HomeMy WebLinkAbout2023-02-20_Zero Year Stormwater Inpection Memo
MEMORANDUM
Date:
02-20-2023
To:
Hal Hannula
Supervising Civil Engineer
Organization:
City of San Luis Obispo
From:
Robert Camacho
Title:
Principal Civil Engineer
Project Name:
Avila Ranch
Project Number:
0661-02-LP17
Topic:
EOR Certification of Stormwater BMP 0-year Stormwater Inspection
The purpose of this memo is to provide the City of San Luis Obispo my engineer’s statement regarding
my assessment of the overall stormwater system, since installation, for the project referred to as Avila
Ranch. Based on my knowledge of the project and my initial stormwater facility inspection, the existing
BMPs, as defined in the Annual Storm Water Maintenance Plan, was constructed per the approved
project plans and specifications. The facilities are established and working as intended. These
improvements include roadside bio-swales, motor court retention, detention pond and basins that are
designed with Bioretention Soil Mix with is designed to the State PCR requirements. Attached to this
Memo are site photos of the installed BMP facilities as well as the Annual Storm Water Maintenance
Plan.
Sincerely,
Robert Camacho
Principal
Avila Ranch
SWCP Exhibit
Avila Ranch
Operations and Maintenance Manual
Annual Storm Water Maintenance Plan
Avila Ranch
San Luis Obispo, CA.
Prepared by:
RRM Design Group
3765 S Higuera
San Luis Obispo, Ca. 93401
Outline
This annual storm water maintenance plan has been developed to be in compliance with the City of
San Luis Obispo requirements. This plan outlines the permanent facilities and site features that have
been included as part of the overall stormwater treatment and conveyance system as designed, for
the Avila Ranch subdivision in San Luis Obispo, CA. The design incorporates the necessary
improvements to adequately convey, treat and detain storm water during any rain event. The system
will require ongoing inspection and maintenance to maintain its effectiveness, as designed. It will be
the owner’s responsibility to provide this inspection and maintenance on and as needed, but no less
than once per year. Any deficiencies or damages discovered shall be repaired or mitigated in a timely
manner.
The Annual Storm Water Maintenance Plan includes the following:
Training Requirements
Exhibit 1 — Detention Pond Maintenance
Exhibit 2 — Infiltration Basin Maintenance
Exhibit 3 — Permeable Paver Maintenance
Training Requirements:
The home owner will be responsible for operation and maintenance of the biofiltration planters on
their property. The CDF/HOA is to maintain the pervious pavers and all other SCM’s. Both shall
be properly trained in storm water pollution prevention and facility maintenance. The responsible
parties shall be responsible for ensuring that all contractors and/or personnel hired to perform
actual maintenance are qualified and trained to perform the scope of maintenance they are going to
perform. Bioretention Soil Mix should be 35% mature compose and 65% sand. When required to
replace soil media, contact Central Coast Landscape Products at (805) 595-3478 or contact another
provider of BSM materials.
Reporting Requirements:
The home owner will send qualified reports to the CDF/HOA for their own private SCM’s. Forms
can be found in exhibit two of this manual. The CDF/HOA is to complete inspections of all other
SCM’s and turn in all reports to the City of San Luis Obispo.
These individuals shall be trained in the following:
· Good housekeeping procedures defined in the plans and per CASQA requirements.
· Proper maintenance of all pollution mitigation devices.
· Identifications and cleanup procedures for spills and overflows.
· Large-scale spill and hazardous material response.
· Safety concerns when maintaining devices and cleaning spills.
· Inspection requirements of all pollution mitigation devices covered in this plan.
· Hazardous Material response and notification procedures.
· If water sampling becomes necessary, the individuals collecting samples shall have adequate
training sampling procedures.
Pierce County Stormwater Maintenance Manual Page 15 Detention Ponds
3.1 Detention Pond
tormwater detention ponds ar e open basins built by excavating below
existing ground or by constructing above -ground berms (embankments).
The detention pond temporarily stores stormwater runoff during rain events and
slowly releases it through a n outlet (control structure ). Detentio n ponds are
typically designed to completely drain within 24 hours after the completion of a
storm event. Components that are typically associated with a detention pond
include the following: control structure/flow restrictor, debris barrier (e.g. trash
r ack), energy dissip aters, access road, and fence.
