potential
development site. Prior to any future development,
the property owner must complete reclamation of
the former quarry pursuant to the State Mining and
Reclamation Act (SMARA) and the Pacifica Municipal Code. Approximately half of the site, including the upland areas and the Calera Creek riparian corridor, is designated for Conservation. This area will remain open space, with trail improvements connecting Mori Point with Rockaway Beach. The Flats and the Pad overlooking Rockaway Beach are designated
for Visitor-Serving Commercial development, supporting such potential uses as a resort hotel, boutique hotels, visitor attractions, and retail uses integrated with the Rockaway Beach district. Redevelopment
of the Quarry site could expand this visitor-oriented
area. Any development of the Quarry site will require
detailed evaluation of biological re-sources to ensure
that sensitive habitat and wetlands are protected; as a result, the footprint of development could be smaller
than the area designated. While housing may be proposed as part of a plan for the site, Ordinance No. 391 provides that rezoning to allow residential uses may
occur only if approved by a vote of the electorate. Figure 4-4 indicates removal of the Hillside Preservation District (HPD) overlay from the Flats portion of the site, which would also require approval by a vote
of the electorate. Development in the Quarry Flats
should include new public open space.
The existing Rockaway Beach district also offers
opportunities for infill and redevelopment, subject
to an appropriate assessment of potential coastal hazards and vulnerabilities. The General Plan envisions the Rockaway Beach district growing into a more distinct and high-profile visitor destination, with strong links to the natural setting of beaches, headlands, and ridges.
The General Plan proposes new coastal trail segments,
and new trails would link the coastal trails with the
inland ridges. Improvements to Highway 1 should
ease travel, accommodate vehicles as well as bikes and
pedestrians, and improve access into the Rockaway
Beach district. Coastal views from Highway 1 toward
Mori Point, Cattle Hill, and the Rockaway Headlands
are important in establishing the identity of this area and Pacifica as a whole. The United States Geological Survey established the place name “Aramai Point” for the Rockaway Headlands in 2021 in recognition of
the indigenous peoples that occupied the area prior to
European settlement.
Sharp Park, East Fairway Park, and Sweeney
Ridge
Sharp Park east of Highway 1 includes a portion of
the Golf Course, and is primarily undeveloped at its
higher elevations. Land in the vicinity of the former
rifle range in Sharp Park could potentially support
sports fields for school and community use. Sweeney
Ridge features over 1,000 acres of preserved regional
open space in the GGNRA, with the protected San
11.a
Packet Pg. 280 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT 4-23
21 22
23 24 25 26
27 Devil’s Slide Trail
San Pedro Creek
Old San Pedro MountianRd
Coastal Trail
Pedro Point Trail
Rosita Road Trail
DEVIL’S SLIDE TUNNEL
SAN PEDRO AVE
ROSITA
RD
ROBERTS
RD
GRAND AVE
FASSLER AVE
LINDA MAR BLVD
DESOLO
DR
PERALTA RD
ADOBE RD
LINDA MAR BLVD
ALICANTE DR
MANZANITA DR
SEVILLE DR
CRESPI DR
CRESPI DR
Fassler Ridge
Crespi Dr
Lower
San Pedro Ave Site
Undeveloped
Center
Shopping
Pedro Point
Center
Shopping
Linda Mar
Ranch
Shamrock
Hillsides
& Park Paci ca Linda Mar
Park
Skate Center
Community
Paci ca
E.S.
Cabrillo
Site
Park-and-Ride
Linda Mar
Paci c Bay
Christian
School
(GGNRA)
Headlands
Pedro Point
State Beach
Paci ca
Adobe
Sanchez
School
Linda Mar
Art Center
Sanchez Park/
Pedro
Point
& Shelter
Cove
Paci ca
State Beach
West Linda Mar
at up to 30 dwelling units per gross acre.
* Sites 0.5 acres or more may be developed
keyed to Table X-X
Coastal Access Points are
Planning Area
City Limits
Speci c Sites
Subareas
Opportunity
Park Improvement
Park Opportunity Site
Proposed Trailhead
Existing Trailhead
On-street trail
Proposed Trail
Existing Trail
View Corridor
(Blu
top/View)
Coastal Access Points 8
(Beach)
Coastal Access Points 7
Transportation Corridor
Urban Reserve
Sandy Beach
Conservation
Park
Utilities
Beach/Commuter Parking
Public and Semi-Public
Serving Commercial
Low Intensity VisitorVisitor-Serving Commercial
Service Commercial
Retail Commercial
(up to 50 units/acre)
Mixed Use Center
(16 -26 units/acre)*
Mixed Use Neighborhood
Coastal Residential Mixed Use
(16 -21 units/acre)*
High Density Residential
(10 -15 units/acre)
Medium Density Residential
(3 -9 units/acre)
Low Density Residential
(0.2 -2.0 units/acre)
Very Low Density Residential
(up to 0.2 units/acre)
Open Space/Agriculture/Residential
(up to 0.1 units/acre) Transitional Open Space/Residential 0 1/4 1/2
MILES
1 Paci ca, Southwest
Figure 4-8:
Figure 4-8: Pacifica, Southwest
11.a
Packet Pg. 281 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4-24 PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT
Francisco watershed to the east. Mori Ridge descends
toward the coast, forming the southern boundary of
this sub-area. The small East Fairway Park subdivision is located between Mori Ridge and Sharp Park and Fairway Park contains several baseball fields and
a small playground. An undeveloped site along Highway 1 is designated for Low Density Residential development, while a larger hillside property at the east edge of the neighborhood is designated Open Space/
Agriculture/Residential.
Mori Ridge, at the southern edge of this sub-area, is
part of GGNRA. The Pacifica General Plan supports
the creation of a nucleus of GGNRA park activities
at Shelldance Nursery, and proposes a trail connection over Highway 1 connecting Mori Point with the proposed park visitors’ center, and the trail up Mori
Ridge to the Bay Area Ridge Trail system.
Vallemar, Rockaway, and Fassler
The Vallemar neighborhood follows Reina del Mar
Avenue up the narrow Calera Creek valley. Around
the intersection of Reina del Mar and Highway 1, there
is a small commercial area as well as Vallemar School,
the Pacifica School District offices, and the police station. Mori Ridge, Sweeney Ridge, and upper Cattle Hill are mostly protected open space, and afford recreational opportunities. Undeveloped land on the upper slopes of the valley are designated primarily for Open
Space/Agriculture/Residential to ensure that new
development is minimal, in recognition of environmental constraints and limited access.
Cattle Hill is the next prominent ridgeline south of
Mori Ridge, between the Vallemar and Rockaway
valleys. Much of the ridge is protected as permanent open space. The western face of Cattle Hill is privately-owned, and some development may occur
here in the future. The ridge is designated as Open
Space/Agriculture/Residential to ensure that new
development is appropriate to the rugged conditions
and high scenic value of the ridge. The General Plan
also proposes a public trail up Cattle Hill, providing
a connection between Rockaway Beach and Sweeney Ridge, requiring an easement or dedicated public access. Potential development sites along Highway 1 at
the base of the hill may be well-suited to mixed-use
residential and commercial uses. Commercial development should feature attractive frontage treatment along the highway and should consider ways to mitigate traffic impacts to Highway 1.
The Rockaway neighborhood ascends from Highway 1 along Rockaway Beach Avenue up another narrow valley. There are many vacant residential lots
on mapped rights-of-way on the upper slopes of the
Rockaway valley to the north and south, but topography makes development challenging. There is a very The scenic Pedro Point neighborhood
overlooks Pacifica State Beach.
11.a
Packet Pg. 282 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4LAND USE
PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT 4-25
small commercial area where Rockaway Beach Avenue
meets Highway 1.
Fassler Avenue traverses a ridge separating Rockaway
from the much broader San Pedro Valley to the south.
Fassler Ridge is mainly in private ownership and presents potential development opportunities overlooking Pacifica State Beach and Rockaway Beach. The General Plan designates most of the ridge as Open Space/ Agriculture/Residential to conserve its highly-visible
open space character. A new trail is proposed that
would connect the site of the historic Portola camp
on Crespi Drive—and Pacifica State Beach—with the
San Francisco Bay Discovery Site on Sweeney Ridge.
Southwestern Pacifica
Figure 4-8 shows the southwestern part of the Planning Area, including:
• Pacifica State Beach, Shelter Cove, and the Pedro
Point neighborhood in the Coastal Zone;
• The West Linda Mar neighborhood and areas
outside City limits, east of Highway 1.
Pacifica State Beach
Pacifica State Beach, also known as Linda Mar Beach,
is a long sandy beach on a small bay formed by the
Rockaway Headlands and Pedro Point. Pacifica State
Beach is an outstanding recreational asset for the City and attracts over one million visitors annually from
the region and beyond for its surfing, beach environment and scenery in close proximity to San Francisco.
Recent restoration work and improvements to parking and access has helped to ensure that the beach will remain a popular natural environment for years
to come. Views from Highway 1 toward the crescent
sweep of Pacifica State Beach, the Headlands, and
Pedro Point are a defining element for Pacifica, and
will be preserved across the protected park land.
Pacifica State Beach supports primarily wintering
and/or migrating Western snowy plovers, a federally
threatened bird species. The beach must continue to
be managed to ensure that recreational use does not
interfere with the species’ habitat requirements. Steelhead trout from the Central California Coast Ecologically Significant Unit are listed as threatened under the federal Endangered Species Act. Steelhead are
known to spawn in several parts of San Pedro Creek,
and the City will continue to support the preservation
of viable steelhead migration.
Pedro Point and Shelter Cove
The Pedro Point neighborhood sits on the slope
of the promontory that marks Pacifica’s southern
boundary. The neighborhood is characterized by single-family houses climbing up the slope, with some commercial development, including a small shopping center, on the flat land near the beach. The neighborhood is separated from the coastline by the
berm of the former Ocean Shore Railroad. Pedro
Point abuts City-, County-, and State-owned land at
the Point’s higher elevations to the south. This land is within the Golden Gate National Recreation Area’s
legislative boundary, and could be included in the
park in the future. The western tip of Pedro Point
descends to Shelter Cove, where another cluster of
houses exists on a single 17-acre parcel. Land access
to Shelter Cove has been limited to steep pedestrian
trails since the former roadway to the area washed
out in the 1980s.
The Plan reinforces existing land use patterns for all
developed parts of the sub-area. There is potential for Pedro Point shopping center and adjacent parcels to
accommodate some new retail development, which
could provide local convenience shopping as well as
visitor-oriented businesses. The Plan retains flexibility for any future development on the vacant site west of the shopping center, identified as the Undeveloped
San Pedro Avenue Site, which could have residential
and small-scale commercial and visitor-oriented uses.
Development of the site will require detailed evaluation of coastal hazards/vulnerabilities and biological resources to ensure that any sensitive habitat and wetlands that may exist on the site are protected;
11.a
Packet Pg. 283 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4-26 PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT
Middle Fork San Pedro Creek
Old San PedroMtnRd
Weller Ranch Trail
Montara Mountain Trail
Rosita Road Trail
ail
San Pedro Creek
ROSITA RD
AP RK PACIFIC A AVELINCOLN BLVD LINDA MAR BLVD
ALICANTE DR
MANZANITA DR
SEVILLE DR
LERIDA
WAY
CRESPI DR
ODDSTAD
BLVD
EVERGLADES
DR
TERRANOVA
BLVD
County Par k
Sa n P e d r o Vall e y
Ranch
Millwood
E.S.
Ortega
Mall
Park
Library
Sanchez
Site School
Oddstad
E.S.
Ortega
Park
Oddstad
Art Center
Sanchez Park/
Adobe
Sanchez
High School
Terra Nova
Hillsides
Park Paci ca Linda Mar &
Stables
Paci ca
Park
Hillsides
Park Paci ca
Linda Mar &
Hillsides
Park Paci ca
Linda Mar &
Fassler Ridge
Paci c Bay
Christian
School
West Linda Mar
and Park Paci ca
East Linda Mar
at up to 30 dwelling units per gross acre.
* Sites 0.5 acres or more may be developed
Planning Area
City Limits
Speci c Sites
Subareas
Opportunity
Park Improvement
Park Opportunity Site
Existing Trailhead
On-street trail
Existing Trail
Urban Reserve
Conservation
Park
Utilities
Public and Semi-Public
Retail Commercial
(16 -26 units/acre)*
Mixed Use Neighborhood
(16 -21 units/acre)*
High Density Residential
(3 -9 units/acre)
Low Density Residential
(0.2 -2.0 units/acre)
Very Low Density Residential
(up to 0.2 units/acre)
Open Space/Agriculture/Residential
(up to 0.1 units/acre)
Transitional Open Space/Residential
0 1/4 1/2
MILES
1 Paci ca, Southeast
Figure 4-9:
Figure 4-9: Pacifica, Southeast
11.a
Packet Pg. 284 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4LAND USE
PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT 4-27
thus, the footprint of development could be smaller
than the area designated. Future development should
include a small park and access to the berm and the
beach beyond. Completion of the Devils Slide Tunnel project has provided the opportunity to create a new trailhead and trails through open space land on
the headlands.
West Linda Mar
The West Linda Mar sub-area is in the lower portion
of the San Pedro Creek Valley and on the hillsides to
the north. The area is almost entirely developed with
single-family houses. West Linda Mar has two access
points to Highway 1, at Crespi Drive and Linda Mar
Boulevard. Linda Mar Shopping Center, Pacifica’s
largest, is at the junction of Linda Mar Boulevard
and Highway 1. Public parking for beach visitors and
commuters is provided in both areas, and served by
Samtrans buses. A variety of uses, including a hotel,
multi-family housing, service commercial and small
retail centers, Cabrillo Elementary School, the Pacifica Community Center, including Senior Services, and a
post office, are clustered along lower Crespi Drive. The Crespi Business Center is the City’s only light-industrial business park and provides a unique combination of local employment and small business opportunities for residents. A smaller commercial/office area is located at the corner of Linda Mar Boulevard and
Adobe Drive. The area includes the Sanchez Adobe,
the oldest structure in San Mateo County and a designated historic resource. Pacific Bay Christian School (formerly Alma Heights Christian Academy) is to the
east along Linda Mar Boulevard. Oddstad Park is a
large, mostly wooded park serving the area.
The General Plan reinforces existing residential land
use patterns in West Linda Mar. It proposes new
opportunities for mixed-use development along lower
Crespi Drive and at the Linda Mar Park-and-Ride site.
Redevelopment at these locations can help Pacifica
provide a greater diversity of housing types in close
proximity to transit, public amenities, and walkable
commercial areas.
The General Plan designates most of Fassler Ridge (top) as Residential/Open Space. New development at Park Mall (middle) could include a mix of retail and residential uses. Steep land in Park Pacifica (bottom) is designated either as greenbelt or for Residential/Open Space to ensure slope stability and visual quality.
11.a
Packet Pg. 285 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4-28 PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT
San Pedro Creek travels through the heart of the
neighborhood. Protection and enhancement of the
riparian stream corridor must be a continued priority. The General Plan envisions on-street trails along the former San Pedro Terrace Road and Rosita Road,
providing a good walking route through valley neighborhoods between Pacifica State Beach and San Pedro Valley County Park.
Southeastern Pacifica
Figure 4-9 shows the East Linda Mar and Park Pacifica neighborhoods in the southeastern part of the Planning Area. The map includes Park Mall, Terra
Nova High School, San Pedro Valley County Park,
Oddstad Park, and a section of Sweeney Ridge.
East Linda Mar and Park Pacifica
East Linda Mar includes the portion of the San
Pedro Valley east of Pacific Bay Christian School and
Oddstad Park, and on the southern slope of Fassler
Ridge. Park Pacifica, developed mostly in the 1970s,
lies in the “back of the valley” and the hilly terrain
rising up to Sweeney Ridge. In the north, the area
is characterized by winding residential streets and
greenbelts. The valley portion includes Sanchez Park,
the Pacifica Center for the Arts, and one of Pacifica’s two fire stations. Some housing exists south of San
Pedro Creek, along with undeveloped or agricultural
land where a limited amount of residential development may be possible. The area is served by the Park Mall shopping center on Terra Nova Boulevard, and
by the adjacent Sanchez branch library and Ortega
Elementary School.
Park Pacifica lies in a secluded valley and its slopes
extend to the northeast of Linda Mar Boulevard
along Oddstad Boulevard. As in Linda Mar, the
predominant land use is low density residential,
interspersed with greenbelts. Multi-family housing
is developed along Terra Nova and Oddstad Boulevards, including senior housing. Park Pacifica is also home to Terra Nova High School. The neighborhood is hemmed in by topography and protected open space on Sweeney Ridge and in San Pedro Valley County Park and Frontierland Park.
Existing land use patterns in Linda Mar and Park
Pacifica are reflected in the Plan. There is a considerable amount of undeveloped land within City limits on the slope of San Pedro Mountain to the south.
These parcels are designated for lower density residential development than other areas of the City, in recognition of the constraints on development posed
by steep slopes, the City’s hillside development standards, limited access, and location adjacent to Very High Fire Hazard Severity Zones located on the
periphery of Pacifica.
Park Mall is a candidate for potential new development. The Plan would facilitate a mix of retail and residential uses, including housing for seniors, and
the creation of a small new public space. Very limited
residential development potential may exist on existing parcels in agricultural use, including the large Millwood Ranch and former Park Pacifica Stables
properties. These are designated Open Space/Agriculture/Residential or Conservation to ensure that open space and biological resource protection is an
emphasis of any development on these scenic and
remote properties.
Sphere of Influence
San Pedro Mountain and Pedro Point Headlands
define the southern boundary of Pacifica’s Sphere of
Influence, which includes the undeveloped 73-acre,
986-lot Tobin Park subdivision4 located outside the
Coastal Zone. The area between the City and Sphere
of Influence boundaries includes sloping, undeveloped land and Shamrock Ranch.
The Plan designates existing public open space in the
Sphere of Influence as Park, and designates all other
land as Urban Reserve. The Urban Reserve area is
intended to remain largely undeveloped. Shamrock
Ranch represents the area’s most significant potential
future development opportunity. Any new development here should be clustered to preserve open space and maintain land that could be developed beyond
the planning period to support future growth.
4 San Mateo County Recorder’s Office, Record of Subdivision Maps, Volume 9, Page 12.
11.a
Packet Pg. 286 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4LAND USE
PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT 4-29
Table 4-2: RESIDENTIAL BUILDOUT UNDER THE GENERAL PLAN
General Plan Land Use
Permitted Density
Range (units per acre)
Projected Density
(units per acre)2
New Housing Units at
Buildout
Residential Designation
Transitional Open Space/Residential 0.1 or less 0.08 0TBD Open Space/Agriculture/ Residential 0.2 or less 0.15 40 Very Low Density Residential 0.2 to 2 1.5 10
Low Density Residential 3 to 9 6.5 80
Medium Density Residential Up to 15 12.5 60
High Density Residential Up to 21 25 60
Mixed Use Designation
Coastal Residential Mixed Use Up to 15 15 70
Mixed Use Neighborhood Up to 26 25 300
Mixed Use Center Up to 50 25 380
Urban Reserve
Urban Reserve 0.1 or less 0.1 0
Net New Residential Potential1 990
1 May not sum due to rounding
2 Projected density is informed by average current density of projected land uses and allowable density ranges.
Sources: San Mateo County Assessor’s Office, 2019; City of Pacifica, 2008; Dyett & Bhatia, 2020.
Development Capacity
One purpose of the General Plan and LCLUP is to
ensure that the City can accommodate projected
population and job growth over the planning period
(to 2040). This section estimates projected demand
for new housing and non-residential space, and the
development potential provided under the General
Plan land use framework.
Buildout
Policies in the General Plan will allow the City to
meet the needs of the future residents and workers,
including housing for a diversity of residents, parkland and public facilities, and adequate options for non-residential development to provide employment
opportunities and retail and services that respond to
the community’s daily needs.
Potential new development through the horizon year
and the corresponding growth in population and
employment is referred to as “buildout.” Buildout
is based on existing development and an estimated
amount of potential new development in the Planning Area. Buildout estimates should not be considered a prediction for growth, as the actual amount of development that will occur through 2040 is
based on many factors outside of the City’s control,
including changes in regional real estate and labor
markets and other long-term economic and demographic trends. Therefore, buildout estimates represent potentialities rather than definitive figures. To estimate buildout, assumptions were made about
the density of development in each proposed land
use designation, as well as the percentage of parcels
that would actually develop depending on location
and land use designation. The designation of a site
for a particular land use in the General Plan does
not guarantee that the site will be developed or redeveloped with that use or assumed density during the planning period, as future development will rely primarily on each property owner’s initiative.
RESIDENTIAL DEVELOPMENT
As Table 4-2 shows, buildout would result in an estimated 990 new housing units. Of these units, 12 percent would be single-family residential, and 88
percent would be multi-family residential including those within mixed-use developments. Assum11.a Packet Pg. 287 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4-30 PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT
Table 4-3: NON-RESIDENTIAL BUILDOUT UNDER THE GENERAL PLAN General Plan Land Use
Maximum NonResidential FARProjected NonResidential FAR2New Non-Residential Sq.
Ft. at Buildout
Mixed Use Designations
Coastal Residential Mixed Use 0.5 0.10 57,490
Mixed Use Neighborhood 1.0 0.25 182,890
Mixed Use Center 2.5 0.35 162,860
Commercial Designations
Retail Commercial 1.0 0.25 757,380
Office/Commercial 1.5 0.35 63,120
Service Commercial 0.6 0.25 21,000
Visitor-Serving Commercial 3.0 0.35 81,840
Rockaway Quarry Site4 0.5 0.35 448,400
Low-Intensity Visitor-Serving Commercial 0.2 0.05 40,550 Public Facilities and Open Space Designations
Public and Semi-Public 1.0 0.35 0
Total Non-Residential Development Potential
on Opportunity Sites
1,848,630
Existing Non-Residential Development on
Underutilized Sites
1,228,300
Net New Non-Residential Potential1 620,330
1 Acreages are shown rounded to the nearest whole number, but more detailed numbers are used in calculations. 2 Projected density is informed by average current density of projected land uses and allowable density ranges.
