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CT 2021-0005; CHINQUAPIN COAST HOMES; TRASH CAPTURE STORM WATER QUALITY MANAGEMENT PLAN; 2022-05-05
... --.. -... --... .. - .. .. ... - .. .. ... .. .. .. 1111111 .. .. -.. .. ... --.. ... CITY OF CARLSBAD TRASH CAPTURE STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR 330 CHINQUAPIN AVE CDP-2021-0067 ENGINEER OF WORK: PASCO LARET SUITER -----■ & ASSOCIATES BRYAN A. KNAPP RCE NO: 86542 EXP. 03-31-2023 PREPARED FOR: 330 CHINQUAPIN LLC 5315 AVENIDA ENICAS, SUITE 200 CARLSBAD, CA 92008 PREPARED BY: PASCO, LARET, SUITER & ASSOCIATES 1911 SAN DIEGO AVE, SUITE 100 SAN DIEGO, CA 92110 858-259-8212 DATE: DECEMBER 6, 2021 MAY 5, 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 1 a: DMA Exhibit Attachment 1 b: Tabular Summary of DMAs Attachment 1 c: Trash Capture BMP Design Calculations Attachment 2: Trash Capture BMP Maintenance Thresholds and Actions Attachment 3: Single Sheet BMP (SSBMP) Exhibit -.. - -.. -.. -.. ... .. ... .. -... ... -... -... -... -.. -.. -... .. .. ... ... .. ... ... CERTIFICATION PAGE Project Name: 330 CHINQUAPIN AVENUE Project ID: CDP-2021-0067 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, RCE # 86542 EXP 03/31/2023 PASCO, LARET, SUITER & ASSOCIATES Company Date PROJECT VICINITY MAP VICINITY MAP 1' SCALE: NTS N I AGUA HEDIONDA LAGOON ~ ~ C C ~ C C cityof Carlsbad I INSTRUCTIONS: STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov 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: 330 CHINQUAPIN AVENUE APN: 206-020-11-00 ADDRESS: 330 CHINQUAPIN AVENUE The project is (check one): Ix] New Development D Redevelopment The total proposed disturbed area is: 19,247 ft2 ( 0.44 ) acres The total proposed newly created and/or replaced impervious area is: 9,776 ft2 ( 0.22 ) 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 YES NO Date: Project ID: City Concurrence: □ □ By: E-34 Page 1 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: 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)? YES NO □ [X] 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. STEP2 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: 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 uidance? 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? YES NO □ □ [X] □ 00 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 2 of 4 REV 09/21 STEP3 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 )): 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. 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 develo ment ro·ect includes develo ment on an natural slo e that is twent -five ercent or reater. 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 trans ortation of automobiles, trucks, motorc c/es, 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).* 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 YES NO □ IX] □ IX] □ IX] □ IX] □ [K] □ . IX) □ [X] □ [X] □ IX] □ IX] □ IBl 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 ca ture uestions .. • 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. E-34 Page 3 of 4 REV 09/21 STEP4 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 BM P's required for PDP apply to the entire development. Go to step 6, check the first box statin , "M ro·ect is a PDP ... " and com lete a licant information. STEPS 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), Pl (Planned Industrial), CF(Community Facilities), GC (General [X] O Commercial), L (Local Shopping Center), R (Regional Commercial), V-B (Village-Barrio), VC (Visitor Commercial), 0 (Office), VC/OS (Visitor Commercial/Open Space), Pl/O (Planned Industrial/Office), or Public Trans ortation 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 com lete a licant information. STEP& CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION D 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. 