Table 3. Storm drain catch basins in the public right-of-way identified in City of Redding Trash Management Areas (TMAs) for potential installation of small trash full capture systems.
Trash
Management
Area (TMA)
# of Catch Basins for Small Full Capture Systems
Within the 30 Catchments for
Large Systems
Outside of the 30 Catchments
for Large Systems
Total
1 199 40 239
2 5 7 12
3 122 12 134
4 56 0 56
5 0 14 14
6 10 27 37
7 31 66 97
8 0 38 38
9 1 1 2
10 0 5 5
11 0 5 5
12 0 1 1
13 0 3 3
14 0 2 2
15 4 6 10
Total 428 227 655
Packet Pg. 377 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- 9 Estimated Costs and Benefits of Full Capture Systems
Preliminary planning level cost estimates and the estimated trash load reduction benefits5 associated with installing and maintaining trash full capture systems were calculated for large and small system scenarios.
The estimated costs and benefits of large systems were developed for each of the 30 potential locations identified. For small systems, costs and benefits were developed for both those inlets located within and outside of the 30 catchments delineated for large systems. 6 The cost estimates presented in this section were developed using methods and assumptions described in Appendix E and should be considered preliminary planning-level estimates that may not include all costs associated with the design, planning, purchasing, constructing/installing, and operating and maintaining the potential full capture system. Costs estimates presented are based on the most readily available information at the time this evaluation was conducted. Cost estimating for large systems is dependent upon the size of the system needed to address the full capture storm event (i.e., 1-yr, 1-hr).
The methods used to size large full capture systems are described in Appendix F.
Comparisons of capital (base) and on-going operation and maintenance (O&M) costs between small and large full capture systems are included in this section for the 30 catchments. These comparisons are provided to assist the City with identifying the most cost-effective full capture system approach to achieving the goal of the Trash Amendments. For areas outside of the 30 catchments, the estimated costs and benefits of installing and maintaining small full capture systems are also provided. Should the City decide to move forward with installing full capture systems (large or small) at the sites identified, more detailed designed and associated cost estimates will be needed before moving forward with construction/installation.
Large Full Capture Systems
Estimated base, annual ongoing, and lifecycle (50-year) costs of installing and maintaining large full capture systems at the 30 potential locations identified by the City are included in Table 4. Cost estimates were developed based on methods and assumptions described in Appendix E. Estimated trash reductions for each individual large full capture location are also included in Table 4.
Based on a field reconnaissance conducted in February 2020, a Baffle Box system would likely be the most optimal type of large full capture system for nine (9) of the thirty (30) potential locations for large full capture systems. Costs estimates in Table 4 were developed based on the assumption that Baffle Box type systems would be installed and maintained at these 9 sites. The costs for the installation of Baffle Boxes at these sites were derived primarily from a regression curve relating treatment flow to base costs, as described in Appendix E. During the February 2020 field reconnaissance, EOA determined that inchannel netting systems would be the most optimal type of large full capture system for the remaining twenty-one (21) locations. The base and maintenance costs presented for these locations assume that netting systems would be installed and maintained at these sites. Please note that the costs associated with in-channel netting systems are not readily available due to their limited application to-date, and therefore the costs are likely dependent upon the vendor and the type of netting system installed. Costs assumptions for end-of-pipe netting systems were used in place of assumptions for in-channel systems but may not fully include all anticipated costs such as the construction of concrete headwalls that would likely be required to withstand the force of storm flows on the in-channel nets. 5 Please note that the Implementation Plan provides an in-depth explanation of how trash loads (gallons/acre) are calculated from trash levels (acres). Trash reduction benefits are calculated based on the percentage of baseline trash loads addressed by the full capture system(s). 6 The estimated costs and benefits of large and small systems are compared to those associated with other trash control measures in the Final Cost Benefit Evaluation Report, which includes a cost-benefit evaluation that identifies and recommends the most cost-effective trash control measure strategy for the City.
Packet Pg. 378 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- 10 Table 4. Preliminary planning level cost estimates for addressing trash from moderate and high trash generating areas within the City of Redding via large trash full capture systems in the 30 primary catchments.
Catchment ID
Drainage Area
(acres)
% Trash
Reduction via
Treatment of
PLU areas
Probable Type of Large
Full Capture System
Base Costs
(System, Installation, and
Contingency)
On-going Costs
(Operation/Maintenance) Total
Lifecycle Costs
(50-years)
Total Lifecycle Costs
per % Trash
Reduction via
Treatment of PLU
areas
Total
(50 years)
Annual
(over 50 years)
FTC01A 135 1.1% In-line Netting $300,000 $600,000 $12,000 $900,000 $810,000 FTC01B 124 4.5% Baffle Box $1,290,000 $75,000 $1,500 $1,400,000 $310,000 FTC01C-1 552 8.1% Baffle Box $1,860,000 $75,000 $1,500 $1,900,000 $240,000 FTC01C-2 427 6.7% In-line Netting $525,000 $1,600,000 $31,000 $2,100,000 $320,000 FTC01C-3 382 6.5% Baffle Box $1,630,000 $75,000 $1,500 $1,700,000 $260,000 FTC01C-4 324 4.2% In-line Netting $500,000 $900,000 $18,000 $1,400,000 $330,000 FTC02A 130 1.6% In-line Netting $180,000 $600,000 $12,000 $780,000 $490,000 FTC03A-1 245 7.1% In-line Netting $400,000 $1,300,000 $25,000 $1,700,000 $240,000 FTC03A-2 19 0.1% In-line Netting $30,000 $310,000 $6,100 $340,000 $3,900,000 FTC03A-3 160 5.4% In-line Netting $250,000 $900,000 $18,000 $1,200,000 $220,000 FTC03A-4 34 1.1% In-line Netting $50,000 $310,000 $6,100 $360,000 $340,000 FTC03B-1 69 3.2% In-line Netting $300,000 $600,000 $12,000 $900,000 $280,000 FTC03B-2 69 3.2% Baffle Box $988,000 $75,000 $1,500 $1,100,000 $340,000 FTC03C 91 3.0% In-line Netting $300,000 $600,000 $12,000 $900,000 $300,000 FTC03D 10 0.8% In-line Netting $30,000 $310,000 $6,100 $340,000 $430,000 FTC04A-1 54 1.3% In-line Netting $200,000 $600,000 $12,000 $800,000 $620,000 FTC04A-2 50 1.3% In-line Netting $200,000 $600,000 $12,000 $800,000 $620,000 FTC04B-1 142 1.4% Baffle Box $1,090,000 $75,000 $1,500 $1,200,000 $870,000 FTC04B-2 124 0.9% In-line Netting $200,000 $600,000 $12,000 $800,000 $850,000 FTC04C 51 1.8% Baffle Box $799,000 $75,000 $1,500 $870,000 $490,000 FTC04D 96 1.3% In-line Netting $150,000 $900,000 $18,000 $1,100,000 $820,000 FTC04E 984 21.0% In-line Netting $1,000,000 $2,800,000 $55,000 $3,800,000 $180,000 FTC06A-1 260 1.7% In-line Netting $400,000 $900,000 $18,000 $1,300,000 $770,000 FTC06A-2 83 0.6% In-line Netting $180,000 $600,000 $12,000 $780,000 $1,300,000 FTC06A-3 159 1.1% In-line Netting $200,000 $600,000 $12,000 $800,000 $760,000 FTC07A 155 1.6% Baffle Box $970,000 $75,000 $1,500 $1,000,000 $610,000 FTC07B-1 81 1.2% Baffle Box $896,000 $75,000 $1,500 $970,000 $800,000 FTC07B-2 64 0.6% In-line Netting $200,000 $310,000 $6,100 $510,000 $920,000 FTC07B-3 11 0.5% In-line Netting $200,000 $310,000 $6,100 $510,000 $1,100,000 FTC07C 118 0.9% Baffle Box $831,000 $75,000 $1,500 $910,000 $990,000 Packet Pg. 379 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR 11 Small Full Capture Systems
The estimated costs and benefits of installing and maintaining small full capture systems are presented in Table 5 for the 428 catch basins located within the 30 catchments and in Table 6 for the 227 catch basins located outside of the 30 primary catchments. Cost estimates for small full capture systems were developed based on methods and assumptions described in Appendix E It is important to note that the trash reduction benefits of installing small full capture systems is challenging to estimate, given the limited information regarding the configuration of the City’s storm drain system and its connectivity to PLU and non-PLU areas. The following should be considered when evaluating the trash reduction benefits of small full capture systems presented in this report:
• Because some land areas drain to storm drain inlets located on private properties, these areas likely would not be treated by small full capture systems place in inlets in the public ROW.
Therefore, the trash reduction percentages under a small system installation scenario are inherently lower than those associated with a large system scenario that addresses the same area/catchment. This is one of the challenges of installing small systems within the public ROW. • Estimated trash reductions for small systems are based on a desktop analysis that used GIS and did not include field investigations. Because inflow pipes and flow patterns cannot be determined without field investigations, the reductions based on desktop GIS methods may be over or underestimated.
• Some inlets likely have physical characteristics that preclude the installation of a small system.
Areas draining to these inlets would therefore not be addressed by a small trash capture system, although included in the load reductions estimated here in this memorandum. Additionally, inlets that do not have a vault or are atypical in size or construction (e.g., pipe inlets, raised area drains, or teepees) cannot generally host a certified small full capture system and therefore have been excluded from the analysis.
• The area treated by a small catch basin system is somewhat dependent upon the type of system installed. Some systems only treat surface runoff and do not address flows from connecting pipes (e.g., baskets). For these systems, the area treated would be significantly reduced, compared to the estimated areas used in this memorandum to estimate trash load reductions. These types of systems are summarized in Appendix B.
Due to the uncertainties in calculating the area addressed by small capture systems, the trash reduction estimates provided in Tables 5 and 6 (and 7) should be considered preliminary. Should the City choose to install small systems, it is recommended that the treatment area for each system (or groups of systems) should be identified via field investigations and revised in GIS using the results. The associated trash reductions should be recalculated and revised accordingly prior to reporting reductions to the Regional or State Water Board.
Packet Pg. 380 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost-Benefit Evaluation Report) 12 Table 5. Preliminary planning level cost estimates for addressing trash from moderate and high trash generating areas within the City of Redding via small full capture systems in the 30 primary catchments.