Pierce County Stormwater Maintenance Manual Page 16 Detention Ponds Checklist
3.1 Detention Pond Checklist
Date
Frequency
Drainage
System
Feature
Problem Conditions to Check For Conditions That
Should Exist
MONTHLY ,
STORM General Trash & Debris
Any trash and de bris which
exceed 5 cubic feet per 1,000
square feet (this is about equal
to the amount of trash it would
take to fill up one standard size
garbage can). In general, there
should be no visual evidence of
dumping. If less than threshold
all trash and debr is will be
removed as part of next
scheduled maintenance.
Trash and debris
cleared from site.
ANNUAL General
Poisonous
Vegetation and
noxious weeds
Any poisonous or nuisance
vegetation which may constitute
a hazard to maintenance
personnel or the pub lic. Any
evidence of noxious weeds as
defined by State or local
regulations. (Apply
requirements of adopted IPM
policies for the use of
herbicides).
No danger of
poisonous vegetation
where maintenance
personnel or the public
might normally be.
(Coordinate with local
health department)
Complete eradication
of noxious weeds may
not be possible.
Compliance with State
or local eradication
policies required
MONTHLY ,
STORM General Contaminants
and Pollution
Any evidence of oil, gasoline,
contaminants or o ther pollutants
No contaminants or
pollutants present.
(Coordinate
removal/cleanup with
local water quality
response agency).
MONTHLY General Rodent Holes
Any evidence of rodent holes if
facility is acting as a dam or
berm, or any evidence of water
p iping through dam or berm via
rodent holes.
Rodents destroyed and
dam or berm repaired.
(Coordinate with local
health department;
coordinate with
Ecology Dam Safety
Office if pond exceeds
10 acre -feet.)
MONTHLY General Beaver Dams Dam results in chan ge or
function of the facility.
Facility is returned to
design function.
(Coordinate trapping of
beavers and removal
of dams with
appropriate permitting
agencies)
ANNUAL General Insects
When insects such as wasps
and hornets interfere with
maintenanc e activities.
Insects destroyed or
removed from site.
Apply insecticides in
compliance with
adopted IPM policies.
ANNUAL General
Tree Growth
and Hazard
Trees
Tree growth does not allow
maintenance access or
interferes with maintenance
activity (i .e., slope mowing, silt
removal, vacto ring, or
equipment movements). If trees
are not interfering with access
or maintenance, do not remove .
Trees do not hinder
maintenance activities.
Harvested trees should
be recycled into mulch
or other beneficial
uses (e.g., alders for
firewood).
Detention Pond Checklist (Continued)
Pierce County Stormwater Maintenance Manual Page 17 Detention Ponds Checklist
Date
Frequency
Drainage
System
Feature
Problem Conditions to Check For Conditions That
Should Exist
ANNUAL General
If dead, diseased, or dying trees
are identified (Use a certified
Arborist to determine health of
tree or removal requirements)
Remove hazard Trees
MONTHLY Side Slopes of Pond Erosion
Eroded damage o ver 2 inches
deep where cause of damage is
still present or where there is
potential for continued erosion.
Slopes should be
stabilized using
appropriate erosion
control measure(s);
e.g., rock
reinforcement, planting
of grass, compaction.
MONTHLY ,STORM
Side Slopes of Pond Any erosion observed on a
compacted berm embankment.
If erosion is occurring
on compacted berms a
licensed civil engineer
should be consulted to
resolve source of
erosion.
MONTHLY Storage
Area Sediment
Accumulated sediment that
exceeds 10% (typically 6” to
12”) of the designed pond depth
unless otherwise specified or
affects inletting or outletting
condition of the facility.
Sediment cleaned out
to designed pond
shape and depth; pond
reseeded if necessary
to control erosion.
MON THLY Storage
Area Liner (If
Applicable)
Liner is visible and has more
than three 1/4 -inch holes in it.
Liner repaired or
replaced. Liner is fully
covered.
ANNUAL Pond Berms (Dikes) Settlements
Any part of berm which has
settled 4 inches lower tha n the
design elevation. If settlement
is apparent, measure berm to
determine amount of settlement.
Settling can be an indication of
more severe problems with the
berm or outlet works. A
licensed civil engineer should be
consulted to determine the
source of the settlement.
Dike is built back to
the design elevation.
ANNUAL
Pond
Berms
(Dikes)
Piping
Discernable water flow through
pond berm. Ongoing erosion
with potential for erosion to
continue. (Recommend a
Goethechnical engineer be
called in to in spect and evaluate
condition and recommend repair
of condition.
