HomeMy WebLinkAbout2023-10-31_Avila PH2-3 Stormwater O&M_HOASTORMWATER CONTROL MEASURES
OPERATION AND MAINTENANCE PLAN
For
TRACT 3089 - AVILA RANCH
PHASES 2 & 3
Entities Responsible for Maintenance:
Avila Ranch Development Homeowner’s Association (HOA)
July 2023
Prepared by:
612 Clarion Court
San Luis Obispo, CA 93401
805 544-4011
Job Number: 1493-0007 Date Signed: 7/28/2023
PRIVATE STORMWATER OPERATIONS
AND MAINTENANCE MANUAL
FILE COPY
STORM-0575-2023
Operations and Maintenance Plan for Tract 3089 Avila Ranch (Ph 2-3) - HOA
July 2023
Page 2 of 11
Page 2 of 11
Table of Contents
Introduction.................................................................................................................... 3
General Information ...................................................................................................... 4
Facilities to be Maintained ............................................................................................ 4
Underground Gravel Chambers – Motorcourt/ Alleys ............................................... 5
Concrete Perimeter Channels ................................................................................. 6
North Boundary Bypass Culvert............................................................................... 8
Site Inspection Procedures ........................................................................................ 10
Reporting Requirements ............................................................................................ 10
Revisions of Pollution Mitigation Measures ............................................................. 10
Tables
Table 1. Stormwater Control Measures ........................................................................... 4
Table 2. Gravel Chamber ................................................................................................ 5
Table 3. Concrete Channels ............................................................................................ 7
Table 4. Bypass Culverts ................................................................................................. 9
Figures
Figure 1. Tract 3089 – Avila Ranch Development ........................................................... 3
Figure 2. Motorcourt/Alley Gravel Chamber Typical Section ........................................... 5
Figure 3. Concrete Perimeter Channel Typical Section .................................................. 6
Figure 4. Concrete Perimeter Channel Locations ........................................................... 6
Figure 5: North Boundary Bypass Culvert Location ........................................................ 8
Appendix
Avila Ranch (Phases 2-3) Stormwater Control Measures (SCM) Exhibit
Maintenance & Inspection Forms
Operations and Maintenance Plan for Tract 3089 Avila Ranch (Ph 2-3) - HOA
July 2023
Page 3 of 11
Page 3 of 11
Introduction
This document is an operations and maintenance plan for the long-term inspection,
maintenance, and cleaning requirements of the Stormwater Control Measures
(SCMs) installed for Phases 2 & 3 of the Avila Ranch project. The project is a part of
the greater Avila Ranch Phases 1-6, which includes 149 acres of proposed
development including single and multi-family homes, commercial areas, parks, and
agricultural open space.
Below is a list of associated documents related to this report, for reference:
· Avila Ranch Development – Phase 1 Drainage Report prepared by RRM,
dated 9/17/2018
· Stormwater Control Plan for Avila Ranch, prepared by RMM, dated 3/22/2022.
· Annual Stormwater Maintenance Plan – Avila Ranch, prepared by RRM.
· Tract 3089 Avila Ranch – Phases 2, 3, 4, 5 & 6 Mass Grading – Drainage Report
(Vol. 1 of 2), prepared by Wallace Group, dated April 2023.
· Tract 3089 Avila Ranch – Phases 2, 3, 4, 5 & 6 Final Improvements – Drainage
Report (Vol. 2 of 2), prepared by Wallace Group, dated April 2023.
· Tract 3089 Avila Ranch – Phases 2, 3, 4, 5 & 6 Stormwater Control Plan, prepared by
Wallace Group, dated December 21, 2022.
· Tract 3089 – Public Improvement Plans – Phases 2 & 3, prepared by Wallace Group.
Figure 1. Tract 3089 – Avila Ranch Development
Phases 2 & 3
Phase 4, 5 & 6
Phase 1
Buckley Road
Va
c
h
e
l
l
L
a
n
e
Venture Drive
Earthwood Lane
Operations and Maintenance Plan for Tract 3089 Avila Ranch (Ph 2-3) - HOA
July 2023
Page 4 of 11
Page 4 of 11
General Information
The stormwater control measures (SCMs) proposed across Phases 2-3 of Avila
Ranch have been designed to capture, treat, and retain stormwater where feasible.