Catchment ID # of Systems
% Trash Reduction
via Treatment of
PLU areas
Base Costs
(System and Installation)
Ongoing Costs
(Replacement & Operation/Maintenance)
Total Lifecycle Costs
(50-years)
Total Lifecycle Costs
per % Trash Reduction
via Treatment of PLU
areas
System Replacement
(2x over 50 years)
Annual
(over 50 years)
Total
(50 years)
FTC01A 14 1.0% $14,000 $28,000 $4,400 $250,000 $260,000 $250,000 FTC01B 59 4.5% $59,000 $118,000 $19,000 $1,100,000 $1,200,000 $270,000 FTC01C-1 126 8.1% $126,000 $252,000 $40,000 $2,300,000 $2,400,000 $300,000 FTC01C-2 99 6.7% $99,000 $198,000 $31,000 $1,700,000 $1,800,000 $270,000 FTC01C-3 94 6.5% $94,000 $188,000 $30,000 $1,700,000 $1,800,000 $280,000 FTC01C-4 45 4.2% $45,000 $90,000 $14,000 $790,000 $840,000 $200,000 FTC02A 5 0.6% $5,000 $10,000 $1,600 $90,000 $95,000 $150,000 FTC03A-1 28 3.4% $28,000 $56,000 $8,800 $500,000 $530,000 $160,000 FTC03A-2 3 0.1% $3,000 $6,000 $950 $54,000 $57,000 $650,000 FTC03A-3 16 2.5% $16,000 $32,000 $5,100 $290,000 $310,000 $130,000 FTC03A-4 8 0.9% $8,000 $16,000 $2,500 $140,000 $150,000 $160,000 FTC03B-1 15 2.2% $15,000 $30,000 $4,700 $270,000 $290,000 $130,000 FTC03B-2 15 2.2% $15,000 $30,000 $4,700 $270,000 $290,000 $130,000 FTC03C 15 1.9% $15,000 $30,000 $4,700 $270,000 $290,000 $150,000 FTC03D 4 0.6% $4,000 $8,000 $1,300 $73,000 $77,000 $120,000 FTC04A-1 12 0.7% $12,000 $24,000 $3,800 $210,000 $220,000 $320,000 FTC04A-2 12 0.7% $12,000 $24,000 $3,800 $210,000 $220,000 $320,000 FTC04B-1 8 0.5% $8,000 $16,000 $2,500 $140,000 $150,000 $270,000 FTC04B-2 6 0.3% $6,000 $12,000 $1,900 $110,000 $120,000 $350,000 FTC04C 8 0.5% $8,000 $16,000 $2,500 $140,000 $150,000 $280,000 FTC04D 11 0.8% $11,000 $22,000 $3,500 $200,000 $210,000 $280,000 FTC04E 106 10.7% $106,000 $212,000 $33,000 $1,900,000 $2,000,000 $190,000 FTC06A-1 9 0.8% $9,000 $18,000 $2,800 $160,000 $170,000 $210,000 FTC06A-2 2 0.2% $2,000 $4,000 $630 $36,000 $38,000 $180,000 FTC06A-3 7 0.6% $7,000 $14,000 $2,200 $120,000 $130,000 $220,000 FTC07A 19 1.5% $19,000 $38,000 $6,000 $340,000 $360,000 $230,000 FTC07B-1 11 0.9% $11,000 $22,000 $3,500 $200,000 $210,000 $240,000 FTC07B-2 4 0.3% $4,000 $8,000 $1,300 $73,000 $77,000 $290,000 FTC07B-3 5 0.5% $5,000 $10,000 $1,600 $90,000 $95,000 $210,000 FTC07C 1 0.1% $1,000 $2,000 $320 $18,000 $19,000 $290,000 Packet Pg. 381 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR 13 Table 6. Preliminary planning level cost estimates for addressing trash from moderate and high trash generating areas within the City of Redding via small full capture systems in areas outside of the 30 catchments for potential large capture systems.
Catchment ID # of Systems
% Trash Reduction
via Treatment of PLU
areas
Base Costs
(System and Installation)
Ongoing Costs
(Replacement & Operation/Maintenance)
Total Lifecycle Costs
(50-years)
Total Lifecycle Costs
per % Trash Reduction
via Treatment of PLU
areas
System Replacement
(2x over 50 years)
Annual
(over 50 years)
Total
(50 years)
TMA 1 40 3.6% $40,000 $80,000 $13,000 $730,000 $770,000 $220,000 TMA 2 7 0.8% $7,000 $14,000 $2,200 $120,000 $130,000 $170,000 TMA 3 12 1.5% $12,000 $24,000 $3,800 $210,000 $220,000 $150,000 TMA 4 -- -- -- -- -- -- -- --
TMA 5 14 1.6% $14,000 $28,000 $4,400 $250,000 $260,000 $170,000 TMA 6 27 2.7% $27,000 $54,000 $8,500 $480,000 $510,000 $190,000 TMA 7 66 4.5% $66,000 $132,000 $21,000 $1,200,000 $1,300,000 $290,000 TMA 8 38 3.2% $38,000 $76,000 $12,000 $680,000 $720,000 $230,000 TMA 9 1 0.0% $1,000 $2,000 $320 $18,000 $19,000 $470,000 TMA 10 5 0.7% $5,000 $10,000 $1,600 $90,000 $95,000 $130,000 TMA 11 5 0.2% $5,000 $10,000 $1,600 $90,000 $95,000 $470,000 TMA 12 1 0.0% $1,000 $2,000 $320 $18,000 $19,000 $470,000 TMA 13 3 0.2% $3,000 $6,000 $950 $54,000 $57,000 $290,000 TMA 14 2 0.1% $2,000 $4,000 $630 $36,000 $38,000 $470,000 TMA 15 6 0.5% $6,000 $12,000 $1,900 $110,000 $120,000 $270,000 Totals 227 19.4% $227,000 $454,000 $72,220 $4,086,000 $4,353,000 $224,381 Packet Pg. 382 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR 14 Comparison of the Costs & Benefits of Large and Small Full Capture Systems The costs and benefits of installing and maintaining large and small full capture systems to address trash generated in PLU areas were compared. Comparisons were made based on the total estimated accumulated (50-year lifecycle) costs associated with the installation and maintenance of each type of system(s). The results of the comparison are provided in Table 7. The most cost-effective implementation scenario for each catchment is identified as the scenario that has the lowest lifecycle costs per each percent trash reduction.
Based on the comparison, the most cost-effective full capture scenario for 3 out of the 30 catchments is a large full capture system. Small full capture systems have lower estimated life-cycle costs for the remaining 27 catchments. Small full capture systems are the only feasible option identified to address trash from PLU areas outside of the 30 catchments.
These results suggest that that if the City were to primarily take a full capture approach to addressing the goal of the Trash Amendments, then installing a combination of small and large full capture systems in the 30 catchments of interest would be the most cost-effective approach. The proposed optimal costeffective full capture approach outlined in Table 7 for large (n=3) and small devices (n=112) within the 30 catchments could achieve a maximum of 56% trash reduction, and the installation of small devices outside of the 30 catchments (n=227) would achieve an additional trash reduction of 19%. Together, the installation of large and small systems in the City’s MS4 would achieve an estimated 75% trash reduction.
Based on the current understanding of the configuration of the City’s MS4 and its connectivity to PLU areas, it is estimated that the remaining trash reduction needed to achieve the goal of the Trash Amendments (i.e., approximately 25%) would need to be achieved via the implementation of trash controls other than the installation of trash full capture systems owned and operated by the City. Many PLU areas are assumed to have private drainage systems that connect to the City’s MS4 storm drain lines (i.e., not the City-owned inlets in the public right-of-way) and therefore small full capture systems installed in inlets in the public right-of-way would not address trash from these PLU areas. Additionally, other locations for large full capture systems do not appear to be feasible to address trash from these areas draining to inlets on private properties. As discussed in the City’s broader Trash Control Measure Evaluation (January 2022), the City will need to consider implementing other types of trash control measures to ensure that trash from these areas is addressed and the overall Trash Amendments goal is achieved.
Packet Pg. 383 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- 15 Table 6. Comparison of estimated costs and benefits for Large and Small Trash Full Capture Systems within the 30 primary catchments.
Catchment
ID
Large Full Capture Systems Small Full Capture Systems
Most Cost-effective
Full Capture
Scenario
Lifecycle Cost
(50 years)
% Trash Reduction
from PLU areas
Total Lifecycle Costs per %
Trash Reduction via
Treatment of PLU areas
Lifecycle Costs
(50 years)
# Devices
% Trash
Reductiona
Total Lifecycle Costs per
% Trash Reduction via
Treatment of PLU areas
FTC01A $900,000 1.1% $810,000 $260,000 14 1.0% $250,000 Small FTC01B $1,400,000 4.5% $310,000 $1,200,000 59 4.5% $270,000 Small FTC01C-1 $1,900,000 8.1% $240,000 $2,400,000 126 8.1% $300,000 Large FTC01C-2 $2,100,000 6.7% $320,000 $1,800,000 99 6.7% $270,000 Small FTC01C-3 $1,700,000 6.5% $260,000 $1,800,000 94 6.5% $280,000 Large FTC01C-4 $1,400,000 4.2% $330,000 $840,000 45 4.2% $200,000 Small FTC02A $780,000 1.6% $490,000 $95,000 5 0.6% $150,000 Small FTC03A-1 $1,700,000 7.1% $240,000 $530,000 28 3.4% $160,000 Small FTC03A-2 $340,000 0.1% $3,900,000 $57,000 3 0.1% $650,000 Small FTC03A-3 $1,200,000 5.4% $220,000 $310,000 16 2.5% $130,000 Small FTC03A-4 $360,000 1.1% $340,000 $150,000 8 0.9% $160,000 Small FTC03B-1 $900,000 3.2% $280,000 $290,000 15 2.2% $130,000 Small FTC03B-2 $1,100,000 3.2% $340,000 $290,000 15 2.2% $130,000 Small FTC03C $900,000 3.0% $300,000 $290,000 15 1.9% $150,000 Small FTC03D $340,000 0.8% $430,000 $77,000 4 0.6% $120,000 Small FTC04A-1 $800,000 1.3% $620,000 $220,000 12 0.7% $320,000 Small FTC04A-2 $800,000 1.3% $620,000 $220,000 12 0.7% $320,000 Small FTC04B-1 $1,200,000 1.4% $870,000 $150,000 8 0.5% $270,000 Small FTC04B-2 $800,000 0.9% $850,000 $120,000 6 0.3% $350,000 Small FTC04C $870,000 1.8% $490,000 $150,000 8 0.5% $280,000 Small FTC04D $1,100,000 1.3% $820,000 $210,000 11 0.8% $280,000 Small FTC04E $3,800,000 21.0% $180,000 $2,000,000 106 10.7% $190,000 Large FTC06A-1 $1,300,000 1.7% $770,000 $170,000 9 0.8% $210,000 Small FTC06A-2 $780,000 0.6% $1,300,000 $38,000 2 0.2% $180,000 Small FTC06A-3 $800,000 1.1% $760,000 $130,000 7 0.6% $220,000 Small FTC07A $1,000,000 1.6% $610,000 $360,000 19 1.5% $230,000 Small FTC07B-1 $970,000 1.2% $800,000 $210,000 11 0.9% $240,000 Small FTC07B-2 $510,000 0.6% $920,000 $77,000 4 0.3% $290,000 Small FTC07B-3 $510,000 0.5% $1,100,000 $95,000 5 0.5% $210,000 Small FTC07C $910,000 0.9% $990,000 $19,000 1 0.1% $290,000 Small Outside of 30 Primary Catchments NA NA NA $4,353,000 227 19.4% $224,381 Small a % reductions estimated for small full capture may be less than the % reductions for large full capture because of trash generating areas draining to catch basins on private land areas that would not be addressed via small devices located in the public ROW.
Packet Pg. 384 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR A-1
Appendix A
Baseline Generation Maps for PLU Parcels in Redding
Packet Pg. 385 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- A-2
City of Redding Baseline Trash Generation Map (Revised in August 2021) Packet Pg. 386 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- B-1
Appendix B
Descriptions of Trash Full Capture Systems
The State Water Board defines a trash full capture system as follows:
A single system (or a series of systems) that traps all particles that are 5 mm or greater and has a design treatment capacity that is either: a) of not less than the peak flow rate, Q, resulting from a one-year, one-hour, storm in the subdrainage area, or b) appropriately sized to, and designed to carry at least the same flows as, the corresponding storm drain.” (State Water Board 2015) In 2017, the State Water Board developed a list of certified full trash capture systems which may be installed to comply with the Trash Amendments.7 Full trash capture systems must trap all particles retained by a 5-millimeter mesh screen and have a design treatment capacity of not less than the peak flow rate resulting from a one-year, one-hour storm event. Systems certified by the State Water Board include larger “end-of-pipe” and “in-line” netting and screening systems, and smaller screening systems installed in storm drain vaults or catch basins. Descriptions of both large and small full capture systems are included in this section.
Large Full Capture Systems
Large systems can treat an entire stormwater catchment area, including storm drains on private property, and provide a single location for maintenance, saving operation and maintenance resources over time.
Two disadvantages of large systems are the relatively high capital and construction costs, which require a large initial funding source, and the higher instance of subsurface utility conflicts at desired locations within highly urbanized areas.
There are three types of large full capture systems currently certified by the State Water Boardhydrodynamic separators, gross solids removal devices, and netting systems. Each of these types of large systems have been installed in the Bay Area. Examples of these types of systems are provided in this section. The selection of large systems for reducing trash will depend on the characteristics of a specific location, hydraulic impacts, potential for environmental permitting, and resulting trash load reduction percentage.