Piping eliminated.
Erosion potential
resolved.
Detention Pond Checklist (Continued)
Pierce County Stormwater Maintenance Manual Page 18 Detention Ponds Checklist
Date
Frequency
Drainage
System
Feature
Problem Conditions to Check For Conditions That
Should Exist
ANNUAL
Emergency
Overflow/
Spillway
Tree Growth
Tree growth on emergency
spillways creates blockage
problems and may cause failure
of the b erm due to uncontrolled
overtopping.
Trees should be
removed. If root
system is small (base
less than 4 inches) the
root system may be
left in place.
Otherwise the roots
should be removed
and the berm restored.
A licensed civil
engineer should be
consul ted for proper
berm/spillway
restoration.
ANNUAL Emergency Overflow/ Spillway
Emergency
Overflow/
Spillway
Only one layer of rock exists
above native soil in area five
square feet or larger, or any
exposure of native soil at the top
of out flow path o f spillway.
(Rip -rap on inside slopes need
not be replaced.)
Rocks and pad depth
are restored to design
standards.
If you are unsure whether a problem exists, please contact a Professional Engineer.
Comments:
Key:
(MONTHLY) Monthly from Novem ber through April.
(ANNUAL) Once in late summer (preferable September)
(STORM) After any major storm (use 1 -inch in 24 hours as a guideline).
Pierce County Stormwater Maintenance Manual Page 19 Infiltration Facilities
3.2 Infiltration /Retention Pond
t ormwater infiltration ponds are open basins built by excavating below
existing ground or by c onstructing above-ground berms
(embankments). Like the detention pond, the infiltration pond
temporarily stores stormwater runoff during rain events, but unlike the detention
pond, the infiltration pond does not discharge to a downstream co nveyance
system or nearby surface water. In stead, the infiltration pond relies on the
ability of the site ‟s soils to absorb the stormwater into the ground. Components
that are typically associated with a retention pond include the following: energy
dissi p aters, access road, and fence.
Pierce County Stormwater Maintenance Manual Page 20 Infiltration Facilities Checklist
3.2 Infiltration/ Retention Pond Checklist
Frequency
Drainage
System
Feature
Problem Conditions to Check For Conditions That Should
Exist
MONTHLY,
STORM General
Trash & Debris
Any trash and debris which
exceed 5 cubic feet per 1,000
square feet (this is about
equal to the amount of trash it
would take to fill up one
standard size garbage can).
In general, there should be no
visual evidence of dumping.
If less than threshold all trash
and debris will be removed as
part of next scheduled
maintenance.
Trash and debris cleared
from site.
ANNUAL General
Poisonous
Vegetation and
noxious weeds
Any poisonous or nuisance
vegetation which may
constitute a hazard to
maintenance personnel or the
public. Any evidence of
noxious weeds as defined by
State or local regulations.
(Apply requirements of
adopted IPM policies for the
use of herbicides).
No danger of poisonous
vegetation where
maintenance personnel
or the public might
normally be. (Coordinate
with local health
department) Complete
eradication of noxious
weeds may not be
possible. Compliance
with State or local
eradication policies
required
MONTHLY,
STORM General
Contaminants and
Pollution
Any evidence of oil, gasoline,
contaminants or other
pollutants
No contaminants or
pollutants present.
(Coordinate
removal/cleanup with
local water quality
response agency).
MONTHLY General
Rodent Holes
Any evidence of rodent holes
if facility is acting as a dam or
berm, or any evidence of
water piping through dam or
berm via rodent holes.
Rodents destroyed and
dam or berm repaired.
(Coordinate with local
health department;
coordinate with Ecology
Dam Safety Office if pond
exceeds 10 acre-feet.)
MONTHLY General
Beaver Dams Dam results in change or
function of the facility.
Facility is returned to
design function.
(Coordinate trapping of
beavers and removal of
dams with appropriate
permitting agencies)
ANNUAL General
Insects
When insects such as wasps
and hornets interfere with
maintenance activities.
Insects destroyed or
removed from site. Apply
insecticides in
compliance with adopted
IPM policies.
MONTHLY Storage
Area
Sediment
Water ponding in infiltration
pond after rainfall ceases and
appropriate time allowed for
infiltration. (A percolation test
pit or test of facility indicates
facility is only working at 90%
of its designed capabilities. If
two inches or more sediment
is present, remove).