0 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. [X] 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. D 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: __________________ _ E-34 Page 4 of 4 REV 09/21 SITE INFORMATION CHECKLIST Project Summary Information Project Name 330 CHINQUAPIN AVENUE Project ID CDP-2021-XXXX Project Address 330 CHINQUAPIN AVENUE CARLSBAD, CA 92008 Assessor's Parcel Number(s) (APN(s)) 206-020-11 -00 Project Watershed (Hydrologic Unit) Carlsbad 904 Parcel Area 0.44 Acres ( 19,247 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 □ Pl {Planned Industrial) Commercial □ CF (Community Facilities) □ GC (General Commercial) □ L (Local Shopping Center) □ R (Regional Commercial) □ V-8 (Village-Barrio) □ VC (Visitor Commercial) □ 0 (Office) □ VC/OS (Visitor Commercial/Open Space) Mixed Urban □ Pl/O (Planned Industrial/Office) D 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 (1) major drainage basin, with one (1) primary discharge location leaving the property. Drainage basin EX-1 consists of the entirety of the project site and primarily drains from the northwest corner of the property to the southeast, discharging to the Chinquapin Avenue right-of-way by surface and sheet flow methods . Once in the Chinquapin Avenue right-of-way, runoff leaving the site travels northeast towards existing storm water infrastructure. An existing sidewalk underdrain is on the north side of Chinquapin Avenue, which conveys runoff into the public right-of-way . Surface flows entering the sidewalk underdrain ultimately are conveyed south to outlet in the Agua Hedionda Lagoon prior to entering the Pacific Ocean. Description of Proposed Site Development and Drainage Patterns Project Description / Proposed Land Use and/or Activities: The proposed project includes the demolition of all existing onsite improvements and the construction of three (3) new multi-family units, creating a total of nine (9) units. The construction of the project will include site grading as well as drainage & utility improvements typical to this type of multi-fam ily residential development. Does the project include grading and changes to site topography? !XI Yes □No Description/ Additional Informati on: Project proposes precise grading within project limits along with changes to onsite topography. The onsite grading consists of approximately 800 CY cut & 50 CY fill, resulting in 750 CY of export. Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? D1J Yes □No Description / Additional Information : Proposed project maintains existing point of discharge. Drainage patterns internal to the site will be changed to match proposed grading. Site will maintain stormwater conveyance via sheet flow. 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. C cityof Carlsbad STANDARD PROJECT REQUIREMENT CHECKLIST E-36 Project lnfonnation Project Name: 330 CHINQUAPIN AVENUE Plan ID: CT 2021-0005 I PUD 2021-0010 Permit No. CDP-2021-0067 DWG No. Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov 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 1. Select the BMPs to be implemented for each identified feature. Explain the site. why any BMP not selected is infeasible in the area below. · SD-G SD-H Conserve natural Provide buffers around waterbodies features □ Natural waterbodies □ □ □ Natural storage reservoirs & drainage corridors □ -- [XI Natural areas, soils, & veqetation (incl. trees) [XI -- B. BMPs for Common Impervious Outdoor Site Features (see Fact Sheet BL-2) 1. Check the boxes below for each 2. Select the BMPs to be implemented for each proposed feature. If neither BMP SD-8 nor proposed feature. SD-I is selected for a feature, explain why both BMPs are infeasible in the area below. SD-B SD-I Minimize size of Direct runoff to pervious Construct surfaces from impervious areas areas permeable materials IX] Streets and roads □ [XI □ Check this box to confirm IX] Sidewalks & walkways IX] □ that all impervious areas on the site will be minimized IX] Parking areas & lots □ [XI where feasible. [XI Driveways [XI □ If this box is not checked, [XI Patios, decks, & courtyards IX] □ identify the surfaces that cannot be minimized in area □ Hardcourt recreation areas □ □ below, and explain why it is □ Other: □ □ infeasible to do so. C. [XI BMPs for Rooftop Areas: Check this box if rooftop areas are proposed and select at least one BMP (see Fact below. Sheet BL-3) If no BMPs are selected, explain why they are infeasible in the area below. [XI 50-B I O 50-C I □ 50-E Direct runoff to pervious areas Install qreen roofs Install rain barrels E-36 Page 1 of 3 Revised 10/21 D. IX] BMPs for Landscaped Areas: Check this box if landscaping is proposed and select the BMP below (see Fact IX] SD-K Sustainable Landscaping Sheet BL-4) If SD-K is not selected, explain why it is infeasible in the area below. 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 2. Which BMPs will be used to prevent 3. Where will runoff from the work areas below materials from contacting rainfall or work area be routed? runoff? IX! Check here if none are proposed (See Fact Sheet BL-5) (See Fact Sheet BL-6) Select all feasible BMPs for each work area Select one or more option for each . . work area SC-A SC-B SC-C SC-D SC-E Other Overhead Separation Wind Sanitary Containment covering flows from protection sewer system adjacent areas □ Trash & Refuse Storaqe □ □ □ □ □ □ □ Materials & Equipment Storaqe □ □ □ □ □ □ □ Loadinq & Unloadinq □ □ □ □ □ □ □ Fuelinq □ □ □ □ □ □ □ Maintenance & Repair □ □ □ □ □ □ □ Vehicle & Equipment Cleaninq □ □ □ □ □ □ □ Other: □ □ □ □ □ □ B. Management of Storm Water Discharges (see Fact Sheet BL-7) Select one ootion for each feature below: • Storm drain inlets and catch basins ... IX] are not proposed □ will be labeled with stenciling or signage to discouraoe dumoino (SC-F) • Interior work surfaces, floor drains & IX] are not proposed □ will not discharge directly or indirectly to the MS4 sumps ... or receiving waters • Drain lines (e.g. air conditioning, boiler, IX! are not proposed □ will not discharge directly or indirectly to the MS4 etc.) ... or receiving waters • Fire sprinkler test water ... IX! are not proposed □ will not discharge directly or indirectly to the MS4 or receivinq waters Provide discussion/justification for source control BMPs that will not be implemented (either partially or fully): E-36 Page 2 of 3 Revised 10/21 Fonn Certification This E-36 Form is intended to comply with applicable requirements of the city's BMP Design Manual. I certify that it has been completed to the best of my ability and accurately reflects the project being proposed and the applicable BMPs proposed to minimize the potentially negative impacts of this project's land development activities