Hydrodynamic Separators – Vortex Separator
The most common large system installed within the Bay Area is a hydrodynamic separator (HDS), also known as a vortex separator or swirl concentrator (Figure A1). These systems are produced by several manufacturers, each with their own design, but all contain large cylindrical separation chambers in which stormwater enters, creating a vortex to separate trash, debris, oil, and other pollutants from stormwater.
The velocity is highest at the outer edge of the vortex, keeping trash and debris from clogging outflow holes and allowing the stormwater to leave the cylinder. Heavier material settles to the bottom of the storage sump, and floatables remain on the surface of the water within the separator cylinder.
Trash, debris, and sediment is usually removed from the HDS with a vacuum truck, however, alternative systems may be fitted with a large basket to collect settled material, which is subsequently removed via a boom truck and emptied into a container for disposal. HDS units have the advantage of having a relatively small footprint and offer additional flexibility in their installation locations when compared to other types 7 Future approvals of new trash full capture systems will be administered by the State Water Board through implementation of the statewide Trash Amendments. https://www.waterboards.ca.gov/water_issues/programs/stormwater/docs/trash_implementation/a1_certified_fcd.pdf Packet Pg. 387 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- B-2
of large systems. HDS units come in a large variety of types and sizes, and may be scaled up to handle peak flows of several hundred cubic feet per second. They can also be small enough to be retrofitted into existing manholes. Studies have shown that HDS units can be highly effective at trapping trash.
Although there are many advantages to HDS units for trash control, they also have their disadvantages.
Compared to other types of large systems, HDS units can have high capital costs. Additionally, for large drainage areas (e.g., >300 acres), the sump depths for HDS units may need to be greater than 25 feet, which poses a maintenance challenge given that typical atmospheric pressure limits vertical suction lift of pumps (i.e., vacuum trucks). Additional booster pumps are therefore needed to clean HDS sumps at these depths.
Figure A1. (Left) Diagram of a Contech CDS® hydrodynamic separator (Source:
www.conteches.com/products/stormwater-management/treatment). (Right) Separator Cylinder of Contech CDS® hydrodynamic separator (Courtesy of City of San Jose).
Hydrodynamic Separators – Nutrient/Debris Separating Baffle Boxes Nutrient Separating Baffle Boxes (NSBB) and Debris Separating Baffle Boxes (DSBB) are both a type of hydrodynamic separator designed with a shallower depth than a vortex separator (Figure A2). Treatment flow rates vary by size and configuration of the unit. Stormwater enters a rectangular chamber with a screening system suspended above sedimentation chambers to separate trash, debris, oil, and other pollutants from stormwater.
The NSBB/DSBB screening system stores trash and debris in a dry state which minimizes nutrient leaching, bacterial growth, and odors. All collected material within the screening system and sump is removed with a vacuum truck. NSBB/DSBB units are shallower than vortex separators, reducing the need for shoring during construction. NSBB and DSBB unit configurations are available for in-line or off-line installation. At least two NSBB/DSBB units are currently installed in the Bay Area, with several more planned.
The disadvantages to NSBB/DSBB units for trash control include the need for a larger footprint for siting the system and the limited information on maintenance and operation. Because the design of the NSBB/DSBB requires a larger horizontal footprint than vortex separators, utility and ROW conflicts may pose a challenge to installation and maintenance. Additionally, since these systems are relatively new types of trash controls, maintenance experience and considerations are generally not well established.
Packet Pg. 388 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- B-3
Figure A2. Bio Clean Debris Separating Baffle Box (Source: https://biocleanenvironmental.com/debrisseparating-baffle-box/).
Gross Solids Removal Systems (GSRD)
Gross solids removal devices (GSRD) have also been installed in the Bay Area (Figure A3). A GSRD may be installed as a series of screens in-line, within a channel, at the end of a pipe, or within the forebay of a stormwater pump station. As stormwater enters the GSRD, trash and debris are captured inside the screens and water exits through 5 mm wide gaps (i.e., screen louvers). GSRDs may be installed in a linearradial configuration to treat flows from pipes that are 12 to 72 inches in diameter to the desired capacity or within the forebay of a stormwater pump station as a flat-panel configuration. A GSRD may require a large horizontal footprint compared to the other systems but may be the best option if space is not a consideration.
The linear-radial configuration is maintained by opening the length of the system and vacuuming trash and debris stored within the system. The flat-panel configuration is maintained by removing trash and debris adhering to the panels. Figure B4 shows the GSRD installed at the Wrigley-Ford pump station in the City of Milpitas. The Milpitas system is a linear-radial and flat-panel configuration. Additional information on GSRDs may be found on the Roscoe Moss Company website, the manufacturer of the systems (https://roscoemoss.com/products/stormwater-gross-solids-removal-device/).
Disadvantages to the GSRD include siting and maintenance challenges. Siting can be difficult in certain situations due to the extent of the footprint needed to construct and maintain the device. Additionally, maintenance challenges with extruding the material captured by the GSRD are common with these types of devices.
Packet Pg. 389 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- B-4
Figure A3. Cut away view of Linear Radial Configuration #1 (LR-1) screen (courtesy of the American Society of Civil Engineers Publications).
Figure A4. Gross solids removal device (GSRD) in linear-radial configuration (Left) and installed in the City of Milpitas (Right).
Netting Systems
Netting systems rely on the force of flowing water to trap floatables in disposable nylon mesh bags of varying mesh sizes and storage volumes. The typical configuration is a large net installed end-of-pipe, however, the manufacturers indicate that these nets can also be placed in-line. Netting systems may be designed and installed to treat any size of catchment but are most commonly used to treat relatively large catchments. Two types of netting systems are available. The first is the NetTech manufactured by Oldcastle Stormwater Solutions (formerly KriStar Enterprises, Inc.) and requires very little infrastructure to install. It can be installed with a relatively small initial cost relative to the other types of systems. This system is placed over the entire outfall and is attached to the outfall with a tether (Figure A5). It is designed to detach with a certain amount of force, usually when the net is full. Once full, the net closes and detaches, and the tether prevents the net from moving down stream. The net requires a minimum Packet Pg. 390 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- B-5
footprint of ten feet between the outfall and the receiving water body and must be placed on a concrete pad.
Figure A5. Oldcastle Stormwater Solutions NetTech Gross Pollutant Trap within City of Vallejo (Source:
https://oldcastleprecast.com).
The second type of netting system is the TrashTrap manufactured by StormTrap Technologies Inc. (formerly Fresh Creek Technologies Inc.). It requires a structure to house the netting system (Figure A6).
The nets are designed not to detach automatically. An overflow screen is located above the nets so that any excess flows can easily bypass. Once full, nets are removed with a boom truck and disposed. New nets may be installed to eliminate the cleaning of existing nets. This netting system can be easily scaled up, has negligible headloss (does not increase upstream flooding) when cleaned regularly, and may be installed under water or within tidal areas, allowing it to be installed in more types of locations than the other systems. This flexibility is particularly important in San Mateo of San Mateo where many of the outfalls have significant tidal influence or partially submerged.
Figure A6. StormTrap Technologies End-of-Pipe Netting TrashTrap® (Courtesy of StormTrap Technologies, Inc.).
Packet Pg. 391 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- B-6
Small Full Capture Systems
Screening systems that are installed in stormwater catch basins (or catch basins) are commonly known as catch basin inserts (CBIs). CBIs are placed inside a catch basin to prevent trash, organic material (e.g. leaves and twigs) and sediment from entering the storm drain outflow pipe within the catch basin. There are two general designs of CBIs, catch basin inserts and outlet inserts. Catch basin inserts are placed inside the catch basin, while outlet inserts are placed in front of the outlet pipe. A wide variety of CBI designs exist, mostly in the form of outlet inserts (e.g., connector pipe screens) that are placed in front of the outlet pipe. Figure A7 shows examples of connector pipe screens (CPSs) installed in the Bay Area.
Figure A8 illustrates a catch basin insert manufactured by Revel Environmental Manufacturing, Inc. CBIs that use filtering walls or filter media are not applicable for trapping trash and do not meet the full trash capture standard. As a result, the term “insert” does not refer to configurations that use filter media for removing other stormwater pollutants.
Maintenance is performed with a vacuum truck or manually with a shovel. At a minimum, maintenance is performed at least once per year to ensure that the system meets the full capture standard. If the system is observed to have a plugged or blinded screen or is greater than 50 percent full during a maintenance event, the maintenance frequency should be increased so that the system is neither plugged nor more than half full at the next maintenance event.
Figure A7. Small Connector Pipe Screens installed in catch basins within the Bay Area.
Packet Pg. 392 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- B-7
Figure A8. Catch basin insert manufactured by Revel Environmental Manufacturing, Inc.
