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CD 14-17; 5909 SEA OTTER PL; WATER QUALITY TECHNICAL REPORT; 2015-07-16
E TABLE OF CONTENTS 1.0 Declaration of Responsible Charge 2.0 Summary of Project Information 3.0 Pre-Project Site Conditions and Drainage Patterns Narrative 3.1 Site Development Constraints 4.0 Proposed Site Development and Drainage Patterns Narrative 4.1 Site Development Opportunities 5.0 Sources of Pollutants from the Existing Site Narrative 6.0 Project Hydrologic Location 7.0 Identification of 303(d) Impaired Receiving Waters 8.0 Identification of Pollutants Associated with Priority Project Category 9.0 Identification of Pollutants of Concern 10.0 Tabulation of Rational Method Hydrology Results 11.0 Hydromodification Management Plan (HMP) Applicability Determination 11.1 Summary of HMP Compliance Approach 12.0 Permanent Source Control Best Management Practices (BMPs) 13.0 Identification of BMPs Applicable to Individual Priority Project Categories 14.0 Implementation of Site Design Low Impact Development (LID) Practices 15.0 Calculations for 85th Percentile Flow (Volume Based Calculation) 16.0 Existing Curb Inlet Calculations 17.0 Treatment Facilities for Special Circumstances 18.0 Relative Effectiveness of Project Treatment Facilities and IMPs 19.0 Projected Storm Water BMP Maintenance Mechanism TWIN ATLAS BULDING SEPARATION (Permit Application Number, ) K&S ENGINEERING, INC. Priority Development Water Quality Technical Report 20.0 Summary and Conclusion Narrative Appendix Vicinity Map Soil Type Exhibit Federal Emergency Management Agency (FEMA) Map Storm Water Quality Checklist and Certification Geotechnical Study reference (NOT AVAILABLE AT THIS TIME) HMP Calculations (NOT REQUIRED) Proprietary BMP Manufacturer Information and Specifications Construction Plan Set Reference Information TWIN ATLAS BULDING SEPARATION (Permit Application Number, ) K&S ENGINEERING, INC. Priority Development Water Quality Technical' Report 1.0 Declaration of Responsible Charge I hereby declare that the design and preparation of the Priority Development Project Water Quality Technical Report (WQTR) complies with the Professional Engineering Standards and conforms to the requirements of the Regional Water Quality Control Board, San Diego Region. As the Engineer in Responsible Charge of the design of this Water Quality Technical Report, I assume full responsible charge for the design of the Plan. I understand and acknowledge that the plan check review of the Water Quality Technical Report by the City of Carlsbad is a review for the limited purpose of ensuring the Plan and design complies with requirements of the City, Regional Water Quality Control Board, San Diego Region, and other applicable policies and ordinances. The review of this plan by City Staff is not a determination of the technical adequacy of the design of Water Quality Technical Report. Such review of the Plan does not relieve me of my responsibility for the design and content of the Water Quality Technical Report for: TWIN ATLAS BULDING SEPARATION 48592 6/30/2016 Engineer-of-Work RCP flte K&S ENGINEERING, INC. Company I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report I Page 1 K&S ENGINEERING, INC. I I K&S ENGINEERING, INC. TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report Page 2 2.0 Summary of Project Information Item Project Information Project Name TWIN ATLAS BULDING SEPARATION Application Number(s) Project Address 5909 Sea Otter Place, Carlsbad CA 92010 Assessor Parcel Number(s) 209-082-09-00 Total Project Area 14.32 acres 623,780 square feet Proposed Project Description and Parking lot reconfiguration, removal and replacement of A.C. Land Use pavement, building split, hardscape and landscape removal and replacement on a Commercial Site. Housing Development of 10 or more dwelling units Commercial Development of one acre and greater Heavy Industry of one acre and greater Automotive Repair Shop III! Restaurant Applicable Priority Development Hillside Development greater than 5,000 square feet Project Categories L Water Quality Environmentally Sensitive Area (WQESA) Parking Lot Street, Highways, and Freeways Lii Retail Gasoline Outlets Z Land Disturbance greater than one acre El Increases or Z Increases or Redevelopment Project that Creates Not Replaces >50% of Replaces <50% of or Replaces 5,000 square feet of Applicable Pre-Project Pre-Project Impervious Surface Impervious Impervious Surface I Surface