on water quality. I understand and acknowledge that the review of this form by City staff is confined to a review and does not relieve me as the person in charge of overseeing the selection and design of storm water BMPs for this project, of my responsibilities for project design. Preparer Signature: I Date: Print preparer name: E-36 Page 3 of 3 Revised 10/21 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). The trash capture BMP is located at low point of the site, prior to discharge into the public right-of-way. This location provides treatment of the site to the maximum extent feasible. One OMA was created for the inlet with the pipe screen connector inside, 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 1 c. After calculating the flow rate, a oStormtek pipe screen connector for use in grate inlets was selected based on its reatment flow rate being higher than then the flowrate the grate inlet will receive. o Stormtek pipe screen connector for use in grate inlets has an aperture less than 5mm o ensuring capture of all particles 5mm in size or larger. [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.] The trash capture BMP is certified to capture all debris greater than the 5-mm in size and is sized for a 1-hr, 1-yr storm event, minimum . The BMP selected complies with Certified Full Capture System Trash Treatment standards set forth by the California State Water Resources Control Board and the California Stormwater Quality Association (CASQA) . Trash Capture BMP Summary Information BMP ID No. Type of Trash Capture BMP Permit No. Drawing No. 1 Stormtek Connector Pipe Screen CDP-2021-0067 --.... ... - ... .. ... ... ,.. ... ... .... ... ... ... .. - ... ... .... -.... ... ... ... ... ... ... ... ,.. ... Attachment Sequence Attachment 1 a Attachment 1 b Attachment 1 c ATTACHMENT 1 BACKUP FOR TRASH CAPTURE BMPS This is the cover sheet for Attachment 1 . Check which Items are Included behind this cover sheet: Contents Checklist OMA Exhibit (Required) ~ Included See OMA Exhibit Checklist on the back of this Attachment cover sheet. (24"x36" Exhibit typically required) Tabular Summary of DMAs Showing ll Included on OMA Exhibit in OMA ID matching OMA Exhibit, OMA Attachment 1 a Area, and OMA Type (Required)* □ Included as Attachment 1 b, separate from OMA Exhibit *Provide table in this Attachment OR on OMA Exhibit in Attachment 1 a Trash Capture BMP Design ~ Included Worksheets / Calculations (Required) Refer to Appendices J of the BMP Design Manual for trash capture BMP design guidelines -... Ill"" Iii,,, ,.. ... .. ... ... .. ... ... ... Ill"" -... .. ... ... ... ... ... -.... -... ... ... ... ... ,.. ... ... ... Use this checklist to ensure the required information has been included on the DMA Exhibit: The OMA Exhibit must identify: □ Site topography and impervious areas □ Site drainage network and connections to drainage offsite □ Proposed grading (if applicable) □ Drainage management area (OMA) boundaries, OMA ID numbers, and OMA areas (square footage or acreage) □ Trash Capture BMPs (identify location and type of BMP) ~ c C a:' s: ~ ill ::s "' ' ' ' 0.7 / X : , .... --~/ --" I '/ X 52.3 \ / X 52.5 ~ '---6' WOOD cENCE ._,, _,___ ' • , EXISTING 2 STORY au;LDING \ l • , \ , \ __ \. X 5 .4 PR 100 X 3 P\-.... ........._ _5 ~ 51 --SD ! 6' WOOD FENCE LEGEND PROPERTY BOUNDARY CENTERLINE OF ROAD ADJACENT PROPERTY LINE PUBLIC RIGHT-OF-WAY TRASH CAPTURE OMA BOUNDARY IMPERVIOUS AREA EXISTING 1 STORY BUILDING ---------- ~\\\\I \ X434 • • '\x 0.3 ' . 5 . 