Packet Pg. 393 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- C-1
Appendix C
Maps Illustrating Potential Large Full Capture System Locations Packet Pg. 394 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- C
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Packet Pg. 411 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost-Benefit Evaluation Report) C
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Packet Pg. 421 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost-Benefit Evaluation Report) D-1
Appendix D
Locations of Storm Drain Inlets for Potential
Small Trash Full Capture Systems
Packet Pg. 422 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
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City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
1 17788 CATCHBASIN CITY1 NA 40.5799-122.386
2 17807 CATCHBASIN CITY1 NA 40.5794-122.386
3 17815 AREADRAIN CITY1 NA 40.5821-122.387
4 17820 AREADRAIN CITY1 NA 40.5819-122.387
5 17821 CATCHBASIN CITY1 NA 40.5821-122.387
6 17822 CATCHBASIN CITY1 NA 40.5816-122.387
7 17784 CATCHBASIN CITY1 NA 40.5856-122.382
8 17813 CATCHBASIN CITY1 NA 40.5831-122.388
9 17816 CATCHBASIN CITY1 NA 40.5829-122.387
10 18768 CATCHBASIN CITY1 NA 40.5847-122.385
11 18769 CATCHBASIN CITY1 NA 40.5845-122.385
12 17847 CATCHBASIN CITY1 NA 40.5855-122.382
13 15117 AREADRAIN CITY1 NA 40.5898-122.378
14 15118 AREADRAIN CITY1 NA 40.5896-122.378
15 15119 AREADRAIN CITY1 NA 40.5894-122.378
16 15120 AREADRAIN CITY1 NA 40.5888-122.378
17 15121 AREADRAIN CITY1 NA 40.5888-122.379
18 15124 AREADRAIN CITY1 NA 40.5886-122.38
19 15125 AREADRAIN CITY1 NA 40.5887-122.38
20 17879 CATCHBASIN CITY1 NA 40.5886-122.38
21 17880 CATCHBASIN CITY1 NA 40.5883-122.379
22 17882 CATCHBASIN CITY1 NA 40.5875-122.38
23 17883 CATCHBASIN CITY1 NA 40.5885-122.379
24 17886 CATCHBASIN CITY1 NA 40.5888-122.38
25 16590 CATCHBASIN CITY1 NA 40.5752-122.372
26 17901 CATCHBASIN CITY1 NA 40.5784-122.376
27 17909 CATCHBASIN CITY1 NA 40.5844-122.375
28 17828 CATCHBASIN CITY1 NA 40.5815-122.384
29 17829 CATCHBASIN CITY1 NA 40.5812-122.384
30 17922 CATCHBASIN CITY1 NA 40.5769-122.373
31 17929 CATCHBASIN CITY1 NA 40.5771-122.371
32 17935 CATCHBASIN CITY1 NA 40.5892-122.378
33 18700 CATCHBASIN CITY1 NA 40.5891-122.378
34 18485 AREADRAIN CALTRANS1 NA 40.5872-122.379
35 21021 AREADRAIN CITY1 NA 40.5746-122.375
36 18772 CATCHBASIN CITY1 NA 40.5837-122.385
37 18697 CATCHBASIN CITY1 NA 40.5899-122.377
38 17904 CATCHBASIN CITY1 NA 40.575-122.376
Packet Pg. 438 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
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City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
39 23619 AREADRAIN CITY1 NA 40.5751-122.376
40 18487 CATCHBASIN CITY1 NA 40.5879-122.381
41 17293 CATCHBASIN CITY1 FTC01A 40.5879-122.399
42 17295 CATCHBASIN CITY1 FTC01A 40.587-122.4
43 17286 CATCHBASIN CITY1 FTC01A 40.5872-122.4
44 18428 AREADRAIN CITY1 FTC01A 40.5868-122.4
45 17269 CATCHBASIN CITY1 FTC01A 40.5859-122.405
46 17270 CATCHBASIN CITY1 FTC01A 40.5859-122.405
47 17290 CATCHBASIN CITY1 FTC01A 40.5863-122.401
48 16233 AREADRAIN CITY1 FTC01B 40.5885-122.396
49 15132 AREADRAIN CALTRANS1 FTC01B 40.5877-122.392
50 16482 CATCHBASIN CITY1 FTC01B 40.5877-122.386
51 15514 AREADRAIN CITY1 FTC01B 40.5889-122.388
52 15546 AREADRAIN CALTRANS1 FTC01B 40.5866-122.391
53 15566 AREADRAIN CITY1 FTC01B 40.5883-122.395
54 15568 CATCHBASIN CITY1 FTC01B 40.5881-122.395
55 15608 CATCHBASIN CITY1 FTC01B 40.5868-122.397
56 17420 CATCHBASIN CITY1 FTC01B 40.587-122.397
57 18776 AREADRAIN CITY1 FTC01B 40.5864-122.386
58 20178 CATCHBASIN CITY1 FTC01B 40.5887-122.388
59 15085 AREADRAIN CALTRANS1 FTC01B 40.5856-122.391
60 15086 AREADRAIN CALTRANS1 FTC01B 40.5854-122.391
61 15088 AREADRAIN CITY1 FTC01B 40.5851-122.39
62 15092 AREADRAIN CITY1 FTC01B 40.5841-122.389
63 15140 AREADRAIN CITY1 FTC01B 40.5896-122.395
64 17859 CATCHBASIN CITY1 FTC01B 40.5897-122.388
65 17862 CATCHBASIN CALTRANS1 FTC01B 40.5872-122.388
66 17863 CATCHBASIN CITY1 FTC01B 40.5871-122.388
67 17864 CATCHBASIN CITY1 FTC01B 40.5871-122.388
68 17436 CATCHBASIN CITY1 FTC01B 40.5896-122.391
69 17442 CATCHBASIN CITY1 FTC01B 40.5895-122.39
70 17443 CATCHBASIN CITY1 FTC01B 40.5896-122.389
71 17444 CATCHBASIN CITY1 FTC01B 40.5893-122.39
72 17445 CATCHBASIN CITY1 FTC01B 40.5891-122.39
73 16828 CATCHBASIN CITY1 FTC01B 40.5899-122.388
74 17401 CATCHBASIN CITY1 FTC01B 40.5848-122.389
75 17402 CATCHBASIN CITY1 FTC01B 40.5845-122.39
76 17449 CATCHBASIN CITY1 FTC01B 40.5892-122.39
Packet Pg. 439 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
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City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
77 17450 CATCHBASIN CITY1 FTC01B 40.5891-122.39
78 17457 CATCHBASIN CITY1 FTC01B 40.589-122.388
79 20312 AREADRAIN CALTRANS1 FTC01B 40.5902-122.394
80 15091 AREADRAIN CITY1 FTC01B 40.5845-122.389
81 15094 AREADRAIN CITY1 FTC01B 40.5836-122.39
82 15139 AREADRAIN CITY1 FTC01B 40.5897-122.395
83 15538 AREADRAIN CITY1 FTC01B 40.5864-122.391
84 15539 AREADRAIN CITY1 FTC01B 40.5864-122.391
85 15556 AREADRAIN CITY1 FTC01B 40.5898-122.395
86 17424 CATCHBASIN CITY1 FTC01B 40.5897-122.395
87 17425 CATCHBASIN CITY1 FTC01B 40.5898-122.395
88 17399 CATCHBASIN CALTRANS1 FTC01B 40.5848-122.39
89 17400 CATCHBASIN CITY1 FTC01B 40.5846-122.389
90 17410 CATCHBASIN CITY1 FTC01B 40.5846-122.39
91 18779 CATCHBASIN CITY1 FTC01B 40.5857-122.386
92 18780 CATCHBASIN CITY1 FTC01B 40.5855-122.386
93 17869 CATCHBASIN CALTRANS1 FTC01B 40.5864-122.388
94 17870 CATCHBASIN CALTRANS1 FTC01B 40.5862-122.387
95 17451 CATCHBASIN CITY1 FTC01B 40.5861-122.389
96 17453 CATCHBASIN CALTRANS1 FTC01B 40.586-122.389
97 17458 CATCHBASIN CITY1 FTC01B 40.5859-122.389
98 15138 AREADRAIN CITY1 FTC01B 40.5895-122.396
99 15554 CATCHBASIN CITY1 FTC01B 40.589-122.396
100 20176 AREADRAIN CALTRANS1 FTC01B 40.5865-122.392
101 20730 AREADRAIN CITY1 FTC01B 40.59-122.393
102 21389 AREADRAIN CITY1 FTC01B 40.5845-122.391
103 20177 AREADRAIN CITY1 FTC01B 40.5867-122.391
104 23534 CATCHBASIN CITY1 FTC01B 40.5866-122.391
105 17448 CATCHBASIN CITY1 FTC01B 40.5896-122.391
106 17437 CATCHBASIN CITY1 FTC01B 40.5895-122.391
107 15097 CATCHBASIN CITY1 FTC01C-1 40.5826-122.389
108 15105 AREADRAIN CITY1 FTC01C-1 40.5816-122.394
109 15109 AREADRAIN CITY1 FTC01C-1 40.5827-122.395
110 17343 CATCHBASIN CITY1 FTC01C-1 40.5808-122.397
111 17347 CATCHBASIN CITY1 FTC01C-1 40.5843-122.395
112 17348 CATCHBASIN CITY1 FTC01C-1 40.5846-122.395
113 17352 CATCHBASIN CITY1 FTC01C-1 40.5836-122.394
114 17353 CATCHBASIN CITY1 FTC01C-1 40.5817-122.393
Packet Pg. 440 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
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City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
115 16832 CATCHBASIN CITY1 FTC01C-1 40.5812-122.388
116 15768 AREADRAIN CITY1 FTC01C-1 40.5818-122.393
117 15771 AREADRAIN CITY1 FTC01C-1 40.5812-122.394
118 15772 CATCHBASIN CITY1 FTC01C-1 40.5812-122.393
119 15773 CATCHBASIN CITY1 FTC01C-1 40.5811-122.393
120 17789 CATCHBASIN CITY1 FTC01C-1 40.58-122.388
121 17792 CATCHBASIN CITY1 FTC01C-1 40.5792-122.387
122 17793 CATCHBASIN CALTRANS1 FTC01C-1 40.5793-122.387 123 17806 CATCHBASIN CITY1 FTC01C-1 40.579-122.387
124 17817 CATCHBASIN CALTRANS1 FTC01C-1 40.5803-122.388 125 17818 CATCHBASIN CALTRANS1 FTC01C-1 40.5802-122.388 126 17819 CATCHBASIN CITY1 FTC01C-1 40.5802-122.388
127 17421 CATCHBASIN CITY1 FTC01C-1 40.5856-122.395
128 17422 CATCHBASIN CALTRANS1 FTC01C-1 40.5875-122.393 129 17426 CATCHBASIN CITY1 FTC01C-1 40.5875-122.394
130 17427 CATCHBASIN CITY1 FTC01C-1 40.5875-122.394
131 18666 AREADRAIN CITY1 FTC01C-1 40.5809-122.397
132 17310 CATCHBASIN CITY1 FTC01C-1 40.5854-122.397
133 18724 CATCHBASIN CITY1 FTC01C-1 40.5792-122.387
134 18717 CATCHBASIN CALTRANS1 FTC01C-1 40.5874-122.394 135 17261 CATCHBASIN CITY1 FTC01C-1 40.5846-122.398
136 17262 CATCHBASIN CITY1 FTC01C-1 40.5847-122.398
137 17265 CATCHBASIN CITY1 FTC01C-1 40.5851-122.398
138 17266 CATCHBASIN CITY1 FTC01C-1 40.5801-122.399
139 17411 CATCHBASIN CITY1 FTC01C-1 40.5817-122.388
140 17412 CATCHBASIN CITY1 FTC01C-1 40.5823-122.39
141 17413 CATCHBASIN CITY1 FTC01C-1 40.5823-122.39
142 17414 CATCHBASIN CITY1 FTC01C-1 40.5825-122.39
143 17417 CATCHBASIN CITY1 FTC01C-1 40.5822-122.39
144 17418 CATCHBASIN CALTRANS1 FTC01C-1 40.5818-122.388 145 17419 CATCHBASIN CITY1 FTC01C-1 40.5816-122.388
146 17329 CATCHBASIN CITY1 FTC01C-1 40.5812-122.395
147 17331 CATCHBASIN CITY1 FTC01C-1 40.585-122.396
148 17332 CATCHBASIN CITY1 FTC01C-1 40.5833-122.396
149 17341 CATCHBASIN CITY1 FTC01C-1 40.5808-122.396
150 17342 CATCHBASIN CITY1 FTC01C-1 40.5811-122.396
151 17358 CATCHBASIN CITY1 FTC01C-1 40.5816-122.394
152 17360 CATCHBASIN CITY1 FTC01C-1 40.5813-122.394
Packet Pg. 441 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
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City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
153 17362 CATCHBASIN CITY1 FTC01C-1 40.5813-122.395
154 17367 CATCHBASIN CITY1 FTC01C-1 40.5791-122.392