Project Disturbed Area 1.56 acres 68,030 square feet Predevelopment Impervious Area 0.95 acres 41,255 square feet Proposed Impervious Area 0.76 acres 33,252 square feet Proposed Pervious Area 0.80 acres 34,778 square feet Santa Margarita 0 Encinas Project Hydrologic Unit Watershed San Luis Rey Agua Hedionda 904.3 Loma Alta Z Carlsbad 904 LI Buena Vista Creek LI San Marcos Project Hydrologic Soil Group A B 0 C TND * Number of Discharge Locations I Location Required to Implement HMP Yes Z No * Number of HMP Compliance Points N/A I I I I I I I I I III I I I I I I I I 3.0 Pre-Project Site Conditions and Drainage Patterns Narrative In existing condition, the project site is totally developed with existing commercial building, parking lot, hardscape and landscape areas, the on-site drainage is divided into three different surface basins, which ultimately will confluence on the same point of connection via underground storm drain at the most southwesterly corner of the property where the existing type F inlet is located. The public underground storm drain system will direct the runoff north along El Fuerte Dr towards Agua 1-ledionda Creek then west towards Agua Hedionda Lagoon outleting on the Pacific Ocean. 11 TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report Page 3 K&S ENGINEERING, INC. 3.1 Site Development Constraints Applicable Site Development Constraints Limited Available Hydraulic Head Z Impermeable Soils / High Groundwater Contaminated Soils Geotechnical Instability Perimeter Conditions High Intensity Land Use LI Heavy Pedestrian Traffic LI Heavy Vehicular Traffic Li] Restricted Right-of-Way Existing Easements Inadequate Downstream Drainage Infrastructure LI Public Safety Concerns Other Comments: The site is fully developed, therefore it is not feasible to introduce a Bio-retention system at the ultimate discharge point. To compensate, the project has introduced pervious areas to reduce the impermeable areas from the existing condition. The more adequate means of treatment will be the construction of two Filterra Unit that will treat an equivalent area of the removal and replacement area. TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 4 4.0 Proposed Site Development and Drainage Patterns Narrative The proposed project consist of a reconfiguration on the parking lot, removal of existing building area to fully separate them it into two buildings as well as removal and replacement of hardscape and landscape areas. After splitting the buildings a court yard will be constructed mainly with payers and landscape surfaces. The on-site drainage pattern will remain the same as the existing condition where will eventually flow into Agua Hedionda Creek then west towards Agua Hedionda Lagoon outleting on the Pacific Ocean. See BMP structure information on Appendix 7. TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 5 I 1 4.1 Site Development Opportunities Applicable Site Development Opportunities LI Adequate Available Hydraulic Head Permeable Soils LI Groundwater Separation LI Geotechnical Stability Perimeter Conditions Existing Natural Areas LI Undevelopable Areas Adequate Downstream Drainage Infrastructure LI Other Comments: The project has an adequate underground storm drain system that adequately will direct runoff without affecting the down stream condition. I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report I Page 6 K&S ENGINEERING, INC. I 1 5.0 Sources of Pollutants from the Existing Site Narrative Watershed and Receiving Waters I According to the State of California, Regional Water Quality Control Board, San Diego Hydrologic Basin Planning Area, the Project is located in the Carlsbad Watershed hydrologic unit (HU) and the Agua Hedionda 904.3 hydrologic Area (HA). The area is characterized by I mostly moderately sloping land occupied by predominately non-native grass and urban uses. I Land use within the watershed is dominated by urban development. Natural habitats are scattered and occur in a matrix of agricultural and urban development, however several relatively large patches of native vegetation occur in the eastern portion of the watershed and in the central I area just inland from Agua Hedionda Lagoon. The cities of Carlsbad, San Marcos, and Encinitas are located entirely within the HU. Approximately 48% of the Carlsbad HU is urbanized. The dominant land uses are residential (29%), commercial/industrial (6%), freeways/roads (12%), I agriculture (12%), and vacant/undeveloped (32%). The Agua Hedionda HA comprises approximately 14% of the HU. I The Project's 1.56 acres represents an extremely small percentage of the approximately 210 square miles (134,400 acres) of the hydrologic unit area and representing 0.1% of the hydrologic unit area. The "Project" will not alter the overall drainage pattern of the site before I entering the storm drainage system. The Project will not have an impact on the hydrologic unit because there will be proper implementation and maintenance of the permanent BMPs outlined in this report and the proper implementation of the flood control analysis. 