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HomeMy WebLinkAboutMS 2021-0001; GARFIELD HOMES; TRASH CAPTURE STORM WATER QUALITY MANAGEMENT PLAN ( SWQMP); 2022-05-11 CITY OF CARLSBAD TRASH CAPTURE STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR GARFIELD HOMES MS/2021-001 DWG NO.: 533-6A GR. NO.: 2021-0035 ENGINEER OF WORK: Bryan A. Knapp R.C.E NO.: 86542 Expiration date: 03-31-2023 ___________________ PREPARED FOR: RREG Investments Series, LLC Series I039, A Delaware Limited Liability Company 5315 Avenida Encinas, Suite 200 Carlsbad, CA 92008 (949) 637-3254 PREPARED BY: PLSA Engineering 1911 San Diego Avenue, Suite 100 San Diego, CA 92110 (858) 259-8212 DATE: 5/11/2022 TABLE OF CONTENTS Certification Page Project Vicinity Map FORM E-34 Storm Water Standard Questionnaire Site Information FORM E-36 Standard Project Requirement Checklist Summary of Trash Capture Structural BMPs Attachment 1: Backup for Trash Capture BMPs Attachment 1a: DMA Exhibit Attachment 1b: Tabular Summary of DMAs Attachment 1c: Trash Capture BMP Design Calculations Attachment 2: Trash Capture BMP Maintenance Thresholds and Actions Attachment 3: Single Sheet BMP (SSBMP) Exhibit CERTIFICATION PAGE GARFIELD HOMES MS/2021-001 I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs for this project, and that I have exercised responsible charge over the design of the project as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the requirements of the BMP Design Manual, which is based on the requirements of SDRWQCB Order No. R9-2013-0001 (MS4 Permit) or the current Order. I have read and understand that the City Engineer has adopted minimum requirements for managing urban runoff, including storm water, from land development activities, as described in the BMP Design Manual. I certify that this SWQMP has been completed to the best of my ability and accurately reflects the project being proposed and the applicable source control and site design BMPs proposed to minimize the potentially negative impacts of this project's land development activities on water quality. I understand and acknowledge that the plan check review of this SWQMP by the City Engineer is confined to a review and does not relieve me, as the Engineer in Responsible Charge of design of storm water BMPs for this project, of my responsibilities for project design. Bryan A. Knapp, R.C.E. NO. 86542, 3/31/2023 PLSA Engineering Company 5/11/2022 Date TAMAR C K A V E DATE A V EGA R F I E L D S TCAR L S B AD B L VD P A C I F I C O C E A N SITE CHIN Q U A PI N AVE VICINITY MAP NOT TO SCALE INSTRUCTIONS: To address post-development pollutants that may be generated from development projects, the city requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMPs) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual, refer to the Engineering Standards (Volume 5). This questionnaire must be completed by the applicant in advance of submitting for a development application (subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of storm water standards that must be applied to a proposed development or redevelopment project. Depending on the outcome, your project will either be subject to ‘STANDARD PROJECT’ requirements, ‘STANDARD PROJECT’ with TRASH CAPTURE REQUIREMENTS, or be subject to ‘PRIORITY DEVELOPMENT PROJECT’ (PDP) requirements. Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. If staff determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than initially assessed by you, this will result in the return of the development application as incomplete. In this case, please make the changes to the questionnaire and resubmit to the city. If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the questions, please seek assistance from Land Development Engineering staff. A completed and signed questionnaire must be submitted with each development project application. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently. PROJECT INFORMATION PROJECT NAME: APN: ADDRESS: The project is (check one): New Development Redevelopment The total proposed disturbed area is: ft2 ( ) acres The total proposed newly created and/or replaced impervious area is: ft2 ( ) acres If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the SWQMP # of the larger development project: Project ID SWQMP #: Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your application to the city. This Box for City Use Only City Concurrence: YES NO Date: Project ID: By: E-34 Page 1 of 4 REV 09/21 Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov STORM WATER STANDARDS QUESTIONNAIRE E-34 E-34 Page 2 of 4 REV 09/21 STEP 1 TO BE COMPLETED FOR ALL PROJECTS To determine if your project is a “development project”, please answer the following question: YES NO Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)? If you answered “yes” to the above question, provide justification below then go to Step 6, mark the box stating “my project is not a ‘development project’ and not subject to the requirements of the BMP manual” and complete applicant information. Justification/discussion: (e.g. the project includes only interior remodels within an existing building): If you answered “no” to the above question, the project is a ‘development project’, go to Step 2. STEP 2 TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provision E.3.b.(3), please answer the following questions: Is your project LIMITED to one or more of the following: YES NO 1. Constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria: a) Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non- erodible permeable areas; OR b) Designed and constructed to be hydraulically disconnected from paved streets or roads; OR c) Designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets guidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in accordance with the USEPA Green Streets guidance? 3. Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual? If you answered “yes” to one or more of the above questions, provide discussion/justification below, then go to Step 6, mark the second box stating “my project is EXEMPT from PDP …” and complete applicant information. Discussion to justify exemption ( e.g. the project redeveloping existing road designed and constructed in accordance with the USEPA Green Street guidance): If you answered “no” to the above questions, your project is not exempt from PDP, go to Step 3. E-34 Page 3 of 4 REV 09/21 * Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and County of San Diego; Habitat Management Plan; and any other equivalent environmentally sensitive areas which have been identified by the City. STEP 3 TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1)): YES NO 1. Is your project a new development that creates 10,000 square feet or more of impervious surfaces collectively over the entire project site? This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. 