Del Mar City Council Meeting Agenda
Del Mar Town Hall
1050 Camino del Mar, Del Mar, California
And via teleconference
1317 Irving Avenue, Colonial Beach, VA 22443
May 6, 2024 City Council Meeting
INFORMATION RECEIVED
AFTER THE COUNCIL AGENDA
WAS DISTRIBUTED
(“Red Dots”)
Del Mar City Council
May 6, 2024
DEL MAR
BEACH REPORT
2023
May 6, 2024
Coastal Frontiers Corporation
Item 02
OVERVIEW
➢ Background
➢ SANDAG Monitoring Program
➢ Findings
➢ Beach Nourishment
Considerations
May 6, 2024 Item 02
Study Area
Oceanside Cell
Oceanside
Carlsbad
Encinitas
Solana Beach
Del Mar
Mission Beach
Imperial
Beach
La Jolla
May 6, 2024 Item 02
Beach Nourishment
(1940-2023)
Del Mar = 183,000 cy
May 6, 2024 Item 02
Monitoring Program
History
➢ 1983-1989: CCSTWS-SD
➢ 1996-present: SANDAG + Cities
Objectives
➢ Measure Changes in Shorezone
➢ Monitor RBSP Beach Fills
➢ Document Impact of Natural
Events (e.g., El Niño)
➢ Develop Foundation for Future
Projects (beach nourish,
resiliency planning,
SLR adaption, public works)
May 6, 2024 Item 02
Beach Profiles at Transect DM-0580
May 6, 2024 Item 02
Findings
➢ Time Frames
▪ Current Condition (Fall 2023)
▪ Post-RBSP I (Fall 2000 to Fall 2023)
➢ Regions
▪ Oceanside Cell
▪ Del Mar Beaches
➢ Beach Parameters
▪ Beach Width
▪ Shorezone Volume
May 6, 2024 Item 02
Oceanside Littoral Cell
Shorezone Volume Changes
RBSP I RBSP II SELRP
May 6, 2024 Item 02
Oceanside Littoral Cell
2001 2005
May 6, 2024 Item 02
Post-RBSP I Summary in Sub-Reaches
Sub-Reach Fall 2023
Ave. MSL
Beach Width
Post-RBSP I
Shoreline
Change
2000 to 2023
Shoreline
Change Trend
2000 to 2023
Oceanside 117 ft -27 ft -2.2 ft/yr
N. Carlsbad 148 ft 51 ft +0.9 ft/yr
S. Carlsbad 91 ft -35 ft -1.8 ft/yr
Leucadia/Encinitas 121 -81 ft -3.0 ft/yr
Cardiff 184 ft 69 ft +3.9 ft/yr
Solana Beach 217 ft 109 ft +4.8 ft/yr
Del Mar 163 ft -21 ft 0.0 ft/yr
La Jolla 204 ft -5 ft 0.0 ft/yr
*sub-reaches defined in SANDAG Annual Monitoring Report May 6, 2024 Item 02
Del Mar Beach Widths
May 6, 2024 Item 02
-160
-140
-120
-100
-80
-60
-40
-20
0 20
40 60
80 100
120
140
160
180 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 MSL Beach Width Change
Shorezone Volume Change
DM-0580 to DM-0590 Ave. Change Beach Width (ft) / Shorezone Vol. (cy/ft) Year
RBSP I RBSP II
183,000 cy
SELRP
none
none
Del Mar
Average Beach Width and SZ Vol Change
Relative to Pre-RBSP I Condition
May 6, 2024 Item 02
MSL Beach Widths
May 6, 2024 Item 02
V = Δy (h* + B) L
where V = Volume
Δy = Beach Width Change
h* = Depth of Closure
B = Berm Height
L = Length of Fill
Beach Nourishment Considerations
Added (Design)
Beach Width
Sand Volume
Required *
50 ft 370,000 cy
100 ft 750,000 cy
150 ft 1.1 mcy
SLR Beach Width
Loss
Sand
Volume to
Counter *
0.5 ft 40 ft 300,000 cy
1.0 ft 85 ft 630,000 cy
*5,000 ft long beach 2.0 ft 170 ft 1.3 mcy
*5,000 ft long beach
Beach Nourishment
for Equilibrated Beach Width
Beach Nourishment
to Accommodate SLR
May 6, 2024 Item 02
SUMMARY
1. Regional Long-term Outcome
➢ RBSP I and II provided regional benefits
➢ Initial RBSP II outcome similar to RBSP I
➢ Sustained gains at N. Carlsbad, Cardiff, and Solana
2. Del Mar Long-Term Outcome
➢ Beach Width: ~ 20 ft narrower than pre-RBSPI condition ➢ Trend: Stable
May 6, 2024 Item 02
1 Melinda Gould
From: Dave Parkes <[email protected]>
Sent: Friday, May 3, 2024 2:07 PM
To: City Clerk Mail Box
Cc: Dan Quirk; Terry Gaasterland; David Druker; Dwight Worden; Tracy Martinez; [email protected]