303(d) Listed Receiving Waters Constituents of concern for the Carlsbad HU include coliform bacteria, nutrients, sediment, trace metals, and toxics. The Agua Hedionda, Buena Vista, and San Elijo lagoons are experiencing impairments to beneficial uses due to excessive coliform bacteria and sediment loading from upstream sources. These coastal lagoons represent critical regional resources that provide freshwater and estuarine habitats for numerous plant and animal species. Other water bodies in the Carlsbad HU have been identified as impaired on the California 303(d) list for elevated coliform bacteria. Total Maximum Daily Loads (TMDLs) Currently there are no Total Maximum Daily Loads (TMDLs) listed. I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report I Page 7 K&S ENGINEERING, INC. I I Beneficial water uses within the Carlsbad Watershed as designated in the State Water Resources Control Board's San Diego Region Basin Plan. Beneficial Uses Inland Surface Coastal Waters Reservoirs and Ground Water Water Lakes Municipal and Domestic Supply X x 0 Agricultural Supply x x o Industrial Service Supply x x x 0 Navigation x Hydropower Generation X x Contact Water Recreation x x x Non-Contact Water Recreation x x x Commercial and Sport Fishing x Warm Freshwater Habitat x x x Cold Freshwater Habitat x x Estuarine Habitat x Wildlife Habitat x x x Biological Habitats x Rare, Threatened, or End. X x Marine Habitat x Migration of Aquatic Organisms x Aquaculture x Shellfish Harvesting x Spawning, Reprod. and/or Early x Develop. X Existing Beneficial Use 0 Potential Beneficial Use I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report I Page 8 K&S ENGINEERING, INC. I I Carlsbad Watershed Hydrologic Unit 11, I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report Page 9 K&S ENGINEERING, INC. 6.0 Project Hydrologic Location Hydrologic Unit Hydrologic Area Hydrologic,",Sub-Area Carlsbad 904.00 Loma Alta 904.10 Not Applicable Buena Vista Creek 904.20 El Salto 904.21 Vista 904.22 Agua Hedionda 904.30 M Los Monos 904.31 TWIN ATLAS BULDING SEPARATION (Permit Application Number, ) K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 10 7.0 Identification of 303(d) Impaired Receiving Waters Pollutant(s) Causing Receiving Water Impairment t6303(d) Receiving Water Enterococcus Fecal Coliform Manganese Phosphorus Agua Hedionda Creek 90431000 (7 Miles) Selenium Sulfates Total Dissolved Solids Total Nitrogen as N Toxicity III Buena Vista Creek 90421000 (11 Miles) Sediment Toxicity Selenium Indicator Bacteria LI Buena Vista Lagoon 90421000 (202 Acres) Nutrients Sediment/Siltation LI Guajome Lake 90311000 (33 Acres) Eutrophic LI Loma Alta Creek 90410000 (7.8 Miles) Selenium Toxicity LI Loma Alta Slough 90410000 (8.2 Acres) Eutrophic Indicator Bacteria LI Oceanside Harbor 90421000 (52 Acres) Copper El Pacific Pacific Ocean Shoreline, Loma Alta HSA, at Loma Alta Creek Mouth Indicator Bacteria (0.03 Miles) E]90311000(0.03 Pacific Ocean Shoreline, San Luis Rey flU, at San Luis Rey River Mouth Enterococcus Miles) Total Coliform DDT Manganese LI Escondido Creek (904.5) Phosphate Selenium Sulfates Total Dissolved Solids LI Santa Margarita Lagoon 90211000 (28 Acres) Eutrophic Enterococcus LI Santa Margarita River (Lower) 90211000 (19 Miles) Fecal Coliform Phosphorus Total Nitrogen as N TWIN ATLAS BULDING SEPARATION (Permit Application Number, ) K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 11 I I 8.0 Identification of Pollutants Associated with Priority Project Category Priority Project Category General Pollutant Categories Sediment Nutrients Detached Residential Trash & Debris '' Development Oxygen Demanding Substances Oil & Grease Bacteria & Viruses Pesticides Sediment Nutrients El Attached Residential Trash & Debris Development Oxygen Demanding Substances (if landscape exists on-site) Oil & Grease (if uncovered parking areas exist on-site) Bacteria & Viruses Pesticides Sediment (if landscape exists on-site) Nutrients (if landscape exists on-site) Heavy Metals Organic Compounds (if uncovered parking areas exist on-site) Commercial Development Trash & Debris Oxygen Demanding Substances (includes solvents) Oil & Grease Bacteria & Viruses (if land use includes food or animal waste products) Pesticides (includes solvents) Sediment Heavy Metals El Heavy Industry or Organic Compounds Industrial Development Trash & Debris Oxygen Demanding Substances Oil & Grease I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report I Page 12 K&S ENGINEERING, INC. 8.0 Identification of Pollutants Associated with Priority Project Category (continued) Priority Project Categories . General Pollutant Categories-,,, Heavy Metals Organic Compounds (includes petroleum hydrocarbons and Automotive Repair Shop solvents) Trash & Debris Oil & Grease Trash & Debris Oxygen Demanding Substances Lii Restaurants Oil & Grease Bacteria & Viruses Pesticides (if landscape exists on-site) Sediments Nutrients Hillside Development Trash & Debris Oxygen Demanding Substances Oil & Grease Pesticides Sediments (if landscape exists on-site) Nutrients (if landscape exists on-site) Heavy Metals Parking Lots Trash & Debris Oxygen Demanding Substances (if landscape exists on-site) Oil & Grease Pesticides (if landscape exists on-site) Heavy Metals Organic Compounds LI Retail Gasoline Outlets Trash & Debris Oxygen Demanding Substances Oil & Grease Sediments Nutrients (if landscape exists on-site) Heavy Metals Organic Compounds (including petroleum hydrocarbons) LI Streets, Highways & Freeways Trash & Debris Oxygen Demanding Substances (includes solvents) Oil & Grease Bacteria & Viruses Pesticides (if landscape exists on-site) TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 13 This section of the WQTR identifies pollutants of concern. Pollutants of concern are those that are anticipated to be generated by the proposed project during the development process, as well as from the intended use of the site. Additionally, if the project will drain to a receiving water body that is impaired for a pollutant anticipated from that project, that pollutant is also a pollutant of concern Pollutants of Concern Indicator bacteria, nutrients, and sediment From page 11, the pollutant of concern for the receiving water area is as follows: Enterococcus Fecal Coliform Manganese Phosphorus Selenium Sulfates Total Dissolved Solids Total Nitrogen as N Toxicity TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 14 I 1 9.0 Identification of Pollutants of Concern Pollutants Associated with Priority Project Pollutants Causing Impairment to 303(d) Pollutants of Category Receiving Water(s) Concern LI Chloride Sediment/Siltation Copper Sediment Toxicity Sediment Nutrients Selenium Z Sediment Phosphorus Z Sulfates Z Sediment Z Total Nitrogen as N Chloride Z Sulfates Nutrients Eutrophic Nutrients Total Dissolved Solids Total Nitrogen as N Nutrients 0 Phosphorus E Toxicity Lii Copper Z Sulfates Heavy Metals E Manganese Z Total Dissolved Solids Heavy Metals LI Sediment Toxicity Z Toxicity Organic Compounds Eutrophic Sediment Toxicity Toxicity El Organic Compounds Trash & Debris LI Eutrophic Nutrients Total Dissolved Solids Trash & Debris El Toxicity Sediment Toxicity • Oxygen Demanding Eutrophic Sulfates Lii Nutrients Total Dissolved Solids Oxygen Demanding Substances Substances Oil & Grease Phosphorus Z Total Nitrogen as N • Eutrophic Z Sediment Toxicity Toxicity J_ Oil & Grease Bacteria & Viruses Enterococcus El Eutrophic Total Colirorm Indicator Bacteria Bacteria & Viruses Z Fecal Col iform LI Copper LI Sediment Toxicity °' Pesticides Sulfates El Phosphate fl Pesticides Z Toxicity Total Nitrogen as N TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 15 10.0 Tabulation of Rational Method Hydrology Results - Pre-Project Rational Method Hydrology Results (Existing condition site) Storm Frequency P6 (adjusted) C I Area (acres) T (cfs) 100-year 2.5 0.85 6.58 1.56 10 4.21 Post Development Rational MethOd Hydrology Results (Proposed condition site) Storm Frequency P6 (adjusted) C I Area (acres) Tc (cfs) 100-year 2.5 0.85 6.58 1.56 10 4.21 HYDROLOGIC & GEOTECHNICAL CONDITIONS OF CONCERN! DRAINAGE REPORT Project has previously been developed, then the "C "factor is the same on the pre and post condition. There are no hydrologic conditions of concern since