Sediment is removed
and/or facility is cleaned
so that infiltration system
works according to
design.
MONTHLY
Filter Bags
(if
applicable)
Filled with Sediment
and Debris
Sediment and debris fill bag
more than ½ full.
Filter bag is replaced or
system is redesigned.
Infiltration/ Retention Pond Checklist (Continued)
Pierce County Stormwater Maintenance Manual Page 21 Infiltration Facilities Checklist
Frequency
Drainage
System
Feature
Problem Conditions to Check For Conditions That Should
Exist
MONTHLY,
STORM Rock Filters
Sediment and Debris
By visual inspection, little or
no water flows through filter
during heavy rain storms.
Gravel in rock filter is
replaced.
MONTHLY
Side
Slopes of
Pond
Erosion
Eroded damage over 2 inches
deep where cause of damage
is still present or where there
is potential for continued
erosion.
Slopes should be
stabilized using
appropriate erosion
control measure(s); e.g.,
rock reinforcement,
planting of grass,
compaction.
ANNUAL
Pond
Berms
(Dikes)
Settlements
Any part of berm which has
settled 4 inches lower than
the design elevation. If
settlement is apparent,
measure berm to determine
amount of settlement.
Settling can be an indication
of more severe problems with
the berm or outlet works. A
licensed civil engineer should
be consulted to determine the
source of the settlement.
Dike is built back to the
design elevation.
ANNUAL
Pond
Berms
(Dikes)
Piping
Discernable water flow
through pond berm. Ongoing
erosion with potential for
erosion to continue.
(Recommend a
Goethechnical engineer be
called in to inspect and
evaluate condition and
recommend repair of
condition.
Piping eliminated.
Erosion potential
resolved.
ANNUAL
Emergency
Overflow/
Spillway
Tree Growth
Tree growth on emergency
spillways creates blockage
problems and may cause
failure of the berm due to
uncontrolled overtopping.
Trees should be removed.
If root system is small
(base less than 4 inches)
the root system may be
left in place. Otherwise
the roots should be
removed and the berm
restored. A licensed civil
engineer should be
consulted for proper
berm/spillway restoration.
ANNUAL
Emergency
Overflow/
Spillway
Emergency Overflow/
Spillway
Only one layer of rock exists
above native soil in area five
square feet or larger, or any
exposure of native soil at the
top of out flow path of
spillway. (Rip-rap on inside
slopes need not be replaced.)
Rocks and pad depth are
restored to design
standards.
MONTHLY
Pre-settling
Ponds and
Vaults
Facility or sump filled
with Sediment and/or
debris
6" or designed sediment traps
depth of sediment. Sediment is removed.
If you are unsure whether a problem exists, please contact a Professional Engineer.
Comments:
Key:
(MONTHLY) Monthly from November through April.
(ANNUAL) Once in late summer (preferable September)
Infiltration/ Retention Pond Checklist (Continued)
Pierce County Stormwater Maintenance Manual Page 22 Infiltration Facilities Checklist
(STORM) After any major storm (use 1-inch in 24 hours as a guideline).
Pierce County Stormwater Maintenance Manual Page 23Closed Detention Systems (Tanks/Vaults) Checklist
3.3 Closed Detention Systems (Tanks/Vaults)
losed detention systems function similar to detention ponds with the
temporary storage volume pr ovided by an underground structure to
regulate the storm discharge rate from the site . The structure is
typically constructed of large diameter pipe (48” diameter or greater) or a
concrete box (Vault). These systems are typically utilized for sites that do not
have space avail able for an above -ground system and are more commonly
associated with commercial sites.
Underground detention systems are a n enclosed space where ha rmful
chemicals and vapors can accumulate. Therefore, the inspection and
maintenan ce of these facilities should be conducted by an individual with
training and certification in working in hazardous confined spaces.
3.3 Closed Detention Systems (Tanks/Vaults) Checklist
Pierce County Stormwater Maintenance Manual Page 24Closed Detention Systems (Tanks/Vaults) Checklist
Date
Frequency
Drainage
System
Feature
Problem Conditions to Check For Conditions That Should
Exist
MONTHLY Storage
Area Plugged Air Vents
One-half of the cross
section of a vent is
blocked at any point or the
vent is damaged.
Vents open and
functioning.
MONTHLY Storage
Area Debris and
Sediment
Accumulated sediment
depth exceeds 10% of the
diameter of the storage
area for ½ length of
storage vault or any point
depth exceeds 15% of
diameter. (Example: 72-
inch storage tank would
require cleaning when
sediment reaches depth of
7 inches for more than 1/2
length of tank.)