2. Is your project a redevelopment project creating and/or replacing 5,000 square feet or more of impervious surface collectively over the entire project site on an existing site of 10,000 square feet or more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. 3. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a restaurant? A restaurant is a facility that sells prepared foods and drinks for consumption, including stationary lunch counters and refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial Classification (SIC) code 5812). 4. Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious surface collectively over the entire project site and supports a hillside development project? A hillside development project includes development on any natural slope that is twenty-five percent or greater. 5. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a parking lot? A parking lot is a land area or facility for the temporary parking or storage of motor vehicles used personally for business or for commerce. 6. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious street, road, highway, freeway or driveway surface collectively over the entire project site? A street, road, highway, freeway or driveway is any paved impervious surface used for the transportation of automobiles, trucks, motorcycles, and other vehicles. 7. Is your project a new or redevelopment project that creates and/or replaces 2,500 square feet or more of impervious surface collectively over the entire site, and discharges directly to an Environmentally Sensitive Area (ESA)? “Discharging Directly to” includes flow that is conveyed overland a distance of 200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an isolated flow from the project to the ESA (i.e. not commingled with flows from adjacent lands).* 8. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface that supports an automotive repair shop? An automotive repair shop is a facility that is categorized in any one of the following Standard Industrial Classification (SIC) codes: 5013, 5014, 5541, 7532-7534, or 7536-7539. 9. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious area that supports a retail gasoline outlet (RGO)? This category includes RGO’s that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily Traffic (ADT) of 100 or more vehicles per day. 10. Is your project a new or redevelopment project that results in the disturbance of one or more acres of land and are expected to generate pollutants post construction? 11. Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of impervious surface or (2) increases impervious surface on the property by more than 10%? (CMC 21.203.040) If you answered “yes” to one or more of the above questions, your project is a PDP. If your project is a redevelopment project, go to step 4. If your project is a new project, go to step 6, check the first box stating, “My project is a PDP …” and complete applicant information. If you answered “no” to all of the above questions, your project is a ‘STANDARD PROJECT’. Go to step 5, complete the trash capture questions.. E-34 Page 4 of 4 REV 09/21 STEP 4 TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP) ONLY Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3.b.(2)): YES NO Does the redevelopment project result in the creation or replacement of impervious surface in an amount of less than 50% of the surface area of the previously existing development? Complete the percent impervious calculation below: Existing impervious area (A) = sq. ft. Total proposed newly created or replaced impervious area (B) = sq. ft. Percent impervious area created or replaced (B/A)*100 = % If you answered “yes”, the structural BMPs required for PDP apply only to the creation or replacement of impervious surface and not the entire development. Go to step 6, check the first box stating, “My project is a PDP …” and complete applicant information. If you answered “no,” the structural BMP’s required for PDP apply to the entire development. Go to step 6, check the first box stating, “My project is a PDP …” and complete applicant information. STEP 5 TO BE COMPLETED FOR STANDARD PROJECTS Complete the question below regarding your Standard Project (SDRWQCB Order No. 2017-0077): YES NO Is the Standard Project within any of the following Priority Land Use (PLU) categories? R-23 (15-23 du/ac), R-30 (23-30 du/ac), PI (Planned Industrial), CF (Community Facilities), GC (General Commercial), L (Local Shopping Center), R (Regional Commercial), V-B (Village-Barrio), VC (Visitor Commercial), O (Office), VC/OS (Visitor Commercial/Open Space), PI/O (Planned Industrial/Office), or Public Transportation Station If you answered “yes”, the ‘STANDARD PROJECT’ is subject to TRASH CAPTURE REQUIREMENTS. Go to step 6, check the third box stating, “My project is a ‘STANDARD PROJECT’ subject to TRASH CAPTURE REQUIREMENTS …” and complete applicant information. If you answered “no”, your project is a ‘STANDARD PROJECT’. Go to step 6, check the second box stating, “My project is a ‘STANDARD PROJECT’…” and complete applicant information. STEP 6 CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION My project is a PDP and must comply with PDP stormwater requirements of the BMP Manual. I understand I must prepare a Storm Water Quality Management Plan (SWQMP) per E-35 template for submittal at time of application. My project is a ‘STANDARD PROJECT’ OR EXEMPT from PDP and must only comply with ‘STANDARD PROJECT’ stormwater requirements of the BMP Manual. As part of these requirements, I will submit a “Standard Project Requirement Checklist Form E-36” and incorporate low impact development strategies throughout my project. My project is a ‘STANDARD PROJECT’ subject to TRASH CAPTURE REQUIREMENTS and must comply with TRASH CAPTURE REQUIREMENTS of the BMP Manual. I understand I must prepare a TRASH CAPTURE Storm Water Quality Management Plan (SWQMP) per E-35A template for submittal at time of application. Note: For projects that are close to meeting the PDP threshold, staff may require detailed impervious area calculations and exhibits to verify if ‘STANDARD PROJECT’ stormwater requirements apply. My project is NOT a ‘development project’ and is not subject to the requirements of the BMP Manual. Applicant Information and Signature Box Applicant Name: Applicant Title: Applicant Signature: Date: SITE INFORMATION CHECKLIST Project Summary Information Project Name