Sources: San Mateo County Assessor’s Office, 2019; City of Pacifica, 2020; Dyett & Bhatia, 2021. ing that average household size remains as it is today, new housing at buildout could accommodate population growth of about 2,720 and a total population of 41,050.
NON-RESIDENTIAL DEVELOPMENT
Table 4-3 shows the realistic non-residential development capacity in terms of square feet of new commercial buildings. Development capacity is based on the maximum intensity established for each designation by the General Plan, and is typically toward the middle of the allowable density range, pointing to
the existence of constraints on many sites. Realistic
development of opportunity sites would result in an
estimated 620,300 square feet of net new non-residential building area. New development is estimated to accommodate approximately 1,470 new jobs over
the planning period.
11.a
Packet Pg. 288 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4LAND USE
PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT 4-31
POLICIES
Policies included in both the General Plan and Local
Coastal Land Use Plan are indicated with a .
Guiding Policies
LU-G-1 Coastal Development. Ensure that
development maximizes beach and coastal
open space access and is oriented as much
as possible to each particular coastal environment in use, design, and intensity.
Policies related to coastal access are provided
in Chapter 6.
LU-G-2 Concentrated Development. Focus
new development in or directly adjacent
to already-developed areas, where it can
be served by existing public services and
where it will not have significant impacts
on coastal or other resources.
LU-G-3 Future Residential Development.
Limit development to sites that are not critical for open space connections or habitat preservation, and which will be in harmony
with the surrounding natural setting.
LU-G-4 Higher-Density Housing. Locate
higher-density housing outside of Coastal
Vulnerability Zones and in accessible
places close to community shopping areas
and transportation.
LU-G-5 Commercial Area Revitalization.
Facilitate the revitalization of shopping
areas and the creation of distinct commercial districts in Pacifica, resulting in wider shopping and dining opportunities for
residents, enhanced attractions for visitors,
increased sales tax revenues, and a stronger
community image.
LU-G-6 Compact Mixed Use Development.
Facilitate compact mixed-use development
on sites with good access to transit. Mixeduse development may include housing or office space with retail, restaurants, or personal service businesses.
LU-G-7 Open Space Conservation and Habitat Protection. Protect beaches, oceanfront bluffs, ridgelines, hillside areas adjacent to
existing open space, and areas that support
critical wildlife habitat and special status
species.
LU-G-8 Changes in Density or Intensity of
Land Use in Coastal Vulnerability Zones.
Do not increase the density or intensity
of land use designations beyond those
indicated in the LCLUP for sites located
within Coastal Vulnerability Zones.
Policies related to Natural Hazards and
Coastal Resilience are provided in Chapter 8.
LU-G-9 Citizen Participation. Continue broadbased citizen participation in the planning process.
Implementing Policies
Land Use Designations
LU-I-1 Zoning Consistency. Update the Zoning Ordinance and zoning map and apply zoning to all land within the City, consistent with General Plan and LCLUP policies and land use designations.
LU-I-2 Land Divisions in the Coastal Zone.
Continue to require coastal development permits for all land divisions within the Coastal Zone. Land divisions in the
Coastal Zone shall be:
• Designed to minimize impacts to public
access, recreation, and coastal resources.
• Designed to minimize site disturbance,
landform alteration, and the removal of
native vegetation for development or fire
safety.
• Prohibited on properties that include
any areas that are within or adjacent to
an Environmentally Sensitive Habitat
Area (ESHA) unless the resulting parcels can be developed without building
11.a
Packet Pg. 289 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4-32 PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT
or requiring vegetation clearance in the
ESHA or ESHA buffer, or unless the
resulting parcels are set aside for conservation.
• Permitted only in areas with adequate
public services to serve development on
the resulting parcels.
• Any land division that would result in
a parcel that could not be developed
in accordance with the policies of this
LCLUP is not allowed.
LU-I-3 Coastal Development Permit Findings. For all development that requires a coastal development permit, continue to
require written findings that it is consistent
with all LCLUP policies and Implementation Plan provisions of the City’s certified Local Coastal Program.
If there is a conflict between a provision of
this LCP and a provision of the General
Plan, or any other City-adopted plan, resolution, or ordinance not included in the LCP, and it is not possible for the development to
comply with both the LCP and such other
plan, resolution or ordinance, the LCP shall
take precedence and the development shall
not be approved unless it complies with the
LCP provision.
LU-I-4 Coordinate with the County to protect the Urban Reserve. Coordinate with the County to ensure that new development in unincorporated areas occurs at a maximum density of 10 acres per unit, and
request that subdivision of 50 acres or more
is subject to master planning and annexation as a condition of any urban development.
Annexation would require a General Plan
amendment, and an LCLUP amendment
would be required for land within the
Coastal Zone.
LU-I-5 Density Ranges. Ensure that development
is permitted within the allowable density
range for the applicable land use designations.
LU-I-6 Sphere of Influence Annexations. Permit
annexation of unincorporated parcels on
the condition that parcels will correspond
to the Urban Reserve designation, including a minimum lot area of 1010 acres per dwelling unit. Contiguous parcels or units
held by the same owner in the Sphere of
Influence that do not conform to the minimum parcel lor lot size shall be required to merge pursuant to Pacifica Municipal
Code Title 1010.
Coastal Development
LU-I-7 Lower Cost Visitor and Recreational
Facilities. Protect lower-cost visitor and
recreational facilities along the coastline.
These include recreational attractions such
as Pacifica Pier and Pacifica State Beach;
the public golf course at Sharp Park; the
San Francisco RV Park; and beaches accessible at no cost.
LU-I-8 Oceanfront Land for Recreational
Use. Protect land adjacent to Sharp Park
and Pacifica State Beaches for low-intensity
recreational use. Allowable uses should
include recreation outfitters, campgrounds,
rustic lodging, hikers’ huts, or view restaurants.
LU-I-9 Development Priority for VisitorServing and Recreational Uses. Allow visitor-oriented uses as-of-right in all areas
designated for Visitor-Serving Commercial
or Low-Intensity Visitor-Serving Commercial, and all commercial or mixed-use districts within the Coastal Zone.
Development on Visitor-Serving Commercial sites with developable areas of two acres or larger must include a visitor attraction,
hotel, conference center, or similar use, and
may also include a range of retail and service
11.a
Packet Pg. 290 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4LAND USE
PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT 4-33
uses. Smaller sites may have any visitor- or
pedestrian-oriented retail or service use.
LU-I-10 Walkable and Transit-Oriented
Development. Facilitate higher-density,
mixed use development at specific locations
along the coastline where an active, pedestrian environment is desired.
Future development along Palmetto Avenue
and at the Eureka Square site; on lower
Linda Mar Boulevard and Crespi Drive
in West Linda Mar; at the Pacific Manor
Shopping Center; and at Rockaway Beach
and Quarry are easily accessible along the
Highway 1 corridor and transit routes. Such
development should help to make the coastline more accessible to residents and visitors.
LU-I-11 Coastal-Dependent Industry. Only
allow new coastal-dependent industry if
alternative locations outside the Coastal
Zone are infeasible or more environmentally damaging or because to do otherwise would adversely affect the public welfare,
and potential impacts to visual resources,
sensitive species and habitat, water quality are mitigated to the maximum extent feasible.
Future development of oil and gas facilities,
refineries or petrochemical facilities, or thermal electric generating plants will be permitted only according to the terms established in Sections 30262, 30263, and 30264 of the
Coastal Act, and Conditions of Approval that
will ensure consistency with all Coastal Act
policies.
LU-I-12 Aquaculture. If oceanfront land is
found to be suitable for coastal-dependent
aquaculture, give such use priority over
non-coastal-dependent uses.
Major stretches of the Pacifica coastline along Sharp Park and Pacifica State Beaches are protected as open space, and accessible for recreational use (top). The General Plan facilitates mixed use development at specific locations along the coastline where an active environment is desired, including Palmetto Avenue (middle). The Hillside Preservation District helps to ensure careful site planning on steep terrain (bottom).
11.a
Packet Pg. 291 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4-34 PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT
LU-I-13 Public Service Priorities. Ensure that
existing and planned public works facilities
accommodate needs generated by development or uses permitted over the planning period.
In the event that existing or planned public works facilities can accommodate only a limited amount of new development, services
to coastal dependent land use, essential public
services and basic industries vital to the economic health of the region, state, or nation, public recreation, commercial recreation, and
visitor-serving land uses shall not be precluded by other development.
Land Use Strategies to Protect Natural and
Scenic Resources
LU-I-14 Hillside Preservation. Update the
Hillside Preservation District and the zoning map to ensure that all steep and sensitive terrain is subject to these regulations.
The Hillside Preservation map (Figure 4-4)
should be used as a guide.
LU-I-15 Transfer of Development Rights.
Amend the Transfer of Development
Rights (TDR) program to reflect the following changes:
• Use the City’s TDR ordinance to relocate development rights from Coastal Vulnerability zones and other hazardous
areas (sending sites) to receiving sites
out-side of Coastal Vulnerability zones
or other hazardous areas. Identify areas
where densities and heights may be
increased using TDR credits, including
to facilitate affordable housing.
• Apply receiving status to sites designated
for mixed use development in addition
to the residential land use categories.
The TDR Program provides a mechanism
to relocate potential development from areas
where environmental or land use impacts
could be severe to other areas more appropriate for development.
Land Use Programs to Facilitate Housing
LU-I-16 Density Bonus. Continue to facilitate
housing affordable to moderate-, low- and
extremely-low-income households by providing a density bonus of up to 50 percent over the maximum allowed by zoning.
Specific density bonus provisions in the zoning ordinance should be adjusted as needed to support housing types that are most needed
based on regional housing needs allocations or
local goals.
LU-I-17 Accessory Dwelling Units. Maintain the
Zoning Ordinance to ensure that regulations governing accessory dwelling units conform with current State requirements.
Accessory dwelling units are an important
component of the City’s strategy to provide
housing for moderate- and low-income
households.
LU-I-18 Parking Requirements. Update commercial and mixed use parking requirements as appropriate based on best practices. Provide for shared parking between commercial uses; car-sharing availability
for residential uses, reductions for transitaccessible locations, and other strategies.
LU-I-19 Height Limit. Replace a single citywide
height limit with height limits that vary
by neighborhood, topography, or other relevant factors, based on community input.
These may allow greater heights for buildings in the Mixed Use Center and VisitorServing Commercial designations.
Policies for Specific Sites
LU-I-20 Northern Coastal Bluffs. Maintain
the Planned Development zoning district
for the private, developable land on the
northern coastal bluffs to allow for the
consideration of development standards
11.a
Packet Pg. 292 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4LAND USE
PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT 4-35
that consider the potential environmental
and scenic resources on the site.
Allowable density should be consistent with
the Open Space/Residential/Agriculture designation. Where coastal bluff scrub vegetation is present, further analysis will be required
prior to any development. Work with public
agencies and others to facilitate permanent
conservation of scenic resources in this area.
LU-I-21 Bowl Site. Establish appropriate zoning for the “Bowl” site along the east side of Palmetto Avenue in Fairmont West for
Planned Development to ensure site planning that clusters development, avoiding potential flooding or geotechnical hazards
and protecting open space resources.
Allowable density should be consistent with
the Medium Density Residential designation.
LU-I-22 Pacific Manor. Establish appropriate
zoning for the Pacific Manor shopping district to facilitate Retail Commercial improvements and Mixed Use redevelopment.
Redevelopment or improvements should
enhance the area’s walkability and visual
appeal, and should include pedestrian realm
improvements that help to integrate the district with its coastal setting.
LU-I-23 Esplanade. Establish appropriate zoning for privately-owned, undeveloped land on the west side of Esplanade Avenue to
ensure minimal development consistent
with the General Plan designation New
development shall preserve the view corridor to the ocean along Bill Drake Way and shall be sited and designed to ensure that
any proposed development could withstand erosion resulting from a 100-year seismic or storm event and in accordance
with LCLUP Policy CR-I-44 and preserve
the view corridor to the ocean along Bill
Drake Way.
Redevelopment or improvements of Pacific Manor Shopping Center (top) should enhance the area’s visual appeal and integrate the district with its coastal setting. Redevelopment of the city-owned 2212 Beach Boulevard property (middle) should provide an anchor for Palmetto Avenue and enhance the beachfront experience. The Quarry site (bottom) could support hotels and other visitor-serving uses and complement the natural setting. Any development of the Quarry site must ensure that sensitive habitat is protected.
11.a
Packet Pg. 293 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4-36 PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT
likely footprint of development could be much
smaller than the area designated.
LU-I-26 Rockaway Beach. Facilitate continued improvements in the Rockaway Beach district and promote infill development
emphasizing active ground-floor and visitor-oriented uses and links to the Quarry site.
LU-I-27 Rockaway Headlands. Facilitate very
low-intensity visitor-serving commercial
use on the Headlands between Rockaway
Beach and Pacifica State Beach. Maintain the Coastal Trail connecting the two beaches. Any use on this site must recognize the limited opportunity for vehicular access.
Potential uses should have a low development
impact and able to be readily relocated to
adapt to evolving coastal conditions, such as
rustic lodging, hikers’ huts, or similar uses.
LU-I-28 Pedro Point Shopping Center. Facilitate improvements to the existing Shopping Center that result in an improved orientation to the coastal environment
and that result in more efficient use of the
property with regards to parking, while
enhancing its appeal for both neighborhood residents and visitors. Maintain beach access along Shoreside Drive.
LU-I-29 Undeveloped San Pedro Avenue Site.
Establish a Coastal Residential Mixed Use
zoning district to allow small-scale visitororiented commercial uses as a stand-alone project without any residential development, or small-scale visitor-oriented commercial uses with residential development at a density range of three to five units per
gross acre. Housing may be clustered, and
uses may be mixed vertically or horizontally. Residential uses may be constructed attached to or detached from commercial
uses, provided the overall site contains
both commercial and residential uses.
LU-I-24 Northern Palmetto. Support the
transition to low-intensity visitor-serving
commercial uses over time along the west
side of Palmetto Avenue in northern West
Sharp Park, and require improvement of
the visual appearance of permitted older
industrial uses when improvements are
proposed to these uses.
Geotechnical studies are required to determine the “net developable area.” New uses are required to provide appropriate setbacks along the coastal bluffs to protect new structures from loss during their design life,
and to provide public access to and along the
shoreline.
LU-I-25 Rockaway Quarry Site. Enable the
responsible development and environmental conservation of the Quarry Site.
Preparation of a specific plan for the Quarry
site could achieve the desired development
outcomes. Allowable development should
provide City revenues, substantial public
open space, and commercial uses and public
spaces attractive to both visitors and local
residents. Uses may include an inn or hotel;
shops and restaurants; performance or conference spaces; and public uses. Ordinance No. 391 provides that residential uses are
only authorized after a vote of the electorate. Development should be integrated with the Rockaway Beach district, to create an
expanded visitor-oriented area in a memorable natural setting.
Environmental protection is a priority at this
site and includes preserving upland areas as
open space, preserving the riparian corridor
along Calera Creek, and preserving critical
habitat. Any development of the Quarry site
will require detailed evaluation of potential
geotechnical hazards and biological resources
to ensure safe use of the site and that sensitive habitat and wetlands are protected; the
11.a
Packet Pg. 294 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4LAND USE
PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT 4-37
Development must include public coastal
access and must provide public open space.
A wetland survey conducted according to the
requirements of Coastal Commission regulation 13577 (Title 14, California Code of Regulations) is required to delineate potential
wetlands on the site as part of the development application and environmental review process. An assessment of potential geotechnical hazards must also be part of the development application and environmental review process, including assessment of the Ocean
Shore railroad berm under hazard and vulnerability scenarios consistent with policies in Chapters 7 and 8.
LU-I-30 Pedro Point Upper Slopes. Maintain
zoning for the upper slopes of Pedro Point
to ensure that any new development is at a
density appropriate to the steep slopes.
If any portion of the property is designated as
official habitat for California red-legged frog,
a biological resources survey must be conducted and development will be required to avoid habitat areas.
LU-I-31 Upper Monterey Road. Extend the Hillside Preservation District zoning to steep sites along upper Monterey Road and limit
new development to a density that is consistent with the Residential/Open Space/ Agriculture designation.
LU-I-32 Milagra Canyon. Ensure that land along
Milagra Canyon south of Manor Drive
occurs at a density consistent with the
Open Space/Agriculture/Residential designation, is clustered to minimize environmental impacts, and resulting open space is permanently preserved.
LU-I-33 Eureka Square. Facilitate high-quality
redevelopment for the Eureka Square
Shopping Center using policies in the
Sharp Park Specific Plan.
The site’s position along Highway 1, beneath
a ridge and backed by multi-family housing
make it well-suited for higher-intensity development, which would also reinforce the area as Pacifica’s center. A small plaza should be
included as part of redevelopment.
LU-I-34 Gypsy Hill. Require sensitive site planning
in accordance with the Hillside Preservation District for up-per portions of Gypsy Hill.
Clustered development can preserve open
space and maintain the area’s function as a
wildlife movement corridor.
LU-I-35 East Fairway Park Hillside. Ensure consistency with the Open Space/Agriculture/ Residential designation on the slope above
Fairway Park to ensure that any new development occurs at a very low density and meets standards of the Hillside Preservation District.
LU-I-36 Cattle Hill and Fassler Ridge. Ensure consistency with the Open Space/Agriculture/ Residential land use designation on Cattle
Hill and Fassler Ridge, as shown on the
General Plan Land Use diagram, to ensure
that new development is appropriate to the
physical conditions and high scenic value
of the ridge.
Certain locations are designated for Low
Density Residential development; site planning in these areas should be subject to the Hillside Preservation District to provide
clustered development. The Royce water tank
site will retain a Utilities designation. Trail
easements should be negotiated with land
owners based on the Parks and Open Space
map (Figure 6-1).
11.a
Packet Pg. 295 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4-38 PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT
LU-I-37 Lower Cattle Hill. Any project proposed
on Lower Cattle Hill should perform
detailed transportation impact studies and
implement measures to minimize impacts
to vehicular traffic flow on Highway 1, and
to ensure maximum alternatives to singleoccupant vehicle trips, including but not limited to establishing on-site transit services and providing a pedestrian overcrossing to the west side of Highway 1.
LU-I-38 Lower Crespi Drive. Establish zoning
provisions to facilitate compact, mixed-use
redevelopment of older commercial and
residential properties along lower Crespi
Drive, consistent with the Mixed Use Center and Mixed Use Neighborhood designations.
Redevelopment adjacent to the Community
Center, Skate Park, and Pacifica State Beach
should provide a core for the southern portion of the City, a greater diversity of housing types, and a walkable commercial area appealing to both locals and visitors.
LU-I-39 Crespi Business Center. Protect existing
land uses at the Crespi Business Center to
support local employment and small business opportunities for residents. Ensure zoning allows the continuation of lightindustrial and research and development uses that would not generate significant
noise and odors, or use significant quantities of hazardous materials, that may be incompatible with mixed-use residential
development on the site or nearby sites.
LU-I-40 Linda Mar Shopping Center and Parkand-Ride. Allow redevelopment of the Linda Mar Shopping Center with additional commercial development along the Linda Mar Boulevard frontage. Rezone the
north side of Linda Mar Boulevard to facilitate mixed-use development, while also accommodating the existing park-and-ride
The General Plan allows higher-intensity mixed use redevelopment, as in the example at top, at Eureka Square (middle), and redevelopment along lower Crespi Drive should provide a walkable commercial area appealing to both locals and visitors (bottom).
11.a
Packet Pg. 296 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 4LAND USE
PACIFICA GENERAL PLAN PUBLIC REVIEW DRAFT 4-39
use, and improving the pedestrian-transit
interface.
LU-I-41 Linda Mar and Park Pacifica Hillsides.
Rezone steep land in the Linda Mar and
Park Pacifica hillsides consistent with the
Open Space/Agriculture/Residential land
use designation to be subject to the Hill-
side Preservation District.
LU-I-42 Park Mall Area. Facilitate mixed-use rede-
velopment at the Park Mall and Sanchez
Library sites and adjacent vacant land, with
retail uses concentrated along Oddstad and
Terra Nova Boulevards.
Upper story housing over retail may be pro-
vided, along with attached, multi-family
housing, and senior housing. Redevelopment
should include a small public open space and
public viewing areas at San Pedro Creek.
LU-I-43 Former Park Pacifica Stables. Ensure
development of the former Park Pacifica
Stables is consistent with the Open Space/
Agriculture/Residential land use designa-
tion , to provide opportunities related to
Pacifica’s natural setting, including con-
tinuing equestrian use, or open space and
minimal residential development.
LU-I-44 Shamrock Ranch. Coordinate with San
Mateo County to ensure that any new
development at Shamrock Ranch is clus-
tered to preserve open space.
Shamrock Ranch is the largest parcel in the
sphere of influence outside of City limits. Any
subdivision of greater than ten lots or develop-
ment of more than ten housing units or 40,000
square feet of non-residential space should
occur through a master planning process and
may involve annexation into the city. Such
subdivision and/or development may result in
a new neighborhood, employment area and/
or open spaces for Pacifica, and will require an
amendment to the General Plan.