High groundwater levels and poor soil infiltration capabilities were identified in Phases
2 and 3, which limited greater utilization of retention and infiltration facilities. For more
information on project site conditions and SCM design, refer to the Phases 2-6
Drainage Report and Stormwater Control Plan, prepared by Wallace Group.
SCMs proposed for this project include the use of bioswales with underground gravel
trenches, underground gravel chamber systems, a vegetated basin, vegetated
swales, concrete-lined drainage channels, and bypass culverts.
Routine inspection, maintenance, and repair is crucial to the long-term success and
performance of these stormwater facilities. The proper operation and maintenance of
these facilities is described in the following sections.
Facilities to be Maintained
Table 1 provides a summary of each type of stormwater control measure. Refer to the
exhibits in the appendix for a map of where each SCM is located.
Table 1. Stormwater Control Measures
SCM ID * SCM Type Maintenance Entity
· A(#1)
· B(#1), B(#2), B(#3), B(#4),
B(#7), B(#8), B(#11)
· C(#1), C(#2)
Motorcourt/ Alley
Underground gravel
chamber system
Home Owners Association
(HOA)
· Perimeter channel adjacent
to Lot 186 and Alley 01
· Perimeter channel adjacent
to Lots 327, 307, 322
Concrete-lined perimeter
channel
· North Boundary Bypass
Culverts
Two, parallel 48” storm
drain culvert systems
* Referenced from Avila Ranch Phases 2-6 Stormwater Control Plan, see Stormwater Control
Measure (SCM) Exhibit
Operations and Maintenance Plan for Tract 3089 Avila Ranch (Ph 2-3) - HOA
July 2023
Page 5 of 11
Page 5 of 11
Underground Gravel Chambers – Motorcourt/ Alleys
Subsurface gravel chambers will be implemented to retain the 95th percentile runoff
from motorcourt/alley areas. The gravel chambers will incorporate Class III aggregate
base at varying widths and depths to store runoff and promote infiltration.
Runoff will enter into the underground gravel chambers through a storm drain inlet
which feeds stormwater into the underground gravel chambers through a 4”
perforated PVC pipe. Excess stormwater from larger rain events will overflow into the
primary storm drain pipe network and continue downstream. Refer to Figure 3 for a
typical detail of the proposed motorcourt/ alley gravel chambers.
Figure 2. Motorcourt/Alley Gravel Chamber Typical Section
The following maintenance matrix is provided for the underground gravel chamber
systems. A corresponding maintenance checklist is provided in the appendix for
proper record keeping of these maintenance activities.
Table 2. Gravel Chamber
Component Description Frequency Maintenance Activities
Inlet/Outlets Storm drain box and grate with 4” PVC
pipe to gravel trench. Storm drain inlet
is integrated with storm drain system to
convey excess flows.
Semiannually,
before & after
storm event
Lift grate cover to clean. Vacuum
any sediment accumulated at the
bottom of the box and remove
any trash or debris. Inspect for
signs of plugging and erosion, as
needed. Repair any chips &
cracks. Excavate and replace
structure, per plan, if needed.
** Note: If the performance of an SCM is severely limited or if failure of the SCM is suspected, the underground
aggregate rock storage layer may need to be investigated. If underground aggregate layer is found to be
clogged or failing, it may need to be excavated, removed, and replaced.
Operations and Maintenance Plan for Tract 3089 Avila Ranch (Ph 2-3) - HOA
July 2023
Page 6 of 11
Page 6 of 11
Concrete Perimeter Channels
Two rectangular, concrete channels have been integrated into the Avila Ranch
drainage design to capture and convey offsite run-on from northern adjacent
properties to Tank Farm Creek. These concrete channels are located along the
northern (North Boundary Run-on Swale) and western (Northwest Boundary Run-on
Swale) perimeter of Phase 3 and will discharge into separate storm drain networks
with outlets located south of Venture Drive within the vegetated bypass channel.
Steel trash racks will be strategically placed along the flowline of the concrete
channels to control debris and minimize clogging of downstream storm drains.