50.' --,,_ X 0.6 ; 50 --,,_ AvU.v XS .3 '5- DMA-1 (TOTAL) AREA= 19,247 SF (0.442 AC) Cn =058 X .7 ~ ' --,,_ ~ ---- X 52 2 I i X 7 \ 51 '-'--'-----"-____.____._.2----~: , ........ \-............... ~------~ - SD Ill SD SD SD SD ! $• WOO) FENCE I I I I I I I EXISTING 2 STORV BUILDING I I I I I I I I ., EXISTING 2 STORY BUILDING V DE MIN/MIS AREA DRAINING DIREC:r'L Y \ OFFS/TE (240 SF) A 6 1 ---..,_ I I I; w "° _.,.r / I (!) ~ c,l, ~ s I I I s I -~ ~ s s s s L --_,__ ____ ~ __ (48.4) ~'·~ BMP-1. STORMTEK \ CONNECTOR PIPE SCREEN TRASH CAf:,,TURE BMP s s X 0.2 50. I X 51 5 I >< I SD/) , 49. X 5 .4 X 1.2 X 1.4 \ • s X 45.9 X 8.9 ' ' I I • I f 43. SHED . ~, X4 .7 ~ ~ ~ I I I/ I " ~· ' 0 I ,.., ... XI Tl 1 S· RY UI DI G , • I \ l • • , \, • A '::'.~ , "" DE MIN/MIS , , \ \ ,,, .· , 49 I x~ .4 DRAINl~G DIR - OF/iSITE'( i., x, • s s s s s s s s {') s s J s s s s I I N 34"00'09" w -_,..___ -~74~76' -. r, '? P' l;:~OOD FENCE C ! 8' NROUGi-fl7tRONI P' -: -... ¢ :.. I / // /' • -" , FcNe'E TI -_ «· /I 1-" --------------------------'-------------'---~-~~ _.,G,-.~□"~· /7 I_ DMA ID NUMBER 1 EXISTING 2 STORY BUILDING DMA AREA (ACRES) DMA TYPE 0.442AC TRASH CAPTURE 0 I I I I I I I I ~:- \ ~) I I I I • I I I I I , w 0 ·1 w ' ,,o I /. \ v ...u I ' 0 -' - s s (!) s s (!) / s s s s TRASH CAPTURE OMA EX/Hf BT 10 CHINQUAPIN COAST HOMES -330 CHINQUAPIN AVE 30 SCALE: 1" = 10' CARLSBAD, CA 92008 PREPARED BY: PASCO LARET SUITER ~ ~~~©tl~'flE~ San Diego I Solana Beach I Orange County Phone 858.259.8212 I www.plsaengineering.com .. ... ... .. 11111 ---11111 .. 11111 ---11111 .. 11111 1111 11111 --.. 11111 --.. -.. .. ... .. ... .. .. 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= 19,247 sf ■+ 0.442 Acres Impervious Area= 9,776 sf ■+ 0.224 Acres Pervious Area= 9,471 sf ■+ 0.217 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 9,776 sf+ 0.25 x 9,471 sf= 0.580 19,247 sf Basin PR-1 Total Area= 0.442 Acres =CIA =0.580 * 0.471 in/hr* 0.442 Acres = 0.121 cfs -- ------------------.. -- ... -... .. ... .. ... 111111 ... ,. .. ATTACHMENT 2 Trash Capture BMP Maintenance Information Use this checklist to ensure the required information has been included in the Structural BMP Maintenance Information Attachment: Preliminary Design/Planning/CEQA level submittal: Attachment 2 must identify: I Typical maintenance indicators and actions for proposed trash capture BMP(s) based on Section 7.7 of the BMP Design Manual Final Design level submittal: Attachment 2 must identify: □ Specific maintenance indicators and actions for proposed trash capture BMP(s). This shall be based on Section 7. 7 of the BMP Design Manual and enhanced to reflect actual proposed components of the trash capture BMP(s) □ How to access the trash capture BMP(s) to inspect and perform maintenance □ Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt posts, or other features that allow the inspector to view necessary components of the trash capture BMP and compare to maintenance thresholds) □ Manufacturer and part number for proprietary parts of trash capture BMP(s) when applicable □ Maintenance thresholds for BMPs subject to siltation or heavy trash (e.g., silt level posts or other markings shall be included in all BMP components that will trap and store sediment, trash, and/or debris, so that the inspector may determine how full the BMP is, and the maintenance personnel may determine where the bottom of the BMP is . If required, posts or other markings shall be indicated and described on structural BMP plans.) □ Recommended equipment to perform maintenance □ When