Garfield Homes Project ID MS 2021-001 Project Address 4008 Garfield Homes Carlsbad, CA 92008 Assessor's Parcel Number(s) (APN(s)) 206-080-01-00 Project Watershed (Hydrologic Unit) Carlsbad 904 Parcel Area 0.253 Acres ( 11,003 Square Feet) Description of Existing Site Condition and Drainage Patterns Select applicable Land Use Category: High Density Residential  R-23 (15-23 du/ac)  R-30 (23-30 du/ac) Industrial  PI (Planned Industrial) Commercial  CF (Community Facilities)  GC (General Commercial)  L (Local Shopping Center)  R (Regional Commercial)  V-B (Village-Barrio)  VC (Visitor Commercial)  O (Office)  VC/OS (Visitor Commercial/Open Space) Mixed Urban  PI/O (Planned Industrial/Office)  Public Transportation Stations Description / Additional Information: Description of Existing Site Topography and Drainage [How is storm water runoff conveyed from the site? At a minimum, this description should answer (1) whether existing drainage conveyance is natural or urban; (2) describe existing constructed storm water conveyance systems, if applicable; and (3) is runoff from offsite conveyed through the site? if so, describe]: The existing site can be categorized into one major drainage basin, with one primary discharge location onto Chinquapin Avenue by surface and sheet flow methods. Once on Chinquapin Avenue runoff from the site travels east until the runoff enters an existing storm drain inlet at the end of the public street approximately 0.1 miles from the site. Runoff continues in the public storm water facilities until ultimately reaching the Pacific Ocean. Description of Proposed Site Development and Drainage Patterns Project Description / Proposed Land Use and/or Activities: The project scope includes the demolition of all existing onsite improvements and the construction of four new condominium units. The construction of the new condominiums will include site grading, as well as drainage and utility improvements typical to this type of multi- family residential development. Does the project include grading and changes to site topography? Yes No Description / Additional Information: Project proposes to precise grade the site along with some changes to onsite topography the onsite grading consists of approximately 90 CY of cut and 210 CY of fill, resulting in 120 CY of import. Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? Yes No Description / Additional Information: The proposed drainage system has area drains through out the site and pipes runoff to 2 sidewalk underdrains that discharge runoff on Chinquapin Avenue. Once discharging off the site runoff continues to drain east down Chinquapin Avenue similar to predevelopment conditions. Optional Additional Information or Continuation of Previous Sections As Needed This space provided for additional information or continuation of information from previous sections as needed. E-36 Page 1 of 3 Revised 09/21 Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov STANDARD PROJECT REQUIREMENT CHECKLIST E-36 Project Information Project Name: Project ID: DWG No. or Building Permit No.: Baseline BMPs for Existing and Proposed Site Features Complete the Table 1 - Site Design Requirement to document existing and proposed site features and the BMPs to be implemented for them. All BMPs must be implemented where applicable and feasible. Applicability is generally assumed if a feature exists or is proposed. BMPs must be implemented for site design features where feasible. Leaving the box for a BMP unchecked means it will not be implemented (either partially or fully) either because it is inapplicable or infeasible. Explanations must be provided in the area below. The table provides specific instructions on when explanations are required. Table 1 - Site Design Requirement A. Existing Natural Site Features (see Fact Sheet BL-1) 1. Check the boxes below for each existing feature on the site. 1. Select the BMPs to be implemented for each identified feature. Explain why any BMP not selected is infeasible in the area below. SD-G Conserve natural features SD-H Provide buffers around waterbodies Natural waterbodies Natural storage reservoirs & drainage corridors -- Natural areas, soils, & vegetation (incl. trees) -- B. BMPs for Common Impervious Outdoor Site Features (see Fact Sheet BL-2) 1. Check the boxes below for each proposed feature. 2. Select the BMPs to be implemented for each proposed feature. If neither BMP SD-B nor SD-I is selected for a feature, explain why both BMPs are infeasible in the area below. SD-B Direct runoff to pervious areas SD-I Construct surfaces from permeable materials Minimize size of impervious areas Streets and roads Check this box to confirm that all impervious areas on the site will be minimized where feasible. If this box is not checked, identify the surfaces that cannot be minimized in area below, and explain why it is infeasible to do so. Sidewalks & walkways Parking areas & lots Driveways Patios, decks, & courtyards Hardcourt recreation areas Other: _______________ C. BMPs for Rooftop Areas: Check this box if rooftop areas are proposed and select at least one BMP below. If no BMPs are selected, explain why they are infeasible in the area below. (see Fact Sheet BL-3) SD-B Direct runoff to pervious areas SD-C Install green roofs SD-E Install rain barrels E-36 Page 2 of 3 Revised 09/21 D. BMPs for Landscaped Areas: Check this box if landscaping is proposed and select the BMP below SD-K Sustainable Landscaping If SD-K is not selected, explain why it is infeasible in the area below. (see Fact Sheet BL-4) Provide discussion/justification for site design BMPs that will not be implemented (either partially or fully): Baseline BMPs for Pollutant-generating Sources All development projects must complete Table 2 - Source Control Requirement to identify applicable requirements for documenting pollutant-generating sources/ features and source control BMPs. BMPs must be implemented for source control features where feasible. Leaving the box for a BMP unchecked means it will not be implemented (either partially or fully) either because it is inapplicable or infeasible. Explanations must be provided in the area below. The table provides specific instructions on when explanations are required. Table 2 - Source Control Requirement A. Management of Storm Water Discharges 1. Identify all proposed outdoor work areas below Check here if none are proposed 2. Which BMPs will be used to prevent materials from contacting rainfall or runoff? (See Fact Sheet BL-5) Select all feasible BMPs for each work area 3. Where will runoff from the work area be routed? (See Fact Sheet BL-6) Select one or more