Figure 3. Concrete Perimeter Channel Typical Section
Figure 4. Concrete Perimeter Channel Locations
Venture Dr
Earthwood Ln
Memphis Belle
Piper Ct
Jespersen Rd
Tank Farm
Creek
Tank Farm
Creek
Operations and Maintenance Plan for Tract 3089 Avila Ranch (Ph 2-3) - HOA
July 2023
Page 7 of 11
Page 7 of 11
The following maintenance matrix is provided for the concrete channels. A
corresponding maintenance checklist is provided in the appendix for proper record
keeping of these maintenance activities.
Table 3. Concrete Channels
Component Description Frequency Maintenance Activities
Inlet/Outlets Channels discharge into storm drain
pipe networks to convey flows
downstream through development.
Semiannually,
before & after
storm event
Inspect for signs of clogging. Clean
debris & sediment from inlet/ outlet
pipes.
Channel Concrete, rectangular drainage
channel along perimeter of
development
Semiannually,
before & after
storm event
Inspect for signs of channel
damage, clogging, and erosion.
Clean out debris & sediment from
channel and trash racks. Repair or
replace damaged trash racks and
protective fencing if needed.
Contaminants Spills and contaminants, including
oils, grease, illicit discharge, etc.
Monthly Clean channels of contaminants,
identify and mitigate pollutant
source, report hazardous spills or
illicit discharges.
Embankment Adjacent side slopes surrounding
the concrete channels.
Semiannually,
before & after
storm event
Check embankment along property
lines for signs of erosion and
ensure that stormwater enters the
concrete channel over the northern
or western side walls in a non-
erosive sheet flow manner. If
erosion or concentrated flow has
occurred, correct grading to return
to sheet flow conditions.
Operations and Maintenance Plan for Tract 3089 Avila Ranch (Ph 2-3) - HOA
July 2023
Page 8 of 11
Page 8 of 11
North Boundary Bypass Culvert
The North Boundary Bypass Culvert is a storm drain system consisting of two 48-inch
HDPE pipes connecting the North Boundary Run-on Swale and Tank Farm Creek in
Phase 3 of Avila Ranch. These culverts discharge stormwater into Tank Farm Creek
immediately south of Venture Drive within the vegetated bypass channel.
Figure 7, below, shows the location of the bypass culverts in Phases 3. For specific
information on bypass culverts, refer to the following documents:
· Tract 3089 Avila Ranch – Phases 2, 3, 4, 5 & 6 Mass Grading – Drainage Report
(Vol. 1 of 2), prepared by Wallace Group, dated April 2023.
· Tract 3089 Avila Ranch – Phases 2, 3, 4, 5 & 6 Mass Grading Plan, prepared by
Wallace Group, dated May 2023.
Figure 5: North Boundary Bypass Culvert Location
Venture Dr
Earthwood Ln
Memphis Belle
Piper Ct
Jespersen Rd
Tank Farm
Creek
Tank Farm
Creek
Operations and Maintenance Plan for Tract 3089 Avila Ranch (Ph 2-3) - HOA
July 2023
Page 9 of 11
Page 9 of 11
The following maintenance matrix is provided for the bypass culverts. A
corresponding maintenance checklist is provided in the appendix for proper record
keeping of these maintenance activities.
Table 4. Bypass Culverts
Component Description Frequency Maintenance Activities
Inlets Perimeter channel discharges into
storm drain culvert pipes to convey
flows downstream through
development to Tank Farm Creek.
Semiannually,
before & after
large storm
event.
Inspect for signs of clogging. Clean
debris & sediment from inlets and
entry pipes.
Manhole
Structures
Storm drain box structure with metal
cover placed along pipe network.
Semiannually,
before & after
large storm
event.
Lift cover and remove any
obstructions within manhole.
Vacuum any sediment accumulated
at the bottom of the manhole and
remove any trash or debris.
Pipes HDPE storm drain pipes. Semiannually,
Beginning and
end of wet
season, as
needed
Inspect for signs of poor
performance and clogging. Clean
out debris & sediment from pipes.
Contaminants Spills and contaminants, including
oils, grease, illicit discharge, etc.
Monthly Inspect upstream channel and
areas surrounding manholes. Clean
areas of contaminants, identify and
mitigate pollutant source, report
hazardous spills or illicit discharges.
Outlets Storm drain outlets delivering
concentrated flows to Tank Farm
Creek.
Semiannually,
before & after
large storm
event.