Subject: May 6th City Council Agenda Item #3, SANDAG seawalls will block 8th street beach access - RED DOT
Attachments: 20240502_175034.jpg; 20240502_175220.jpg
Follow Up Flag: Follow up
Flag Status: Flagged
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
Dear City Council Members,
Today, May 3rd, SANDAG completed installaon of sea wall posts along the beach near 8th St. To our surprise, the new seawall will connect to the original seawall near the access trail, and appears to completely block access to the beach via this long-established and frequently used access trail (north end of exisng seawall). We have been told for several years by SANDAG that beach access will remain at both 8th and 11th Streets, however this appears not be the case at 8th St. We and dozens of other surfers, swimmers and walkers use this trail daily, and have for decades. It appears it will be completely blocked. Please see the aaches photos of the new seawall. I spoke with several of the construcon workers who were there this morning, and they also confirmed it is their understanding that there will be no gap between the new and old seawalls for beach access.
Furthermore, we were previously informed via a recent City Council Agenda Report that: “Finally, it is worth nong that the Coastal Commission’s cerficaon of the project included the direcve to place the new seawalls as close as feasible to the bluff to preserve as much beach area as possible”. This is NOT the case at 8 th St where they have closed off about
30% of prime beach area by joining up the new and old seawalls, instead of seng back the new seawall against the bluff. There is approx. 20-30 feet of beach behind the new seawall that is completely lost now.
I also found this on page 27 of the COASTAL CONNECTIONS CONCEPTUAL PLANNING STUDY “— Beach/Sand/Tide Conditions: All railroad crossing concepts would be bound on the west side by previously approved seawalls and would provide beach access through planned gaps in those seawalls, posing little or no new impacts to beach areas.” And on page 57: “Notable construction activities for the western bluffs will include materials delivery via beach; materials staging (which also is likely to require storage space on the beach); clearing vegetation; grading; constructing the path and supporting retaining walls; and constructing a beach access point at a planned seawall opening.” We imagine this is a big surprise to all of us in Del Mar, and would appreciate if SANDAG can restore access by leaving a gap between the soon-to-be-closed seawalls, so we can connue our beach access for the future.
Thanks for your aenon to this very upseng and unnecessary change to our beach access.
Dave Parkes and Barb Roland
156 Melanie Way
1 May 6, 2024 Item 03
2 May 6, 2024 Item 03
3 May 6, 2024 Item 03
Del Mar Bluffs Stabilization Project
Phase 5 Construction Update
Del Mar City Council | Item 3
Bruce Smith, Principal Design Engineer and Corridor Director May 6, 2024
May 6, 2024 Item 03
Project Area
| 2
Torrey Pines Overhead Bridge MP
245.7
Coast Boulevard
MP 244.1
May 6, 2024 Item 03
| 3
Questions We Will Answer Today
• How much excavation is being performed?
• Why is excavation needed in front of the proposed seawalls/piles? • Why is excavation needed behind the proposed seawalls/piles? • Does removing the material at the bluff toe destabilize the bluffs? • What will happen to the excavated bluff material?
• What is the construction oversight process?
• What is the permitting process and oversight?