option for each work area SC-A Overhead covering SC-B Separation flows from adjacent areas SC-C Wind protection SC-D Sanitary sewer SC-E Containment system Other Trash & Refuse Storage Materials & Equipment Storage Loading & Unloading Fueling Maintenance & Repair Vehicle & Equipment Cleaning Other: _________________ B. Management of Storm Water Discharges (see Fact Sheet BL-7) Select one option for each feature below: • Storm drain inlets and catch basins … are not proposed will be labeled with stenciling or signage to discourage dumping (SC-F) • Interior work surfaces, floor drains & sumps … are not proposed will not discharge directly or indirectly to the MS4 or receiving waters • Drain lines (e.g. air conditioning, boiler, etc.) … are not proposed will not discharge directly or indirectly to the MS4 or receiving waters • Fire sprinkler test water … are not proposed will not discharge directly or indirectly to the MS4 or receiving waters Provide discussion/justification for source control BMPs that will not be implemented (either partially or fully): SUMMARY OF TRASH CAPTURE BMPS Trash Capture BMPs All projects subject to trash capture requirements must implement trash capture BMPs (see Chapter 4 of the BMP Design Manual). Selection of trash capture BMPs must be based on the selection process described in Chapter 4. Trash capture BMPs must be verified by the City at the completion of construction. This may include requiring the project owner or project owner's representative to certify construction of the trash capture BMPs (see Section 1.12 of the BMP Design Manual). Trash capture BMPs must be maintained into perpetuity, and the City must confirm the maintenance (see Section 7 of the BMP Design Manual). Use this form to provide narrative description of the general strategy for trash capture BMP implementation at the project site in the box below. Then complete the trash capture BMP summary information sheet for each trash capture BMP within the project (copy the BMP summary information page as many times as needed to provide summary information for each trash capture BMP). Describe the general strategy for trash capture BMP implementation at the site. This information must describe how the steps for selecting and designing trash capture BMPs presented in Section 4.4 of the BMP Design Manual were followed, and the results (type of BMPs selected). There are four grated inlets around the site to collected stormwater runoff prior to discharge onto Chinquapin Avenue. The trash capture BMPs were selected using the rational method to determine the flowrate to each grate inlet and CASQA’s list of approved trash capture BMPs. DMAs were created for each grate inlet, runoff coefficients were calculated from a weighted average of the impervious and pervious areas of the site, and the rainfall intensity was taken from Appendix J of the BMP design manual. The rational method calculations are included in attachment 1c. After calculating the flow rate, the Stormtek pipe screen connector and Frog Creek Partner’s TTC Mundus Bag were selected based on its treatment flow rate being higher than then the flowrate each grate inlet will receive. Stormtek’s pipe screen connector and Frog Creek Partner’s TTC Mundus Bag have apertures less than 5mm ensuring capture of all particles 5mm in size or larger. Two out of the four DMA’s will use Stormtek Pipe Screen Connector ST3 / ST3G model with a treatment flow of 5.86 cfs. DMA 1 will have a flow of 0.015 cfs reaching the pipe connector screen. DMA 4 will have a flow of 0.018 cfs reaching the pipe connector screen. DMA’s 3 and 4 will use Frog Creek TTC Mundus Bags and will have a flow of 0.008 and 0.002 cfs reaching them respectively. [Continue on next page as necessary.] [Continued from previous page – This page is reserved for continuation of description of general strategy for trash capture BMP implementation at the site.] Trash Capture BMP Summary Information BMP ID No. Type of Trash Capture BMP Permit No. Drawing No. 1 Stormtek Pipe Screen Connector ST3 / ST3G Flowrate: 5.86 cfs GR 2021-35 533-6A 2 Frog Creek Partners Channel Filter TTC GR 2021-35 533-6A 3 Frog Creek Partners Gutter Bin Filter TTC GR 2021-35 533-6A 4 Stormtek Pipe Screen Connector ST3 / ST3G Flowrate: 5.86 cfs GR 2021-35 533-6A 1.C) Trash Capture BMP Design Calculations Q = CIA *Rational Method Equation I = 0.471 in/hr *BMP design manual rainfall intensity for 1-hr 1-yr storm Total Area = 6,001 sf ➔ 0.138 Acres Impervious Area = 4,205 sf ➔ 0.097 Acres Pervious Area = 1,796 sf ➔ 0.041 Acres Cn, Weighted Runoff Coefficient - 0.25, Cn value for natural ground, Type B soils * Per San Diego Hydrology Design Manual (SDHDM) Section 3.1.2 - 0.9, C value for developed / impervious surface * Per SDHDM Section 3.1.2 Cn = 0.9 x 4,205 sf + 0.25 x 1,796 sf = 0.71 6,001 sf DMA 1 Total Area = 0.058 Acres Q1 = 0.71 * 0.471 in/hr * 0.045 Acres = 0.015 cfs DMA 2 Total Area = 0.006 Acres Q1 = 0.71 * 0.471 in/hr * 0.023 Acres = 0.008 cfs DMA 3 Total Area = 0.029 Acres Q1 = 0.71 * 0.471 in/hr * 0.005 Acres = 0.002 cfs DMA 4 Total Area = 0.023 Acres Q1 = 0.71 * 0.471 in/hr * 0.055 Acres = 0.018 cfs 1. Cover Letter a. Product Name and General Description of Device The Stormtek ST3 & ST3G is a Connector Pipe Screen filter used specifically for catch basin or curb inletsumps and installed in front of the outflow pipe at the bottom of the sump.The Stormtek device provides physical screening of pollutants such as solids, trash and debris. It is best used in central drains from paved surface areas in both arterial and non arterial along with commercial and residential areas. b. Applicant's Contact Information and Location Chief Executive Officer: Keith Morgan Storm Water Inspection & Maintenance Services, Inc Chief Financial Officer and Office Manager keith@swimsclean.com (925) 783-9092 Vice President: Todd Hudson Storm Water Inspection & Maintenance Services, Inc Vice President of Operations todd@swimsclean.com (925) 570-4575 Authorized Representative: Ric Campos Storm Water Inspection & Maintenance Services, Inc President and Owner ric@swimsclean.com (510) 773-5461 Mailing Address: Storm Water Inspection & Maintenance Services, Inc c/o Ric Campos PO Box 1627 Discovery Bay, CA 94505 c. Manufacturer's Website for Device https://swimsclean.com/stormtek/ i d. Manufacturing Location for Device Manufacturer Name: Storm Water Inspection & Maintenance Services, Inc Manufacturer Address: 698 Enterprise Court Livermore, CA 94550 Manufacturer Phone: (925) 516-8966 Manufacturer Representative: Ethan Purkey (925) 698-5417 e. Summary of Field/Lab Testing Results All solids, trash and debris for