Inspect for signs of plugging and
erosion. Clean debris & sediment
from outlet pipes.
Rock slope
protection
(RSP)
RSP pads prevent erosion to the
soil at the point where water enters
the creek and help to distribute
concentrated flows safely.
Semiannually,
before & after
large storm
event.
Clear obstructing debris &
sediment, replace missing or
eroded rock slope protection
Operations and Maintenance Plan for Tract 3089 Avila Ranch (Ph 2-3) - HOA
July 2023
Page 10 of 11
Page 10 of 11
Site Inspection Procedures
All site inspections should follow each inspection item outlined in the matrix tables
and inspection templates. Additional comments and photos should also be included
on the checklist form as needed.
Records regarding inspections and maintenance activities as outlined in this plan are
to be retained by the owner for a minimum of at least five years, and copies shall be
made available upon request to the City of San Luis Obispo or Regional Water
Quality Control Board. These records may include copies of completed inspection
reports and maintenance checklists to document any inspection and maintenance
activities that were conducted over the preceding five years. Corrective actions,
repairs, or replacements should also be documented and maintained with SCM
inspection and maintenance records for a minimum of five years.
The maintenance checklists to be used during inspections can be found in the
appendix.
Reporting Requirements
All required annual inspections, maintenance activities, forms and corresponding
documentation must be submitted to the City of San Luis Obispo no later than June
15th of each year.
Revisions of Pollution Mitigation Measures
If future correction or modification of stormwater control measures or procedures is
required, the Owner shall obtain approval from the governing stormwater agency prior
to commencing any work. Corrective measures or modifications shall not cause
discharges to bypass or otherwise impede existing stormwater control measures.
Operations and Maintenance Plan for Tract 3089 Avila Ranch (Ph 2-3) - HOA
July 2023
Page 11 of 11
Page 11 of 11
Appendix
Avila Ranch (Phases 2-3) Stormwater Control Measures (SCM) Exhibit
Maintenance & Inspection Forms:
· Underground Gravel Chamber
· Concrete Perimeter Channel
· North Boundary Bypass Culverts
>
>
c c c c c c c c c c c c c c c c
ccccccccccccccccccccccccccccccccccccccccccccccccccccccc
c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c c c c c c c c c c c c c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c
c c c c c c c c c c c c
SD
SD SD
SD
SS
SS
SD
SD
SDSD
SD
SD
SS
SS
SD
SS
SD
SD
SD
SD
SD
SD
SD
SD
SD
SS
SD SD
SS
SS
SS
SD
SD
SD
SD
SS SS
SS
S
D
SD
SS
SS
SD
SD SDSD
SD
SD SD
SD
SD SD
SD SD
SD SDSD
SD
SD
SSSS
SD
SD
SD SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD SD
SD
SD
SD SD
SS
SD
SD
SD
SD
SD
SDSD
SD
SD
SD
SD
SD
SD
SD
COMM #1
H (#3)
H (#4)
H (#5)
H (#9)
H (#8)
H (#10)H (#11)
H (#12)
H (#13)H (#14)H (#15)
H (#16)
H (#17)