the ultimate project runoff is being directed to an existing underground system. See section 3 and 4for project pre and post respectively drainage pattern description. TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 16 11.0 Hydromodification Management Plan (HMP) Applicability Determination Does Project YES Increase Impervious Area? NO its Projects ES 2. Proper Energy Dissipati>2 Provided? Redesign Energy: Dissipation System NO Does rolect NO Increase Unmitigated Peak YES I Flows to Any Outlet IF Location? Y ES Does Project NO Direcily Discharge to :ft2Exempt ES Does Project NO Directly Discharge to Lagoon Area? Does Stabilized YES Does Project Directly Conveyance have Capadly Discharge to Stabilized Cones I or Ultimate Q? to Exempt System? NO NO YES 9. Does Project '. Discharge to Highly Urbaniz Watershed? NO Ii. Determine Domain of Analysis YES 10. Is Project Urban Se HMP Section 52 null Discharging to Stabiiiz Conveyance? NO 12. Does Stabilized YES Conveyance Extend Past NO Domain of Analysis and Eventually Discharge to LOW Susceptibility Stream? YES 13. Do Cumulative N Future Impacts Represent 3% Impervious Area [HMP xempt f Increase? IF 14. Hydromodification Controls Required End of Decision Matrix Go to Figure 6-2 of Decision Matrix ( Figure 6-1. HMP Applicability Determination TWIN ATLAS BULDING SEPARATION (Permit Application Number, ) K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 17 I 11.0 HMP Applicability Determination (continued) HMP Applicability Determination Summary Node Component Response Response 1 Priority Development Project Yes - Go to Node 2 II No - Exempt 2 Proper Energy Dissipation Yes - Go to Node 3 Intentionally left blank Go to Node 3 3 Increase Impervious Area LII Yes - Go to Node 5 No - Go to Node 4 4 Increase Unmitigated Peak Flows to Any Outlet Location LII Yes - Go to Node 5 No - Exempt Direct Discharge to an Exempt El Yes - Exempt No - Go to Node 6 System 6 Direct Discharge to a Tidally EJ Yes - Potentially No - Go to Node 7 Influenced Lagoon Area Exempt 7 Direct Discharge to Stabilized Conveyance to Exempt System LI Yes - Go to Node 8 LII No - Go to Node 9 Does Stabilized Conveyance 8 Have Capacity to Convey LII Yes - Exempt LI No - Go to Node 9 Ultimate Q 1 Discharge to Highly Urbanized Area Yes - Exempt EJ No - Go to Node 10 10 Urban Infill Project Discharging to Stabilized Yes - Go to Node 11 LI No—HMP Controls Required Conveyance Go to Node 14 11 Determine Domain of Analysis E]Yes - Go to Node 12 Intentionally Left Blank Does Not Apply to Node 11 Stabilized Conveyance Extends 12 Beyond Domain of Analysis El Yes - Go to Node 13 LI No - HMP Controls Required and Eventually Discharges to Go to Node 14 LOW Susceptibility Stream 13 Cumulative Future Impacts Represent <3% Impervious LI Yes - Exempt El No - HMP Controls Required Area Increase Go to Node 14 14 Go to HMP Figure 6-2 Mitigation Criteria and Implementation Comments: See attached Figure 6-2 under appendix 9. Reference information. I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report I Page 18 K&S ENGINEERING, INC. 11.1 Summary of HMP Compliance Approach Not Applicable - Project Exempt from HMP requirements LIII Determine/Identify Point(s) of Compliance El Utilize SCCWRP Screening Tools to determine Stream Susceptibility LII Default to a High Susceptibility Stream (0.1Q2) LI Utilize an appropriate HMP Sizing Tool to demonstrate HMP compliance Summary of Project LI Utilize HMP Sizing Tables to demonstrate HMP compliance HMP Compliance Approach LI Utilize an approved Continuous Simulation Model and compare pre- project and mitigated post-project flows to demonstrate HMP compliance LI HEC-HMS LIHSPF 41 LII SDHM F SwMIM LI Provide comprehensive, digital support data, calculation method and parameters, and calculation results on Compact Disk (CD) sufficient to duplicate study and support a RWQCB audit TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 19 12.0 Permanent Source Control Best Management Practices (BMPs) Source Control BMP Applicable implementation Requirements Provide prohibitive dumping placards and/or signage Post signage at public access points to deter prohibitive Storm Drain Inlet Labeling dumping El Maintain legibility of placards and signage Not Applicable Comment: All on-site and within project frontage Storm drain inlets shall be stenciled with placard or signage indicating prohibitive waste dumping language El Materials placed in an enclosure (e.g. cabinet, shed, or