any storm event is captured with the Stormtek device with it's full trash capture 5mm mesh screen. No lab testing has been recorded for the Stormtek ST3 or ST3G device. f. Summary of Device Limitations, and Operational, Sizing and Maintenance Considerations Each Stormtek unit is specifically designed for a specific catch basin or outflow pipe. We wake all elements into consideration for the design and build, which is for the benefit of both catching contaminants and utilizing the space for best possible flow rates. Our durable frame is mounted to the outflow pipe wall and is equipped with pins that will hold the device in place and can be easily removed for maintenance and vector control. The STORMTEK device is made with a high grade steel (S-304) and a 5mm mesh screen. Our welded mesh screen and framing throughout makes our device able to withstand the toughest of conditions and with a track record of doing just that. Please refer to our website www.swimsclean.com/stormtek to see a list of cities that have trusted the STORMTEK device. Maintenance on the Stormtek unit is imperative for the function and durability of the device. The schedule of maintenance should be Two (2) Times Per Year (once in the dry season and once in the wet season) unless additional services are required in high traffic areas. The two cleanings are required to ensure correct trash capture and bypass does not occur. g. Description, or List of Locations, where Device has been installed The Stormtek device has been installed throughout California and nationally to meet various trash capture projects and applications. See list below with a few examples of installation areas: Example of Installations Project Location Contact City of San Jose City of Milpitas Apple Spaceship Campus Various streets in city Great Mall Pkwy, Milpitas Blvd 10955 N Tantau Ave, Cupertino, CA 95014 Theresa Porter Julie Waldron Preston Pipelines ii h. Certification I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my injury of the person(s) that manage the system or those persons directly responsible for gathering the information, to the best of my knowledge and belief, the information submitted is, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. 7/14/2021 Ric Campos Date Storm Water Inspection & Maintenance, Inc President/Owner ric@swimsclean.com (510) 773-5461 iii Table of Contents 1. Cover Letter a. Product Name and General Description of Device...........................................i b. Applicant's Contact Information and Location...................................................i c. Manufacturer's Website for Device....................................................................i d. Manufacturing Location for Device...................................................................ii e. Summary of Field/Lab Testing Results.............................................................ii f. Summary of Device Limitations, and Operational, Sizing, and Maintenance Considerations...................................................................................................ii g. Description, or List of Locations, where Device has been installed..................ii h. Certification......................................................................................................iii 2. Table of Contents............................................................................................1-2 3. Physical Description..........................................................................................3 a. Trash Capture: Description of Device..............................................................3 b. Peak Flows/Trash Volumes.............................................................................4 c. Hydraulic Capacity...........................................................................................4 1) Hydraulic Capacity Table.............................................................................4 2) Alternative Configuration Hydraulic Capacity Table.....................................4 3) Hydraulic Capacity Calculations or Field Test Results.................................4 d. Comparison Table............................................................................................4 e. Design Drawings..............................................................................................5 f. Alternative Configurations.................................................................................5 g. Internal Bypass................................................................................................5 h. Previously Trapped Trash................................................................................5 i. Calibration Feature............................................................................................5 j. Photos...............................................................................................................6 k. Material Type...................................................................................................7 l. Design Life........................................................................................................7 1 4. Installation Guidance........................................................................................8 a. Installation Procedures....................................................................................8 b. Device Installation Limitations/Non-standard Installation Procedures.............8 c. Diagnosing and Correcting Installation Errors.................................................8 5. Operation and Maintenance Information.........................................................9 a. Device Inspection Procedures and Frequency Considerations........................9 b. Device Maintenance Frequency Related to Hydraulic Capacity.......................9 c. Maintenance Procedures..................................................................................9 d. Maintenance Equipment and Materials..........................................................10 e. Effects of Deferred Maintenance....................................................................10 f. Repair Procedures...........................................................................................10 6. Vector Control Accessibility...........................................................................11 a. Date of Submittal to Mosquito Vector Control Association.............................11 b. Description of Access for Vector Control Personnel.......................................11 c. Letter of Verification from Mosquito Vector Control Association.....................11 