H (#19)
H (#18)
E-PH4b (#6)
E-PH4b (#5)
E-PH4a (#1)
E-PH4a (#2)
E-PH4a (#3)
E-PH4a (#4)
E (#2)
E (#1)
E (#4)
E (#3)
A (#1)
B (#1)
B (#2)
B (#3)B (#4)
B (#5)
B (#6)
B (#7)
B (#8)
B (#9)
B (#10)
C (#1)
C (#2)
C (#3)C (#4)
C (#5)
D (#1)D (#2)
D (#3)
D (#4)
D (#5)D (#6)
D (#7)
D (#8)
G (#1)
G (#2)
G (#3)
G (#4)
B (#11)
COLLECTED BY FUTURE
ONSITE DRAINAGE SYSTEM
WHICH WILL BE CONNECTED
TO PH. 2-6 SD NETWORK
DMA E-PH4a & E-PH4b
STORMWATER TO BE
COLLECTED BY FUTURE
ONSITE DRAINAGE SYSTEM
WHICH WILL BE CONNECTED
TO PH. 2-6 SD NETWORK
H (#20)
COMM #2
5-89 5-80 5-67
5-88 5-81 5-66
5-655-825-87
5-86 5-83 5-64
5-635-845-85
5-62
5-61
5-60
5-59
5-58
5-57
5-56
5-98
5-99
5-100
5-101
232 231 228 227
226229230233
205
206
209
208
207
212
211
210 215
214
213
218
217
216
221
220
219
222
223
225
224
234 239
238235
240
241
242237236
243 244 246
245 248
247
249
250
251
254
253
252 257
256
255 260
259
258
261
262
263
266
265
264
267
268
269
270
271 272
273
276
275
274
277
278
279
282
281
280
283
284
285
287
286
288
289
290
291
292
293
297
296
295
294
307
306
305
304
308
309
310
311
321
320
319
318
322
323
324
325
298
299
300
301
302
303
314
313
312
315
316
317
193
200
330
326
327
186
187
329
202
203
204
328
60 120
1 IN = 60 FT
3000
VENTURE DRIVE
EA
R
T
H
W
O
O
D
L
A
N
E
JE
S
P
E
R
S
E
N
R
O
A
D
PAGE 1 OF 4
BASIN B
BOT. ELEV ≈ 113.50
GW ELEV = 105.00
Avila Ranch - Phases 2-6
Stormwater Control Measures (SCM) Exhibit
WRIGHT BROTHERS
BASIN H-1
POND = 0.6' + 1.0' FB
BOT. ELEV = 112.00
GW ELEV = 105.00
BASIN H-2
POND = 0.6' + 1.0' FB
BOT. ELEV = 110.00
GW ELEV = 105.00
DRAWN BY: RAH/ ZKP
5-16-2022
1493-0007
PROPOSED CONCRETE-LINED
PERIMETER SWALE (SEE AVILA RANCH
PHASES 2-6 MASS GRADING PLAN).
PROPOSED
CONCRETE-LINED
PERIMETER SWALE (SEE
AVILA RANCH PHASES 2-6
MASS GRADING PLAN).
PROPOSED CONCRETE-LINED
PERIMETER SWALE (SEE AVILA RANCH
PHASES 2-6 MASS GRADING PLAN).
PROPOSED CONCRETE-LINED
PERIMETER SWALE (SEE AVILA RANCH
PHASES 2-6 MASS GRADING PLAN).
LEGEND:
PHASE BOUNDARY
DRAINAGE MANAGEMENT AREA BOUNDARY
BIOSWALE WITH UNDERGROUND GRAVEL TRENCH
MOTORCOURT/ ALLEY GRAVEL CHAMBER
OFFSET GRAVEL CHAMBER
VEGETATED RETENTION BASIN
RETENTION-BASED TREATMENT AREA (REFER
TO APPENDIX F, ATTACHMENT E COMPLIANCE)
PERMEABLE PAVERS WITH GRAVEL CHAMBER
PROPOSED STORM DRAIN NETWORK
SCM IDENTIFICATION (REFER TO PHASES 2-6
SCM SIZING CALCULATIONS).
PHASE 5 LOT NUMBERS
PHASE 2, 3, 4, 6 LOT NUMBERS
SD
A (#1)
0-00
199
MULTI-FAMILY LOTS
NOT INCLUDED
MULTI-FAMILY LOTS
NOT INCLUDED
MULTI-FAMILY LOTS
NOT INCLUDED
RAC H E L A . H AWTH
O
R
N
E
C I V I L
No. 73686
A L
A
T
T
S
OF
E
C
A
O NRFI
I
REGISTE R E D P R O F E SSIONAL E
N
G
I
N
E
E
R
12/21/20225/19/2023
NORTH BOUNDARY
BYPASS CULVERTS
Yes No REQUIRED ACTION ACTION TAKEN
If no, lift grate cover to clean. Vacuum
any sediment accumulated at the
bottom of the box and remove any
trash or debris. Inspect for signs of
plugging and erosion, as needed.
Repair any chips & cracks. Excavate
and replace structure, per plan, if
needed.