All sediment and
debris removed from
storage area.
ANNUAL Storage
Area Joints Between
Tank/Pipe Section
Any openings or voids
allowing material to be
transported into facility.
(Will require engineering
analysis to determine
structural stability).
All joint between
tank/pipe sections are
sealed.
ANNUAL Storage
Area Tank Pipe Bent
Out of Shape
Any part of tank/pipe is
bent out of shape more
than 10% of its design
shape. (Review required
by engineer to determine
structural stability).
Tank/pipe repaired or
replaced to design.
ANNUAL Storage
Area
Vault Structure
Includes Cracks in
Wall, Bottom,
Damage to Frame
and/or Top Slab
Cracks wider than 1/2-inch
and any evidence of soil
particles entering the
structure through the
cracks, or
maintenance/inspection
personnel determines that
the vault is not structurally
sound.
Vault replaced or
repaired to design
specifications and is
structurally sound.
ANNUAL Storage
Area
Cracks wider than 1/2-inch
at the joint of any
inlet/outlet pipe or any
evidence of soil particles
entering the vault through
the walls
No cracks more than
1/4-inch wide at the
joint of the inlet/outlet
pipe.
ANNUAL Manhole Cover Not in Place
Cover is missing or only
partially in place. Any
open manhole requires
maintenance.
Manhole is closed.
ANNUAL Manhole
Locking
Mechanism Not
Working
Mechanism cannot be
opened by one
maintenance person with
proper tools. Bolts into
frame have less than 1/2
inch of thread.
Mechanism opens with
proper tools.
Pierce County Stormwater Maintenance Manual Page 25Closed Detention Systems (Tanks/Vaults) Checklist
Date
Frequency
Drainage
System
Feature
Problem Conditions to Check For Conditions That Should
Exist
ANNUAL Manhole Cover Difficult to
Remove
One maintenance person
cannot remove lid after
applying normal lifting
pressure. Intent is to keep
cover from sealing off
access to maintenance.
Cover can be removed
and reinstalled by one
maintenance person.
ANNUAL Manhole Ladder Rungs
Unsafe
Ladder is unsafe due to
missing rungs,
misalignment, not securely
attached to structure wall,
rust, or cracks.
Ladder meets design
standards. Allows
maintenance person
safe access.
If you are unsure whether a problem exists, please contact a Professional Engineer.
Comments:
Key:
(MONTHLY) Monthly from November through April.
(ANNUAL) Once in late summer (preferable September)
(STORM) After any major storm (use 1-inch in 24 hours as a guideline).
BUMPBUMPUUSTA. 27+66±10.5± R7
BASIN 1DBASIN 1EWater Treatment Basin DetailN:\0601\0661-02-LP17-Avila-Ranch-Ph1-Con-Docs\Engineering\ConDocs\Hydro\O&M\Basin Exhibit.dwg, Basin Detail, Feb 03, 2023 4:40pm, jewilson
FEBRUARY 2023AVILA RANCH0661-02-LP17ON-SITE TREATMENT/RETENTION AREA12"30"COBBLE ORSPLASH BLOCKWHERE STORMWATER ENTERS3" MULCHFLAT BOTTOMNO SLOPES3:1MAXGRAVELSTORAGEBIORETENTION SOIL MIX6"OVERFLOW / OUTLET STRUCTURECONNECT TOADJACENT STORMDRAIN MAINLINETYPICAL WATER TREATMENT BASINNTS
22EARTHWOOD LANETYPICAL MOTOR COURT SECTION F-FNTS30" DIA. PERORATED STORMDRAIN PIPE WRAPPED WITHGEOTEXTILE FABRIC.3/4" CRUSHED DRAIN ROCK WITHGEOTEXTILE FABRICDRY UTILITIESINCLUDING GASIN JOINT TRENCHJTPROPOSED FINISHPADPROPOSED FINISHPAD20'ACCESS EASEMENT6' MIN.4' WIDENATIVE SUBGRADE4" PVC UNLESS NOTEDOTHERWISE6" NDS SPEE-D DRAIN WITHROUND BLACK GRATE ORAPPROVED EQUALUSE ADS INSERTA TEE TOCONNECT TO 30" STORM DRAINADS ANGLEDFITTING12" MIN.WATER SERVICELATERAL TRENCH12"4.5'7.75'5' MIN.U.N.O.