applicable, necessary special training or certification requirements for inspection and maintenance personnel such as confined space entry or hazardous waste management l r. 1 1. i ATTACHMENT 2.1 BMP MAINTENANCE THRESHOLDS BMP DESCRIPTION BMP-1 STORM WATER MANAGEMENT AND DISCHARGE CONTROL MAINTENANCE AGREEMENT APPROVAL NO: STORMTEK CONNECTOR PIPE SCREEN O&M RESPONSIBLE PARTY DESIGN££: JJO CHINQUIAPIN HOA POST-CONSTRUCTION PERMANENT BMP OPERATION & MAINTENANCE PROCEDURE DETAILS MAINTENANCE INDICATORS MAINTENANCE ACTION ACCUMULATION OF SEDIMENT, LITTER, OR DEBRIS REMOVE AND PROPERLY DISPOSE OF ACCUMULATED MATERIALS OBSTRUCTED INLET OR OUTLET STRUCTURE CLEAR OBSTRUCTIONS DAMAGE TO COMPONENTS OF THE FILTRATION SYSTEM REPAIR OR REPLACE AS APPLICABLE CLOGGED FILTER MEDIA REMOVE AND PROPERLY DISPOSE FILTER MEDIA, AND REPLACE WITH FRESH MEDIA MAINTENANCE EQUIPMENT AND ACCESS USE LANDSCAPE EQUIPMENT FOR MAINTENANCE; ACCESS BMP FROM PR/VA TE DRIVE AISLE OFF OF CH/NQUAPIN A VENUE PASCO LAREY SUITER a A880CIATE8 CML _,lalll. + LAND PLAIN•+ LAND IURVIYI• ...... -.,: as; Ille 111£. ......... CA_,. IIUIMIU •-IIMIU ...... .Al ....... _ -.. -... .. ... ... .. ... .. -.. .. .. -Ill .. ... .. -.. -------.. -- ---.. ... .. ATTACHMENT 3 City standard Trash Capture BMP Exhibit [Use the City's standard Trash Capture BMP Plan.] I :1 : I -7, .. :~i □~ . ' 1 , _J -:- a ---------. , 111--SD SD ii SD SD • Hr~..-'-cll ·--~-L-lt-e~~~H , N-34000'09"_W_ - _J ___ , __ -·--···----27il.78' - I: • , L__ t! ; ________ ,, __ , -·----···-·-··;:::-·-----+---~ l.laaaa.~~~=--=_J~--~--~-_;:. __ =--=-~-~-~------ SD I![) SD SD SD SD SD/ SD SD SD SD ii s so·•-SD :-SD SD I,, '· I . S: i (!) 0 I I 0 I !. ' 5 l----t:rl' I I iil I / s L__ I I· SD Slllll SD -------------_ :11 l.-v~~~5W~0tM~:~~~w1eaaa~~~~~-ru~~=-=:~::~1a.~~:~~~-~~~i~~=~~~~~:~~~n~g~Q~ ,·----- 1: PARTY RESPONSIBLE FOR MAINTENANCE: NAME __________ _ ADDRESS ________ _ PHONE NO. ________ _ PLAN PREPARED BY: NAME BRYAN KNAPP COMPANY PLSA ENGINEERING ADDRESS 1911 SAN DIEGOAVENUNE SAN DIEGO CA 92110 PHONE NO. f858\ 259-8212 BMP NOTES: CONTACT ______ _ SIGNATURE CERTIFICATION ____ _ 1. THESE BMPSARE MANDATORY TO BE INSTALLED PER MANUFACTURER'S RECOMMENDATIONS AND/OR THESE PLANS. 2. NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. 3. NO SUBSTITUTIONS TO THE MATERIAL OR TYPES OR PLANTING TYPES WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER. 4. NO OCCUPANCY WILL BE GRANTED UNTIL THE CITY INSPECTION STAFF HAS INSPECTED THIS PROJECT FOR APPROPRIATE BMP CONSTRUCTION AND INSTALLATION. 5. REFER TO MAINTENANCE AGREEMENT DOCUMENT. 6. SEE PROJECT SWQMP FOR ADDITIONAL INFORMATION. BMP CONSTRUCTION AND INSPECTION NOTES: THE EOWWILL VERIFY THAT PERMANENT BMPSARE CONSTRUCTED AND OPERATING IN COMPLIANCE WITH THE APPLICABLE REQUIREMENTS_ PRIOR TO OCCUPANCY THE EOW MUST PROVIDE: 1. PHOTOGRAPHS OF THE INSTALLATION OF PERMANENT BMPS PRIOR TO CONSTRUCTION, DURING CONSTRUCTION, AND AT FINAL INSTALLATION. 2. A WET STAMPED LETTER VERIFYING THAT PERMANENT BMPS ARE CONSTRUCTED AND OPERATING PER THE REQUIREMENTS OF THE APPROVED PLANS. 3. PHOTOGRAPHS TO VERIFY THAT PERMANENT WATER QUALITY TREATMENT SIGNAGE HAS BEEN INSTALLED. PRIOR TO RELEASE OF SECURITIES; THE-DEVROPE-R-JS RESPONSIBLE---- FOR ENSURING THE PERMANENT BMPS HAVE NOT BEEN REMOVED OR MODIFIED BY THE NEW HOMEOWNER OR HOA WITHOUT THE APPROVAL OF THE CITY ENGINEER. PLAN VIEW-TRASH CAPTURE EXHIBIT BMP ID# BMPTYPE SYMBOL TRASH CAPTURE BMPs CD PIPE CONNECTOR SCREEN LOW IMPACT DESIGN (L.I.D.) 0-0 ROOF DRAIN TO PERVIOUS AREA • SCALE: 1" = 10' HORIZONTAL TRASH CAPTURE BMP TABLE CASQA NO. QUANTITY DRAWING NO. SHEET NO.