SCM LOCATION:
MAINTENANCE RECORD
AVILA RANCH - SAN LUIS OBISPO - CA
MOTORCOURT/ ALLEY UNDERGROUND GRAVEL CHAMBER
SCM NUMBER:
RAINFALL IN LAST 24 HOURS (inches):
WEATHER CONDITIONS:
DATE AND TIME OF INSPECTION:
SITE PHOTOS ATTACHED
NAME OF INSPECTOR:
MAINTENANCE ITEMS
1) Inspect the inlet structures for signs
of plugging or accumulated debris. Is
the structure in adequate condition
and is able to carry out its function?
** Note: If the performance of an SCM is severely limited or if failure of the SCM is suspected, the underground aggregate
rock storage layer may need to be investigated. If underground aggregate layer is found to be clogged or failing, it may
need to be excavated, removed, and replaced.
Yes No REQUIRED ACTION ACTION TAKEN
If no, lift grate cover and remove any
obstructions within the structure.
Vacuum/clean any sediment
accumulated and remove any trash
or debris.
If yes, review landscape maintenance
operations operations – grass
clippings, mulch, dead vegetation.
Repair areas of erosion,
sweep/vacuum accumulated
sediment, prevent/clean
contamination from landscape
maintenance- grass clippings, leaves,
etc.
If yes, clean debris and sediment from
trash racks. Repair or replace
damaged trash rack, if needed.
If yes, clean debris or trash from
fencing. Repair or replace damaged
fencing, if needed.
If yes, clean channel of contaminants,
identify and mitigate pollutant source,
report any hazardous spills or illicit
discharges.
SCM LOCATION:
MAINTENANCE RECORD
AVILA RANCH - SAN LUIS OBISPO - CA
Concrete Channel
SCM NUMBER:
RAINFALL IN LAST 24 HOURS (inches):
WEATHER CONDITIONS:
DATE AND TIME OF INSPECTION:
5) Inspect the channel for
contaminants. Are there any
contaminant spills such as oils, grease,
illicit discharges, etc.?
SITE PHOTOS ATTACHED
3) Inspect metal trash racks. Is there
evidence of damage, debris, or
clogging?
NAME OF INSPECTOR:
MAINTENANCE ITEMS
1) Inspect the inlet/ outlet structures for
signs of plugging or accumulated
debris. Is the structure in adequate
condition and is able to carry out it's
deisgned function?
2) Inspect concrete channel
conditions. Is there evidence of
channel damage, clogging, or
surrounding erosion in tributary areas?
4) Inspect protective fencing. Is there
evidence of damage or debris?
Yes No REQUIRED ACTION ACTION TAKEN
If no, clean debris and sediment from
inlets and entry pipes.
If no, lift cover and remove any
obstructions within the structure.
Vacuum/clean any sediment
accumulated at bottom and remove
any trash or debris.
If yes, clean debris and sediment from
pipes.
If no, clean debris and sediment from
outlet structures.
If yes, clear obstructing debris &
sediment, replace missing or eroded
rip rap/ RSP. If erosion is prestn arounf
outlets, rehabilitate slopes as needed.
If yes, clean channel of contaminants,
identify and mitigate pollutant source,
report any hazardous spills or illicit
discharges.
DATE AND TIME OF INSPECTION:
** Note: Bypass Channel is located within environmental permitting agency jurisdiction and additional permits may be
required for maintenance operations.
MAINTENANCE RECORD
AVILA RANCH - SAN LUIS OBISPO - CA
Bypass Culverts
SCM NUMBER:
RAINFALL IN LAST 24 HOURS (inches):
WEATHER CONDITIONS:
5) Inspect the splash pads and rock
slope protection at culvert outlets. Is
there any indication the rip rap/ RSP
has been displaced or any other signs
of erosion?
6) Inspect the channel for
contaminants. Are there any
contaminant spills such as oils, grease,
illicit discharges, etc.?
SCM LOCATION:
SITE PHOTOS ATTACHED
3) Inspect storm drain pipes for
clogging. Is there evidence of poor
performance or clogging?
NAME OF INSPECTOR:
MAINTENANCE ITEMS
1) Inspect the inlets for signs of
plugging or clogging. Is the structure
in adequate condition and able to
carry out it's deisgned function?
2) Inspect manhole structures. Is there
evidence of clogging, accumulated
sediment or damage? Is the structure
in adequate condition and able to
carry out it's deisgned function?
4) Inspect the outlet structures for signs
of damage or clogging. Is the
structure in adequate condition and
able to carry out it's deisgned
function?