May 6, 2024 Item 03
Seawall Installation
4 May 6, 2024 Item 03
| 5
Sand Movement is Seasonal
Summer sand level Winter sand level
May 6, 2024 Item 03
Seawall Key Map
Seawall 1
Seawall 2
Seawall 3 Seawall 4
Seawall 5 Seawall 6
| 6
May 6, 2024 Item 03
Existing Condition
| 7
May 6, 2024 Item 03
Step 1: Excavation
| 8
May 6, 2024 Item 03
Step 2: Installation of Piles
| 9
May 6, 2024 Item 03
Step 3a: Installation of Riprap and Fill
| 10
Per the permitted design plans,
grading with fill material is
proposed behind the seawalls
at a 2:1 slope to catch the bluff
mid-slope
Locations:
• Below Seagrove Park
• 13th Street to 12th Street
• Sea Orbit Lane to 11th Street
May 6, 2024 Item 03
Step 3b: Placing Fill up to Trackbed Level
| 11
Per the permitted design
plans, at two specific
locations, grading with fill
material is proposed behind
the seawall up to the track
level to ensure the
necessary slope stability.
Locations:
• Below Seagrove Park
• 12th Street
May 6, 2024 Item 03
Step 3c: Installation of Slurry
| 12
Per the permitted design plans, at locations
where the seawall is very close to the bluff
face and there isn’t enough space to place
riprap rocks behind the wall, slurry (loose
concrete mix) is proposed behind the seawall
to ensure protection from erosion.
Location:
• Seawall 6 (Anderson Canyon Area)
• Small sections of other walls
May 6, 2024 Item 03
Additional Efforts Needed at Seawall 3 (11th St)
| 13
• Torrey sandstone blocks
fallen onto beach from
upper bluff
• These blocks encroach
within the limits of proposed
Seawall 3 and needed to be
removed
• Finer material stockpiled
and larger sandstone
materials are on the beach
May 6, 2024 Item 03
Seawall 6 - Sta 1488+50 – Upper Bluff Block Failure
| 14
• Recent erosion and block
failures observed at
Seawall 6 (Winter 2024)
• Approximately 5 to 10 feet
thick (east-west) and 30 to
40 feet wide (north-south).
• The debris from the failure
encroaches within the limits
of proposed Seawall 6 and
needs to be removed
May 6, 2024 Item 03
Seawall 6 - Sta 1484+00 – Fractured Upper Bluff
| 15
• At approximately Sta. 1484+00,
fractured and potentially unstable
sandstone blocks were observed
to be 5 to 10 feet thick (east–
west) and 15 to 25 feet wide
(north–south).
• Some of these fractured
sandstone blocks continue to fall
and remaining material could fall
during the excavation and drilling
activities for Seawall 6.
May 6, 2024 Item 03
Seawall 6 - Sta 1487+00 to 1486+25 – Bluff Slide
| 16
• Mobilized and loose bluff
materials
• Localized sections of upper
bluff overhanging
• Geotechnical engineer
currently working on
recommendation
May 6, 2024 Item 03
Excavated Material
17 May 6, 2024 Item 03
Excavated
Material
| 18
Stockpiled on Site
May 6, 2024 Item 03
Excavated Bluff Material
| 19
• No bluff material has been
removed from site
• Most material will be used
as fill
• Some material has too many
fine particles and organics to
be placed on beach
• Working with CCC staff to
determine what can be
placed on beach and where
May 6, 2024 Item 03
Construction Oversight
and Permitting
20 May 6, 2024 Item 03
| 21
Construction Oversight
SANDAG Construction Management Team
• Administers the construction contract; Contractor
works to plans and specifications
– Checks and Balances:
– Perform inspections
– Quality Assurance testing
– Documents contractor activities
– Reviews submittals and ensures compliance
with contract
– Works to minimize impact to the public
• Construction contract includes all permits and
compliance requirements
May 6, 2024 Item 03
| 22
Permitting Processes
• NCTD Right of Entry Permit
— The construction contractor is required to obtain the Right-of-Entry permit directly from NCTD prior to performing work within the railroad right-of-way • Federal Coastal Consistency Certification (CCC) Obtained in June 2022 — SANDAG communicates project progress to CCC staff regularly — SANDAG communicates any changes in conditions from the approved project to CCC staff to determine if additional approval is required — SANDAG is working with CCC staff to determine if bluff material can be placed on the beach and the location of placement