7. Reliability Information.....................................................................................12 a. Estimated Design Life.....................................................................................12 b. Warranty Information......................................................................................12 c. Customer Support Information........................................................................12 8. Field/Lab Testing Information & Analysis.....................................................13 a. Available Field/Lab Testing Information - Devices with 5mm Screen.............13 b. Available Field/Lab Testing Information - Devices without 5mm Screen........13 APPENDIX A.........................................................................................................14 Stormtek Design Drawing...................................................................................15 APPENDIX B.........................................................................................................16 MVCAC Approval Document..............................................................................17 2 Section 1. Physical Description DESCRIPTION OF DESIGN ELEMENTS • The mounting frame can be made of coated or stainless steel. Frame members are made from 2” flat bars with a minimum thickness of 3/16 inch. • The insert screen is made of heavy-gage sheet metal with 5 millimeter (mm) openings. Total openings constitute 50% of the screen surface. Top 4 inches of the screen is grated with bars spaced at 2 inches on center. • Insert top cover is made of heavy-gage sheet metal screen with 5 mm openings and 1” support frames. • Structural support members for the screen and top cover are made of coated or stainless steel. Members are made from 1” flat bars with a minimum thickness of 1/8 inch. • Mounting frame members are welded • Structural support frame members are welded • Insert screens are welded onto structural support frames. • Mounting frames are bolted onto the catch basin wall at the outlet opening. Mounting frames are to be anchored at all four corners with HILTI expansion anchors or equal. • Inserts are installed vertically onto the mounting frame directly in front of the outlet opening. •The insert is completely removable by lifting it off the mounting frame a. Trash Capture: Description of Device Internal Bypass: The bypass can range anywhere between 6-8 inches of an opening near the top of the device for heavy flow rates. Once the flow reaches the bypass it can flow freely into bypass. 3. Physical Desription 3 b. Peak Flows / Trash Volumes The tables in Section 3 Hydraulic Capacities list Peak Flow and Trash (Storage) Volume capacities for 4 common sizes of the Stormtek ST3 & ST3G devices. c. Hydraulic Capacity 1) Hydraulic Capacity Table 2) Alternative Configuration Hydraulic Capacity Table Stormtek does not have alternative configurations 3) Hydraulic Capacity Calculations or Field Test Results See Table Above d. Comparison Table The tables in table above lists storage and hydraulic capacities for 4 common sizes of the Stormtek device Stormtek ST3 & ST3G Connector Pipe Screen Hydraulic Capacity Filtered Flow (CFS)Stormtek device size 24 x 24 x 12r 24 x 36 12r Peak/ Bypass Flow (CFS) Storage Capacity (CF) 24 x 18 x 12r 24 x 30 x 12r 5.86 3.81 Empty 25% Full 50% Full 75% Full 2.07 .73 10.29 .95 9.02 5.86 3.19 1.13 10.59 1.27 12.61 8.19 4.46 1.58 10.59 1.58 16.57 10.76 5.86 2.07 10.59 1.90 4 e. Design Drawings Design drawings for Stormtek are included in Appendix A f. Alernative Configurations Stormtek does not have alternative configurations g. Internal Bypass The bypass on the Stormtek device is designed for the occasion when full capacity of the sump surrounding the device has occurred. The bypass is located on the upper area of the device right below the deflector plate. This bypass is equal to the flow rate based on the size of the outflow pipe. Note: Bypass should not occur when the device is properly maintained and on a regular maintenance schedule. h. Previously Trapped Trash The Stormtek device is designed with a semi circle shape to provide more of a storage area for trapped trash and helps roll trash to sides. This helps give more room for storing previously trapped trash. This trash only discharges downstream when there is no regular maintenance and the storage height has reached the bypass area. i. Calibration Feature Stormtek does not have a calibration feature 5 j. Photos Figure 1. Installed Stormtek device Figure 2. Installed Stormtek device Figure 3. Installed Stormtek device Figure 4. Installed Stormtek device Figure 6. Installed Stormtek device in shallow sump 6 k. Material Type The Stormtek device is made of all stainless steel 304 metal. The mounting frame are made of 2" flat bars with a minimum thckness of 3/16 inch. The insert screen is made of heavy gage sheet metal with less than 5mm openings. The top openings of 4" of the screen is grated with bars spaced 2" on center. The top cover is made of the same material as the insert screen. The structural support members for the screen is made of stainless steel and are made from 1" flat bars with a minimum thickness of 1/8". l. Design Life The design life for the Stormtek device is 15 years. This is dependent on being correctly installed along with the recommended maintenance of at least (2x) per year or more depending on surrounding conditions. 7 6 4. Installation Guidance a. Installation Procedures b. Device Installation Limitations/ Non-standard Installation Procedures Although the STORMTEK device is manufactured to the specification of the catch basin/vault, occasionally the CB sump is too shallow to be practical. In this case we recommend relocating the device to an alternate CB. In the event of a non-standard installation procedure the installer can contact STORMTEK customer service at (925) 516-8966. Ask for Ethan or Todd c. Diagnosing and Correcting Installation Errors STORMTEK has been designed for simple installation and maintenance. After installation, visually inspect frame for contact with CB/vault wall. Install and remove STORMTEK screen from locator pins on frame for easy removal for maintenance. If there a problem exists, please review all steps in the above installation procedure. In the event of a problematic installation procedure the installer can contact STORMTEK customer service at (925) 516-8966. Ask for Ethan or Todd 8 a. Installation Procedures STORMTEK is custom manufactured to fit each specific installation. Proper measurement is required prior to ordering the device. It is recommended that the catch basins are cleaned and inspected for any damage or irregularities prior to installing the STORMTEK device. If the installation surfaces on the catch basin/vault walls are irregular or damaged, some modifications may be needed to create a smooth mounting surface. 