11.a
Packet Pg. 297 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 298 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) APPENDICES | STORM DRAINAGE SYSTEM MASTER PLAN | CITY OF PACIFICA Appendix C
KNOWN DEVELOPMENTS
FINAL DRAFT | NOVEMBER 2022
11.a
Packet Pg. 299 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 300 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) From: Murdock, Christian <[email protected]>
Sent: Friday, March 25, 2022 11:23 AM
To: Ryan Orgill <[email protected]>
Cc: Paul Friedlander <[email protected]>
Subject: RE: Pacifica SDMP Planning Meeting Follow Up
Hi Ryan,
Due to staff vacations at our consultant, I’m still waiting on the General Plan proposed land use designations GIS data. Should have those to you early next week.
Attached, please find a KMZ file that I hope you can import to replicate our Active Planning Applications map. Among those applications currently being processed and on the map, the following would be considered significant for stormwater drainage purposes in my mind:
1) 4000 Palmetto Ave: This project would be located in an area of town subject to coastal erosion that could impact the storm drain infrastructure. Plus, I’m not aware that a formal collection system exists in the immediate vicinity and would possibly need to be designed and constructed for the project if approved. 2) 200-224 Palmetto Ave: Not a major project or a new project, but it’s with Coastal Commission currently and they’re considering requiring the project to reroute sewer flows aware from a bluff face outfall into Palmetto Avenue on the inland portion of the site. As noted immediately above, I’m unsure the formality of any existing storm drain system in this segment of Palmetto Avenue and what its capacity may be to take these flows.
3) 699 Oceana Blvd: Would build a hotel and parking lot covering a high proportion of the site, much greater than the existing impervious surface on the site.
4) 701 Oceana Blvd: Two hotels or potentially one hotel with some residential development on a relatively steep, undeveloped site.
5) 1567 Beach Blvd (NOT ON LIST): City has plans to redevelop the site possibly with a hotel and parking structure. Site is largely pervious currently but likely would have significant impervious surface following redevelopment. Located close to ocean but existing outfalls may/may not be suitable near pier or Clarendon Road (which I understand has its own issues). 6) All projects draining to Clarendon Road outfall (NOT ON LIST): As noted above, seems existing Clarendon Road outfall has issues and so it would be helpful to understand what impact that may have on the higher intensity development contemplated in the Sharp Park Specific Plan. 7) Quarry Reclamation: This project does not include development, but is a prerequisite to potential future redevelopment. The City also intends to prepare a Quarry Specific Plan in the next couple years. Calera Creek seems readily available for storm drainage but listing the potential development of the Quarry as an issue to be considered.
8) Oddstad Way Lots 4-12; 10, 11, & 14 Oddstad Way; Bayview Road-Calera Terrace; 501 Santa Cruz Terrace:
These projects are all located in the Rockaway Beach neighborhood which has no formal stormwater drainage system to speak of (to my knowledge). Streams of water often flow downhill on the streets and flooding can be prevalent. Rockaway Creek (or Calera Creek, different names are used) drains the neighborhood but these new projects have the potential to exacerbate an already challenging situation in the neighborhood. Dozens of potential development sites exist on paper streets off Oddstad Way and Santa Cruz Terrace that could be developed and probably should be planned for in your SDMP. 9) All of the projects in Pedro Point neighborhood (street names San Pedro Ave, Olympian Way, Danmann Ave, Kent Rd, Sterling Ave, Blackburn Terrace, Grand Ave): This neighborhood does not have a formal storm drain system to speak of and the neighborhood is largely drained through a single culvert and ditch in the vicinity of 505 San Pedro Avenue (undeveloped property, APN 023-072-010). Getting a better handle on how to address storm drainage in this neighborhood as infill lots continue to be developed and existing development redevelops would be helpful. Some neighbors report significant uncontrolled hillside drainage east of the developed properties in the 1500-block of Grand Avenue for example (can provide videos or pictures possibly of past incidents).
11.a
Packet Pg. 301 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) 10) Linda Mar Woods: Large hillside development proposed on undeveloped parcels with limited downslope existing storm drain infrastructure to handle new flows. May also eventually drain through the problematic Linda Mar outfall.
I think that’s the best summary I can provide for now. Happy to hop on a call if you need any clarifications of what I’m trying to describe.
Regards,
Christian
CHRISTIAN MURDOCK, AICP
DEPUTY DIRECTOR OF PLANNING
CITY OF PACIFICA | PLANNING DEPARTMENT
540 Crespi Drive, Pacifica, CA 94044
Phone: (650) 738-7341 | [email protected]
From: Ryan Orgill <[email protected]>
Sent: Thursday, March 24, 2022 2:50 PM
To: Murdock, Christian <[email protected]>
Cc: Paul Friedlander <[email protected]>
Subject: Pacifica SDMP Planning Meeting Follow Up
[CAUTION: External Email]
Hi Christian,
I wanted to follow up on our discussion a few weeks ago. Would you be able to provide a marked up map showing which of the planned developments on the City’s website you would consider to be significant? Thanks again for all your help with the project!
Ryan Orgill, PE
Principal Planning Engineer | Associate Vice President
100 West Liberty Street, Suite 740 | Reno, NV 89501
O 775.332.8722 | C 559.284.5451
[email protected] | carollo.com
CAUTION: This email originated from outside of the City of Pacifica. Unless you recognize the sender's email address and know the content is safe, do not click links, open attachments or reply.
11.a
Packet Pg. 302 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) APPENDICES | STORM DRAINAGE SYSTEM MASTER PLAN | CITY OF PACIFICA Appendix D
FLOW MONITORING REPORT
FINAL DRAFT | NOVEMBER 2022
11.a
Packet Pg. 303 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 304 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) City of Pacifica
Storm Drain Master Plan Flow Monitoring
Prepared for: Carollo
100 West Liberty Street
Suite 740
Reno, NV 89501
Report Date: April 2022
Prepared by:
V&A Project No. 21-0090
11.a
Packet Pg. 305 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) In the promotion of environmental consciousness, this document is designed to be printed double-sided, if at all. V&A strives to do all it can to be a green company. Think twice before printing. Reduce. Reuse. Recycle.
11.a
Packet Pg. 306 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Table of Contents
21-0090 | City of Pacifica | 2021 Flow Monitoring | i
Table of Contents
Executive Summary ................................................................................................................................. 1 Scope and Purpose ........................................................................................................................... 1 Monitoring Sites and Basins.............................................................................................................. 1 Rainfall Monitoring............................................................................................................................ 3 Pipeline Capacity Analysis ................................................................................................................. 4 1 Introduction ...................................................................................................................................... 5
1.1 Scope and Purpose............................................................................................................... 5 2 Methods and Procedures .................................................................................................................. 7
2.1 Confined Space Entry ........................................................................................................... 7
2.2 Flow Meter Installation ......................................................................................................... 8
2.3 Flow Calculation ................................................................................................................... 9 3 Results and Analysis .......................................................................................................................10
3.1 Rainfall ...............................................................................................................................10 Regional Rainfall Event Classification ....................................................................13 Rain Gauge Triangulation Distribution....................................................................18
3.2 Flow Monitoring Data..........................................................................................................20 Appendix A Flow Monitoring Sites: Data, Graphs, and Information ....................................................... A-1 Tables
Table ES-1. List of Flow Monitoring Sites .................................................................................................................. 1 Table ES-2. Capacity Analysis Summary .................................................................................................................... 4 Table 1-1. List of Flow Monitoring Sites ..................................................................................................................... 5 Table 3-1. Summary of Rainfall ................................................................................................................................17 Table 3-2. Rain Gauge Distribution per Monitoring Site..........................................................................................19 Table 3-3. Capacity Analysis Summary.....................................................................................................................20
11.a
Packet Pg. 307 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Table of Contents
21-0090 | City of Pacifica | 2021 Flow Monitoring | ii
Figures
Figure ES-1. Map of Flow Monitoring and Rain Gauge Sites and Basins– Overall.................................................. 2 Figure ES-2. Rainfall Over Monitoring Period, Average of All Rain Gauges .............................................................. 3 Figure 1-1. Map of Flow Monitoring and Rain Gauge Sites and Basins ................................................................... 6 Figure 2-1. Typical Installation for Hach 904 Flow Meter with Submerged Sensor ................................................ 8 Figure 3-1. Map of Rain Gauge Locations................................................................................................................10 Figure 3-2. Rainfall during Flow Monitoring Period – Average of North and Central Rain Gauges ......................11 Figure 3-3. Rainfall during Flow Monitoring Period – Average of South Rain Gauges ..........................................11 Figure 3-4. Rainfall Accumulation Plot - triangulated to Pacifica City Hall ............................................................12 Figure 3-5. NOAA Southern California Rainfall Frequency Map..............................................................................13 Figure 3-6. Rainfall Event Classification – Rain Gauge North................................................................................14 Figure 3-7. Rainfall Event Classification – Rain Gauge Central..............................................................................14 Figure 3-8. Rainfall Event Classification – Rain Gauge Central East .....................................................................15 Figure 3-9. Rainfall Event Classification – Rain Gauge South................................................................................15 Figure 3-10. Rainfall Event Classification – Rain Gauge Southwest......................................................................16 Figure 3-11. Rainfall Event Classification – Rain Gauge Southeast ......................................................................16 Figure 3-12. Rainfall Inverse Distance Weighting Method......................................................................................18 Photo Log
Photo 2-1. Confined Space Entry ............................................................................................................. 7 Photo 2-2. Typical Personal Four-Gas Monitor......................................................................................... 7
11.a
Packet Pg. 308 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Table of Contents
21-0090 | City of Pacifica | 2021 Flow Monitoring | iii Abbreviations and Acronyms
Abbreviations/Acronyms Definition
ADWF ........................................Average Dry Weather Flow AVG. ..........................................Average
CCTV .........................................Closed-Circuit Television CDEC .........................................California Data Exchange Center CIP ............................................Capital Improvement Plan CO .............................................Carbon Monoxide CWOP ........................................Citizen Weather Observing Program DIA. ...........................................Diameter d/D............................................Depth/Diameter Ratio FT. .............................................Feet
FM.............................................Flow Monitor GPD...........................................Gallons per Day GPM ..........................................Gallons per Minute GWI ...........................................Groundwater Infiltration H2S ...........................................Hydrogen Sulfide IN. .............................................Inch
I/I ..............................................Inflow and Infiltration IDM ...........................................Inch-Diameter Mile IDW ...........................................Inverse Distance Weighting LEL ............................................Lower Explosive Limit MAX...........................................Maximum
MGD..........................................Million Gallons per Day MIN. ..........................................Minimum
NOAA .........................................National Oceanic and Atmospheric Administration N/A ...........................................Not applicable PF..............................................Peaking Factor PWS ..........................................Private Weather Station Q ...............................................Flow Rate RDI ............................................Rainfall-Dependent Infiltration RG.............................................Rain Gauge V&A ...........................................V&A Consulting Engineers, Inc.
WEF...........................................Water Environment Federation WRCC ........................................Western Regional Climate Center
11.a
Packet Pg. 309 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Table of Contents
21-0090 | City of Pacifica | 2021 Flow Monitoring | iv
Terms and Definitions
Term Definition
Average dry
weather flow
(ADWF)
The average flow rate or pattern from days without noticeable inflow or infiltration response.
ADWF usage patterns for weekdays and weekends differ and must be computed separately.
ADWF is expressed as a numeric average and may include the influence of normal groundwater infiltration (not related to a rain event).
Basin Sanitary sewer collection system upstream of a given location (often a flow meter), including all pipelines, inlets, and appurtenances. Also refers to the ground surface area near and enclosed by pipelines. A basin may refer to the entire collection system upstream from a flow meter or exclude separately monitored basins upstream.
Depth/diameter
(d/D) ratio
Depth of water in a pipe as a fraction of the pipe’s diameter. A measure of the fullness of the pipe used in the capacity analysis.
Infiltration and
inflow
Infiltration and inflow (I/I) rates are calculated by subtracting the ADWF flow curve from the instantaneous flow measurements taken during and after a storm event. Flow in excess of the baseline consists of inflow, rainfall-responsive infiltration, and rainfall-dependent infiltration. Total I/I is the total sum in gallons of additional flow attributable to a storm event.
Infiltration,
groundwater
Groundwater infiltration (GWI) is groundwater that enters the collection system through pipe defects. GWI depends on the depth of the groundwater table above the pipelines as well as the percentage of the system that is submerged. The variation of groundwater levels and subsequent groundwater infiltration rates are seasonal by nature. On a day-to-day basis, groundwater infiltration rates are relatively steady and will not fluctuate greatly.
Infiltration,
rainfalldependent
Rainfall-dependent infiltration (RDI) is similar to groundwater infiltration but occurs as a result of storm water. The storm water percolates into the soil, submerges more of the pipe system, and enters through pipe defects. RDI is the slowest component of storm-related infiltration and inflow, beginning gradually and often lasting 24 hours or longer. The response time depends on the soil permeability and saturation levels.
Inflow Inflow is defined as water discharged into the sewer system, including private sewer laterals, from direct connections such as downspouts, yard, and area drains, holes in manhole covers, cross-connections from storm drains, or catch basins. Inflow creates a peak flow problem in the sewer system and often dictates the required capacity of downstream pipes and transport facilities to carry these peak instantaneous flows. Overflows are often attributable to high inflow rates.
Peak Wet
Weather Flow
The highest daily flow during and immediately after a significant storm event. Includes sanitary flow, infiltration, and inflow.
Peaking factor
(PF)
PF is the ratio of peak measured flow to average dry weather flow. This ratio expresses the degree of fluctuation in flow rate over the monitoring period and is used in the capacity analysis.
Surcharge When the flow level is higher than the crown of the pipe, then the pipeline is said to be in a surcharged condition. The pipeline is surcharged when the d/D ratio is greater than 1.0.
11.a
Packet Pg. 310 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Executive Summary
21-0090 | City of Pacifica | 2021 Flow Monitoring | 1
Executive Summary
Scope and Purpose
V&A Consulting Engineers (V&A) has completed storm drain flow monitoring and rainfall monitoring within the City of Pacifica (City) storm water collection system. Flow and rainfall monitoring were performed over a period of over four (4) weeks from December 10, 2021, to January 11, 2022. Five (5) manholes were monitored using open channel flow meters.
Monitoring Sites and Basins
The flow monitoring site locations were selected and approved by the City and Carollo and are listed in Table ES-1. Figure ES-1 shows the monitoring sites and corresponding isolated basins along with rain gauges selected for this project.
Table ES-1. List of Flow Monitoring Sites
Monitoring Site Monitored Pipe
Pipe
Location
Diameter (in)
Site 1 Northeast Inlet 42.5 Hwy 1 & Monterey Rd
Site 2 West Outlet 45.5 Edgemar Ave, south of Arroyo Dr Site 3 Northwest Inlet 47.75 Francisco Blvd
Site 4 East Inlet 59.5 Behind houses off Anza Dr. Access from Northeast
Site 5 East Inlet 36 h x 48 w box Desolo Dr between Arguello Blvd. & Linda Mar Blvd.
11.a
Packet Pg. 311 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Executive Summary
21-0090 | City of Pacifica | 2021 Flow Monitoring | 2
Figure ES-1. Map of Flow Monitoring and Rain Gauge Sites and Basins– Overall
11.a
Packet Pg. 312 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Executive Summary
21-0090 | City of Pacifica | 2021 Flow Monitoring | 3
Rainfall Monitoring
Within the City, there were approximately 10.3 inches of rainfall during the flow monitoring study, as shown in Figure ES-2. The cumulative precipitation was approximately 47% higher than historical averages over the flow monitoring period.
Figure ES-2. Rainfall Over Monitoring Period, Average of All Rain Gauges There were two classifiable rainfall events during the flow monitoring period:
▪ Event 1 (December 12 – 17, 2021) – Peak intensity was 26-year, 4-day event at the South rain gauge.
▪ Event 2 (December 21 – 30, 2021) – Peak intensity was 3-year, 8 hour and 2-year, 9-day event at the South rain gauge.
0.00 0.20
0.40 0.60
0.80 1.00
1.20 1.40
6-Dec7-Dec8-Dec9-Dec
10-Dec11-Dec12-Dec13-Dec14-Dec15-Dec16-Dec17-Dec18-Dec19-Dec20-Dec21-Dec22-Dec23-Dec24-Dec25-Dec26-Dec27-Dec28-Dec29-Dec30-Dec31-Dec 1-Jan2-Jan3-Jan4-Jan5-Jan6-Jan7-Jan8-Jan9-Jan
10-Jan11-Jan12-Jan13-Jan
Rain (inches per hour)
Total Rainfall over Period: 10.3 inches
Event 2: 5.1 inches
Event 1: 5.1 inches
11.a
Packet Pg. 313 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Executive Summary
21-0090 | City of Pacifica | 2021 Flow Monitoring | 4
Pipeline Capacity Analysis
Table ES-2 summarizes the peak recorded flows, levels, and water depth/structure height (d/H) ratios per site during the flow monitoring period. Note that capacity analysis data is presented on a site-by-site basis and represents the hydraulic conditions only at the point site location. Hydraulic conditions in other areas of the collection system will differ. The totalized flow is defined as the total flow that passed through the monitoring site from December 10, 2021, to January 11, 2022.
Table ES-2. Capacity Analysis Summary
Site
Name
Peak
Level (in)
Diameter/
Height (in) d/H
Peak
Measured
Flow (mgd)
Totalized Flow
(gallons)
Site 1 5.28 42.50 0.12 6.64 15,165,000
Site 2 15.10 49.00 0.31 39.75 74,783,000
Site 3 10.32 47.75 0.22 10.83 21,564,000
Site 4 100.71 62.00 1.72 27.10 25,253,000
Site 5 40.13 36.00 1.11 26.46 40,368,000
11.a
Packet Pg. 314 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Introduction
21-0090 | City of Pacifica | 2021 Flow Monitoring | 5
1 Introduction
1.1 Scope and Purpose
V&A Consulting Engineers (V&A) has completed storm drain flow monitoring and rainfall monitoring within the City of Pacifica (City) storm water collection system. Flow and rainfall monitoring were performed over a period of over four (4) weeks from December 10, 2021, to January 11, 2022. Five (5) manholes were monitored using open channel flow meters.
The main purpose of this study was to collect storm water flow data to support the City’s Storm Drain Master Plan. The flow and rainfall monitoring locations are listed in Table 1-1 and shown in Figure 1-1.
Map of Flow Monitoring and Rain Gauge Sites and Basins
Table 1-1. List of Flow Monitoring Sites
Monitoring Site Monitored Pipe
Pipe
Location
Diameter (in)
Site 1 Northeast Inlet 42.5 Hwy 1 & Monterey Rd
Site 2 West Outlet 49 Edgemar Ave, south of Arroyo Dr
Site 3 Northwest Inlet 47.75 Francisco Blvd
Site 4 East Inlet 62 Behind houses off Anza Dr. Access
from Northeast
Site 5 East Inlet 36 h x 48 w box Desolo Dr between Arguello & Linda Mar
11.a
Packet Pg. 315 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Introduction
21-0090 | City of Pacifica | 2021 Flow Monitoring | 6
Figure 1-1. Map of Flow Monitoring and Rain Gauge Sites and Basins
11.a
Packet Pg. 316 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Methods and Procedures
21-0090 | City of Pacifica | 2021 Flow Monitoring |7
2 Methods and Procedures
2.1 Confined Space Entry
A confined space (Photo 2-1) is defined as any space that is large enough and so configured that a person can bodily enter and perform assigned work, has limited or restricted means for entry or exit and is not designed for continuous employee occupancy. In general, the atmosphere must be constantly monitored for sufficient levels of oxygen (19.5% to 23.5%), and the presence of hydrogen sulfide (H2S) gas, carbon monoxide (CO) gas, and lower explosive limit (LEL) levels. A typical confined space entry crew has members with OSHA-defined responsibilities of Entrant, Attendant, and Supervisor. The Entrant is the individual performing the work. He or she is equipped with the necessary personal protective equipment needed to perform the job safely, including a personal four-gas monitor (Photo 2-2). If it is not possible to maintain line-of-sight with the Entrant, then more Entrants are required until line-of-sight can be maintained. The Attendant is responsible for maintaining contact with the Entrants to monitor the atmosphere using another four-gas monitor and maintaining records of all Entrants if there is more than one. The Supervisor is responsible for developing the safe work plan for the job at hand prior to entering.
Photo 2-1. Confined Space Entry Photo 2-2. Typical Personal Four-Gas Monitor
11.a
Packet Pg. 317 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Methods and Procedures
21-0090 | City of Pacifica | 2021 Flow Monitoring |8
2.2 Flow Meter Installation
V&A installed five (5) Hach FL904 flow meters for temporary monitoring within the collection system. This type of meter uses submerged sensors with a pressure transducer to collect depth readings and an ultrasonic Doppler sensor to determine the average fluid velocity. The ultrasonic sensor emits high - frequency sound waves, which are reflected by air bubbles and suspended parti cles in the flow. The sensor receives the reflected signal and determines the Doppler frequency shift, which indicates the estimated average flow velocity. The sensor is typically mounted at a manhole inlet to take advantage of smoother upstream flow conditions. The sensor may be offset to one side to lessen the chances of fouling and sedimentation where these problems are expected to occur. Manual level and velocity measurements were taken during the installation of the flow meters and again when they were removed and compared to simultaneous level and velocity readings from the flow meters to ensure proper calibration and accuracy. Figure 2-1 shows a typical installation for a flow meter with a submerged sensor.
Figure 2-1. Typical Installation for Hach 904 Flow Meter with Submerged Sensor
11.a
Packet Pg. 318 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Methods and Procedures
21-0090 | City of Pacifica | 2021 Flow Monitoring |9
2.3 Flow Calculation
Data retrieved from the flow meters were placed into a spreadsheet program for analysis. Data analysis includes data comparison to field calibration measurements, as well as necessary geometric adjustments as required for sediment (sediment reduces the pipe’s wetted cross-sectional area available to carry flow).