155 17356 AREADRAIN CITY1 FTC01C-1 40.5826-122.394
156 18869 CATCHBASIN CITY1 FTC01C-1 40.5826-122.393
157 18868 CATCHBASIN CITY1 FTC01C-1 40.5824-122.394
158 15106 CATCHBASIN CITY1 FTC01C-1 40.5824-122.394
159 17357 CATCHBASIN CITY1 FTC01C-1 40.5825-122.394
160 15006 AREADRAIN CITY1 FTC01C-1 40.5808-122.392
161 15101 CATCHBASIN CITY1 FTC01C-1 40.5822-122.391
162 15111 AREADRAIN CITY1 FTC01C-1 40.585-122.393
163 18746 CATCHBASIN CITY1 FTC01C-1 40.5842-122.393
164 15763 AREADRAIN CITY1 FTC01C-1 40.5768-122.392
165 17258 CATCHBASIN CITY1 FTC01C-1 40.5803-122.4
166 17389 CATCHBASIN CALTRANS1 FTC01C-1 40.5822-122.391 167 17392 CATCHBASIN CITY1 FTC01C-1 40.581-122.392
168 17364 CATCHBASIN CITY1 FTC01C-1 40.5799-122.389
169 18748 AREADRAIN CITY1 FTC01C-1 40.5833-122.393
170 18721 CATCHBASIN CALTRANS1 FTC01C-1 40.5799-122.389 171 18432 AREADRAIN CITY1 FTC01C-1 40.583-122.392
172 19863 AREADRAIN CITY1 FTC01C-1 40.5838-122.393
173 20060 CATCHBASIN CITY1 FTC01C-1 40.5759-122.392
174 15702 AREADRAIN CITY1 FTC01C-1 40.5744-122.38
175 17748 CATCHBASIN CITY1 FTC01C-1 40.5741-122.379
176 17802 CATCHBASIN CALTRANS1 FTC01C-1 40.5767-122.387 177 17839 CATCHBASIN CITY1 FTC01C-1 40.5768-122.381
178 20485 AREADRAIN CITY1 FTC01C-1 40.575-122.38
179 20486 AREADRAIN CITY1 FTC01C-1 40.5751-122.38
180 18735 CATCHBASIN CITY1 FTC01C-1 40.5746-122.381
181 17242 CATCHBASIN CITY1 FTC01C-1 40.5826-122.403
182 17243 CATCHBASIN CITY1 FTC01C-1 40.5828-122.402
183 17311 CATCHBASIN CITY1 FTC01C-1 40.5851-122.393
184 17378 CATCHBASIN CALTRANS1 FTC01C-1 40.5804-122.39
185 17382 CATCHBASIN CALTRANS1 FTC01C-1 40.5851-122.392 186 17383 CATCHBASIN CALTRANS1 FTC01C-1 40.585-122.392
187 17384 CATCHBASIN CALTRANS1 FTC01C-1 40.585-122.392
188 17385 CATCHBASIN CALTRANS1 FTC01C-1 40.5849-122.393 189 17386 CATCHBASIN CITY1 FTC01C-1 40.5852-122.393
190 17390 CATCHBASIN CITY1 FTC01C-1 40.5802-122.391
Packet Pg. 442 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
-11
#
City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
191 17393 CATCHBASIN CALTRANS1 FTC01C-1 40.5803-122.391 192 17398 CATCHBASIN CITY1 FTC01C-1 40.5803-122.392
193 17415 CATCHBASIN CITY1 FTC01C-1 40.5804-122.39
194 17416 CATCHBASIN CITY1 FTC01C-1 40.5806-122.391
195 17370 CATCHBASIN CITY1 FTC01C-1 40.5789-122.389
196 15725 AREADRAIN CITY1 FTC01C-1 40.5773-122.389
197 17308 CATCHBASIN CITY1 FTC01C-1 40.5856-122.393
198 17374 CATCHBASIN CITY1 FTC01C-1 40.5755-122.389
199 17372 CATCHBASIN CITY1 FTC01C-1 40.5757-122.389
200 15098 AREADRAIN CITY1 FTC01C-1 40.5824-122.391
201 17257 CATCHBASIN CITY1 FTC01C-1 40.5832-122.402
202 17896 CATCHBASIN CITY1 FTC01C-1 40.5758-122.378
203 15096 AREADRAIN CITY1 FTC01C-1 40.583-122.39
204 20731 AREADRAIN CITY1 FTC01C-1 40.5824-122.392
205 17328 CATCHBASIN CITY1 FTC01C-1 40.581-122.395
206 17361 CATCHBASIN CITY1 FTC01C-1 40.5806-122.395
207 15770 AREADRAIN CITY1 FTC01C-1 40.581-122.394
208 17351 CATCHBASIN CITY1 FTC01C-1 40.5834-122.395
209 19647 AREADRAIN CITY1 FTC01C-1 40.5837-122.394
210 17321 CATCHBASIN CITY1 FTC01C-1 40.5787-122.394
211 18897 CATCHBASIN CITY1 FTC01C-1 40.5786-122.394
212 17368 CATCHBASIN CITY1 FTC01C-1 40.579-122.392
213 15569 CATCHBASIN CITY1 FTC01C-1 40.5861-122.393
214 17429 CATCHBASIN CITY1 FTC01C-1 40.5862-122.393
215 17430 CATCHBASIN CITY1 FTC01C-1 40.5868-122.393
216 15564 AREADRAIN CITY1 FTC01C-1 40.5868-122.393
217 17439 CATCHBASIN CITY1 FTC01C-1 40.5863-122.392
218 17428 AREADRAIN CITY1 FTC01C-1 40.5861-122.393
219 20246 CATCHBASIN CITY1 FTC01C-1 40.5785-122.396
220 23254 AREADRAIN CITY1 FTC01C-1 40.5846-122.396
221 17345 CATCHBASIN CITY1 FTC01C-1 40.5804-122.397
222 17423 CATCHBASIN CALTRANS1 FTC01C-1 40.5873-122.393 223 23519 CATCHBASIN CALTRANS1 FTC01C-1 40.5872-122.394 224 15700 AREADRAIN CITY1 FTC01C-1 40.5738-122.379
225 10044 CATCHBASIN CITY1 FTC01C-1 40.5734-122.377
226 18855 CATCHBASIN CITY1 FTC01C-1 40.5831-122.402
227 23564 CATCHBASIN CITY1 FTC01C-1 40.5823-122.395
228 23889 CATCHBASIN CITY1 FTC01C-1 40.577-122.392
Packet Pg. 443 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
-12
#
City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
229 17397 CATCHBASIN CITY1 FTC01C-1 40.582-122.392
230 17335 CATCHBASIN CITY1 FTC01C-1 40.5852-122.397
231 17309 CATCHBASIN CITY1 FTC01C-1 40.5853-122.397
232 17844 AREADRAIN CITY1 FTC01C-1 40.5752-122.381
233 17274 CATCHBASIN CITY1 FTC01A 40.5892-122.403
234 17278 CATCHBASIN CITY1 FTC01A 40.5901-122.404
235 17291 CATCHBASIN CITY1 FTC01A 40.5893-122.4
236 15612 AREADRAIN CITY1 FTC01A 40.5897-122.403
237 17275 CATCHBASIN CITY1 FTC01A 40.5895-122.402
238 23697 AREADRAIN CITY1 FTC01A 40.5895-122.402
239 17292 CATCHBASIN CITY1 FTC01A 40.5887-122.399
240 15327 CATCHBASIN CITY2 NA 40.556-122.362
241 15330 CATCHBASIN CITY2 NA 40.5555-122.362
242 15334 AREADRAIN CITY2 NA 40.5547-122.362
243 15326 AREADRAIN CITY2 NA 40.5564-122.363
244 17949 CATCHBASIN CITY2 NA 40.5552-122.362
245 18016 CATCHBASIN CITY2 NA 40.5768-122.361
246 11356 AREADRAIN CITY2 NA 40.56-122.357
247 15687 AREADRAIN CITY2 FTC03C 40.568-122.372
248 10826 CATCHBASIN CITY2 FTC02A 40.5542-122.353
249 11345 CATCHBASIN CITY2 FTC02A 40.5494-122.353
250 11347 CATCHBASIN CITY2 FTC02A 40.5488-122.353
251 11348 CATCHBASIN CITY2 FTC02A 40.5492-122.353
252 11346 CATCHBASIN CITY2 FTC02A 40.5509-122.353
253 17967 CATCHBASIN CITY3 NA 40.5727-122.369
254 19729 CATCHBASIN CITY3 NA 40.5731-122.368
255 18669 AREADRAIN CITY3 NA 40.5721-122.362
256 17976 CATCHBASIN CITY3 NA 40.5727-122.366
257 17994 CATCHBASIN CITY3 NA 40.5726-122.363
258 17995 CATCHBASIN CITY3 NA 40.572-122.363
259 17999 CATCHBASIN CITY3 NA 40.5721-122.364
260 18000 CATCHBASIN CITY3 NA 40.5726-122.364
261 18002 CATCHBASIN CITY3 NA 40.572-122.363
262 18005 CATCHBASIN CITY3 NA 40.5735-122.365
263 18007 CATCHBASIN CITY3 NA 40.5721-122.363
264 19673 AREADRAIN CITY3 NA 40.5723-122.364
265 11125 CATCHBASIN CITY3 NA 40.5791-122.354
266 11126 CATCHBASIN CITY3 NA 40.5801-122.354
Packet Pg. 444 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
-13
#
City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
267 10714 AREADRAIN CITY3 NA 40.5755-122.358
268 11212 CATCHBASIN CITY3 NA 40.5773-122.355
269 11422 CATCHBASIN CITY3 NA 40.5736-122.353
270 11425 CATCHBASIN CITY3 NA 40.5763-122.358
271 11426 CATCHBASIN CITY3 NA 40.5776-122.358
272 11427 CATCHBASIN CITY3 NA 40.5755-122.358
273 11429 CATCHBASIN CITY3 NA 40.5786-122.358
274 11430 CATCHBASIN CITY3 NA 40.5767-122.358
275 11431 CATCHBASIN CITY3 NA 40.5768-122.359
276 11434 CATCHBASIN CITY3 NA 40.5773-122.358
277 11435 CATCHBASIN CITY3 NA 40.5753-122.356
278 11437 CATCHBASIN CITY3 NA 40.5764-122.358
279 11438 CATCHBASIN CITY3 NA 40.5774-122.358
280 11440 CATCHBASIN CITY3 NA 40.5757-122.358
281 11441 CATCHBASIN CITY3 NA 40.5752-122.358
282 11448 CATCHBASIN CITY3 NA 40.5803-122.358
283 11450 CATCHBASIN CITY3 NA 40.5801-122.358
284 11453 CATCHBASIN CITY3 NA 40.5786-122.354
285 11454 CATCHBASIN CITY3 NA 40.5772-122.353
286 11457 CATCHBASIN CITY3 NA 40.5754-122.354
287 11458 CATCHBASIN CITY3 NA 40.5785-122.355
288 11459 CATCHBASIN CITY3 NA 40.5781-122.355
289 11467 CATCHBASIN CITY3 NA 40.5756-122.352
290 11469 CATCHBASIN CITY3 NA 40.5779-122.353
291 11470 CATCHBASIN CITY3 NA 40.579-122.353
292 11471 CATCHBASIN CITY3 NA 40.5756-122.353
293 11474 CATCHBASIN CITY3 NA 40.5748-122.352
294 11476 CATCHBASIN CITY3 NA 40.5753-122.353
295 12011 CATCHBASIN CITY3 NA 40.5748-122.35
296 12012 CATCHBASIN CITY3 NA 40.5747-122.35
297 13113 CATCHBASIN CITY3 NA 40.5756-122.349
298 13011 CATCHBASIN CITY3 NA 40.5753-122.355
299 11408 CATCHBASIN CITY3 NA 40.5723-122.353
300 11420 CATCHBASIN CITY3 NA 40.5717-122.353
301 11423 CATCHBASIN CITY3 NA 40.5709-122.352
302 14209 CATCHBASIN CITY3 NA 40.5712-122.35
303 14213 AREADRAIN CITY3 NA 40.5728-122.35
304 11412 CATCHBASIN CITY3 NA 40.5729-122.355
Packet Pg. 445 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
-14
#
City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
305 11409 CATCHBASIN CITY3 NA 40.5734-122.353
306 11416 CATCHBASIN CITY3 NA 40.5741-122.355
307 11428 CATCHBASIN CITY3 NA 40.5746-122.358
308 11269 CATCHBASIN CITY3 NA 40.5822-122.355
309 11417 CATCHBASIN CITY3 NA 40.5725-122.353
310 11421 CATCHBASIN CITY3 NA 40.5724-122.353
311 11451 CATCHBASIN CITY3 NA 40.5829-122.358
312 11452 CATCHBASIN CITY3 NA 40.5829-122.358
313 11473 CATCHBASIN CITY3 NA 40.5748-122.351
314 11477 CATCHBASIN CITY3 NA 40.5747-122.351
315 12013 CATCHBASIN CITY3 NA 40.5748-122.351
316 12997 CATCHBASIN CITY3 NA 40.5827-122.358
317 21177 AREADRAIN CITY3 NA 40.5762-122.354
318 11455 CATCHBASIN CITY3 NA 40.5785-122.354
319 12903 CATCHBASIN CITY3 NA 40.5783-122.354
320 11462 CATCHBASIN CITY3 NA 40.5759-122.355
321 11463 CATCHBASIN CITY3 NA 40.5759-122.355
322 11456 CATCHBASIN CITY3 NA 40.5793-122.354
323 17657 CATCHBASIN CITY3 FTC03D 40.5716-122.37
324 17977 CATCHBASIN CITY3 FTC03D 40.5713-122.367
325 23414 CATCHBASIN CITY3 FTC03D 40.5716-122.371
326 23408 CATCHBASIN CITY3 FTC03D 40.5716-122.37
327 11439 CATCHBASIN CITY3 NA 40.5787-122.358
328 10851 CATCHBASIN CITY3 NA 40.582-122.358