1. Set up all safety requirements prior to starting installation. 2. Remove the manhole cover or grate. 3. Clean CB/vault surfaces. 4. Center STORMTEK frame over effluent pipe. 5. Attach to CB/vault wall with expansion anchors. 6. The STORMTEK screen is placed on the frame locator pins and slide down to secure in place. 7. Reinstall manhole cover or grate. b. Device Installation Limitations / Non-standard Installtion Procedures Although the Stormtek device is manufactured to the specification of the catch basin/vault, occasionally the CB sump is too shallow to be practical. In this case we recommend relocation the device to an alternate CB. In the event of non-standard installation procedure the installer can contact Stormtek customer service at (925) 516-8966. Ask for Ethan or Todd. c. Diagnosing and Correcting Installation Errors Stormtek has been designed for simple installation and maintenance. After installation, visually inspect frame for contact with CB/vault wall. Install and remove Stormtek screen from locater pins on frame for easy removal for maintenance. If there a problem exists, please review all steps in the above installation procedure. In the event of a problematic installation procedure the installer can contact Stormtek customer service at (925) 516-8966. Ask for Ethan or Todd. 4. Installation Guidance 7 5. Operation and Maintenance Information a. Inspection Procedures and Frequency Considerations Inspection and Maintenance intervals will depend on many factors such as location, size/quantity, storm water runoff volume, surrounding vegetation and debris potential. The following is the minimum inspection recommendation, but inspection and maintenance may need interval increases, as necessary. STORMTEK recommends two inspection per year minimum. The first inspection should take place at the start of the rainy season and the second inspection taking place near the end of the rainy season. ** Inspections in the first year of installation should be more frequent, 3-4 times per year, to establish a base line for debris loading. ** If the region of installation has no definitive rainy season, inspections should be spaced evenly throughout the year. STORMTEK Connector Pipe Screens can be inspected without entry into the catch basin. Follow all safety precautions, traffic control and PPE requirement for the specific work area. SAFETY FIRST 1. Remove the manhole cover or grate. 2. Inspect the interior catch basin opening, walls and floor. 3. Inspect the STORMTEK connector pipe screen for damage or looseness. 4. Inspect vector control deflector plate for proper operation (if applicable) 5. Measure debris load with sludge judge, tape measure or equal. 6. Note findings and take photos as necessary. 7. Note if any vector problems. 8. Replace the manhole cover or grate. b. Device Maintenance Frequency Related to Hydraulic Capacity Periodic maintenance is required to ensure proper function of the STORMTEK Connector Pipe Screen and to ensure continued protection of the receiving water bodies. A maintenance program should be based on the data from the previous inspection history as well the size and location of the STORMTEK device. A customized maintenance program provides the most benefit to operation while minimizing maintenance costs. Maintenance should be performed when the STORMTEK device reaches 75% height /volume capacity. c. Maintenance Procedures Follow all safety precautions, traffic control and PPE requirement for the specific work area. SAFETY FIRST. STORMTEK recommends the following maintenance procedures: 5. Operation and Maintenance Information a. Device Inspection Procedures and Frequency Considerations b. Device Maintenance Frequency Related to Hydraulic Capacity c. Maintenance Procedures 9 8 1. The manhole cover or grate shall be removed and set to one side. 2. The catch basin shall be visually inspected for defects and possible illegal dumping. If illegal dumping has occurred, the proper authorities and property owner representative shall be notified as soon as practicable. 3. Using an industrial vacuum, the collected debris/materials shall be removed from the catch basin/vault. 4. When all collected debris/materials have been vacuumed, the STORMTEK device can be easily removed by lifting the screen off of the locator pins. The STORMTEK screen can now be inspected and cleaned. 5. Reinstall the screen on to the locator pins and secure in place. 6. The manhole cover or grate shall be reinstalled. 7. All removed debris shall be disposed of in accordance with local, state, and federal agency requirements. d. Maintenance Equipment and Materials The following equipment should be used to conduct maintenance on the STORMTEK connector pipe screen. • Personal Protective Equipment (PPE), Safety equipment and traffic control as needed. • Lighting as needed • Industrial vacuum • Pressure washer (recmended) • Tools for safe removal/reinstallation of manhole or grate. e. Effects of Deferred Maintenance Deferred maintenance may allow the STORMTEK device to achieve capacity and go into bypass. Once the system is in bypass, no additional trash or debris will be collected. If bypass occurs, the debris in the bypass flows will pass through the system and discharge in receiving waters. f. Repair Procedures If inspection of the STORMTEK device reveals damage and is in need of repair, the damage should be documented, photographed, and then submitted to STORMTEK (SWIMS) for assessment. STORMTEK personnel will evaluate the damage and recommend or initiate any warranty repair. Responsibility for the repair will depend on the cause of damage. d. Maintenance Equipment and Materials e. Effects of Deferred Maintenance f. Repair Procedures 10 Section 4. Mosquito and Vector Control The StormTek ST3G device has a hinged deflector plate that can lift-up for mosquito or vector inspection, access, or treatment. This deflector plate can be lifted through the storm grate with a simple hook tool or equal. The deflector plate is light weight and easy to lift and return into position. The lid and hinges are made from stainless steel and therefore will not rust. Application for the Mosquito and Vector Control Association of California approval of the Stormtek device was submitted on February 3rd of 2021. 