(S) TC-50 1 EA. SD-11 1 EA. INSPECTION FREQUENCY QUARTERLY ANNUALLY MAINTENANCE FREQUENCY AS NEEDED AS NEEDED t-lDRt ,,,~ z No. 86542 g:: Exp. 03 /31 /23 "" ?;;;-, a V1 \.. 0 10 20 LEGEND PROPERTY BOUNDARY CENTERLINE OF ROAD ADJACENT PROPERTY LINE PUBLIC RIGHT-OF-WAY 30 SCALE: 1" = 10' PASCO LARET SUITER ~ ffe.~~©tiffe.11E~ San Diego Solana Beach I Orange County Phone 858.259.82121 www.plsaengineering.com (!) ' i ' ---------- RCE ___ _ EXP. ____ _ DATE REVIEWED BY: INSPECTOR DATE l--------4f-----+------------+---+----+----+----I I SHEET I CITY OF CARLSBAD I SHEETS I ENGINEERING DEPARTMENT :::,;S;;;;IN::;:;G;;:;;LE:;;;:::S,:;H;;;;•;;:;;: fi;;:;;:1'::TRAS;;;;:;;::;:;;;;;H::C:;;:APTURE;:;;;:;;;;;;:;;::;::::;B;;:;MP::;;;:::::;:S:;;:;ITE;;:;:::P;;::LAN~~==: 330 CHINQUAPIN AVENUE APPROVED: JASON S. GELDERT ENGINEERING MANAGER RCE 63912 EXPIRES 9 DAlE DAlE INITIAL DA 1E INITIAL DAlE INITIAL ENGINEER OF WORK REVISION DESCRIPTION OTHER APPROVAL CITY APPROVAL -.. 111111 .. 1. Cover Letter 111111 .. .. .. .. .. .. .. ... .. .. .. 111111 .. ... .. .. .. .. 11111 ... .. .. ... 11111 ... ... ... ... ... ... 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: Vice President: Authorized Representative: Mailing Address: Keith Morgan Storm Water Inspection & Maintenance Services, Inc Chief Financial Officer and Office Manager keith@swimsclean.com (925) 783-9092 Todd Hudson Storm Water Inspection & Maintenance Services, Inc Vice President of Operations todd@swimsclean.com (925) 570-4575 Ric Campos Storm Water Inspection & Maintenance Services, Inc President and Owner ric@swimsclean.com (510) 773-5461 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/ ,,.. .. .. .. .. .. .. .. .. .. .. .. ... .. .. .. ... .. .. 111111 d. Manufacturing Location for Device Manufacturer Name: Manufacturer Address: Manufacturer Phone: Storm Water Inspection & Maintenance Services, Inc 698 Enterprise Court Livermore, CA 94550 (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 1111 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 Various streets in city Theresa Porter City of Milpitas Great Mall Pkwy, Milpitas Julie Waldron Blvd Apple Spaceship Campus 10955 N Tantau Ave, Preston Pipelines Cupertino, CA 95014 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 . Ric Campos Storm Water Inspection & Maintenance, Inc President/Owner ric@swimsclean.com (510) 773-5461 7/14/2021 Date iii ---.. ---... ... .. .. ... ... .. .. Ill ... .. .. .. ... .. .. -.. .. ... -... .. -... -.. ... ... ... ... 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 I. 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 lnformation ......................................................... 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 .................................................................... 1 O 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 lnformation ..................................................................................... 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 -.. .. .. 3. Physical Desription .. a. Trash Capture: Description of Device ... • 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. .. Ill .. ,. .. 