±4.5'SUBGRADE @ 95%COMPACTION, UPPER 12"MIN. OR AS DIRECTED BYSOILS ENGINEERMOTOR COURT PAVING MATERIAL ANDEDGE CURBING IS A DEFERRED SUBMITTAL.INSTALL 18" STORM DRAIN(S=2.0% U.N.O)1% MIN3% MAX12% MAX1% MIN
2:1MAX2:1MAXPROPOSEDGRADE BREAKAT BACK OFSIDEWALKPROPOSEDRESIDENTIALCOMMONDRIVEWAYPROPOSED UPWARD DWY. PER CITY OFSAN LUIS OBISPO STD. 2130.ALSO SEE TYPICAL DWY. PERMEABLEPAVER SECTION ON SHEET C-3.3410' VERTICAL CURVE38.4'RAMPPROVIDE 2' BENCHMINIMUM(TYP)INSTALL NYLOPLAST DRAINBASIN WITH 36" X 36"DUCTILE IRON, TRAFFICRATED GRATECONNECT TOPUBLIC STORMDRAIN (SIZE ANDLOCATION PERPLAN)JOINT TRENCHOPEN BOTTOM BASIN WITHAN 18" SUMP AND 18" OF 1 12"DRAIN ROCK BELOW IT.CONTRACTOR SHALL WRAPMIRAFI 140 FILTER FABRICAROUND ROCK LENS.TYPICAL MOTOR COURT PROFILENTSINSTALL 4" X 30"INSERTA TEE FORLATERAL CONNECTIONINSTALL 4" X 30"INSERTA TEE FORLATERAL CONNECTIONINSTALL NYLOPLAST WEIRSTRUCTURE. INVERTSHALL BE AT TOP OFROCK OVER THE PIPEINSTALL 30" PERFORATEDSTORM DRAIN WITH 34" DRAINROCK (SEE INVERT ELEVATIONSON SHEET C-4.1 AND C-4.2.)INSTALL 30" HDPECAP (U.N.O.)N:\0601\0661-02-LP17-Avila-Ranch-Ph1-Con-Docs\Engineering\ConDocs\Hydro\O&M\Basin Exhibit.dwg, Motor Court, Feb 03, 2023 4:40pm, jewilson
FEBRUARY 2023AVILA RANCH0661-02-LP17MOTOR COURT (TYP)
U
6 PMI-9CURB AND GUTTER PERCITY STANDARD. CURBCUT WITH DEEPEND CURBAND 18" OPENINGEDGE OFAC PAVINGBIOSOIL MEDIA WITH2.0' MIN DEPTHSIDEWALK PERCITY STANDARD GRAVELSTORAGEWITH 3.5'MIN DEPTH12" DIAMETER SMOOTH DOWEL,INSTALLED PARALLEL TO EARTHWOODLANE, 24" LONG AT ALL EXPANSIONJOINTS OR PER MUNICIPAL STANDARDS.5" COBBLEENERGYDISSIPATERAT CURBOPENING6.0" PONDING DEPTH
12.0" RETAINING CURBTYPICAL BIOSWALE DETAILSCALE: N.T.S.6' DEEP SLURRY WALL. CONCRETE CLASS 3(3 SACK MIX). EXTEND 6" BELOW ROCKSECTION.INSTALL ATRIUM TG 6.0"ABOVE SURFACE OF BSM3' MAX12.0" WIDE SLURRY WALL12.0" WIDE SLURRY WALLNOTE:12" THICK CONCRETE BRACEWALL TO EXTEND 6" BELOWROCK SECTION. TOP OFWALL SHALL BE 4.0' TALL.6.0" TALL RETAINING CURB18" RETAINING CURB
12" DIAMETER SMOOTH DOWEL,INSTALL AT COLD JOINTBETWEEN SIDEWALK ANDRETAINING CURB. 24" LONGPER MUNICIPAL STANDARDS.N:\0601\0661-02-LP17-Avila-Ranch-Ph1-Con-Docs\Engineering\ConDocs\Hydro\O&M\Basin Exhibit.dwg, Bioswale Detail, Feb 03, 2023 4:40pm, jewilson
FEBRUARY 2023AVILA RANCH0661-02-LP17ON-SITE TREATMENT/RETENTIONAREA TYP.TYPICAL BIOSWALE
Avila Ranch Site Photos