Area-velocity flow metering uses the continuity equation, ( ) Q v A v AT− AS= =
where Q: volume flow rate
v: average velocity as determined by the ultrasonic sensor A: cross-sectional area available to carry the flow
AT: total cross-sectional area with both wastewater and sediment AS: cross-sectional area of sediment.
For a circular pipe,
−
− −
= −
− −
D
D d
d
D
D
D d
A
W
W
W
T
2 sin cos 1
2 2
2 cos 1
4 1 1
2
−
− −
= −
− −
D
D d
d
D
D
D d
A
S
S
S
S
2 sin cos 1
2 2
2 cos 1
4 1 1
2 where dW: distance between wastewater level and pipe invert dS: depth of sediment
D: pipe diameter
11.a
Packet Pg. 319 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |10
3 Results and Analysis
3.1 Rainfall
V&A captured rainfall data from six (6) publicly available private weather stations (PWS1), allowing for good coverage over the flow monitoring area. Rain gauge locations are shown in Figure 3-1.
Figure 3-1. Map of Rain Gauge Locations
Figure 3-3 shows the rainfall during the flow monitoring period, averaged between the six rain gauges within (or very near to) the targeted area. Figure 3-4 shows the rain accumulation plot versus historical 1 National Oceanic and Atmospheric Administration (NOAA) Citizen Weather Observer Program (CWOP) members send data from their PWS to the NOAA MADIS server; the data undergoes quality checking and then is distributed. While V&A has no direct control over the rain gauges, V&A performs additional QA/QC on the data to ensure its suitability for use.
11.a
Packet Pg. 320 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |11
average2 period rainfalls for these same six rain gauges; rainfall for this study was approximately 47% higher than the historical precipitation during the flow monitoring period.
Figure 3-2. Rainfall during Flow Monitoring Period – Average of North and Central Rain Gauges Figure 3-3. Rainfall during Flow Monitoring Period – Average of South Rain Gauges 2 Historical data taken from the WRCC (triangulated from Station 43714 in Half Moon Bay and Station 47769 in in San Francisco WSO AP ): http://www.wrcc.dri.edu/summary/climsmsca.html
0.00 0.20
0.40 0.60
0.80 1.00
1.20 6-Dec7-Dec8-Dec9-Dec
10-Dec11-Dec12-Dec13-Dec14-Dec15-Dec16-Dec17-Dec18-Dec19-Dec20-Dec21-Dec22-Dec23-Dec24-Dec25-Dec26-Dec27-Dec28-Dec29-Dec30-Dec31-Dec 1-Jan2-Jan3-Jan4-Jan5-Jan6-Jan7-Jan8-Jan9-Jan
10-Jan11-Jan12-Jan13-Jan
Rain (inches per hour)
Total Rainfall over Period: 10.23 inches
Event 2: 4.86 inches
Event 1: 4.68 inches
0.00 0.20
0.40 0.60
0.80 1.00
1.20 6-Dec7-Dec8-Dec9-Dec
10-Dec11-Dec12-Dec13-Dec14-Dec15-Dec16-Dec17-Dec18-Dec19-Dec20-Dec21-Dec22-Dec23-Dec24-Dec25-Dec26-Dec27-Dec28-Dec29-Dec30-Dec31-Dec 1-Jan2-Jan3-Jan4-Jan5-Jan6-Jan7-Jan8-Jan9-Jan
10-Jan11-Jan12-Jan13-Jan
Rain (inches per hour)
Total Rainfall over Period: 14.94 inches
Event 2: 6.19 inches
Event 1: 7.47 inches
11.a
Packet Pg. 321 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |12
Figure 3-4. Rainfall Accumulation Plot - triangulated to Pacifica City Hall
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 6-Dec8-Dec
10-Dec12-Dec14-Dec16-Dec18-Dec20-Dec22-Dec24-Dec26-Dec28-Dec30-Dec 1-Jan3-Jan5-Jan7-Jan9-Jan
11-Jan13-Jan
Rain (inches)
Historical Average
N
C
CE
SW
S
SE
Period Rainfall Triangulated
7.49 10.98
9.95 9.75
15.62 14.26
14.95 10.98
11.a
Packet Pg. 322 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |13
Regional Rainfall Event Classification
It is important to classify the relative size of a major storm event that occurs over the course of a flow monitoring period3. Rainfall events are classified by intensity and duration. Based on historical data, frequency contour maps for storm events of given intensity and duration have been developed by the NOAA for all areas within the continental United States (Figure 3-5).
Figure 3-5. NOAA Southern California Rainfall Frequency Map For example, the NOAA Rainfall Frequency Atlas 4 classifies a 10-year, 24-hour storm event at the Central rain gauge location as 4.04 inches. This means that in any given year, at this specific location, there is a 10% chance that 4.04 inches of rain will fall in any 24-hour period.
From the NOAA frequency maps, for a specific latitude and longitude, the rainfall densities for period durations ranging from 1 hour to 20 days are known for rain events ranging from 1-year to 10-year intensities. These are plotted to develop a rain event frequency map specific to each rainfall monitoring site. Superimposing the peak measured densities for the rainfall events on the rain event fre quency plot determines the classification of the rainfall event. Figure 3-6 to Figure 3-11 illustrate the rain event classification plots at each rain gauge. Table 3-1 summarizes the rainfall that fell for all rain gauges for key rainfall events and overall for the flow monitoring period. 3 Sanitary sewers are often designed to withstand I/I contribution to sanitary flows for specific-sized “design” storm events. 4 NOAA Western U.S. Precipitation Frequency Maps Atlas 14, Volume 6, 2011:
ftp://hdsc.nws.noaa.gov/pub/hdsc/data/sw/ca10y24h.pdf
11.a
Packet Pg. 323 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |14
Figure 3-6. Rainfall Event Classification – Rain Gauge North Figure 3-7. Rainfall Event Classification – Rain Gauge Central 1 2
5 10
25 50
0 1
2 3
4 5
6 Inches of Rain
12/12/21 - 12/17/21
12/21/21 - 12/29/21
1-hr 2-hr 3-hr 6-hr 12-hr 24-hr
1 2
5 10
25 50
0 1
2 3
4 5
6 Inches of Rain
12/12/21 - 12/17/21
12/21/21 - 12/29/21
1-hr 2-hr 3-hr 6-hr 12-hr 24-hr
11.a
Packet Pg. 324 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |15
Figure 3-8. Rainfall Event Classification – Rain Gauge Central East Figure 3-9. Rainfall Event Classification – Rain Gauge South
1 2
5 10
25 0
1 2
3 4
5 6
Inches of Rain
12/12/21 - 12/17/21
12/21/21 - 12/29/21
1-hr 2-hr 3-hr 6-hr 12-hr 24-hr
1 2
5 10
25 0
1 2
3 4
5 6
7 8
Inches of Rain
12/12/21 - 12/17/21
12/21/21 - 12/29/21
1-hr 2-hr 3-hr 6-hr 12-hr 1-day 2-day 3-day 4-day
11.a
Packet Pg. 325 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |16
Figure 3-10. Rainfall Event Classification – Rain Gauge Southwest
Figure 3-11. Rainfall Event Classification – Rain Gauge Southeast
1 2
5 10
25 0
1 2
3 4
5 6
7 8
Inches of Rain
12/12/21 - 12/17/21
12/21/21 - 12/29/21
1-hr 2-hr 3-hr 6-hr 12-hr 1-day 2-day 3-day 4-day
1 2
5 10
0 1
2 3
4 5
6 7
8 Inches of Rain
12/12/21 - 12/17/21
12/21/21 - 12/29/21
1-hr 2-hr 3-hr 6-hr 12-hr 1-day 2-day 3-day 4-day
11.a
Packet Pg. 326 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |17
Table 3-1. Summary of Rainfall
Rain Gauge
Event 1: Dec 12 – 17, 2021 Event 2: Dec 21 – 29, 2021
Short
Duration
Long Duration Short
Duration
Long Duration
North 5-Yr,12-Hr 3-Yr, 4-Day <1-Yr <1-Yr
Central East 2-Yr, 24-Hr 1.5-Yr, 4-Day <1-Yr <1-Yr
Central 9-Yr, 12-Hr 4-Yr, 4-Day 1.5-Yr, 6-Hr 1-Yr, 9-Day Southwest
(SW) 18-Yr,2-Day 21-Yr,4-Day 2-Yr, 8-Hr 2-Yr, 9-Day
South 24-Yr, 2Day 26-Yr, 4-Day 3-Yr, 8-Hour 2-Yr, 9-Day Southeast
(SE) 18-Yr, 2-Day 15-Yr, 4-Day 2-Yr, 8-Hour 2-Yr, 9-Day Based on the available data, a geographical difference in rain intensity was observed as the rain intensity increased sharply from north to south.
11.a
Packet Pg. 327 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |18
Rain Gauge Triangulation Distribution
The rainfall affecting the sanitary sewer collection system basins must be calculated based on the proximity to the rain gauge locations. The mean precipitation for each site’s upstream basin was calculated by taking data from the rain gauges and using the inverse distance weighting (IDW) method.
IDW is an interpolation method that assumes the influence of each rain gauge location diminishes with distance. The center of an upstream basin 5 is identified, and a weighted triangulated average is taken of the precipitation data from nearby rain gauge locations.
The IDW function is as follows:
=
p
p
d
d weight d
1 1
( )
, where: d = distance p = power (p > 0)
The value of p is user defined. The most common choice for hydrological studies of watershed areas is p = 2.
Figure 3 6 illustrates the IDW method with sample data. The rain gauge distribution as calculated for each flow monitoring basin is shown in Table 3-2.
Figure 3-12. Rainfall Inverse Distance Weighting Method 5 Note that the full basin upstream of the site was used instead of the isolated basins as the rain data will be compared to th e flow at each site
11.a
Packet Pg. 328 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |19
Table 3-2. Rain Gauge Distribution per Monitoring Site
Site North Central Centraleast Southwest South Southeast P1 83.16% 9.27% 7.57% 0.00% 0.00% 0.00%
P2 23.19% 34.85% 41.95% 0.00% 0.00% 0.00%
P3 1.25% 95.21% 3.54% 0.00% 0.00% 0.00%
P4 0.00% 0.00% 0.00% 89.90% 5.28% 4.82%
P5 0.00% 0.00% 0.00% 23.79% 68.36% 7.85%
11.a
Packet Pg. 329 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |20
3.2 Flow Monitoring Data
Peak measured flows and the flow elevation at the peak flow are important to understanding the capacity of a storm sewer system, both in terms of conveyance and potential flooding. The peak flows and flow levels reported are from the peak measurements as taken across the entirety of the flow monitoring period.
Error! Reference source not found.Table 3-3 summarizes the peak recorded flows, levels, and d/H ratios per site during the flow monitoring period. Capacity analysis data is presented on a site-by-site basis and represents the hydraulic conditions only at the point site location; hydraulic conditions in other areas of the collection system will differ.
The totalized flow is defined as the total flow that passed through the monitoring sites from December 10, 2021, to January 11, 2022.
Table 3-3. Capacity Analysis Summary
Site Name Peak Level
(in)1
Diameter/
Height (in) d/H
Peak
Measured
Flow (mgd)
Totalized
Flow
(gallons)
Site 1 5.28 42.50 0.12 6.64 15,165,000
Site 2 15.10 49.00 0.31 39.75 74,783,000
Site 3 10.32 47.75 0.22 10.83 21,564,000
Site 4 100.71 62.00 1.72 27.10 25,253,000
Site 5 40.13 36.00 1.11 26.46 40,368,000
11.a
Packet Pg. 330 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 331 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Results and Analysis
21-0090 | City of Pacifica | 2021 Flow Monitoring |21
11.a
Packet Pg. 332 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Appendix A
Flow Monitoring Sites: Data, Graphs, and Information
21-0090 | City of Pacifica | 2021 Flow Monitoring |A - 1
Appendix A
Flow Monitoring Sites: Data,
Graphs, and Information
11.a
Packet Pg. 333 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information Monitoring Site:
Location:
P1
Hwy 1 & Monterey Rd
Storm Sewer Flow Monitoring 2021/2022
City of Pacifica
Vicinity Map: P1
Data Summary Report
December 06, 2021 - January 11, 2022
| P1 - 1
11.a
Packet Pg. 334 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Site Information
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information MH ID: P1
Measured Pipe Diameter: 42.5 inches
ADWF: 0.00 mgd
Peak Measured Flow: 6.64 mgd
Flow Sketch
Satellite Map
Street View
Sanitary Map
Location: Hwy 1 & Monterey Rd
Rim Elevation (Earth): 120 feet
Plan View
Coordinates: 122.4900° W, 37.6510° N
Sediment: None
| P1 - 2
11.a
Packet Pg. 335 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Additional Site Photos
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information Effluent Pipe
Monitored Influent Pipe
| P1 - 3
11.a
Packet Pg. 336 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Period Flow Summary: Daily Flow Totals
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0000.5001.0001.5002.0002.5003.000
12/10
12/12
12/14
12/16
12/18
12/20
12/22
12/24
12/26
12/28
12/30
1/1
1/3
1/5
1/7
1/9
1/11
0.00.51.01.52.02.53.03.54.04.55.0 Realtime Weekend
0.0000.5001.0001.5002.0002.5003.000
12/10
12/12
12/14
12/16
12/18
12/20
12/22
12/24
12/26
12/28
12/30
1/1
1/3
1/5
1/7
1/9
1/11
0.00.51.01.52.02.53.03.54.04.55.0 Realtime Weekday
Total Rainfall: 10.03 inchesAvg Daily Flow: 0.361 MGal Peak Daily Flow: 2.530 MGal Min Daily Flow: 0.000 MGal | P1 - 4
11.a
Packet Pg. 337
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Flow Summary: 12/10/2021 to 1/11/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0001.0002.0003.0004.0005.0006.0007.0008.000
Dec 10
(Fri)
Dec 11
(Sat)
Dec 12
(Sun)
Dec 13
(Mon)
Dec 14
(Tue)
Dec 15
(Wed)
Dec 16
(Thu)
Dec 17
(Fri)
Dec 18
(Sat)
Dec 19
(Sun)
Dec 20
(Mon)
Dec 21
(Tue)
Dec 22
(Wed)
Dec 23
(Thu)
Dec 24
(Fri)
Dec 25
(Sat)
Flow ( mgd)
0.00.20.40.60.81.01.21.41.61.82.0 Rain fall ( in /h r)
Rain Flow ADWF
0.0001.0002.0003.0004.0005.0006.0007.000
Dec 26
(Sun)
Dec 27
(Mon)
Dec 28
(Tue)
Dec 29
(Wed)
Dec 30
(Thu)
Dec 31
(Fri)
Jan 01
(Sat)
Jan 02
(Sun)
Jan 03
(Mon)
Jan 04
(Tue)
Jan 05
(Wed)
Jan 06
(Thu)
Jan 07
(Fri)
Jan 08
(Sat)
Jan 09
(Sun)
Jan 10
(Mon)
Jan 11
(Tue)
Flow ( mgd)
0.00.20.40.60.81.01.21.41.61.82.0 Rain fall ( in /hr)
Period Rainfall: 9.90 inches Period Avg Flow: 0.460 mgd Period Peak Flow: 6.642 mgd Period Min Flow: 0.000 mgd | P1 - 5
11.a
Packet Pg. 338
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Weekly Level, Velocity and Flow Hydrographs
12/6/2021 to 12/13/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 18.0
Vel oci ty (fps)
Vel
0.00 1.00
2.00 3.00
4.00 5.00
6.00 7.00
12/6 12/7 12/8 12/9 12/10 12/11 12/12
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 0.79 inches Rain Flow ADWF
Avg Level: 0.27 in. Peak Level: 1.84 in. Min Level: 0.00 in.
Avg Velocity: 0.70 fps Peak Velocity: 12.47 fps Min Velocity: 0.00 fps Avg Flow: 0.027 mgd Peak Flow: 1.194 mgd Min Flow: 0.000 mgd | P1 - 6
11.a
Packet Pg. 339 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Weekly Level, Velocity and Flow Hydrographs
12/13/2021 to 12/20/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 18.0
Vel oci ty (fps)
Vel
0.00 1.00
2.00 3.00
4.00 5.00
6.00 7.00
8.00 12/13 12/14 12/15 12/16 12/17 12/18 12/19
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 4.01 inches Rain Flow ADWF
Avg Level: 1.45 in. Peak Level: 5.28 in. Min Level: 0.50 in.
Avg Velocity: 8.42 fps Peak Velocity: 15.88 fps Min Velocity: 3.83 fps Avg Flow: 0.735 mgd Peak Flow: 6.642 mgd Min Flow: 0.092 mgd | P1 - 7
11.a
Packet Pg. 340 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Weekly Level, Velocity and Flow Hydrographs
12/20/2021 to 12/27/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 18.0
Vel oci ty (fps)
Vel
0.00 1.00
2.00 3.00
4.00 5.00
6.00 7.00
12/20 12/21 12/22 12/23 12/24 12/25 12/26
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 3.26 inches Rain Flow ADWF
Avg Level: 1.40 in. Peak Level: 5.21 in. Min Level: 0.43 in.
Avg Velocity: 8.52 fps Peak Velocity: 15.16 fps Min Velocity: 4.19 fps Avg Flow: 0.649 mgd Peak Flow: 5.852 mgd Min Flow: 0.071 mgd | P1 - 8
11.a
Packet Pg. 341 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Weekly Level, Velocity and Flow Hydrographs
12/27/2021 to 1/3/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 18.0
Vel oci ty (fps)
Vel
0.00 1.00
2.00 3.00
4.00 5.00
6.00 7.00
12/27 12/28 12/29 12/30 12/31 1/1 1/2
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.40 inches Rain Flow ADWF
Avg Level: 1.15 in. Peak Level: 4.20 in. Min Level: 0.50 in.
Avg Velocity: 7.95 fps Peak Velocity: 15.46 fps Min Velocity: 3.91 fps Avg Flow: 0.435 mgd Peak Flow: 4.036 mgd Min Flow: 0.086 mgd | P1 - 9
11.a
Packet Pg. 342 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Weekly Level, Velocity and Flow Hydrographs
12/27/2021 to 1/3/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 18.0
Vel oci ty (fps)
Vel
0.00 1.00
2.00 3.00
4.00 5.00
6.00 7.00
12/27 12/28 12/29 12/30 12/31 1/1 1/2
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.40 inches Rain Flow ADWF
Avg Level: 1.15 in. Peak Level: 4.20 in. Min Level: 0.50 in.
Avg Velocity: 7.95 fps Peak Velocity: 15.46 fps Min Velocity: 3.91 fps Avg Flow: 0.435 mgd Peak Flow: 4.036 mgd Min Flow: 0.086 mgd | P1 - 9
11.a
Packet Pg. 343 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Weekly Level, Velocity and Flow Hydrographs
1/3/2022 to 1/10/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 18.0
Vel oci ty (fps)
Vel
0.00 1.00
2.00 3.00
4.00 5.00
6.00 7.00
1/3 1/4 1/5 1/6 1/7 1/8 1/9
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 0.58 inches Rain Flow ADWF
Avg Level: 0.92 in. Peak Level: 2.75 in. Min Level: 0.48 in.
Avg Velocity: 7.28 fps Peak Velocity: 12.37 fps Min Velocity: 3.88 fps Avg Flow: 0.266 mgd Peak Flow: 1.806 mgd Min Flow: 0.067 mgd | P1 - 10
11.a
Packet Pg. 344 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P1
Weekly Level, Velocity and Flow Hydrographs
1/10/2022 to 1/17/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 18.0
Vel oci ty (fps)
Vel
0.00 1.00
2.00 3.00
4.00 5.00
6.00 7.00
1/10 1/11 1/12 1/13 1/14 1/15 1/16
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Rain Flow ADWF
Avg Level: 0.24 in. Peak Level: 1.18 in. Min Level: 0.00 in.