329 17950 CATCHBASIN CITY3 FTC03A-1 40.5613-122.362
330 15318 AREADRAIN CITY3 FTC03A-1 40.5608-122.363
331 15319 AREADRAIN CITY3 FTC03A-1 40.5613-122.363
332 17978 AREADRAIN CITY3 FTC03A-1 40.5666-122.363
333 17987 CATCHBASIN CITY3 FTC03A-1 40.5654-122.363
334 17988 CATCHBASIN CITY3 FTC03A-1 40.5662-122.363
335 17991 CATCHBASIN CITY3 FTC03A-1 40.5639-122.362
336 17992 CATCHBASIN CITY3 FTC03A-1 40.5639-122.362
337 11377 CATCHBASIN CITY3 FTC03A-1 40.5647-122.356
338 11379 CATCHBASIN CITY3 FTC03A-1 40.5682-122.359
339 11381 CATCHBASIN CITY3 FTC03A-1 40.5673-122.359
340 11387 CATCHBASIN CITY3 FTC03A-1 40.5675-122.357
341 11394 CATCHBASIN CITY3 FTC03A-1 40.5678-122.353
342 11395 CATCHBASIN CITY3 FTC03A-1 40.5647-122.353
Packet Pg. 446 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
-15
#
City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
343 11396 CATCHBASIN CITY3 FTC03A-1 40.5648-122.353
344 11406 AREADRAIN CITY3 FTC03A-1 40.5648-122.353
345 13896 CATCHBASIN CITY3 FTC03A-1 40.5675-122.357
346 14519 CATCHBASIN CITY3 FTC03A-1 40.5686-122.354
347 11398 CATCHBASIN CITY3 FTC03A-1 40.5682-122.356
348 11405 CATCHBASIN CITY3 FTC03A-1 40.5652-122.353
349 11407 CATCHBASIN CITY3 FTC03A-1 40.5674-122.353
350 14520 AREADRAIN CITY3 FTC03A-1 40.5681-122.354
351 16407 AREADRAIN CITY3 FTC03A-1 40.5673-122.363
352 15286 AREADRAIN CITY3 FTC03A-1 40.5673-122.363
353 17986 CATCHBASIN CITY3 FTC03A-1 40.5674-122.363
354 17979 CATCHBASIN CITY3 FTC03A-1 40.5674-122.363
355 17981 AREADRAIN CITY3 FTC03A-1 40.568-122.363
356 23691 AREADRAIN CITY3 FTC03A-1 40.5607-122.364
357 17966 CATCHBASIN CITY3 FTC03B-1 40.5709-122.368
358 17972 CATCHBASIN CITY3 FTC03B-1 40.5708-122.368
359 18791 CATCHBASIN CALTRANS3 FTC03B-1 40.5712-122.361 360 18009 AREADRAIN CALTRANS3 FTC03B-1 40.5709-122.361
361 13645 AREADRAIN CALTRANS3 FTC03B-1 40.5709-122.36
362 13646 AREADRAIN CALTRANS3 FTC03B-1 40.5712-122.36
363 18829 AREADRAIN CITY3 FTC03B-1 40.57-122.365
364 18831 CATCHBASIN CITY3 FTC03B-1 40.57-122.365
365 18835 CATCHBASIN CITY3 FTC03B-1 40.5699-122.365
366 18785 AREADRAIN CITY3 FTC03B-1 40.5709-122.364
367 11389 CATCHBASIN CITY3 FTC03B-1 40.5712-122.358
368 11390 CATCHBASIN CITY3 FTC03B-1 40.5722-122.358
369 11393 CATCHBASIN CITY3 FTC03B-1 40.5732-122.358
370 11392 CATCHBASIN CITY3 FTC03B-1 40.5712-122.358
371 11388 CATCHBASIN CITY3 FTC03B-1 40.5723-122.358
372 15684 AREADRAIN CITY3 FTC03C 40.5692-122.372
373 17658 CATCHBASIN CITY3 FTC03C 40.5679-122.37
374 17959 CATCHBASIN CITY3 FTC03C 40.5658-122.369
375 17963 CATCHBASIN CITY3 FTC03C 40.5667-122.369
376 17964 CATCHBASIN CITY3 FTC03C 40.5637-122.365
377 19676 AREADRAIN CITY3 FTC03C 40.568-122.37
378 17973 CATCHBASIN CITY3 FTC03C 40.5703-122.369
379 15045 AREADRAIN CITY3 FTC03C 40.5683-122.368
380 15046 AREADRAIN CITY3 FTC03C 40.5685-122.368
Packet Pg. 447 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
-16
#
City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
381 16522 CATCHBASIN CITY3 FTC03C 40.5683-122.368
382 16524 CATCHBASIN CITY3 FTC03C 40.5691-122.368
383 17659 CATCHBASIN CITY3 FTC03C 40.5696-122.37
384 16565 CATCHBASIN CITY3 FTC03C 40.5696-122.369
385 17955 CATCHBASIN CITY3 FTC03C 40.568-122.369
386 10131 AREADRAIN CITY4 NA 40.5906-122.353
387 11127 CATCHBASIN CITY4 NA 40.5894-122.351
388 11165 CATCHBASIN CITY4 NA 40.5856-122.346
389 11168 CATCHBASIN CITY4 NA 40.5858-122.347
390 11507 AREADRAIN CITY4 NA 40.591-122.354
391 11514 CATCHBASIN CITY4 NA 40.5862-122.353
392 11515 CATCHBASIN CITY4 NA 40.5864-122.353
393 12003 CATCHBASIN CITY4 NA 40.5856-122.347
394 12103 CATCHBASIN CITY4 NA 40.5868-122.345
395 13003 CATCHBASIN CITY4 NA 40.5859-122.355
396 14172 AREADRAIN CITY4 NA 40.5859-122.347
397 14652 AREADRAIN CITY4 NA 40.5895-122.351
398 11505 CATCHBASIN CITY4 NA 40.5876-122.353
399 10786 CATCHBASIN CITY4 NA 40.5908-122.351
400 11510 AREADRAIN CITY4 NA 40.5894-122.353
401 11508 AREADRAIN CITY4 NA 40.5892-122.353
402 10345 AREADRAIN CITY4 FTC04A-1 40.585-122.35
403 10884 CATCHBASIN CITY4 NA 40.5885-122.353
404 11341 CATCHBASIN CITY4 FTC04A-1 40.5864-122.351
405 11216 CATCHBASIN CITY4 FTC04A-1 40.5888-122.35
406 12040 CATCHBASIN CITY4 FTC04A-1 40.5889-122.349
407 12041 CATCHBASIN CITY4 FTC04A-1 40.5897-122.349
408 12049 CATCHBASIN CITY4 FTC04A-1 40.5884-122.351
409 12053 CATCHBASIN CITY4 FTC04A-1 40.5859-122.349
410 12056 CATCHBASIN CITY4 FTC04A-1 40.5858-122.35
411 11512 CATCHBASIN CITY4 FTC04A-1 40.5862-122.352
412 12064 CATCHBASIN CITY4 FTC04A-1 40.588-122.347
413 12066 CATCHBASIN CITY4 FTC04A-1 40.5859-122.347
414 21201 AREADRAIN CITY4 FTC04A-1 40.5885-122.349
415 12039 CATCHBASIN CITY4 FTC04B-1 40.5881-122.346
416 12092 CATCHBASIN CITY4 FTC04B-1 40.5893-122.345
417 12095 CATCHBASIN CITY4 FTC04B-1 40.5906-122.345
418 12098 CATCHBASIN CITY4 FTC04B-1 40.5907-122.345
Packet Pg. 448 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
-17
#
City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
419 12102 CATCHBASIN CITY4 FTC04B-1 40.5906-122.346
420 12173 CATCHBASIN CITY4 FTC04B-1 40.5858-122.339
421 23344 AREADRAIN CITY4 FTC04B-1 40.5866-122.341
422 12113 CATCHBASIN CITY4 FTC04B-1 40.5879-122.343
423 12034 CATCHBASIN CITY4 FTC04C 40.5856-122.343
424 12035 CATCHBASIN CITY4 FTC04C 40.5855-122.344
425 12171 CATCHBASIN CITY4 FTC04C 40.5857-122.341
426 12131 CATCHBASIN CITY4 FTC04C 40.5855-122.34
427 12144 CATCHBASIN CITY4 FTC04C 40.5856-122.341
428 12145 CATCHBASIN CITY4 FTC04C 40.5854-122.339
429 12147 CATCHBASIN CITY4 FTC04C 40.5844-122.339
430 12146 CATCHBASIN CITY4 FTC04C 40.5856-122.339
431 11484 CATCHBASIN CITY4 FTC04D 40.5886-122.358
432 11487 CATCHBASIN CITY4 FTC04D 40.5862-122.356
433 11494 CATCHBASIN CITY4 FTC04D 40.5913-122.358
434 11495 CATCHBASIN CITY4 FTC04D 40.5931-122.358
435 12765 CATCHBASIN CITY4 FTC04D 40.5869-122.358
436 12766 CATCHBASIN CITY4 FTC04D 40.5861-122.357
437 21025 CATCHBASIN CITY4 FTC04D 40.5862-122.358
438 11491 CATCHBASIN CITY4 FTC04D 40.5873-122.358
439 23109 CATCHBASIN CITY4 FTC04D 40.5929-122.358
440 23455 AREADRAIN CITY4 FTC04D 40.5879-122.358
441 11502 CATCHBASIN CITY4 FTC04D 40.5932-122.358
442 15381 CATCHBASIN CITY5 40.6299-122.377
443 18218 CATCHBASIN CITY5 NA 40.6319-122.39
444 18219 CATCHBASIN CITY5 NA 40.6319-122.39
445 18313 CATCHBASIN CITY5 NA 40.6245-122.381
446 18328 CATCHBASIN CITY5 NA 40.632-122.383
447 18338 CATCHBASIN CITY5 NA 40.6256-122.375
448 18340 CATCHBASIN CITY5 NA 40.6247-122.373
449 18343 CATCHBASIN CITY5 NA 40.6237-122.373
450 18345 CATCHBASIN CITY5 NA 40.6226-122.374
451 18351 CATCHBASIN CITY5 NA 40.6285-122.373
452 18352 CATCHBASIN CITY5 NA 40.6284-122.373
453 18353 CATCHBASIN CITY5 NA 40.6256-122.373
454 18356 CATCHBASIN CITY5 NA 40.6316-122.379
455 18357 CATCHBASIN CITY5 NA 40.6311-122.375
456 12257 CATCHBASIN CITY6 NA 40.5651-122.324
Packet Pg. 449 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
-18
#
City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
457 12259 CATCHBASIN CITY6 NA 40.5639-122.324
458 12261 CATCHBASIN CITY6 NA 40.5663-122.325
459 12301 CATCHBASIN CITY6 NA 40.5653-122.32
460 12304 CATCHBASIN CITY6 NA 40.5651-122.32
461 11949 CATCHBASIN CITY6 NA 40.5621-122.339
462 11951 CATCHBASIN CITY6 NA 40.5609-122.339
463 12239 CATCHBASIN CITY6 NA 40.5636-122.328
464 11342 CATCHBASIN CITY6 NA 40.5609-122.351
465 13039 CATCHBASIN CITY6 NA 40.5636-122.34
466 11874 AREADRAIN CITY6 NA 40.5636-122.342
467 10659 AREADRAIN CITY6 NA 40.5656-122.346
468 10662 AREADRAIN CITY6 NA 40.5645-122.346
469 11372 CATCHBASIN CITY6 NA 40.561-122.353
470 11893 CATCHBASIN CITY6 NA 40.5637-122.35
471 11894 CATCHBASIN CITY6 NA 40.5637-122.35
472 11895 CATCHBASIN CITY6 NA 40.5639-122.35
473 11897 CATCHBASIN CITY6 NA 40.5639-122.347
474 11898 CATCHBASIN CITY6 NA 40.5639-122.347
475 11899 CATCHBASIN CITY6 NA 40.5637-122.347
476 11902 CATCHBASIN CITY6 NA 40.571-122.351
477 11903 CATCHBASIN CITY6 NA 40.571-122.35
478 10667 AREADRAIN CITY6 NA 40.564-122.349
479 11403 CATCHBASIN CITY6 NA 40.5637-122.353
480 11901 CATCHBASIN CITY6 NA 40.5637-122.348
481 21072 AREADRAIN CITY6 NA 40.5652-122.35
482 10488 AREADRAIN CITY6 NA 40.5639-122.32
483 10646 AREADRAIN CITY6 FTC06A-1 40.5674-122.345
484 11988 CATCHBASIN CITY6 FTC06A-1 40.5711-122.341
485 11872 CATCHBASIN CITY6 FTC06A-1 40.5709-122.342
486 11908 CATCHBASIN CITY6 FTC06A-1 40.5651-122.345
487 11913 CATCHBASIN CITY6 FTC06A-1 40.5711-122.342
488 23146 CATCHBASIN CITY6 FTC06A-1 40.5693-122.34
489 23149 CATCHBASIN CITY6 FTC06A-1 40.569-122.339
490 23818 AREADRAIN CITY6 FTC06A-1 40.5712-122.342
491 25134 CATCHBASIN CITY6 FTC06A-1 40.57-122.34
492 25056 CATCHBASIN CITY6 NA 40.5638-122.328
493 15785 AREADRAIN CITY7 NA 40.5742-122.391
494 17221 CATCHBASIN CITY7 NA 40.5731-122.391
Packet Pg. 450 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
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#
City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
495 17545 CATCHBASIN CITY7 NA 40.5344-122.384
496 18534 AREADRAIN CITY7 NA 40.5195-122.381
497 15736 AREADRAIN CITY7 NA 40.5712-122.386
498 17713 CATCHBASIN CITY7 NA 40.5684-122.381