6. Vector Control Accesibility a. Date of Submittal to Mosquito Vector Control Association The Application for the Mosquito and Vector Control Association of California approval of the Stormtek Device was submitted on August 4th of 2021. b. Description of Access for Vector Control Personnel a. Date of Submittal to Mosquito Vector Control Assocation c. Letter of Verification from Mosquito Vector Control Association Refer to Appendix B for letter of verification from MVCAC 11 10 7. Reliability Information a. Estimated Design Life The estimated design life for the STORMTEK Connector Pipe Screen is 15 years. Design life estimate is dependent on the proper design, installation and maintenance of the system and assume no extraordinary circumstances. b. Warranty Information STORMTEK warranties the ST3 and ST3G models to be free from manufacturing defects for a period of one (5) year from the date of purchase. Abusive treatment, lack of routine maintenance, neglect or improper use of the will not be covered by this warranty. c. Customer Support Information STORMTEK (and SWIMS) offers full customer service and support for all STORMTEK products. Customer Support contact information: STORMTEK and Storm Water Inspection and Maintenance Services, Inc. PO Box 1627 Discovery Bay, CA 94505 (925) 516-8966 Web site: www.swimsclean.com E-mail: info@swimsclean.com 7. Reliability Information a. Estimated Design Life b. Warranty Information c. Customer Support Information 12 11 8. Field/Lab Testing Information and Analysis a. Available Field/Lab Testing Information – Devices with 5mm Screen STORMTEK includes a screen with 4.9mm apertures through which all treatment flow must pass to travel downstream; therefore, testing is not required to demonstrate trash capture performance because particles 5mm in diameter and larger cannot physically pass through the screen. b. Available Field/Lab Testing Information – Devices without 5mm Screen STORMTEK without the trash capture (4.9mm aperture) screen do not have testing or field data available and will not be used for trash capture applications. 8. Field/Lab Testing Information and Analysis a. Available Field/Lab Testing Information - Devices with 5mm Screen b. Available Field/Lab Testing Information - Devices without 5mm Screen 13 APPENDIX A APPENDIX A 14 Catch Basin SumpStormTek™ ST3/ST3GDeflector Plate onlywith ST3G ModelStainless Steel Frame(2" flat bars, 3/16" thick)mounted to wallDevice fastens on pinsOutflow PipeHeavy-Gage Sheet Metal ScreenS-304 Stainless Steel5mm openingsStructural Support Bars(Bypass)Stainless Steel1" flat bars1/8" thickness- Bypass has equivalent or greater flow rate as outflow pipe10/25/2018P.O. Box 1627Discovery Bay, CA 94505StormTeka) StormTek™ ST3/ST3Gb) StormTek™ is installed in front of theoutflow pipe is supported by the framemounted on the existing catch basin wallc) This device is designed to capturetrash, sediment and debris from enteringthe storm water system.StormTek™ ST3/ST3G Installation: Connector Pipe Screen FilterP.O. Box 1627Discovery Bay, CA 94505NorCal: 925.516.8966SoCal: 949.542.7234www.swimsclean.comGeneral Notes:Revision/IssueCompany Name and Address:Product Name and Address:Scale:ScaleStormTek™ Pipe ScreenModel ST3/ST3GProject:No.1- Device is retro-fitted to catch basin specifications- Deflector plate is the only difference between ST3 & ST3GStormTek™No ScaleSheet:1 of 1Plan ViewSection A15 Mundus Bag® water filter Gutter Bin® stormwater filtration system Product Specifications ●Removeable, replaceable and customizable filtration capabilities ●Adjustable backflow preventer ●Variable depth for deep or shallow catch basins ●Heavy duty construction for extended field life ●Single use and reusable models available ●Able to weigh bag for measurable & quantifiable results The patented Mundus Bag water filter removes a broad spectrum of trash, microplastics, sediment, heavy metals and hydrocarbons from stormwater. It fully integrates with the complete line of Gutter Bin stormwater filtration systems. Copyright © 2020 Frog Creek Partners, LLC. All Rights Reserved. - The Gutter Bin® stormwater filtration system and the Mundus Bag® water filter are patented (US 10,724,224) and patent pending - Oct20 CERTIFIED: Full Trash Capture Vector Control Accessible 100% Total Trash Capture - TTC trash & debris > 4.0 mm High strength polypropylene net Trash, Debris & Sediment - TDS TSS capture Geofabric with 0.212 particle size removal capabilities Vacuum Truck Friendly - VTF trash & debris > 0.6 mm Industrial strength polypropylene mesh Sediment, Hydrocarbons, Heavy Metals, & Trash - SHHT MYCELX Performer media, MYCELX Snippets & FCP media ●Cleaned manually or with vacuum truck ●Capable of vertical or sloped applications ●Cylinder-like configuration packs trash ●Evacuate contents from top or bottom ●Sewn in our Casper, WY facility ●Constructed with 95%+ recyclable material Mundus Bag models Chemistry by: Permanently removes oils and hydrocarbons. Removes heavy metals & PFAS. Non-toxic and environmentally safe. Mundus Bag data Useful Conversions 1 CFM = 7.48 GPM = 28.3 L/min 1 gal = 3.79L - 8.34 lbs H2O 1 m2 = 10.76 ft2 1 acre = 43.560 ft2/acre 1 Bar = 14.5 PSI at sea level 1 in = 2.54 cm 1 mile = 1.61 km gutter sand SG = 2.2 Hydraulic capacity of empty bag* Model (MB-)+ Bag dia (in.) Capacity of 4' long bag* (cu.ft) Min/Max length of filter (in) Aperture size - particle retention (mm) Load rating of filter bag (lbs)gpm cfs Maximum Tension Load (lbs)Reusable Approx. Useful Life (months) TTC-9 9 1.77 12/48 4.00 132 1,037 138.6 264 Yes 12-24 TTC-13 13 3.69 12/48 4.00 276 2,153 287.8 264 Yes 12-24 TTC-16 16 5.58 12/48 4.00 418 3,447 460.8 264 Yes 12-24 TDS-9 9 1.77 12/48 0.21 132 1,037 138.6 441 Site Specific 4-12 TDS-13 13 3.69 12/48 0.21 276 1,935 258.7 441 Site Specific 4-12 TDS-16 16 1.40 12/48 0.21 104 2,428 324.6 441 Site Specific 4-12 SHHT-9 9 0.44 24/72 0.10 33 media dependent media dependent N/A Partial 12-24 SHHT-13 13 0.92 24/72 0.10 69 media dependent media dependent N/A Partial 12-24 SHHT-16 16 1.40 24/72 0.10 104 media dependent media dependent N/A Partial 12-24 VTF-9 9 1.77 12/48 0.60 132 1,037 138.6 605 Yes 24-36 VTF-13 13 3.69 12/48 0.60 276 1,935 258.7 605 Yes 24-36 VTF-16 16 5.58 12/48 0.60 418 2,428 324.6 605 Yes 24-36 * Multiply value accordingly for Gutter Bins with multiple Mundus Bag receivers. Note: assumes the Mundus Bag is 4' feet long. Shorter bags can accommodate shallower catch basins. For use in all Gutter Bin stormwater filtration systems Drop Inlet Filter - DIF Curb Inlet Filter - CIF Channel Filter System - CFS 800 West Yellowstone Hwy Casper, Wyoming 82601 USA 307.797.7720 heya@frogcreek.partners https://frogcreek.partners DUNS #: 080457762 | CAGE: 7RLA3 86542