Avg Velocity: 1.84 fps Peak Velocity: 8.47 fps Min Velocity: 0.00 fps Avg Flow: 0.054 mgd Peak Flow: 0.356 mgd Min Flow: 0.000 mgd | P1 - 11
11.a
Packet Pg. 345 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information Monitoring Site:
Location:
P2
Edgemar Ave, south of Arroyo Dr
Storm Sewer Flow Monitoring 2021/2022
City of Pacifica
Vicinity Map: P2
Data Summary Report
December 06, 2021 - January 11, 2022
| P2 - 1
11.a
Packet Pg. 346 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Site Information
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information MH ID: P2
Measured Pipe Diameter: 49 inches
ADWF: 0.00 mgd
Peak Measured Flow: 39.75 mgd
Flow Sketch
Satellite Map
Street View
Sanitary Map
Location: Edgemar Ave, south of Arroyo Dr
Rim Elevation (Earth): 83 feet
Plan View
Coordinates: 122.4902° W, 37.6464° N
Sediment: None
| P2 - 2
11.a
Packet Pg. 347 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Additional Site Photos
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information Monitored Effluent Pipe
East Influent Pipe
| P2 - 3
11.a
Packet Pg. 348 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Period Flow Summary: Daily Flow Totals
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0002.0004.0006.0008.000
10.00012.00014.00016.00018.000
12/10
12/12
12/14
12/16
12/18
12/20
12/22
12/24
12/26
12/28
12/30
1/1
1/3
1/5
1/7
1/9
1/11
0.00.51.01.52.02.53.03.54.04.55.0 Realtime Weekend
0.0002.0004.0006.0008.000
10.00012.00014.00016.00018.000
12/10
12/12
12/14
12/16
12/18
12/20
12/22
12/24
12/26
12/28
12/30
1/1
1/3
1/5
1/7
1/9
1/11
0.00.51.01.52.02.53.03.54.04.55.0 Realtime Weekday
Total Rainfall: 10.23 inchesAvg Daily Flow: 1.781 MGal Peak Daily Flow: 16.066 MGal Min Daily Flow: 0.000 MGal | P2 - 5
11.a
Packet Pg. 349
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Flow Summary: 12/10/2021 to 1/11/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0005.000
10.00015.00020.00025.00030.00035.00040.00045.000
Dec 10
(Fri)
Dec 11
(Sat)
Dec 12
(Sun)
Dec 13
(Mon)
Dec 14
(Tue)
Dec 15
(Wed)
Dec 16
(Thu)
Dec 17
(Fri)
Dec 18
(Sat)
Dec 19
(Sun)
Dec 20
(Mon)
Dec 21
(Tue)
Dec 22
(Wed)
Dec 23
(Thu)
Dec 24
(Fri)
Dec 25
(Sat)
Flow ( mgd)
0.00.20.40.60.81.01.21.41.61.82.0 Rain fall ( in /h r)
Rain Flow ADWF
0.0005.000
10.00015.00020.00025.00030.00035.00040.00045.000
Dec 26
(Sun)
Dec 27
(Mon)
Dec 28
(Tue)
Dec 29
(Wed)
Dec 30
(Thu)
Dec 31
(Fri)
Jan 01
(Sat)
Jan 02
(Sun)
Jan 03
(Mon)
Jan 04
(Tue)
Jan 05
(Wed)
Jan 06
(Thu)
Jan 07
(Fri)
Jan 08
(Sat)
Jan 09
(Sun)
Jan 10
(Mon)
Jan 11
(Tue)
Flow ( mgd)
0.00.20.40.60.81.01.21.41.61.82.0 Rain fall ( in /hr)
Period Rainfall: 10.10 inches Period Avg Flow: 2.266 mgd Period Peak Flow: 39.751 mgd Period Min Flow: 0.000 mgd | P2 - 6
11.a
Packet Pg. 350
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Weekly Level, Velocity and Flow Hydrographs
12/6/2021 to 12/13/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 5.0
10.0 15.0
20.0 25.0
Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 35.00
40.00 45.00
12/6 12/7 12/8 12/9 12/10 12/11 12/12
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 0.70 inches Rain Flow ADWF
Avg Level: 0.42 in. Peak Level: 4.72 in. Min Level: 0.00 in.
Avg Velocity: 2.18 fps Peak Velocity: 17.28 fps Min Velocity: 0.00 fps Avg Flow: 0.168 mgd Peak Flow: 6.923 mgd Min Flow: 0.000 mgd | P2 - 7
11.a
Packet Pg. 351 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Weekly Level, Velocity and Flow Hydrographs
12/13/2021 to 12/20/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 5.0
10.0 15.0
20.0 25.0
Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 35.00
40.00 45.00
12/13 12/14 12/15 12/16 12/17 12/18 12/19
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 4.07 inches Rain Flow ADWF
Avg Level: 3.42 in. Peak Level: 15.10 in. Min Level: 0.25 in.
Avg Velocity: 9.86 fps Peak Velocity: 22.62 fps Min Velocity: 3.64 fps Avg Flow: 4.086 mgd Peak Flow: 39.751 mgd Min Flow: 0.031 mgd | P2 - 8
11.a
Packet Pg. 352 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Weekly Level, Velocity and Flow Hydrographs
12/20/2021 to 12/27/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 5.0
10.0 15.0
20.0 25.0
Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 35.00
40.00 45.00
12/20 12/21 12/22 12/23 12/24 12/25 12/26
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 3.59 inches Rain Flow ADWF
Avg Level: 3.10 in. Peak Level: 12.86 in. Min Level: 0.02 in.
Avg Velocity: 9.78 fps Peak Velocity: 22.69 fps Min Velocity: 2.76 fps Avg Flow: 3.472 mgd Peak Flow: 35.037 mgd Min Flow: 0.000 mgd | P2 - 9
11.a
Packet Pg. 353 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Weekly Level, Velocity and Flow Hydrographs
12/27/2021 to 1/3/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 5.0
10.0 15.0
20.0 25.0
Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 35.00
40.00 45.00
12/27 12/28 12/29 12/30 12/31 1/1 1/2
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.30 inches Rain Flow ADWF
Avg Level: 2.45 in. Peak Level: 9.58 in. Min Level: 0.95 in.
Avg Velocity: 8.92 fps Peak Velocity: 20.66 fps Min Velocity: 4.66 fps Avg Flow: 1.811 mgd Peak Flow: 19.426 mgd Min Flow: 0.208 mgd | P2 - 10
11.a
Packet Pg. 354 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Weekly Level, Velocity and Flow Hydrographs
12/27/2021 to 1/3/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 5.0
10.0 15.0
20.0 25.0
Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 35.00
40.00 45.00
12/27 12/28 12/29 12/30 12/31 1/1 1/2
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.30 inches Rain Flow ADWF
Avg Level: 2.45 in. Peak Level: 9.58 in. Min Level: 0.95 in.
Avg Velocity: 8.92 fps Peak Velocity: 20.66 fps Min Velocity: 4.66 fps Avg Flow: 1.811 mgd Peak Flow: 19.426 mgd Min Flow: 0.208 mgd | P2 - 10
11.a
Packet Pg. 355 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Weekly Level, Velocity and Flow Hydrographs
1/3/2022 to 1/10/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 5.0
10.0 15.0
20.0 25.0
Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 35.00
40.00 45.00
1/3 1/4 1/5 1/6 1/7 1/8 1/9
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 0.56 inches Rain Flow ADWF
Avg Level: 1.95 in. Peak Level: 5.86 in. Min Level: 1.08 in.
Avg Velocity: 7.91 fps Peak Velocity: 20.24 fps Min Velocity: 5.03 fps Avg Flow: 1.008 mgd Peak Flow: 9.642 mgd Min Flow: 0.308 mgd | P2 - 11
11.a
Packet Pg. 356 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P2
Weekly Level, Velocity and Flow Hydrographs
1/10/2022 to 1/17/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 14.0
16.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 5.0
10.0 15.0
20.0 25.0
Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 35.00
40.00 45.00
1/10 1/11 1/12 1/13 1/14 1/15 1/16
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Rain Flow ADWF
Avg Level: 0.42 in. Peak Level: 1.98 in. Min Level: 0.00 in.
Avg Velocity: 1.92 fps Peak Velocity: 8.96 fps Min Velocity: 0.00 fps Avg Flow: 0.139 mgd Peak Flow: 0.745 mgd Min Flow: 0.000 mgd | P2 - 12
11.a
Packet Pg. 357 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information Monitoring Site:
Location:
P3
Francisco Blvd
Storm Sewer Flow Monitoring 2021/2022
City of Pacifica
Vicinity Map: P3
Data Summary Report
December 06, 2021 - January 11, 2022
| P3 - 1
11.a
Packet Pg. 358 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Site Information
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information MH ID: P3
Measured Pipe Diameter: 47.75 inches
ADWF: 0.00 mgd
Peak Measured Flow: 10.83 mgd
Flow Sketch
Satellite Map
Street View
Sanitary Map
Location: Francisco Blvd
Rim Elevation (Earth): 15 feet
Plan View
Coordinates: 122.4889° W, 37.6298° N
Sediment: None
| P3 - 2
11.a
Packet Pg. 359 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Additional Site Photos
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information Effluent Pipe
Monitored Influent Pipe
| P3 - 3
11.a
Packet Pg. 360 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Period Flow Summary: Daily Flow Totals
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0000.5001.0001.5002.0002.5003.0003.5004.000
12/10
12/12
12/14
12/16
12/18
12/20
12/22
12/24
12/26
12/28
12/30
1/1
1/3
1/5
1/7
1/9
1/11
0.00.51.01.52.02.53.03.54.04.55.0 Realtime Weekend
0.0000.5001.0001.5002.0002.5003.0003.5004.000
12/10
12/12
12/14
12/16
12/18
12/20
12/22
12/24
12/26
12/28
12/30
1/1
1/3
1/5
1/7
1/9
1/11
0.00.51.01.52.02.53.03.54.04.55.0 Realtime Weekday
Total Rainfall: 10.92 inchesAvg Daily Flow: 0.513 MGal Peak Daily Flow: 3.556 MGal Min Daily Flow: 0.000 MGal | P3 - 4
11.a
Packet Pg. 361
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Flow Summary: 12/10/2021 to 1/11/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0002.0004.0006.0008.000
10.00012.000
Dec 10
(Fri)
Dec 11
(Sat)
Dec 12
(Sun)
Dec 13
(Mon)
Dec 14
(Tue)
Dec 15
(Wed)
Dec 16
(Thu)
Dec 17
(Fri)
Dec 18
(Sat)
Dec 19
(Sun)
Dec 20
(Mon)
Dec 21
(Tue)
Dec 22
(Wed)
Dec 23
(Thu)
Dec 24
(Fri)
Dec 25
(Sat)
Flow ( mgd)
0.00.20.40.60.81.01.21.41.61.82.0 Rain fall ( in /h r)
Rain Flow ADWF
0.0002.0004.0006.0008.000
10.00012.000
Dec 26
(Sun)
Dec 27
(Mon)
Dec 28
(Tue)
Dec 29
(Wed)
Dec 30
(Thu)
Dec 31
(Fri)
Jan 01
(Sat)
Jan 02
(Sun)
Jan 03
(Mon)
Jan 04
(Tue)
Jan 05
(Wed)
Jan 06
(Thu)
Jan 07
(Fri)
Jan 08
(Sat)
Jan 09
(Sun)
Jan 10
(Mon)
Jan 11
(Tue)
Flow ( mgd)
0.00.20.40.60.81.01.21.41.61.82.0 Rain fall ( in /hr)
Period Rainfall: 10.83 inches Period Avg Flow: 0.653 mgd Period Peak Flow: 10.832 mgd Period Min Flow: 0.000 mgd | P3 - 5
11.a
Packet Pg. 362
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Weekly Level, Velocity and Flow Hydrographs
12/6/2021 to 12/13/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Vel oci ty (fps)
Vel
0.00 2.00
4.00 6.00
8.00 10.00
12.00 12/6 12/7 12/8 12/9 12/10 12/11 12/12
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 0.63 inches Rain Flow ADWF
Avg Level: 0.75 in. Peak Level: 4.94 in. Min Level: 0.00 in.
Avg Velocity: 0.65 fps Peak Velocity: 7.10 fps Min Velocity: 0.00 fps Avg Flow: 0.111 mgd Peak Flow: 3.000 mgd Min Flow: 0.000 mgd | P3 - 6
11.a
Packet Pg. 363 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Weekly Level, Velocity and Flow Hydrographs
12/13/2021 to 12/20/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Vel oci ty (fps)
Vel
0.00 2.00
4.00 6.00
8.00 10.00
12.00 12/13 12/14 12/15 12/16 12/17 12/18 12/19
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 4.53 inches Rain Flow ADWF
Avg Level: 3.07 in. Peak Level: 9.20 in. Min Level: 1.60 in.
Avg Velocity: 3.86 fps Peak Velocity: 7.50 fps Min Velocity: 0.73 fps Avg Flow: 1.148 mgd Peak Flow: 7.869 mgd Min Flow: 0.065 mgd | P3 - 7
11.a
Packet Pg. 364 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Weekly Level, Velocity and Flow Hydrographs
12/20/2021 to 12/27/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Vel oci ty (fps)
Vel
0.00 2.00
4.00 6.00
8.00 10.00
12.00 12/20 12/21 12/22 12/23 12/24 12/25 12/26
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 3.87 inches Rain Flow ADWF
Avg Level: 2.78 in. Peak Level: 10.32 in. Min Level: 0.84 in.
Avg Velocity: 3.61 fps Peak Velocity: 9.02 fps Min Velocity: 0.00 fps Avg Flow: 0.979 mgd Peak Flow: 10.832 mgd Min Flow: 0.000 mgd | P3 - 8
11.a
Packet Pg. 365 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Weekly Level, Velocity and Flow Hydrographs
12/27/2021 to 1/3/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Vel oci ty (fps)
Vel
0.00 2.00
4.00 6.00
8.00 10.00
12.00 12/27 12/28 12/29 12/30 12/31 1/1 1/2
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.33 inches Rain Flow ADWF
Avg Level: 2.33 in. Peak Level: 7.03 in. Min Level: 1.58 in.
Avg Velocity: 3.08 fps Peak Velocity: 9.76 fps Min Velocity: 1.57 fps Avg Flow: 0.551 mgd Peak Flow: 7.175 mgd Min Flow: 0.136 mgd | P3 - 9
11.a
Packet Pg. 366 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Weekly Level, Velocity and Flow Hydrographs
12/27/2021 to 1/3/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Vel oci ty (fps)
Vel
0.00 2.00
4.00 6.00
8.00 10.00
12.00 12/27 12/28 12/29 12/30 12/31 1/1 1/2
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.33 inches Rain Flow ADWF
Avg Level: 2.33 in. Peak Level: 7.03 in. Min Level: 1.58 in.
Avg Velocity: 3.08 fps Peak Velocity: 9.76 fps Min Velocity: 1.57 fps Avg Flow: 0.551 mgd Peak Flow: 7.175 mgd Min Flow: 0.136 mgd | P3 - 9
11.a
Packet Pg. 367 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Weekly Level, Velocity and Flow Hydrographs
1/3/2022 to 1/10/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Vel oci ty (fps)
Vel
0.00 2.00
4.00 6.00
8.00 10.00
12.00 1/3 1/4 1/5 1/6 1/7 1/8 1/9
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 0.57 inches Rain Flow ADWF
Avg Level: 1.91 in. Peak Level: 4.95 in. Min Level: 1.50 in.
Avg Velocity: 2.08 fps Peak Velocity: 7.40 fps Min Velocity: 0.75 fps Avg Flow: 0.256 mgd Peak Flow: 2.861 mgd Min Flow: 0.065 mgd | P3 - 10
11.a
Packet Pg. 368 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P3
Weekly Level, Velocity and Flow Hydrographs
1/10/2022 to 1/17/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 2.0
4.0 6.0
8.0 10.0
12.0 Vel oci ty (fps)
Vel
0.00 2.00
4.00 6.00
8.00 10.00
12.00 1/10 1/11 1/12 1/13 1/14 1/15 1/16
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Rain Flow ADWF
Avg Level: 0.48 in. Peak Level: 1.95 in. Min Level: 0.00 in.
Avg Velocity: 0.40 fps Peak Velocity: 2.05 fps Min Velocity: 0.00 fps Avg Flow: 0.035 mgd Peak Flow: 0.181 mgd Min Flow: 0.000 mgd | P3 - 11
11.a
Packet Pg. 369 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information Monitoring Site:
Location:
P4
Behind houses off Anza Dr. Access from Northeast
Storm Sewer Flow Monitoring 2021/2022
City of Pacifica
Vicinity Map: P4
Data Summary Report
December 06, 2021 - January 11, 2022
| P4 - 1
11.a
Packet Pg. 370 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Site Information
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information MH ID: P4
Measured Pipe Diameter: 58.5 inches
ADWF: 0.00 mgd
Peak Measured Flow: 27.10 mgd
Flow Sketch
Satellite Map
Street View
Sanitary Map
Location: Behind houses off Anza Dr.
Access from Northeast
Rim Elevation (Earth): 1 feet
Plan View
Coordinates: 122.5015° W, 37.5980° N
Sediment: 4 inches
| P4 - 2
11.a
Packet Pg. 371 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Additional Site Photos
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information Monitored Effluent Pipe
North Influent Pipe
| P4 - 3
11.a
Packet Pg. 372 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Additional Site Photos
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information East Influent Pipe
| P4 - 4
11.a
Packet Pg. 373 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Period Flow Summary: Daily Flow Totals
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0001.0002.0003.0004.0005.0006.0007.0008.000
12/10
12/12
12/14
12/16
12/18
12/20
12/22
12/24
12/26
12/28
12/30
1/1
1/3
1/5
1/7
1/9
1/11
0.00.51.01.52.02.53.03.54.04.55.0 Realtime Weekend
0.0001.0002.0003.0004.0005.0006.0007.0008.000
12/10
12/12
12/14
12/16
12/18
12/20
12/22
12/24
12/26
12/28
12/30
1/1
1/3
1/5
1/7
1/9
1/11
0.00.51.01.52.02.53.03.54.04.55.0 Realtime Weekday
Total Rainfall: 14.36 inchesAvg Daily Flow: 0.601 MGal Peak Daily Flow: 6.717 MGal Min Daily Flow: 0.000 MGal | P4 - 5
11.a
Packet Pg. 374
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Flow Summary: 12/10/2021 to 1/11/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0005.000
10.00015.00020.00025.00030.000
Dec 10
(Fri)
Dec 11
(Sat)
Dec 12
(Sun)
Dec 13
(Mon)
Dec 14
(Tue)
Dec 15
(Wed)
Dec 16
(Thu)
Dec 17
(Fri)
Dec 18
(Sat)
Dec 19
(Sun)
Dec 20
(Mon)
Dec 21
(Tue)
Dec 22
(Wed)
Dec 23
(Thu)
Dec 24
(Fri)
Dec 25
(Sat)
Flow ( mgd)
0.00.20.40.60.81.01.21.41.61.82.0 Rain fall ( in /h r)
Rain Flow ADWF
0.0005.000
10.00015.00020.00025.00030.000
Dec 26
(Sun)
Dec 27
(Mon)
Dec 28
(Tue)
Dec 29
(Wed)
Dec 30
(Thu)
Dec 31
(Fri)
Jan 01
(Sat)
Jan 02
(Sun)
Jan 03
(Mon)
Jan 04
(Tue)
Jan 05
(Wed)
Jan 06
(Thu)
Jan 07
(Fri)
Jan 08
(Sat)
Jan 09
(Sun)
Jan 10
(Mon)
Jan 11
(Tue)
Flow ( mgd)
0.00.20.40.60.81.01.21.41.61.82.0 Rain fall ( in /hr)
Period Rainfall: 14.19 inches Period Avg Flow: 0.765 mgd Period Peak Flow: 27.095 mgd Period Min Flow: 0.000 mgd | P4 - 6
11.a
Packet Pg. 375
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Weekly Level, Velocity and Flow Hydrographs
12/6/2021 to 12/13/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 20.0
40.0 60.0
80.0 100.0
120.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 12/6 12/7 12/8 12/9 12/10 12/11 12/12
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.73 inches Rain Flow ADWF
Avg Level: 9.82 in. Peak Level: 64.69 in. Min Level: 0.00 in.
Avg Velocity: 0.04 fps Peak Velocity: 3.01 fps Min Velocity: 0.00 fps Avg Flow: 0.174 mgd Peak Flow: 4.994 mgd Min Flow: 0.000 mgd | P4 - 7
11.a
Packet Pg. 376 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Weekly Level, Velocity and Flow Hydrographs
12/13/2021 to 12/20/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 20.0
40.0 60.0
80.0 100.0
120.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 12/13 12/14 12/15 12/16 12/17 12/18 12/19
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 5.66 inches Rain Flow ADWF
Avg Level: 41.56 in. Peak Level: 100.71 in. Min Level: 5.65 in.
Avg Velocity: 0.43 fps Peak Velocity: 4.96 fps Min Velocity: 0.00 fps Avg Flow: 1.637 mgd Peak Flow: 17.744 mgd Min Flow: 0.015 mgd | P4 - 8
11.a
Packet Pg. 377 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Weekly Level, Velocity and Flow Hydrographs
12/20/2021 to 12/27/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 20.0
40.0 60.0
80.0 100.0
120.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 12/20 12/21 12/22 12/23 12/24 12/25 12/26
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 4.51 inches Rain Flow ADWF
Avg Level: 12.55 in. Peak Level: 80.90 in. Min Level: 5.45 in.
Avg Velocity: 0.76 fps Peak Velocity: 4.29 fps Min Velocity: 0.00 fps Avg Flow: 1.137 mgd Peak Flow: 27.095 mgd Min Flow: 0.000 mgd | P4 - 9
11.a
Packet Pg. 378 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Weekly Level, Velocity and Flow Hydrographs
12/27/2021 to 1/3/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 20.0
40.0 60.0
80.0 100.0
120.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 12/27 12/28 12/29 12/30 12/31 1/1 1/2
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.44 inches Rain Flow ADWF
Avg Level: 14.38 in. Peak Level: 53.26 in. Min Level: 5.06 in.
Avg Velocity: 0.43 fps Peak Velocity: 4.73 fps Min Velocity: 0.00 fps Avg Flow: 0.413 mgd Peak Flow: 7.452 mgd Min Flow: 0.008 mgd | P4 - 10
11.a
Packet Pg. 379 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Weekly Level, Velocity and Flow Hydrographs
12/27/2021 to 1/3/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 20.0
40.0 60.0
80.0 100.0
120.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 12/27 12/28 12/29 12/30 12/31 1/1 1/2
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.44 inches Rain Flow ADWF
Avg Level: 14.38 in. Peak Level: 53.26 in. Min Level: 5.06 in.
Avg Velocity: 0.43 fps Peak Velocity: 4.73 fps Min Velocity: 0.00 fps Avg Flow: 0.413 mgd Peak Flow: 7.452 mgd Min Flow: 0.008 mgd | P4 - 10
11.a
Packet Pg. 380 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Weekly Level, Velocity and Flow Hydrographs
1/3/2022 to 1/10/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 20.0
40.0 60.0
80.0 100.0
120.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 1/3 1/4 1/5 1/6 1/7 1/8 1/9
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.03 inches Rain Flow ADWF
Avg Level: 24.22 in. Peak Level: 68.33 in. Min Level: 4.69 in.