499 17743 CATCHBASIN CITY7 NA 40.5703-122.383
500 17745 CATCHBASIN CITY7 NA 40.5708-122.382
501 17746 CATCHBASIN CITY7 NA 40.5704-122.383
502 17771 CATCHBASIN CITY7 NA 40.5694-122.378
503 17689 CATCHBASIN CITY7 NA 40.5708-122.384
504 17662 CATCHBASIN CITY7 NA 40.5691-122.379
505 17691 CATCHBASIN CITY7 NA 40.5697-122.384
506 17695 CATCHBASIN CITY7 NA 40.5679-122.381
507 19155 AREADRAIN CITY7 NA 40.5712-122.385
508 17563 AREADRAIN CITY7 NA 40.5496-122.388
509 17564 AREADRAIN CITY7 NA 40.5495-122.388
510 17704 CATCHBASIN CITY7 NA 40.5641-122.382
511 17720 CATCHBASIN CITY7 NA 40.5637-122.38
512 17726 CATCHBASIN CITY7 NA 40.5639-122.381
513 17666 CATCHBASIN CITY7 NA 40.5604-122.386
514 16542 CATCHBASIN CITY7 NA 40.5375-122.389
515 15861 AREADRAIN CITY7 NA 40.5485-122.387
516 15884 AREADRAIN CITY7 NA 40.5348-122.385
517 15898 AREADRAIN CITY7 NA 40.5196-122.384
518 17503 CATCHBASIN CITY7 NA 40.5205-122.382
519 17505 CATCHBASIN CITY7 NA 40.5181-122.382
520 17501 CATCHBASIN CITY7 NA 40.5223-122.383
521 17502 CATCHBASIN CITY7 NA 40.5214-122.383
522 16882 CATCHBASIN CITY7 NA 40.5347-122.388
523 17549 CATCHBASIN CITY7 NA 40.5326-122.385
524 17552 CATCHBASIN CITY7 NA 40.5388-122.386
525 17553 CATCHBASIN CITY7 NA 40.5356-122.387
526 17479 CATCHBASIN CITY7 NA 40.5171-122.382
527 17565 CATCHBASIN CITY7 NA 40.5464-122.387
528 18451 CATCHBASIN CITY7 NA 40.5331-122.385
529 20052 CATCHBASIN CITY7 NA 40.5249-122.383
530 19627 AREADRAIN CITY7 NA 40.5354-122.387
531 21004 AREADRAIN CALTRANS7 NA 40.5292-122.383
532 17189 CATCHBASIN CITY7 NA 40.5544-122.39
Packet Pg. 451 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
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City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
533 15860 AREADRAIN CITY7 NA 40.5474-122.387
534 19702 AREADRAIN CITY7 NA 40.5418-122.386
535 17546 CATCHBASIN CITY7 NA 40.5293-122.384
536 15902 AREADRAIN CITY7 NA 40.5227-122.384
537 15065 AREADRAIN CITY7 NA 40.5377-122.384
538 17554 CATCHBASIN CITY7 NA 40.539-122.385
539 15868 AREADRAIN CITY7 NA 40.5383-122.384
540 17561 CATCHBASIN CITY7 NA 40.5374-122.383
541 15862 AREADRAIN CITY7 NA 40.5461-122.387
542 19862 CATCHBASIN CITY7 NA 40.5675-122.385
543 17731 CATCHBASIN CITY7 NA 40.5652-122.38
544 17719 CATCHBASIN CITY7 NA 40.5652-122.38
545 17227 CATCHBASIN CITY7 NA 40.574-122.392
546 17684 AREADRAIN CITY7 NA 40.5735-122.387
547 17692 CATCHBASIN CITY7 NA 40.5731-122.386
548 17687 CATCHBASIN CITY7 NA 40.5727-122.385
549 17676 CATCHBASIN CITY7 NA 40.5723-122.383
550 17736 CATCHBASIN CITY7 NA 40.5719-122.382
551 17737 CATCHBASIN CITY7 NA 40.5717-122.382
552 17754 CATCHBASIN CITY7 NA 40.5711-122.38
553 17752 CATCHBASIN CITY7 NA 40.571-122.38
554 16489 CATCHBASIN CITY7 NA 40.5673-122.385
555 23420 CATCHBASIN CITY7 NA 40.573-122.377
556 23423 CATCHBASIN CITY7 NA 40.5719-122.377
557 17557 CATCHBASIN CITY7 NA 40.5306-122.382
558 17226 CATCHBASIN CITY7 NA 40.5733-122.392
559 15787 AREADRAIN CITY7 FTC07A 40.5687-122.391
560 17210 CATCHBASIN CITY7 FTC07A 40.5677-122.39
561 17211 CATCHBASIN CITY7 FTC07A 40.5673-122.39
562 15741 AREADRAIN CITY7 FTC07A 40.5684-122.387
563 19176 CATCHBASIN CALTRANS7 FTC07A 40.569-122.388
564 15744 AREADRAIN CITY7 FTC07A 40.5691-122.389
565 15745 CATCHBASIN CALTRANS7 FTC07A 40.5691-122.388
566 16834 AREADRAIN CALTRANS7 FTC07A 40.57-122.388
567 17682 CATCHBASIN CITY7 FTC07A 40.5636-122.385
568 19169 CATCHBASIN CITY7 FTC07A 40.5668-122.389
569 19177 CATCHBASIN CITY7 FTC07A 40.5686-122.388
570 19179 CATCHBASIN CALTRANS7 FTC07A 40.5688-122.388
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City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
571 19180 CATCHBASIN CALTRANS7 FTC07A 40.5685-122.388
572 19187 CATCHBASIN CITY7 FTC07A 40.5646-122.385
573 21814 AREADRAIN CITY7 FTC07A 40.5655-122.386
574 21815 AREADRAIN CITY7 FTC07A 40.5652-122.387
575 17218 CATCHBASIN CITY7 FTC07A 40.5685-122.389
576 21812 AREADRAIN CITY7 FTC07A 40.5656-122.386
577 19156 AREADRAIN CITY7 FTC07A 40.5658-122.387
578 17214 CATCHBASIN CITY7 FTC07B-1 40.5649-122.391
579 17220 CATCHBASIN CITY7 FTC07B-1 40.5647-122.39
580 15801 AREADRAIN CALTRANS7 FTC07B-1 40.5659-122.388
581 15803 AREADRAIN CALTRANS7 FTC07B-1 40.5623-122.388
582 15793 AREADRAIN CITY7 FTC07B-1 40.5624-122.385
583 17679 CATCHBASIN CALTRANS7 FTC07B-1 40.5651-122.388 584 17683 CATCHBASIN CITY7 FTC07B-1 40.5634-122.385
585 19185 CATCHBASIN CALTRANS7 FTC07B-1 40.5642-122.387 586 15810 CATCHBASIN CALTRANS7 FTC07B-1 40.5651-122.388 587 21819 AREADRAIN CITY7 FTC07B-1 40.5647-122.387
588 15805 AREADRAIN CITY7 FTC07B-1 40.5636-122.389
589 17667 CATCHBASIN CITY7 FTC07C 40.559-122.387
590 15031 AREADRAIN CITY8 NA 40.6253-122.369
591 15232 AREADRAIN CALTRANS8 NA 40.6229-122.367
592 16576 CATCHBASIN CITY8 NA 40.6128-122.387
593 16578 CATCHBASIN CITY8 NA 40.6127-122.385
594 16580 CATCHBASIN CITY8 NA 40.6116-122.384
595 16582 CATCHBASIN CITY8 NA 40.6109-122.381
596 16583 CATCHBASIN CITY8 NA 40.6136-122.376
597 15362 AREADRAIN CITY8 NA 40.6251-122.368
598 15574 AREADRAIN CITY8 NA 40.6206-122.399
599 18264 CATCHBASIN CITY8 NA 40.6095-122.38
600 18279 CATCHBASIN CITY8 NA 40.6096-122.379
601 18280 CATCHBASIN CITY8 NA 40.6098-122.379
602 18173 CATCHBASIN CITY8 NA 40.6227-122.404
603 18174 CATCHBASIN CITY8 NA 40.6273-122.405
604 18175 CATCHBASIN CITY8 NA 40.6265-122.405
605 18181 CATCHBASIN CITY8 NA 40.6258-122.404
606 18151 CATCHBASIN CITY8 NA 40.6171-122.393
607 18392 CATCHBASIN CITY8 NA 40.6128-122.369
608 18393 CATCHBASIN CITY8 NA 40.6107-122.37
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City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
609 18394 CATCHBASIN CITY8 NA 40.611-122.369
610 18403 CATCHBASIN CITY8 NA 40.6228-122.368
611 19026 CATCHBASIN CITY8 NA 40.6121-122.378
612 19615 CATCHBASIN CITY8 NA 40.6112-122.368
613 20166 CATCHBASIN CITY8 NA 40.6241-122.368
614 18220 CATCHBASIN CITY8 NA 40.6424-122.367
615 14529 AREADRAIN CALTRANS8 NA 40.623-122.366
616 14528 AREADRAIN CALTRANS8 NA 40.6232-122.366
617 13634 CATCHBASIN CITY8 NA 40.6344-122.365
618 18400 CATCHBASIN CITY8 NA 40.6151-122.367
619 16587 CATCHBASIN CITY8 NA 40.6129-122.381
620 16573 CATCHBASIN CITY8 NA 40.6129-122.384
621 18293 CATCHBASIN CITY8 NA 40.6128-122.37
622 16581 CATCHBASIN CITY8 NA 40.6107-122.385
623 19619 CATCHBASIN CITY8 NA 40.6131-122.369
624 23849 CATCHBASIN CITY8 NA 40.6246-122.368
625 16585 CATCHBASIN CITY8 NA 40.6123-122.38
626 25150 AREADRAIN CITY8 NA 40.612-122.37
627 18256 CATCHBASIN CITY8 NA 40.6138-122.387
628 19555 CATCHBASIN CITY9 NA 40.6066-122.376
629 12790 CATCHBASIN CITY9 NA 40.5908-122.351
630 13558 CATCHBASIN CITY 10 NA 40.5764-122.324
631 13246 CATCHBASIN CITY 10 NA 40.5784-122.321
632 13249 CATCHBASIN CITY 10 NA 40.5784-122.32
633 20752 AREADRAIN CITY 10 NA 40.5762-122.324
634 14382 CATCHBASIN CITY 10 NA 40.5731-122.323
635 15617 AREADRAIN CITY 11 NA 40.5908-122.406
636 17106 CATCHBASIN CALTRANS 11 NA 40.5859-122.41
637 17108 CATCHBASIN CITY 11 NA 40.5858-122.409
638 18477 AREADRAIN CITY 11 NA 40.5891-122.405
639 17113 AREADRAIN CALTRANS 11 NA 40.5861-122.408
640 18226 CATCHBASIN CITY 12 NA 40.5988-122.387
641 16487 CATCHBASIN CITY 13 NA 40.5386-122.353
642 16488 CATCHBASIN CITY 13 NA 40.5389-122.354
643 11668 CATCHBASIN CITY 13 NA 40.5381-122.348
644 11293 CATCHBASIN CITY 14 NA 40.5027-122.305
645 14398 CATCHBASIN CITY 14 NA 40.4905-122.295
646 16659 CATCHBASIN CITY 15 NA 40.5733-122.416
Packet Pg. 454 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- D
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City's Catch
Basin ID Catch Basin Type Owner TMA
Large Full
Capture
Catchment
Latitude Longitude
647 16662 CATCHBASIN CITY 15 NA 40.5749-122.416
648 12382 CATCHBASIN CITY 15 NA 40.5785-122.321
649 12155 CATCHBASIN CITY 15 NA 40.5819-122.339
650 15329 AREADRAIN CITY 15 NA 40.5555-122.363
651 11464 CATCHBASIN CITY 15 NA 40.5795-122.353
652 14780 AREADRAIN CALTRANS 15 NA 40.5839-122.357
653 11906 CATCHBASIN CITY 15 NA 40.5712-122.347
654 10610 AREADRAIN CALTRANS 15 NA 40.5784-122.339
655 11443 CATCHBASIN CALTRANS 15 NA 40.5837-122.358
Packet Pg. 455 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- E-1
Appendix E
Cost Assumptions for Full Capture Systems
The cost estimates presented should be considered preliminary planning-level estimates and may not include all costs associated with the design, planning, purchase, construction/installation, and operation and maintenance associated with each potential full capture system. Assumptions associated with estimating the costs for small and large systems are included. Costs estimates presented are based on the most readily available information at the time this Evaluation was conducted. Comparisons of capital and on-going operation and maintenance (O&M) costs between small and large full capture systems are included to assist San Mateo with the evaluation of the most cost-effective approaches to achieving mandated trash load reductions. More detailed cost estimates will be needed should San Mateo decide to move forward with full capture systems (large or small).