• Mutual benefit to City and SANDAG to leave material on beach • Some organic material is not suitable to be used as backfill or to place on beach and must be hauled offsite
May 6, 2024 Item 03
Construction Schedule
23 May 6, 2024 Item 03
| 24
Upcoming Construction Work
• Construction schedules are fluid and subject to change, below are projections of upcoming activities:
• Seawall work to continue
— Continuing excavation and pile installation
— Installation of wood lagging and rip rap
— Grading and installation of fill behind seawalls
• Upper bluff work beginning late May
— Extended night work windows on Sunday and Monday
beginning (anticipated) on May 19
— Soil nail installation below Seagrove Park
— Installation of piles, grade beams, and tiebacks
May 6, 2024 Item 03
Future Access Improvements
25 May 6, 2024 Item 03
Del Mar Bluffs 5
Sand and Recreation Mitigation
Federal Coastal Consistency Certification Condition:
Carry out a capital improvement project to plan, design, environmentally review, and construct three coastal access and recreation features once agreed between SANDAG, NCTD, and City of Del Mar including:
• A pedestrian railroad crossing
• A beach accessway from the bluff top to the beach
• A blufftop trail between 4th St and Seagrove Park
Projects will be informed by Coastal Connections Planning Study. | 26
May 6, 2024 Item 03
Del Mar Access Improvements Estimated Timeline
| 27
Regional
Transportation
Improvement
Program
Approval
February 2024
Release
Design
RFQ
May 2024
Begin
Preliminary
Engineering &
Environmental
Clearance
July 2024
SANDAG
Board
Approval of
Budget
October 2023
Begin Final
Design
July 2025
Ready to
Advertise for
Construction
Mid-Late 2026
May 6, 2024 Item 03
28 Stay Connected with SANDAG
Explore our website
SANDAG.org
Email:
[email protected]
Follow us on social media:
@SANDAGregion @SANDAG
May 6, 2024 Item 03
1 Melinda Gould
From: Dixie Welsh <[email protected]>
Sent: Sunday, May 5, 2024 9:29 AM
To: City Clerk Mail Box
Subject: Council Mtg 5/6/24 ITEM #10
Follow Up Flag: Follow up
Flag Status: Flagged
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
Dear City Council Members,
I oppose Item #10 (File 201-16, 1202-5) installing water bottle filling stations. This will encourage encampments and
attract bikers and E-bikers, especially to Seagrove and Powerhouse Parks. We walk in these 2 parks every day and
water bottle filling stations will cause hazards to pedestrians, which are often pushed off walkways by aggressive bikers.
Thank you for your attention.
Mary D. Welsh
155. 15th St #26
Del Mar, CA92014
May 6, 2024 Item 10
1 Melinda Gould
From: Alice McNally <[email protected]>
Sent: Monday, May 6, 2024 11:02 AM
To: City Clerk Mail Box; Dave Hogan; Dwight Worden-Private; Terry Gaasterland; Tracy Martinez; Dan Quirk
Subject: RED DOT: Make our water rates more affordable..Irrigation Meters & Gray water options CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
Mayor, City Council and City Manager,
In 2023 I was billed $2817.81 for household water and $1931.64 for irrigation, for a TOTAL of $4749.45.
I cannot afford a 24% increase. This will mean an increase in rent for my tenants necessary and make affordable housing more out of reach in Del Mar.
Although I am billed as a duplex w / irrigation there are only 3-4 people on the property, the same as many single family households.
I suggest the County and Del Mar let the rate payers know that the option of an irrigation meter is available to them. Make" gray water" a choice for the irrigation. An irrigation meter has no sewer charges and would also eliminate the Clean water charge.
This would save us money and clean water.
Please continue to explore all costs effective channels.
Thank you,
Alice McNally
1332 Stratford Ct.
Del Mar, CA 92014
858-342-3244
1 May 6, 2024 Item 11