Avg Velocity: 0.14 fps Peak Velocity: 3.11 fps Min Velocity: 0.00 fps Avg Flow: 0.246 mgd Peak Flow: 6.672 mgd Min Flow: 0.000 mgd | P4 - 11
11.a
Packet Pg. 381 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P4
Weekly Level, Velocity and Flow Hydrographs
1/10/2022 to 1/17/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 20.0
40.0 60.0
80.0 100.0
120.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 1/10 1/11 1/12 1/13 1/14 1/15 1/16
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Rain Flow ADWF
Avg Level: 2.27 in. Peak Level: 15.56 in. Min Level: 0.00 in.
Avg Velocity: 0.00 fps Peak Velocity: 0.02 fps Min Velocity: 0.00 fps Avg Flow: 0.000 mgd Peak Flow: 0.001 mgd Min Flow: 0.000 mgd | P4 - 12
11.a
Packet Pg. 382 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information Monitoring Site:
Location:
P5
Desolo dr btwn Arguello & Linda Mar
Storm Sewer Flow Monitoring 2021/2022
City of Pacifica
Vicinity Map: P5
Data Summary Report
December 06, 2021 - January 11, 2022
| P5 - 1
11.a
Packet Pg. 383 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Site Information
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information MH ID: P5
Measured Pipe Diameter: 36 inches
ADWF: 0.00 mgd
Peak Measured Flow: 26.46 mgd
Flow Sketch
Satellite Map
Street View
Sanitary Map
Location: Desolo dr btwn Arguello & Linda
Mar
Rim Elevation (Earth): 4 feet
Plan View
Coordinates: 122.5011° W, 37.5944° N
Sediment: None
| P5 - 2
11.a
Packet Pg. 384 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Additional Site Photos
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information Effluent Pipe
Monitored East Influent Pipe
| P5 - 3
11.a
Packet Pg. 385 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Period Flow Summary: Daily Flow Totals
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0001.0002.0003.0004.0005.0006.0007.0008.0009.000
12/10
12/12
12/14
12/16
12/18
12/20
12/22
12/24
12/26
12/28
12/30
1/1
1/3
1/5
1/7
1/9
1/11
0.00.51.01.52.02.53.03.54.04.55.0 Realtime Weekend
0.0001.0002.0003.0004.0005.0006.0007.0008.0009.000
12/10
12/12
12/14
12/16
12/18
12/20
12/22
12/24
12/26
12/28
12/30
1/1
1/3
1/5
1/7
1/9
1/11
0.00.51.01.52.02.53.03.54.04.55.0 Realtime Weekday
Total Rainfall: 14.84 inchesAvg Daily Flow: 0.961 MGal Peak Daily Flow: 8.363 MGal Min Daily Flow: 0.000 MGal | P5 - 4
11.a
Packet Pg. 386
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Flow Summary: 12/10/2021 to 1/11/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0005.000
10.00015.00020.00025.00030.000
Dec 10
(Fri)
Dec 11
(Sat)
Dec 12
(Sun)
Dec 13
(Mon)
Dec 14
(Tue)
Dec 15
(Wed)
Dec 16
(Thu)
Dec 17
(Fri)
Dec 18
(Sat)
Dec 19
(Sun)
Dec 20
(Mon)
Dec 21
(Tue)
Dec 22
(Wed)
Dec 23
(Thu)
Dec 24
(Fri)
Dec 25
(Sat)
Flow ( mgd)
0.00.20.40.60.81.01.21.41.61.82.0 Rain fall ( in /h r)
Rain Flow ADWF
0.0005.000
10.00015.00020.00025.00030.000
Dec 26
(Sun)
Dec 27
(Mon)
Dec 28
(Tue)
Dec 29
(Wed)
Dec 30
(Thu)
Dec 31
(Fri)
Jan 01
(Sat)
Jan 02
(Sun)
Jan 03
(Mon)
Jan 04
(Tue)
Jan 05
(Wed)
Jan 06
(Thu)
Jan 07
(Fri)
Jan 08
(Sat)
Jan 09
(Sun)
Jan 10
(Mon)
Jan 11
(Tue)
Flow ( mgd)
0.00.20.40.60.81.01.21.41.61.82.0 Rain fall ( in /hr)
Period Rainfall: 14.70 inches Period Avg Flow: 1.223 mgd Period Peak Flow: 26.460 mgd Period Min Flow: 0.001 mgd | P5 - 5
11.a
Packet Pg. 387
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Weekly Level, Velocity and Flow Hydrographs
12/6/2021 to 12/13/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 5.0
10.0 15.0
20.0 25.0
30.0 35.0
40.0 45.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 7.0
8.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 12/6 12/7 12/8 12/9 12/10 12/11 12/12
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.78 inches Rain Flow ADWF
Avg Level: 1.04 in. Peak Level: 8.76 in. Min Level: 0.00 in.
Avg Velocity: 0.23 fps Peak Velocity: 4.10 fps Min Velocity: 0.00 fps Avg Flow: 0.260 mgd Peak Flow: 7.366 mgd Min Flow: 0.000 mgd | P5 - 6
11.a
Packet Pg. 388 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Weekly Level, Velocity and Flow Hydrographs
12/13/2021 to 12/20/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 5.0
10.0 15.0
20.0 25.0
30.0 35.0
40.0 45.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 7.0
8.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 12/13 12/14 12/15 12/16 12/17 12/18 12/19
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 5.95 inches Rain Flow ADWF
Avg Level: 4.24 in. Peak Level: 38.20 in. Min Level: 2.05 in.
Avg Velocity: 1.62 fps Peak Velocity: 7.23 fps Min Velocity: 0.34 fps Avg Flow: 2.242 mgd Peak Flow: 22.836 mgd Min Flow: 0.151 mgd | P5 - 7
11.a
Packet Pg. 389 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Weekly Level, Velocity and Flow Hydrographs
12/20/2021 to 12/27/2021
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 5.0
10.0 15.0
20.0 25.0
30.0 35.0
40.0 45.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 7.0
8.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 12/20 12/21 12/22 12/23 12/24 12/25 12/26
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 4.49 inches Rain Flow ADWF
Avg Level: 3.90 in. Peak Level: 40.13 in. Min Level: 1.97 in.
Avg Velocity: 1.50 fps Peak Velocity: 7.00 fps Min Velocity: 0.18 fps Avg Flow: 1.892 mgd Peak Flow: 26.460 mgd Min Flow: 0.078 mgd | P5 - 8
11.a
Packet Pg. 390 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Weekly Level, Velocity and Flow Hydrographs
12/27/2021 to 1/3/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 5.0
10.0 15.0
20.0 25.0
30.0 35.0
40.0 45.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 7.0
8.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 12/27 12/28 12/29 12/30 12/31 1/1 1/2
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.47 inches Rain Flow ADWF
Avg Level: 2.73 in. Peak Level: 13.93 in. Min Level: 1.77 in.
Avg Velocity: 1.11 fps Peak Velocity: 4.11 fps Min Velocity: 0.32 fps Avg Flow: 0.857 mgd Peak Flow: 12.326 mgd Min Flow: 0.121 mgd | P5 - 9
11.a
Packet Pg. 391 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Weekly Level, Velocity and Flow Hydrographs
12/27/2021 to 1/3/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 5.0
10.0 15.0
20.0 25.0
30.0 35.0
40.0 45.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 7.0
8.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 12/27 12/28 12/29 12/30 12/31 1/1 1/2
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.47 inches Rain Flow ADWF
Avg Level: 2.73 in. Peak Level: 13.93 in. Min Level: 1.77 in.
Avg Velocity: 1.11 fps Peak Velocity: 4.11 fps Min Velocity: 0.32 fps Avg Flow: 0.857 mgd Peak Flow: 12.326 mgd Min Flow: 0.121 mgd | P5 - 9
11.a
Packet Pg. 392 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Weekly Level, Velocity and Flow Hydrographs
1/3/2022 to 1/10/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 5.0
10.0 15.0
20.0 25.0
30.0 35.0
40.0 45.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 7.0
8.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 1/3 1/4 1/5 1/6 1/7 1/8 1/9
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Total Weekly Rainfall: 1.15 inches Rain Flow ADWF
Avg Level: 2.28 in. Peak Level: 11.52 in. Min Level: 1.72 in.
Avg Velocity: 0.72 fps Peak Velocity: 4.37 fps Min Velocity: 0.04 fps Avg Flow: 0.493 mgd Peak Flow: 10.678 mgd Min Flow: 0.017 mgd | P5 - 10
11.a
Packet Pg. 393 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) P5
Weekly Level, Velocity and Flow Hydrographs
1/10/2022 to 1/17/2022
Appendix A
Flow Monitoring Site Reports: Data, Graphs, Information
0.0 5.0
10.0 15.0
20.0 25.0
30.0 35.0
40.0 45.0
Mon Tue Wed Thu Fri Sat Sun
Level (i n)
Lev
0.0 1.0
2.0 3.0
4.0 5.0
6.0 7.0
8.0 Vel oci ty (fps)
Vel
0.00 5.00
10.00 15.00
20.00 25.00
30.00 1/10 1/11 1/12 1/13 1/14 1/15 1/16
Flow (mgd)
0.0 0.2
0.4 0.6
0.8 1.0
1.2 Rain (in/hr)
Rain Flow ADWF
Avg Level: 0.48 in. Peak Level: 1.72 in. Min Level: 0.00 in.
Avg Velocity: 0.06 fps Peak Velocity: 0.25 fps Min Velocity: 0.00 fps Avg Flow: 0.022 mgd Peak Flow: 0.091 mgd Min Flow: 0.000 mgd | P5 - 11
11.a
Packet Pg. 394 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) APPENDICES | STORM DRAINAGE SYSTEM MASTER PLAN | CITY OF PACIFICA Appendix E
CALIBRATION SHEETS
FINAL DRAFT | NOVEMBER 2022
11.a
Packet Pg. 395 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 396 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) STORM DRAIN CALIBRATION | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA P1 Storm Drain Calibration
Pipeline diameter: 42.5''
Area: 183 acres
Model Pipe ID: SD545
DRAFT | NOVEMBER 2022
0.0 0.1
0.2 0.3
0.4 0.5
0.6 0.7
0 0.8
2 4
6 8
10 12
14 12/9 12/10 12/11 12/12 12/13 12/14 12/15 12/16 12/17 12/18 12/19 12/20 12/21 12/22 12/23 12/24 12/25 12/26 12/27 12/28 12/29 12/30 12/31 1/1 1/2 1/3 1/4 1/5 1/6 1/7 1/8 1/9 1/10 1/11 Rain (inches/15-minutes)
Flow (mgd)
Storm Drain Flow Calibration
Rain Measured Data Modeled Data
11.a
Packet Pg. 397 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) STORM DRAIN CALIBRATION | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA P2 Storm Drain Calibration
Pipeline diameter: 45.5''
Area: 560 acres
Model Pipe ID: SD767
DRAFT | NOVEMBER 2022
0.0 0.1
0.2 0.3
0.4 0.5
0.6 0.7
0 0.8
5 10
15 20
25 30
35 40
45 50
55 60
12/9 12/10 12/11 12/12 12/13 12/14 12/15 12/16 12/17 12/18 12/19 12/20 12/21 12/22 12/23 12/24 12/25 12/26 12/27 12/28 12/29 12/30 12/31 1/1 1/2 1/3 1/4 1/5 1/6 1/7 1/8 1/9 1/10 1/11 Rain (inches/15-minutes)
Flow (mgd)
Storm Drain Flow Calibration
Rain Measured Data Modeled Data
11.a
Packet Pg. 398 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) STORM DRAIN CALIBRATION | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA P3 Storm Drain Calibration
Pipeline diameter: 47.75''
Area: 209 acres
Model Pipe ID: SD972
DRAFT | NOVEMBER 2022
0.0 0.1
0.2 0.3
0.4 0.5
0.6 0.7
0 0.8
5 10
15 20
25 30
12/9 12/10 12/11 12/12 12/13 12/14 12/15 12/16 12/17 12/18 12/19 12/20 12/21 12/22 12/23 12/24 12/25 12/26 12/27 12/28 12/29 12/30 12/31 1/1 1/2 1/3 1/4 1/5 1/6 1/7 1/8 1/9 1/10 1/11 Rain (inches/15-minutes)
Flow (mgd)
Storm Drain Flow Calibration
Rain Measured Data Modeled Data
11.a
Packet Pg. 399 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) STORM DRAIN CALIBRATION | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA P4 Storm Drain Calibration
Pipeline diameter: 59.5''
Area: 221 acres
Model Pipe ID: SD2186
DRAFT | NOVEMBER 2022
0.0 0.1
0.2 0.3
0.4 0.5
0.6 0.7
0 0.8
5 10
15 20
25 30
35 40
45 50
55 60
65 70
12/9 12/10 12/11 12/12 12/13 12/14 12/15 12/16 12/17 12/18 12/19 12/20 12/21 12/22 12/23 12/24 12/25 12/26 12/27 12/28 12/29 12/30 12/31 1/1 1/2 1/3 1/4 1/5 1/6 1/7 1/8 1/9 1/10 1/11 Rain (inches/15-minutes)
Flow (mgd)
Storm Drain Flow Calibration
Rain Measured Data Modeled Data
11.a
Packet Pg. 400 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) STORM DRAIN CALIBRATION | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA P5 Storm Drain Calibration
Pipeline diameter: 48" width x 36" height''
Area: 99 acres
Model Pipe ID: SD1744
DRAFT | NOVEMBER 2022
0.0 0.1
0.2 0.3
0.4 0.5
0.6 0.7
0 0.8
5 10
15 20
25 30
35 40
45 50
55 60
12/9 12/10 12/11 12/12 12/13 12/14 12/15 12/16 12/17 12/18 12/19 12/20 12/21 12/22 12/23 12/24 12/25 12/26 12/27 12/28 12/29 12/30 12/31 1/1 1/2 1/3 1/4 1/5 1/6 1/7 1/8 1/9 1/10 1/11 Rain (inches/15-minutes)
Flow (mgd)
Storm Drain Flow Calibration
Rain Measured Data Modeled Data
11.a
Packet Pg. 401 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 402 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) APPENDICES | STORM DRAINAGE SYSTEM MASTER PLAN | CITY OF PACIFICA Appendix F
CIP COST ESTIMATING DETAILS
FINAL DRAFT | NOVEMBER 2022
11.a
Packet Pg. 403 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 404 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 405 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 406 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 407 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 408 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 409 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 410 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 411 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 412 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 413 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 414 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 415 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 416 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 417 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 418
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 419
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 420
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 421
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 422
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 423
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 424
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) APPENDICES | STORM DRAINAGE SYSTEM MASTER PLAN | CITY OF PACIFICA Appendix G
CIP PROJECT DETAIL SHEETS
FINAL DRAFT | NOVEMBER 2022
11.a
Packet Pg. 425 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 426 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) CIP PROJECT SHEET | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA Project Name: Monterey Road
Project ID(s): MR-1A, MR-1B, MR-1C, and MR-2
Project Type: Capacity
Project Detail
Project Prioritization Project Components
Category 1 X l MR-1A. 2,020 feet of new 18-inch diameter pipe.
Category 2 l MR-1B. 40 feet of new 24-inch diameter pipe.
Category 3 l MR-1C. 750 feet of new 18-inch diameter pipe. l MR-2. 980 feet of new 15-inch diameter pipe.
Project Location
Project Cost Summary
Total Capital Improvement Cost $6,900,000
Project Description
As part of the stakeholder outreach, numerous drainage issues were reported in the vicinity of Monterey Road from Hickey Boulevard down to Highway 101. The drainage issues reported included severe flooding on Monterey Road and Nelson Avenue during large storm events, such as the October 2021 rainfall event, as issues within Big Inch Creak (including flooding and erosion concerns) behind the homes on Nelson Avenue and Monterey Road. This project includes the construction of a new 18-inch diameter and 30 inch diameter storm drain pipeline in Monterey Road. The 18-inch diameter storm drain would intercept runoff that would normally flow into Big Inch Creek, as well as runoff that currently can flow down Monterey Road and flood the street, and would extend from roughly 750-feet southeast of Hickey Boulevard to Hickey Boulevard. The proposed 30-inch diameter storm drain would extend from Hickey Boulevard west to the existing 30-inch storm drain just east of Waterford Street. It is also recommended that a new storm drain pipeline be constructed in Nelson Avenue from Perry Avenue to the existing 42-inch diameter storm drain just west of Johnson Avenue.
Source: Cost estimates were developed by Freyer
and Lauretta and are Class 4 estimates and
defined by the AACE. Costs are presented in 2022
dollars.
l Monterey Road, between west of Fremont
Avenue and north of Manor Drive.
l Nelson Avenue, between west of Johnson
Avenue and Perry Avenue.
11.a
Packet Pg. 427 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) CIP PROJECT SHEET | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA Project Name: West Lower Linda Mar
Project ID(s): WLM-1, and WLM-2
Project Type: Capacity
Project Detail
Project Prioritization Project Components
Category 1 X l WLM-1. 1,680 feet of new 36-inch diameter pipe.
Category 2 l WLM-2. 1,050 feet of new 30-inch diameter pipe.
Category 3
Project Location
Project Cost Summary
Total Capital Improvement Cost $5,200,000
Project Description
Source: Cost estimates were developed by Freyer
and Lauretta and are Class 4 estimates and
defined by the AACE. Costs are presented in 2022
dollars.
City staff have historically noted flooding in the vicinity of Montezuma Drive and De Solo Drive. The hydraulic/hydrologic model also predicted flooding would occur in this location during the 10-year and 50-year design storm events. The recommended improvement at this location is consistent with the recommended project included in the 2012 Storm Drainage System Master Plan. This project includes the installation of a new 36-inch pipeline from the inlet due west of Marvilla Place on Linda Mar Blvd, to the corner of Linda Mar Blvd and Highway 1. The 36-inch pipeline would continue along Highway 1 to the existing manhole at the northern corner of the Chevron gas station. And this project includes the installation of a new 30-inch pipeline from the corner of Peralta Road and Linda Mar Blvd, to the inlet located due west of Marvilla Place on Linda Mar Blvd. l Linda Mar Boulevard, west of Marvilla Place to
Highway 1.
l Linda Mar Boulevard, from Peralta Road to
inlet
located west of Marvilla Place.
11.a
Packet Pg. 428 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) CIP PROJECT SHEET | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA Project Name: Sharp Park
Project ID(s): SP-1A, SP-1B, SP-1C, and SP-2
Project Type: Capacity
Project Detail
Project Prioritization Project Components
Category 1 X l SP-1. A new 55,000 gpm lift station.
Category 2 l SP-1B. 910 feet of 30-inch diameter force main.
Category 3 l SP-1C. A new outfall.
l SP-2. 70 feet of 21-inch diameter gravity pipe.
Project Location
Project Cost Summary
Total Capital Improvement Cost $6,000,000
Project Description
Source: Cost estimates were developed by Freyer
and Lauretta and are Class 4 estimates and
defined by the AACE. Costs are presented in 2022
dollars.
This drainage area includes one of the City’s most significant and recurring flooding areas that regularly threatens businesses and residences. Flooding issues are caused by a combination of low-lying invert elevations and backwater effects/blockages from the existing outfall to Laguna Salada. The recommended improvements to this area will help the City to more effectively manage the interaction between the water level in Laguna Salada and the City’s storm drainage infrastructure. It is recommended that a new permanent storm drainage system pump station be constructed near the intersection of Clarendon Road and Lakeside Avenue. A new 30- inch force main and outfall is also recommended. The hydraulic model indicated that a short, 70-foot reach of existing storm drain line at the intersection of Brighton Road and Palmetto Avenue is undersized and could contribute to localized flooding under large storm events. It is recommended that a new 21-inch diameter storm drain be constructed.
l Intersection of Brighton Road and Palmetto
Avenue.
l Intersection of Clarendon Road and Lakeside
Avenue.
11.a
Packet Pg. 429 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) CIP PROJECT SHEET | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA Project Name: Edgemar Avenue
Project ID(s): EE-1, EE-2, EE-3, and EE-4
Project Type: Capacity and New Service
Project Detail
Project Prioritization Project Components
Category 1 l EE-1. A new 55,000 gpm lift station.
Category 2 X l EE-2. 910 feet of 30-inch diameter force main.
Category 3 l EE-1C. A new outfall.
l EE-2. 70 feet of 21-inch diameter gravity pipe.
Project Location
Project Cost Summary
Total Capital Improvement Cost $5,000,000
Project Description
l Edgemar Avenue, between Avalon Drive and
Arroyo Drive.
l Intersection of Brighton Road and Palmetto
Avenue.
Source: Cost estimates were developed by Freyer
and Lauretta and are Class 4 estimates and
defined by the AACE. Costs are presented in 2022
dollars.
The hydraulic model indicated that the existing storm drain line on Edgemar Avenue from Avalon Drive to Arroyo Drive is undersized, and could contribute to localized flooding under the 10-year and 50-year design storm events. In addition, the tributary area to this pipeline does not currently have storm drain infrastructure, which has contributed to street flooding in the area in the past. This project would replace the existing storm drain pipeline on Edgemar Avenue with a new 24-inch diameter storm drain pipeline.
It is recommended that a new system of 15-inch and 18-inch diameter storm drain pipelines be constructed on Edgemar Avenue , Avalon Drive, and Manor Drive to more efficiently convey runoff from the East Edgemar Bains to the proposed EE-1 project, thereby reducing the potential for future flooding in this area.
11.a
Packet Pg. 430 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) CIP PROJECT SHEET | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA Project Name: Rockaway Beach Avenue
Project ID(s): RW-1
Project Type: New Service
Project Detail
Project Prioritization Project Components
Category 1 l RW-1. 360 feet of new gravity pipe.
Category 2
Category 3 X
Project Location
Project Cost Summary
Total Capital Improvement Cost $700,000
Project Description
l Rockaway Beach Avenue and Oddstad Way.