Large Trash Full Capture Systems
Base (i.e., planning, design, materials, and construction) and maintenance costs for large trash full capture systems were calculated using the information compiled from a comprehensive review of cost estimates and bids from existing projects in the Bay Area. The base costs for hydrodynamic separators (HDSs), nutrient/debris separation baffle box (NSBB/DSBB), and gross solids removal devices (GSRD) generally increase with the expected 1-year flow, although each site will have specific considerations (e.g., utility conflicts and permitting) that must be accounted for to accurately estimate costs. To develop planning-level cost estimates, a power regression was developed based on the review of existing cost information.
The following assumptions were used to determine base costs for large trash full capture systems:
• The following formula was used to estimate base costs for baffle box devices: $520,499 x ln[Design Flow] – $1,000,000
• 30% of base costs are included in the final costs to account for design costs, administration, and construction contingencies;
• Systems are installed in areas which do not require major utility relocation, property or easement acquisition or environmental permitting;
• Systems in channels require the installation of a concrete pad, and may be significantly less expensive if the concrete is already installed;
• Total costs are presented in the assumed construction year (2019) dollars, and no financing or discounting costs are included;
• Large systems are assumed to have a lifetime of 50 years and will need to be replaced after this time; and
• Cost sharing agreements with other agencies such as Caltrans are not factored into this analysis.
Base costs are much higher for large full capture systems than small systems, however, they have significantly lower maintenance costs over the long-term. Lower maintenance costs often result in lower lifecycle costs for large systems, compared with small systems. Most costs associated with large systems are not associated with the system itself, rather with the planning, design, installation, utility conflicts, and permitting. Installation costs for large systems include mobilization and demobilization, traffic Packet Pg. 456 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- E-2
control, stormwater pollution prevention plan preparation, contractor’s markup, excavation, hauling, shoring, backfilling, dewatering, surface replacement, bypass pumping, diversion structure, and connections to the storm drainage system. As a result, the overall costs for designing, purchasing and constructing a large HDS or NSBB/DSBB system often exceed $1M.
The following assumptions were used to determine operation and maintenance cost estimates for large trash full capture systems:
• Baffle box devices require one maintenance event per year and in-channel netting devices require four maintenance events per year with each maintenance event taking seven hours; and • Each maintenance event requires one Vactor Truck Operator, one City Lead Storm Drain Maintenance Worker, and two temporary City Storm Drain Maintenance Workers at annual FTE rates of $121,700, $111,965, ad $92,240, respectively.
Figure D1 contains the estimated base cost curve for a baffle box system under different storm flows.
Many of these costs were derived from real cost data provided by Schaff and Wheeler. 8 Figure E1. Base cost (including 30% contingency costs) assumptions for a large underground Baffle Box system. 8 Also includes cities of Mountain View, San Bruno, San Mateo, South San Francisco and personal communication with Schaaf & Wheeler Consulting Engineers staff. Maintenance costs were provided by cities of San Jose and Vallejo Flood and Wastewater. Citations can be found in the References Section of this report. All base and O&M cost estimates presented in Table 9 were smoothed out using best fit regression curves.
$0
$200,000
$400,000
$600,000
$800,000
$1,000,000
$1,200,000
$1,400,000
$1,600,000
0 10 20 30 40 50 60 70
Base Cost
Design Flow (cfs)
Packet Pg. 457 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- E-3
Small Trash Full Capture Systems
The following assumptions were used to determine base costs for purchasing and installing small trash full capture systems:
• Connector pipe screens or catch basin inserts are assumed to be installed in catch basin with dimensions of 24” x 36”; and
• Manufacture and installation costs for each connector pipe screen or catch basin insert is $1,000 per system. Small systems vendors usually lump the costs of manufacturing and installation together.9
The following assumptions were used to determine cleaning, replacement and maintenance cost estimates:
• Connector pipe screens or catch basin inserts are cleaned an average of four times a year with each maintenance event lasting one hour;
• Each maintenance event requires one City Lead Storm Drain Maintenance Worker and one temporary City Storm Drain Maintenance Worker at an annual FTE rate of $121,700 and $61,655, respectively;
10 • Replacement of connector pipe screens and catch basin inserts is assumed to occur every 20 years; and
Replacement costs are $1,000, identical to initial manufacture/installation costs 9 Costs for small full capture systems can range from $450-2400 per system depending on the manufacturer and number of systems installed. 10 Annual FTE rates were provided by the City of Redding, and one full time equivalent position was assumed to be 2,000 staff hours in a given year. Although cost estimates in this report used City staff FTE rates, the City may choose to hire subcontractors. However, prices will vary depending on labor costs and the need to purchase equipment. Additionally, the City may be unable to hire non-union subcontractors to maintain the catch basins
Packet Pg. 458 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- F-1
Appendix F
Large System Siting and Sizing
When selecting a large trash full capture system, it is important to consider the size of the drainage area, hydraulic losses across the system when the system is full, the permitting requirements, system maintenance and access, property rights, and utility clearance. All factors should be weighed against the system type, construction costs and future operation and maintenance (O&M) costs to ensure maximum trash load reduction per dollar spent.
Large systems can be installed off-line from the main trunk with a diversion structure to re-direct the treatment flow rate. Off-line installations optimize system size since they are not required to have an overflow capacity equal to the capacity of the existing storm drain line. There is the potential for increasing the number of utility conflicts with an off-line installation since it requires a greater footprint for the facility. Existing utilities and right-of-way restrictions may dictate where a large system can be installed. When the City decides to move forward with implementation of any large trash full capture system, the location of existing utilities will need to be evaluated. The presence of utilities at proposed installation locations must be field verified prior to starting any system design.
For sizing large systems, the rational method for estimating peak runoff described in the Santa Clara County Drainage Manual (Schaaf and Wheeler, 2007) was used. This method has a long history of usefulness for stormwater conveyance system design in highly urbanized areas characterized by relatively small watersheds with largely impervious areas. The rational method uses the following equation to calculate peak runoff:
QT = k CiT A
Where: Q = peak discharge (cfs)
T = recurrence interval (years)
k = 1.008 (most often rounded to 1)
C = a dimensionless runoff coefficient
i = the design rainfall intensity (inches per hour) for a duration equal to the time of concentration11 for the basin A = drainage area (acres)
Runoff coefficients (C) described in the manual for soil hydrologic group D and listed in Table C1 were applied to the City’s land uses within the catchments or sub-catchments. A recurrence interval (T) of oneyear, consistent with the definition of a full capture system, was used. The design rainfall intensity (i) was developed for each catchment/sub-catchment using a formula provided the Drainage Manual. The intensity varies by catchment depending on the Time of Concentration, and therefore is a more accurate method than using a uniform rainfall intensity (i.e. the 1-year 1-hour storm). In general, the larger the catchment, the longer it will take the peak flow to reach a point downstream. This difference in time will cause the precipitation intensity (i) to vary by more than a factor of 2 depending on the catchment. 11 Time of Concentration is the time needed for water to flow from the most remote point of a catchment to the flow point, or can be thought of as the time between peak rainfall and peak flow. Rainfall intensity will vary significantly based on this length of time. Rainfall intensities were verified to match the National Oceanic and Atmospheric Administration (NOAA) precipitation frequency dataserver (http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html) Packet Pg. 459 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- F-2
Table C1. Runoff Coefficients for Sizing Large Systems
Land Use Runoff Coefficient (C)
Arterial Road 0.80
Commercial 0.80
Freeways 0.85
Industrial 0.75
Railroad 0.50
Rangeland/Forest 0.30
Residential - High Density 0.75
Residential - Low Density 0.45
Residential – Rural 0.40
Retail 0.80
Schools 0.60
Urban Open Space 0.45
Estimated treatment flow rates for all of the catchments and subcatchments were calculated using the rational method. Since the rational method is primarily used for catchments under 300 acres, a scaling factor was used to more closely approximate the one-year flow of larger catchments. The Water Board has indicated that a simplified rational method that uses a rainfall intensity of 0.2 in/hr is acceptable for sizing large systems over 50 acres if there is limited space available. However, that methodology would significantly undersize smaller large systems by more than half in many cases. It is better to use the more accurate calculation used in this evaluation for estimating the one-year flow so that there is less bypass of the treatment system.
A more advanced method using hydrologic modelling software such as the U.S Environmental Protection Agency (EPA) Storm Water Management Model (SWMM) or the U.S. Army Corps of Engineers Hydrologic Modeling System (HEC-HMS) could be used to more accurately calculate flows for larger catchments.
However, that is not necessary because all larger catchments would contain a diversion or large overflow to allow much of the higher flows to bypass the treatment system. Although it changes based on the characteristics of the catchment, a rough approximation of the relationship between catchment area and one-year flow is presented in Figure C1. Treatment flow rates for each of the catchments and subcatchments are listed in Table C2 and were used to estimate the sizes and costs of potential large trash full capture systems proposed to treat each catchment. Flow was reduced for Leslie Creek at the Wastewater Plant to account for using the channel for detention and the limitations of the pump station that would need to be installed as part of the system.
Packet Pg. 460 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost- F-3
Figure F1. Approximate relationship between catchment size and design one-year flow. 0 50
100
150
200
0 200 400 600 800 1,000 1,200
Design Flow (cfs)
Catchment Area (acres)
Packet Pg. 461 Attachment: Final Revised Draft Redding Trash CM Eval Report 20230503 (9.11(f)--Consider the COR Stormwater Trash Control Measures Cost-