11111 .. ... - Ill ... Ill -.. .. .. ... ... .. ... ... -.. .. .. .. .. • 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 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 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 Stormtek ST3 & ST3G Connector Pipe Screen Hydraulic Capacity FIitered Flow Peak/ Storage Stormtek (CFS) Bypass Flow Capacity device size Empty 25% Full 50% Full 75% Full 24x18x12r 5.86 3.81 2.07 .73 24 X 24 X 12r 9.02 5.86 3.19 1.13 24x30x12r 12.61 8.19 4.46 1.58 24 X 36 12r 16.57 10.76 5.86 2.07 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 (CFS) (CF) 10.29 .95 10.59 1.27 10.59 1.58 10.59 1.90 The tables in table above lists storage and hydraulic capacities for 4 common sizes of the Stormtek device 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 -.. 111111 .. ... .. -------.. -- -.. ---------------.. --- 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". I. 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 -.. - • 4. Installation Guidance ---------... -.. ---.. -- -.. ... --.. -------- 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 lnstalltion 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. 8 -.. --.. ... ----- --- ---.. ---- ---- ------ 5. Operation and Maintenance Information a. Device 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: 9 .. -.. -.. ... -... -... -----... ... --.. -- ---... ---... --- 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 . 10 6. Vector Control Accesibility a. Date of Submittal to Mosquito Vector Control Assocation 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 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 wit 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. deflector plate can lift-up tor inspection and treatment I) I I I I < I ( > I( I' I \ I I 111 I ~ I I' I H0\111 \"\UI 11 c. Letter of Verification from Mosquito Vector Control Association Refer to Appendix B for letter of verification from MVCAC 11 ... .. 111111 111111 ... ... .. - 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 extraordinarycircumstances . .., 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. 1111111 ... .. ... .. "" .. .. .. .. ... ... .. .. ... ... ... -... .. .. 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 12 --- -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. ----.. - -.. .. .. -.. ... ... ""' ... ... .... ... ... ... 13 ------,.. -------APPENDIX A -.. ... --... -.. ---------------14 ... StormTek™ ST3/ST3G Installation: Connector Pipe Screen Filter ~ Catch Basin Sump Plan View a) StormTek™ ST3/ST3G b) StormTek™ is installed in front of the outflow pipe is supported by the frame mounted on the existing catch basin wall c) This device is designed to capture trash, sediment and debris from entering the storm water system. StormTek™ ST3/ST3G Outflow Pipe Deflector Plate only ----- with ST3G Model ' -,"'·. . ' -' ' ¾_. . ·.,. . . ·,"· . -,', :., ' "·\ :·' " ., '· J:''•'.",. ,, . - ; ; " : , ·• , .,_. ' : ... ' ~- .--~ ... ,~~ ! --;, '; --.. •. Structural Support Bars:~··:·. (Bypass) .. _. -_ -.-.-~ _____ ·- Stain less Steel 1 11 flat bars 1/811 thickness ,.,"" Stainless Steel Frame .:,. ':1---(2 11 flat bars, 3/16 11 thick) J ·" I _.,,. mounted to wall Device fastens on pins Heavy-Gage Sheet Metal Screen S-304 Stainless Steel 5mm openings Section A 15 P.O. Box 1627 Discovery Bay, CA 94505 NorCal: 925.516.8966 SoCal: 949.542.7234 www .swi msclean .com General Notes: -Bypass has equivalent or greater flow rate as outflow pipe -Device is retro-fitted to catch basin specifications -Deflector plate is the only difference between ST3 & ST3G 1 10/25/2018 No. Revision/Issue Company Name and Address: P~e-:-Box 1627 Discovery Bay, CA 94505 Product Name and Address: StormTek™ Pipe Screen Model ST3/ST3G Project: StormTek™ Scale: No Scale Sheet: 1 of 1