Source: Cost estimates were developed by Freyer
and Lauretta and are Class 4 estimates and
defined by the AACE. Costs are presented in 2022
dollars.
As previously noted, there is a natural spring on Rockaway Beach Avenue which has led to a small amount of nuisance water that flows on the street throughout the year. This nuisance water has led to very localized property damage, and creates a tripping hazard for residents that live on Rockaway Beach Avenue. This project includes the construction of a short reach (360-feet) of storm drain line to convey runoff from the natural spring to an adjacent creek.
11.a
Packet Pg. 431 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) CIP PROJECT SHEET | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA Project Name: Madeira Drive
Project ID(s): LM-1
Project Type: Capacity
Project Detail
Project Prioritization Project Components
Category 1 l LM-1. 190 feet of new 30-inch diameter pipe.
Category 2
Category 3 X
Project Location
Project Cost Summary
Total Capital Improvement Cost $500,000
Project Description
l Maderia Drive, east of Capistrano Drive to San
Pedro Creek.
Source: Cost estimates were developed by Freyer
and Lauretta and are Class 4 estimates and
defined by the AACE. Costs are presented in 2022
dollars.
The hydraulic/hydrologic model indicated that there is a potential for street flooding on Madeira Drive east of Capistrano Drive under larger (50-year+) storm events. This project includes the construction of roughly 190-feet of new 30-inch storm drain from Madeira Drive to San Pedro Creek.
11.a
Packet Pg. 432 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) CIP PROJECT SHEET | STORM DRAIN MASTER PLAN UPDATE | CITY OF PACIFICA Project Name: Lauren Avenue
Project ID(s): V-1
Project Type: New Service
Project Detail
Project Prioritization Project Components
Category 1 l V-1. 700 feet of new 15-inch diameter pipe.
Category 2
Category 3 X
Project Location
Project Cost Summary
Total Capital Improvement Cost $1,200,000
Project Description
l Lauren Avenue south of Reina Del Mar Avenue.
Source: Cost estimates were developed by Freyer
and Lauretta and are Class 4 estimates and
defined by the AACE. Costs are presented in 2022
dollars.
City staff noted that there is currently no storm drain infrastructure on Lauren Avenue south of Reina Del Mar Avenue. This project is meant to more effectively convey runoff generated on Lauren Avenue and includes the construction of approximately 700-feet of new 15-inch diameter storm drain pipeline.
11.a
Packet Pg. 433 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 434 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) APPENDICES | STORM DRAINAGE SYSTEM MASTER PLAN | CITY OF PACIFICA Appendix H
FUNDING SOURCE SUMMARY
FINAL DRAFT | NOVEMBER 2022
11.a
Packet Pg. 435 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 436 Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) DRAFT | NOVEMBER ͮͬͮͮ | H‐ͭ
City of Pacifica – Funding Source Summary
Program Agency Type Description Deadlines/Next Steps Constraints Priority WaterInfrastructureFinance andInnovation Act(WIFIA)
EPA Loan
Financing mechanism for water, wastewater, stormwater, greeninfrastructure, energy efficiency projects, alternative water supply, aquiferrecharge, drought preventing/reduction/mitigation projects and acombination of projects secured by a common security thread whichprovides low interest rate financing for large dollar‐value water andwastewater projects. Projects must cost no less than ͈ͮͬ million or ͈ͱ million for small community projects (ͮͱ,ͬͬͬ or fewer) (projects can becombined and submitted as a group of projects) with the maximum amountof the loan not exceeding Ͱ͵ percent of the project costs. Maximum loanterm is ͯͱ years (including ͱ‐year repayment deferment). Interest rate isequal to the US Treasury rate of a similar maturity. Funds can be used tocover planning/design (retroactive) and construction activities. Applicationfees apply (average ͈ͮͬͬ,ͬͬͬ ‐ ͈ͯͬͬ,ͬͬͬ pending reviews and legalnegotiations). FY ͮͬͮͮ lending capacity is ͈ͱ.ͱ billion.Viable funding mechanism providing for Ͱ͵% of the project financingthrough low interest loans. Projects that can be completed within a ͱ‐Ͳ yearwindow, serve a similar purpose and will be repaid from the same revenuestream can be packaged as a group of projects under one loan.Link: https://www.epa.gov/wifia Letters of interest due startingon Sept. Ͳ, ͮͬͮͮ and acceptedon a rolling basis until all fundingis awarded (rolling applicationprocess).Email [email protected] Projects would need to be packagedtogether to meet program requirements ofminimum loan size >͈ͮͬM.
High Priority
WIFIA has a large loan capacity and fewer
restrictions on types of projects it funds. However,
the interest rate is higher the CWSRF program.
ContinuingAuthoritiesProgram
U.S. Army
Corps of
Engineers
(Corps)
Grant
Continuing Authorities Program (CAP) is a group of nine water resource related authorities contained in several different laws. The purpose of the CAP is to plan, design, and construct water resources projects of limited scope and complexity.Authorities most applicable to the City include:
103 ‐ Beach erosion and hurricane and storm damage reduction 204 ‐ Beneficial uses of dredged material 205 – Flood damage reduction Specifics of each authority vary, but all require a planning study before construction can begin. With 103 and 205, the Corps pays for $100,000 of study and cost is shared 50/50 beyond that. With 204, the Corps pays for 100% of the study. Construction cost is a 65% Corps and 35% non‐federal.
The federal limit per project is $10 million, including study.
Link:https://www.spn.usace.army.mil/Portals/68/docs/P%20and%20Programs/C ap%20Production%20Center/Factsheet_CAP_Resilience_Section205.pdf?ver=2020‐07‐30‐134820‐030 City must submit written request
by letter.Contact Tom Kendall, (Ͱͭͱ) ͱͬͯ‐
Ͳʹͮͮ [email protected].
mil
City must first engage in a planning study
with the Corps, which would increase costs
and delay construction plans.
Low Priority
. Projects don’t match authority criteria well.
11.a
Packet Pg. 437
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 438
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) DRAFT | NOVEMBER ͮͬͮͮ | H‐ͮ
Program Agency Type Description Deadlines/Next Steps Constraints Priority Section ͮͭ͵:EnvironmentalInfrastructureProgram
U.S. Army
Corps of
Engineers
(Corps)
Grant
Section 219 authorizes the Corps to provide assistance to non‐Federalinterests (local communities, water districts, sanitation districts, etc.) forcarrying out water‐related environmental infrastructure and resourceprotection and development projects.Program requires a cost share of ͳͱ% to ͮͱ% of Federal to Non‐Federal.The application is a two‐step process with Congressional authorizationrequired followed by appropriation of funds.Link: https://www.spn.usace.army.mil/ Recommended discussion withTom Kendall, (Ͱͭͱ) ͱͬͯ‐Ͳʹͮͮ [email protected] Congresswoman JackieSpeier, California’s ͭͰthCongressional District, fordiscussion of potentialappropriation.https://speier.house.gov/appropriations‐request The Corps must have an authorization from
Congress to begin a project or study.
Funding would allow for Corps assistance
but does not require a planning study.
Low Priority
CooperativeWatershedManagementProgram
U.S. Bureau
of
Reclamation
Grant
Funding for watershed group development, restoration planning, and management project design (Phase I) and implementation (Phase 2). A watershed group is a self‐sustaining, non‐regulatory, consensus‐based group that is composed of a diverse array of stakeholders of private property owners, non‐profit organizations, Federal, state, or local agencies, and tribes. Program has funded stormwater projects in the past.
Past application window ran Jan. – March, 2022. Maximum grant of $200,000.
Contact Program Coordinator,
Avra Morgan at ͯͬͯ‐ͰͰͱ‐ͮ͵ͬͲ.
Must include collaboration of watershed
stakeholders.
Not Eligible
Program is for watershed‐based projects and
requires a diverse array of partners.
Building ResilientInfrastructure andCommunities(BRIC)
FEMA and
California
Office of
Emergency
Services (Cal
OES)
Grant
FEMA pre‐disaster hazard mitigation program to incentivize new,innovative, large infrastructure projects that build resilient communitiesand reduce risks from hazards. Stormwater projects may be funded,provided project will protect community against future disasters, i.e.flooding.Total program funding is ͈ͮ.ͭ billion for FY ͮͬͮͮ. ͈ͱͬ million cap perproject. Project must be included in a FEMA‐approved Hazard MitigationPlan and project needs to comply with ͮͬͭʹ and ͮͬͮͭ InternationalBuilding Codes. Program requires a cost share of ͳͱ% to ͮͱ% of Federal toNon‐Federal.Links: https://www.caloes.ca.gov/office‐of‐the‐director/operations/recovery‐directorate/hazard‐mitigation/bric/https://www.fema.gov/grants/mitigation/building‐resilient‐infrastructure‐communities ͮͬͮͮ deadlines past. Funding willreopen in ͮͬͮͯ.Contact [email protected] Project must be included in a FEMA‐approved Hazard Mitigation Plan andproject needs to comply with ͮͬͭʹ and ͮͬͮͭ International Building Codes.
Low Priority
Projects must increase resiliency of system. Highly
competitive program.
11.a
Packet Pg. 439
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 440
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) DRAFT | NOVEMBER ͮͬͮͮ | H‐ͯ
Program Agency Type Description Deadlines/Next Steps Constraints Priority Flood Mitigation
Assistance (FMA)
Grants
FEMA and
California
Office of
Emergency
Services (Cal
OES)
Grant
Federal funds available to reduce or eliminate the risk of repetitive flood damage to states, local communities, and tribes and territories. Buildings and structures must be insured under the National Flood Insurance Program (NFIP). ͈ʹͬͬ million available nationwide with ͈ͯͰͬ million available for Localized Flood Risk Reduction Projects, including stormwater management. Cap of ͈ͱͬ million. Local cost share of ͮͱ%, ͭͬ% and ͬ% based on repetitive loss and social vulnerability.Eligible for Prepare California Match, which provides local match (ͮͱ% , ͭͬ% non‐federal cost share) to qualified entities for competitive and project scoping activities.
ͮͬͮͮ deadlines past.
Funding will reopen in Fall ͮͬͮͯ.
Contact [email protected]
Project benefits NFIP‐insured properties,supporting documentation on proposedproject boundary, benefiting area, and active NFIP Policies.Project must be included in a FEMA approved localHhazard Mitigation Plan.
Medium Priority
Grants are less competitive than BRIC to secure,
but current year deadlines have passed.
Clean Water StateRevolving Fund(CWSRF)
State Water
Resources
Control Board
(Water
Boards)
Loan/Grant
The Clean Water State Revolving Fund program provides low‐interestloans to eligible entities for a wide range of wastewater and storm waterprojects that protect surface water and groundwater resources.Program Eligibility (Including, but not limited to) Publicly owned wastewater treatment construction, repair or replacement;
Implementation of a non‐point source management plan; Decentralized systems treating municipal or domestic sewage; Reducing, treating, or managing stormwater; Reducing demand to publicly owned works through conservation; Watershed projects; Reducing energy consumption Projects for reusing or recycling wastewater or stormwater; Increasing security at publicly owned treatment works Loan rate is ½ most recent State General Obligation (GO) Bond Rate attime of approval. Terms up to ͯͬ years. Principal Forgiveness (PF) may beavailable to disadvantaged borrowers or borrowers that incorporatesustainability into projects. The state will have ͈ͭͳͳ to commit to PF inFYͮͮ‐ͮͯ.* Any CWSRF eligible project that implements a process, material,technique, or technology to mitigate stormwater runoff is eligible for PF.For projects that mitigate stormwater runoff that also contribute to watersupply resiliency, ͱͬ percent (ͱͬ%) of total eligible costs up to ͈ͱ.ͬ millionin PF. For feasibility and planning studies to identify stormwater mitigationprojects capable of contributing to water supply resiliency ͳͱ percent (ͳͱ%)of total eligible costs up to a maximum of ͈ͱͬͬ,ͬͬͬ. A maximum of ͈ͮͬ million is available for these projects and studies.
Applications accepted year‐round via portal (FAAST), emailand hard [email protected] or (͵ͭͲ) ͯͮͳ‐͵͵ͳʹ https://www.waterboards.ca.gov/water_issues/programs/grants_loans/srf/ Projects are evaluated and ranked based onthe level of water quality protectionachieved.Project will be scored and prioritized basedin part on project’s readiness to beingconstruction. If plans are greater than Ͱ͵%complete on December ͯͭ, then the projectwill receive ͭ “construction readiness point.”If greater than ʹ͵% complete on Decemberͯͭ, then ͮ points are given. It less than ͱͬ%,no points are given.
High Priority
PF funding is limited for stormwater projects and
provided on a first come, first served basis.
Applying early and with at least Ͱ͵% of plans
completed is ideal.
11.a
Packet Pg. 441
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 442
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) DRAFT | NOVEMBER ͮͬͮͮ | H‐Ͱ
Program Agency Type Description Deadlines/Next Steps Constraints Priority Small Community
CleanWater/Wastewater(SCWW) Funding
State Water
Resources
Control Board
(Water
Boards)
Loan/Grant
Part of CWSRF, this program provides low‐interest loans, grants, and principal forgiveness to small, disadvantaged communities forplanning/design and construction of projects that restore and maintain water quality in the state.
A disadvantaged community (DAC) has a median household income (MHI) < ʹͬ
% statewide MHI.
A small community is < or equal to ͮͬ,ͬͬͬ people.
Small communities can get ͱͬ
% principal forgiveness. Small DACs can get
ͭͬͬ%. Small non‐DAC and DAC septic‐to‐sewer conversions eligible for up to ͈ͭͳͱ,ͬͬͬ per household.
͈ʹͬͳ million available in FYͮͮ‐ͮͯ. Project must start construction by spring ͮͬͮͰ and complete construction by the end of ͮͬͮͱ.
Rolling application cycle for
[email protected]
a.gov or (͵ͭͲ) ͯͮͳ‐͵͵ͳʹ https://www.waterboards.ca.gov/water_issues/programs/grants_loans/srf/docs/ww‐grant‐fact‐sheet.pdf Community must be considered small and
disadvantaged to qualify for this program.
Not Eligible
The City’s community demographics are not a
good fit for the program.
Nonpoint SourceGrant Program
State Water
Resources
Control Board
(Water
Boards)
Grant
The Nonpoint Source Grant Program seeks proposals for projects thatreduce runoff of pollution to waters of the state, such as agriculturalprojects that reduce pesticide and nutrient runoff, improvement ordecommission of dirt roads to reduce erosion and sediment runoff,streambank stabilization to reduce erosion, marina programs to reducetoxic discharges from anti‐fouling paints on boats, and infrastructureimprovements for ranching and livestock operations to reduce erosion andrunoff of nutrients and pathogens.Approximately ͈Ͳ million was available in funding in ͮͬͮͮ. Applications arenow closed, but will most likely reopen in spring, ͮͬͮͯ.
Contact Michael Hanks, Div. ofWater Quality by email [email protected] or phone at (͵ͭͲ) ͯͰͭ‐ ͱͱͱʹ.
Not Eligible
The City’s projects do not fit within program’s goal
of reducing pollution and erosion.
11.a
Packet Pg. 443
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 444
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) DRAFT | NOVEMBER ͮͬͮͮ | H‐ͱ
Program Agency Type Description Deadlines/Next Steps Constraints Priority Sewer Overflowand StormwaterReuse MunicipalGrants (OSG)Program EPA and State
Water
Resources
Control Board
(Water
Boards)
Grant
Reauthorization of EPA’s OSG grant program, which serves to provide funding for the planning, design, or construction of critical stormwater infrastructure projects in communities including combined sewer overflows (CSO) and sanitary sewer overflows (SSO). Grants will be awarded to states, which will then provide sub‐awards to eligible entities for projects that address infrastructure needs for CSOs, SSOs, and stormwatermanagement. States are required to prioritize funding projects for communities that are financially distressed, have a long‐term municipal CSO or SSO control plan, or for projects that have requested a grant on their CWSRF Intended Use Plan. Program budget to provide $280 million annually for the fiscal years 2022 through 2026.
California’s allotment from the OSG program is 10.6% of the nationwide federal appropriations. Based on the federal appropriations for 2020, 2021, and 2022, California will be eligible to apply for and receive grant funds of approximately $10‐12 million.
Funds have been allocated to 3 projects in FY22, but approximately $10 million is expected next fiscal year.
$5 million cap, with 10% match for small, severely DAC; 20% for small DAC; and 50% for others.
Link: https://www.epa.gov/cwsrf/sewer‐overflow‐and‐stormwater‐reuse‐ municipal‐grants‐program
Discuss project with WaterBoards in December or January.
[email protected]
.gov
High Priority
Funding for the program is small, but the City is a
good fit for the program’s goals. Funding
appropriations anticipated to increase in future
years.
Storm WaterGrant Program
State Water
Resources
Control Board
(Water
Boards)
Grant
Funds for multi‐benefit storm water management projects including greeninfrastructure, rainwater and storm water capture projects and stormwater treatment facilities. Storm Water Resource Plans, or functionallyequivalent plan(s), are required to obtain grant funds for storm water anddry weather capture projectsApproximately $200 million in funds were provided by Proposition 1. Allavailable funding has been distributed. Applications are closed.
[email protected]
Future Priority.
City’s Projects are eligible, however program is no
longer accepting new applications but may reopen
at a later date pending appropriations.
11.a
Packet Pg. 445
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 446
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) DRAFT | NOVEMBER ͮͬͮͮ | H‐Ͳ
Program Agency Type Description Deadlines/Next Steps Constraints Priority IntegratedRegional WaterManagementGrant Programs
(IRWM)
State Water
Resources
Control Board
(Water
Boards)
Grant
The Integrated Regional Water Management (IRWM) program is a voluntary statewide planning and implementation program designed to incentivize regional collaboration among multiple water agencies towardsthe implementation of multi‐benefit projects. The IRWM offers grant funding to IRWM groups for projects that support integrated regional water management planning and implementation, optimize water supply and reliability, protect or improve water quality, and enhance ecosystems.
Recent grants funded by Proposition ͭ and ʹͰ.
No IRWM grant programs are currently open for stormwater projects.
SWRCB anticipates just ͈ͳ to ͈͵ million to be allocated for FYͮͮ‐ͮͯ by the EPA, enough for ͮ or ͯ projects.Link: https://water.ca.gov/Work‐With‐Us/Grants‐And‐Loans/IRWM‐Grant‐ Programs
No current deadlines. Contact
[email protected] Project must be a part of an accepted IRWM region. Project is eligible, however IRWM program funding has been fully allocated, with no new funds anticipated.
CommunityDevelopmentBlock Grant(CDBG)
California
Department
of Housing
and
Community
Development
Grant
HUD‐awarded state funds for local projects. Available to localgovernments, counties and municipalities. Eligible to fund stormwater andgreen infrastructure because these projects can create jobs, increaseeconomic activity, and increase property values.CDBG funds are provided as grants to non‐entitlement jurisdictions. Grantscan vary based on annual allocations and activity limits. Must address oneof three national objectives:
Benefit to low‐ and moderate‐income persons Aid in the prevention or elimination of slums and blight, or To meet an urgent need Link: https://www.hcd.ca.gov/community‐development‐block‐grant‐program Guidelines are being updated.
Not Eligible
The City’s community demographics are not a
good fit for the program.
11.a
Packet Pg. 447
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 448
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan) DRAFT | NOVEMBER ͮͬͮͮ | H‐ͳ
Program Agency Type Description Deadlines/Next Steps Constraints Priority Coastal WatershedFlood Risk
ReductionProgram
Department
of Water
Resources
(DWR)
Grant
Program established in 2017 and funds projects in coastal areas that focus on multi‐benefit flood risk reduction. These projects will:
Address flood risk and public safety
Enhance coastal ecosystems, including fish and wildlife habitat enhancement
Promote natural resources stewardship and public access corridors
Eligible projects must be in areas that intersect the California Coast or San Francisco Bay. $27 million in funding is available for the program until 2024. $23.9 million awarded in grant funding in July 2021 .
Link: https://water.ca.gov/Work‐With‐Us/Grants‐And‐Loans/Coastal‐ Watershed‐Flood‐Risk‐Reduction
No planned deadlines upcoming.
Contact Ke Zhong
at [email protected]
Sami Nall, Program Manager,
at [email protected]
Future Priority
Current funds have been allocated. If the
Legislature places new funds into the program,
this program could be a good opportunity for the
City.
FloodplainManagement,Protection andRisk Awareness(FMPRA) GrantProgram Department
of Water
Resources
(DWR)
Grant
Established in 2019, the program supports local agency efforts to preparefor flooding by providing financial assistance for flood risk reductionactivities related to stormwater flooding, mudslides, and flash floods.DWR awarded $50.4 million in for the five planning and monitoring and 13implementation projects in 2022. Applications are currently closed.Link: https://water.ca.gov/Work‐With‐Us/Grants‐And‐Loans/Flood‐Management‐Protection‐Risk‐Awareness‐Program No planned deadlines upcoming.Contact [email protected] Low Priority
Based on City’s project types and goals of the
grant program, there is a low probability of a
successful award.
Water and Waste
Disposal Loans
and Grants
California/
USDA Rural
Development
Loan/Grant
Funding for clean and reliable drinking water systems, sanitary sewage disposal, sanitary solid waste disposal, and stormwater drainage to households and businesses in eligible rural areas with populations of ͭͬ,ͬͬͬ or less. Most state and local governmental entities, nonprofits and tribes are eligible.
Up to Ͱͬ‐year payback period, interest rates, based on the need for the project and the median household income of the area to be served. If funds are available, a grant may be combined with a loan if necessary to keep user costs reasonable.Links: https://www.rd.usda.gov/ca https://www.rd.usda.gov/programs‐services/water‐environmental‐programs/water‐waste‐disposal‐loan‐grant‐program/ca Applications accepted on an on‐
going basis.
Contact Luis Andrade; WaterEnvironmental Program Director (ͳͲͬ) ͯͱͱ‐ͮͮͬʹ ext. ͭͬʹ [email protected]
All facilities receiving federal financing must
be used for a public purpose.Partnerships with other federal, state, local, private and nonprofit entities that offer
financial assistance are encouraged.
Projects must be financially sustainable.
Not eligible
City demographics do not match program goals.
11.a
Packet Pg. 449
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
11.a
Packet Pg. 450
Attachment: Exhibit A - 2022 Storm Drainage Master Plan (5210 : 2022 Storm Drainage Master Plan)
CITY OF PACIFICA
COUNCIL AGENDA SUMMARY REPORT
12/12/2022
1 SUBJECT:
Public-Private Partnership Feasibility Analysis Next Steps RECOMMENDED ACTION:
Hear a presentation on the results of a conceptual public-private partnership feasibility analysis involving the City’s corporation yard on Milagra Avenue and the Pacifica School District’s administrative offices on Reina del Mar Avenue, and provide direction to the City Manager about next steps.
STAFF CONTACT:
Kevin Woodhouse, City Manager
(650) 738-7409
[email protected]
BACKGROUND/DISCUSSION:
During City Council’s consideration and approval of the Civic Center Campus renovation project in 2021, Councilmember O’Neill expressed interest in evaluating the feasibility of a publicprivate partnership involving aging City facilities, Pacifica School District facilities, and affordable housing. Understanding the complexity and long timeline for such public-private partnerships compared to the immediate and more urgent timeline for renovation of the Civic Center, the City Council supported the idea of exploring whether another aging and inadequate City facility - the municipal corporation yard on Milagra Avenue - might be a candidate for a partnership with the Pacifica School District (PSD) and their administrative offices on Reina del Mar Avenue, to create new PSD administrative offices and affordable housing units at the Milagra site and a combined PSD and municipal corporation site and City Public Works Department-Field Services offices at the Reina del Mar site.
On October 25, 2021, City staff, Pacifica School District (PSD) staff, Councilmember O’Neill, Mayor Pro Tem Bier, and PSD Board Trustees Bredall and Brocchini met via Zoom to discuss the concept of such a potential public-private partnership project. Although PSD representatives communicated that seeking new Administrative Offices was not the highest priority at that time for them compared to responding to COVID-19 variant challenges and focusing on their Oddstad Avenue workforce housing project, they generally expressed support for beginning to explore the concept, understanding that public-private partnerships are complex and take many years to assess and structure.
At the January 24, 2022 City Council meeting, the City Council approved an item to direct the City Manager to solicit consultant services for a low-cost (up to $15,000) preliminary feasibility assessment based on initial basic information about the City and PSD properties and operational needs. The preliminary scope of work would be focused to assess basic assumptions and financial feasibility of a potential project in order for the City Council and the PSD Board of Trustees to make a more informed decision about next steps. PSD was 12 Packet Pg. 451
Pacifica City Council 2
December 12, 2022
supportive of conducting this assessment, however due to COVID-19 variant response, other priority PSD projects, and upcoming annual budget development, their preference was to pursue this assessment during an August to December timeframe. Therefore, during summer 2022, City staff developed a Request for Proposals with PSD input to solicit consultant services for this assessment.
The City received two responsive proposals and selected Willdan Financial Services for the assessment. Willdan’s Draft Conceptual PPP Feasibility Analysis is provided in Attachment A.
Willdan’s work began in November and included meetings with City and PSD staff, affordable and market rate housing developers, and analysis of site characteristics and the range of practical and legal issues necessary to understand the broad feasibility of the contemplated land transaction and the extent to which private development on the City site could assist with the funding of improvements, such as District Offices on the City property and the new/renewed corporation yard on the District property. Their analysis addresses specific details and constraints of each of the properties, identifies policy and practical considerations, discusses current residential development economics, identifies three basic development alternatives for the City site, discusses the District site, and concludes with a list of outstanding issues, potential next steps, and rough order of magnitude identification of timeline factors for future steps.
In summary, Willdan concludes that “based on this rough analysis the development of the City site appears to be feasible as an affordable housing and District office project.” However, there are many variables that need to be addressed with further analysis, the first being a “fit study” by an architect or similar professional to understand the City site in more detail and how residential, office, and parking could be accommodated, number of units, etc.. This information would further inform financial feasibility for an affordable housing developer as well.
Willdan representatives will present the results of their analysis at the City Council meeting.
Following the presentation, questions and answers from the Council, and public comment, the City Manager is seeking direction from the City Council on next steps. Because the PSD Board of Trustees has not yet discussed this analysis, the City Manager recommends that the City Council’s direction include, and be contingent on, the PSD Superintendent receiving affirmative interest from the PSD Board of Trustees to continue this analysis into the next “fit study” phase.
It is anticipated the City would pay for the estimated up to $10,000 cost of the next phase, however the City Manager is also seeking Council input on this point.
ALTERNATIVE ACTION:
A second phase of this assessment is not currently on the City Council Priorities list for Fiscal Year 2022-23. The City Council could choose to defer its decision on funding a second phase of this study to Council’s goal-setting for FY2023-24 priorities and FY2023-24 budget development.
RELATION TO CITY COUNCIL GOALS AND WORK PLAN:
A public-private partnership with Pacifica School District concerning City and PSD facilities and affordable housing relates primarily to the Council’s goals of Fiscal Sustainability and Strong City Workforce Infrastructure.
FISCAL IMPACT:
Approval of a second phase of this assessment, an architectural “fit study,” is estimated to cost 12 Packet Pg. 452
Pacifica City Council 3
December 12, 2022
up to $10,000 depending on the rigor of the analysis and complexities that may arise.
ORIGINATED BY:
City Manager's Office
ATTACHMENT LIST:
Willdan Financial Services Draft Conceptual PPP Feasibility Analysis (PDF) 12 Packet Pg. 453
Draft Memorandum
To: City of Pacifica
From: James Edison and Molly McKay, Willdan Financial Services Date: December 6, 2022
Re: DRAFT Conceptual PPP Feasibility Analysis
The City of Pacifica (“City”) has engaged Willdan to examine the feasibility of a potential land exchange and PPP between the City and the Pacifica School District (“District”). The City’s current corporation yard is located at 151 Milagra Avenue (the “City Site”) and is space-constrained and not particularly compatible with neighboring uses. The District has a site at 375 Reina del Mar Avenue (the “School Site”) that contains its current administrative offices and a limited corporation yard for district vehicles. The City and District wish to explore the possibility to redevelop the City’s corporation yard site and public works offices as a mixed-use development that contains affordable housing and administrative offices for the District and redevelop the current school district site as a corporation yard that serves both the City and the District, along with offices for public works. Willdan understands that there is no funding available for the project other than some affordable housing funds.
Willdan has spent the past two weeks talking to City and District staff, affordable and market rate housing developers, and analyzing the site characteristics and a range of practical and legal issues to understand the broad feasibility of the contemplated land transaction and the extent to which private development on the City site could assist with the funding of contemplated improvements such as District offices and the new/renewed corporation yard on the District site.
City Public Works/Corporation Yard Site (151 Milagra)
The City site comprises approximately 0.75 acres, or 33,000 square feet, and is located at the southern end of a strip of commercial properties along both sides of Highway 1. It is rectangular in shape, slightly wider at the southern end than the northern end. It has a walk score of 81/100, with good availability of services and transit nearby and a good candidate for higher density residential development, especially where residents are more dependent on transit and walking.
The site currently contains the City’s public works offices and corporation yard. Fueling and heavy maintenance are done elsewhere. It is severely constrained and inadequate for its current purpose, with material storage offsite and equipment left outside that should be sheltered. City staff have also indicated that its current location is not a good fit given the area and surrounding homes and businesses.
12.a
Packet Pg. 454 Attachment: Willdan Financial Services Draft Conceptual PPP Feasibility Analysis (5222 : Public-Private Partnership Feasibility Analysis Next December 6, 2022 DRAFT PPP Analysis
The site has a 54” storm drainpipe running underneath from east to west and then to the ocean. In Willdan’s experience such a pipe often cannot be covered by a structure such as a building, and therefore any development must include an easement over it (with a use such as parking) or the pipe must be relocated to a site where it can be accessed for maintenance and repair, such as adjacent right of way.
In the City General Plan the site is zoned C-2 (Community Commercial), which allows housing above ground-level commercial (including office) at 21.8 units per acre. Height is limited to 35 feet. To accommodate the likely density needed for feasibility (67 units per acre or higher) the General Plan land use designation must be changed to allow higher density, such as Mixed Use Center, or the City could create a new land use designation to accommodate both higher density and lower parking requirements.1 As will be discussed below, for the site to be feasible as a multifamily residential site the limit will likely need to be increased to five stories.
School District Site (375 Reina del Mar)
The District site contains its current administrative office and corporation yard and comprises approximately 69,000 square feet, or 1.6 acres, according to the District’s facilities master plan. The school district offices total approximately 11,000 square feet, and the District has indicated that it need only replace that space, not expand it.2 The site also includes shop space for the corporation yard of approximately 6,600 square feet. The District’s corporation yard is mostly storage and administration, with fueling and maintenance performed offsite. The District site has a walk score of 51, with limited access to services and transit.
A facility master plan prepared by the District indicates that the offices are in fairly good condition and have over 10 years of useful life remaining.
On the northern edge of the District site is the Calara Creek that may pose a challenge to redevelopment. Current City policy calls for a buffer of one hundred feet, which may restrict development or other improvements such as surface improvements. Willdan assumes that existing structures can stay, but it is not clear to what extent existing structures can be modified or improved.
A portion of the District site is also used for drop-off and pick-up for the adjacent Vallemar Elementary School and City-operated childcare. Willdan expects that any changes to the District site may need to accommodate that continuing use, which will restrict the amount of land available to accommodate a larger corporation yard. 1 City staff have also indicated that the State Density Bonus Law may allow the project to proceed without zoning amendments.
2 The District facilities master plan indicates that staff expressed interest in some improvements, such as ADA access, HVAC improvements, and ESS Building safety egress.
12.a
Packet Pg. 455 Attachment: Willdan Financial Services Draft Conceptual PPP Feasibility Analysis (5222 : Public-Private Partnership Feasibility Analysis Next December 6, 2022 DRAFT PPP Analysis
Policy and Practical Considerations
Conceptually, the proposed transaction makes sense. The City site is a better location for an office and is also a desirable site for higher density residential development. The City site is too small for its current use as a corporation yard. Both the City and District have expressed interest in consolidating their corporation yard functions on the District site. The City site offers the opportunity to increase housing supply, including affordable housing.
Overall, there are a few practical considerations/requirements applicable to any development alternative:
1. Replacement of public works offices currently located on the City site (14,000 square feet),
2. District office currently located on the District site (11,000 square feet),
3. Corporation yard functions for both the City and the District to be located on District site,
4. Existing stormwater pipe under the City site,
5. Limited food service transportation and storage which is currently handled at the District site, and
6. Surplus Lands Act.
3 Residential Development Economics
Willdan has contacted several market rate and affordable residential developers to get a broad sense of the current environment and prospects for the City site.
The Bay Area has seen historic increases in construction costs over the past few years, which are currently very high. Current construction costs have rendered market-rate multi-story residential development infeasible in all but the most expensive markets (such as San Francisco). More generally, to be feasible such projects also require significant scale (several acres typically) which is more than the land available for the contemplated project. Willdan believes that the current situation reflects a disequilibrium caused by a combination of extreme fiscal stimulus and COVID-related supply chain and labor effects, and that these factors will balance out in coming years as the economy adjusts to a new equilibrium.
But even in the medium to long term for market rate development the densest construction likely to be feasible on the City site would be Type V construction, which is typically up to four stories of wood frame, and potentially a concrete podium to accommodate parking, which would yield approximately 30-50 units (depending on the unit size and parking requirements).4
3 Willdan is not an expert on the Surplus Lands Act but notes it because it came up in discussions with City staff and understands that it poses a potential constraint on disposition of the land. 4 It is important to note that these numbers are very rough, and some design work will be necessary to understand the site and how development would fit with constraints such as ingress/egress, parking, height restrictions and other factors (such as an easement for the storm drain) taken into account.
12.a
Packet Pg. 456 Attachment: Willdan Financial Services Draft Conceptual PPP Feasibility Analysis (5222 : Public-Private Partnership Feasibility Analysis Next December 6, 2022 DRAFT PPP Analysis
Single family residential development is likely still feasible on the site but would not yield many units and might not yield significant land value.
5 Affordable housing remains broadly feasible in the Bay Area largely because the financing and subsidies of affordable housing are based on development costs and therefore increased construction costs can be accommodated with increased funding/subsidies.
In discussions with affordable housing developers Willdan has been told that the site is favorable and likely to receive the subsidy necessary to make it feasible. The land is located within what is known as a “high opportunity zone” and therefore can likely compete effectively for affordable housing funding. Affordable housing developers expressed concern about the size of the site, the proximity of Highway 1, and environmental issues given its use as a corporation yard.
Affordable housing developers also expressed support for the notion that a project could accommodate school district offices but expressed concern about on-site parking requirements and how such space could fit into an affordable housing transaction.6 Willdan also explored the notion of a mixed-use development with market rate and affordable units. The developers Willdan spoke to expressed doubt that the project had enough scale to make that feasible, both because of the likely economics of the project and the limited number of affordable units it would include. One way it might work would be in the case of a townhome project in which several of the town homes are dedicated to moderate income households, through a deed restriction or other mechanism.
Generally, the affordable housing developers indicated that a project of at least 50 units would be necessary to be suitable for development and operation. To achieve this number of units it might be necessary to limit unit size and might suggest designation as senior housing (which typically has smaller units and therefore can accommodate a higher unit count for a given site).
Common in all discussions with the developers was that for the City site project to work it will be necessary to limit uncertainty as much as possible. This includes getting environmental clearance for the City site, establishing all the necessary zoning in advance, getting neighbor and stakeholder support, and ensuring that the District and City are fully supportive of both the disposition of the City site and the disposition of the District site. 5 Willdan’s recent work on the City’s impact fees estimated that land in the City is generally worth $1.4 million per acre. Considering the relative favorability of the site combined with the need for demolition and environmental clearance $1 million may be a reasonable estimate of the residual land value of the site and therefore its value as a single-family development project. 6 Possible conceptual alternatives were either selling the space as a condo to the District for a nominal amount or a lease/leaseback arrangement in which the affordable housing developer leases the land on a long-term basis and leases the office space back to the District.
12.a
Packet Pg. 457 Attachment: Willdan Financial Services Draft Conceptual PPP Feasibility Analysis (5222 : Public-Private Partnership Feasibility Analysis Next December 6, 2022 DRAFT PPP Analysis
Development Alternatives – City Site
After consultation with the City, District, and individuals in the development community, Willdan has identified three basic development alternatives for the City site that include both residential units and a District office.
Market Rate Development – Townhomes
Based on a rough assessment of the site, Willdan believes that it would be feasible to construct 10 townhomes on the site, along with a headquarters for the District of approximately 11,000 sf (including the associated required parking). Willdan believes that the townhome development would yield a value of approximately $1 million for the associated land, which should be sufficient to construct the desired new school administrative offices and associated parking. As an alternative the City could designate some of the townhomes as affordable housing, but this would reduce the residual land value available to fund other priorities. Also, the City could keep the public works office in place and use it for District offices. These options will require further analysis if the City sees them as promising.
Affordable Housing Development – 50+ units/acre
Based on discussions with affordable housing developers, a project of 30-50 units should be feasible (assuming the required zoning, entitlements, environmental clearance, etc.). This project may be able to accommodate space on site for a 11,000-sf headquarters for the District. An important open question is the parking requirements and whether the site could provide sufficient access and parking for both the residential units and District offices.
Mixed Use Development – 50+ units/acre
Based on discussions with developers, this alternative does not appear to be feasible at this time, primarily because of current construction costs. In the longer term, Willdan expects the balance between construction costs to return to a more favorable equilibrium but it is impossible to know when this will occur.
Development Alternatives – District Site
Given the requirements of the City and the District, Willdan has not identified a range of alternatives for the District site. Because the City site does not appear to be able to accommodate any functions beyond residential housing and the District offices, the District site must accommodate the remaining functions, including the corporation yard for the District and the City’s public works offices. In addition, the District has a food services function that should be accommodated on the District site due to the constraints of the City site. The District site will likely face some pressure to retain its function as a pick-up and drop-off space for the adjacent school, which is accommodated in the District site’s parking lot.
Additionally, Willdan understands that current City policy potentially restricts development or construction within 100 feet of the Calara Creek that runs across the northern edge of the
12.a
Packet Pg. 458 Attachment: Willdan Financial Services Draft Conceptual PPP Feasibility Analysis (5222 : Public-Private Partnership Feasibility Analysis Next December 6, 2022 DRAFT PPP Analysis
site. Willdan assumes for the purposes of this analysis that any existing structures and improvements can remain.
Given these constraints, and the lack of funding for significant construction of new facilities, Willdan believes that the best alternative for the District site is to retain the current corporation yard space and examine the onsite parking to explore whether the corporation yard can be expanded to the south to accommodate both the City and the District. The current District offices could be occupied by public works and retain the limited food storage and transportation functions currently housed there.
Outstanding Issues
Willdan’s research and discussions have yielded a few issues that require further study and analysis to understand the potential for the contemplated PPP transaction:
1. City site zoning
2. Development economics
3. Surplus Lands Act
4. Environmental Clearance
5. Calara Creek
6. City site size and constraints
7. District site operational constraints
Next Steps
This analysis is intended as an initial look and rough feasibility analysis specific to the possibility of moving the City’s public works and corporation yard functions to the site currently owned by the District and development of the City site as a mixed-use residential development with multiple residential units and space for administrative offices for the District. Based on this rough analysis the development of the City site appears to be feasible as an affordable housing and District office project. Willdan recommends the following next steps to continue the process of exploring the feasibility of the contemplated transaction:
1. Fit study to understand the City site and how a residential project, office, and parking could be accommodated, number of units, etc.7
2. Define exact City and District requirements and whether they could be accommodated on District site given need for public works offices, school drop-off, and creek restrictions
3. Site characterization (environmental issues, easements, creek setback)
4. Stakeholder evaluation
5. Potential identification of development partner (likely affordable housing developer in short to medium term)
7 Willdan estimates that such a study prepared by an architect or similar professional would be $5,000 to $10,000, depending on the rigor of the analysis and complexities that may arise.
12.a
Packet Pg. 459 Attachment: Willdan Financial Services Draft Conceptual PPP Feasibility Analysis (5222 : Public-Private Partnership Feasibility Analysis Next December 6, 2022 DRAFT PPP Analysis
Timeline
Following is a rough timeline of potential steps to follow in pursuing the contemplated transactions, in rough order but in many cases overlapping:
1. Functional and Transition Evaluations (5 months)
2. Zoning Evaluation Change (3 months)
3. Environmental Evaluation (6 months)
4. Stakeholder Outreach (3 months)
5. Functional and Transition Planning (6 months)
6. Land Transaction Documentation (4 months)
7. Developer Selection/Negotiation (6 months)
8. Predevelopment/Planning (12 months)
9. Development/Transfer of Functions (18 months)
Some of these tasks could be conducted simultaneously. Willdan estimates that the process from start to completion of the residential project and new joint corporation yard function will take at least two to three years to complete and could be more depending on issues and complexities that may arise.
12.a
Packet Pg. 460 Attachment: Willdan Financial Services Draft Conceptual PPP Feasibility Analysis (5222 : Public-Private Partnership Feasibility Analysis Next
CITY OF PACIFICA
COUNCIL AGENDA SUMMARY REPORT
12/12/2022
1 SUBJECT:
Appointment of Ad Hoc Subcommittee for Pride 2023 Event Planning RECOMMENDED ACTION:
Consider appointing a two-councilmember limited-term ad hoc subcommittee to work with Coastside Pride on the planning for 2023 Pride Celebration events in Pacifica.
STAFF CONTACT:
Kevin Woodhouse, City Manager
(650)738-7409
[email protected]
BACKGROUND/DISCUSSION:
During 2022 Mayor Bier and Councilmember Beckmeyer worked closely and regularly with Coastside Pride and other community and business representatives to plan Pacifica Pride Celebration events for June 2022. Their work has continued into fall and winter to debrief about the 2022 events and begin planning for more extensive events for 2023.
To formalize their role on a temporary basis, they are requesting the Council’s consideration of appointing them to a two-councilmember limited-term ad hoc subcommittee that will meet at least monthly and actively work with Coastside Pride and other community and business representatives to plan for Pride events in 2023. The duration of the ad hoc subcommittee is intended to extend through summer 2023, to encompass the implementation of events in June and allow time for debriefing following the events. This upcoming year’s work on planning and preparations, including potential parade logistics, is anticipated to be intensive and will lay the groundwork for future annual events, therefore formal approval by the Council of their work as an ad hoc subcommittee is being requested.
Future year’s work on Pacifica Pride event planning may be more appropriately designated as a Council Liaison assignment to a Coastside Pride/Community Group, much like the Council currently has a liaison designation to the Fog Fest Organizing Group.
ALTERNATIVE ACTION:
The Council could decide not to appoint two councilmembers to a limited-term ad hoc subcommittee.
RELATION TO CITY COUNCIL GOALS AND WORK PLAN:
This item is consistent with the Council-adopted goals of An Engaged Community and A Healthy and Compassionate Community
13 Packet Pg. 461
Pacifica City Council 2
December 12, 2022
FISCAL IMPACT:
There is no fiscal impact related to this recommendation.
ORIGINATED BY:
City Manager's Office
ATTACHMENT LIST:
13 Packet Pg. 462