similar structure that prevents contact with rain, runoff or spillage to the storm water conveyance system) Protected by secondary containment structures (e.g. berms, dikes, or curbs) and paved or sufficiently impervious to Outdoor Material Storage Areas contain leaks and spills The storage area is paved and sufficiently impervious to contain leaks and spills Lii Includes a roof or awning to minimize direct precipitation to the secondary containment area Not Applicable Comment: I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report I Page 20 K&S ENGINEERING, INC. I I K&S ENGINEERING, INC. TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report Page 21 12.0 Permanent Source Control BMPs (continued) Source ControU BMP 'All Applicable Implementation Requirements Paved with an impervious surface Designed not to allow run-on from adjoining areas Screened or walled to prevent off-site transport of trash Common Trash Enclosure and Recyclable Material Storage Z Use trash containers with attached lids to exclude rain and Areas maintain lids in closed position while not in use and/or include a roof or awning to minimize direct precipitation. Acknowledgment that installation of storm drain inlets or area drains in designated trash storage areas is prohibited LI Not Applicable Comment: Project is not proposing to construct new trash enclosure areas but the existing already designated areas will use trash containers with lids to exclude the rain. Plant pest-resistant or well-adapted plant varieties such as drought tolerant and/or native plants Discourage pests by modifying the site and landscaping design Distribute IPM educational materials to future occupants as part of the final engineering phase Operation and Maintenance Plan (O&M Plan) which addresses physical pest Employ Integrated Pest Management (IPM) Practices elimination techniques such as relying on natural enemies to consume pests, weeding, pruning, and etc. Emphasis placed on correct and limited use of pesticides as a last line of defense Not Applicable Comment: I I I I I I I 12.0 Permanent Source Control BMPs (continued) Source Control BMP Applicable Implementation Requirements Employ rain shutoff devices to prevent irrigation during and after precipitation Design irrigation systems for the specific water requirements of each landscape area LI Use flow reducers or shutoff valves triggered by a pressure drop to control water loss in the event of broken sprinkler heads or lines Use of Efficient Irrigation Systems & Drought Tolerant Landscape Design LI Provide water conservation educational materials to future occupants as part of final engineering phase Operation and Maintenance Plan (O&M Plan) Acknowledgment that Landscape & Irrigation plan is required to be consistent with City of Carlsbad Landscaping Ordinance Not Applicable Comment: Equipped with a clarifier or other pretreatment facility approved by the City Engineer Properly connected to a sanitary sewer or, Lii Interior Floor Drains and Elevator Shaft Sump Pumps D An alternate method, as approved by ihe City Engineer Acknowledgment that direct connection of interior floor drains and elevator shaft pumps to private or public storm drain or sanitary sewer is not permissible Not Applicable Comment: TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report Page 22 K&S ENGINEERING, INC. I 12.0 Permanent Source Control BMPs (continued) Source Control BMP Applicable Implementation Requirements Li Interior Parking Garages Equipped with Floor Drains LI Prohibit vehicle washing LI Prohibit pressuring washing of parking surface in the parking garage and Ej Provide adequate treatment control BMPs to treat runoff prior to discharge to an MS4 and Li Provide prohibitive dumping signage and floor drain marking; prominently displayed inside the parking garage and at the floor drains, respectively and; LI Implement dry clean-up methods for non-hazardous accidental spills Ej Equipped with a clarifier or other pretreatment facility LI Properly connected to a sanitary sewer or An alternate method, as approved by the City Engineer LI Acknowledgment that direct connection of interior floor drains and elevator shaft pumps to the sanitary sewer or storm water conveyance is not permissible Not Applicable Comment: LI Pet Use Areas El A pet waste station that includes eye level, post mounted signage which reads "pick-up after your pet" or similar approved language and Li A pet waste disposal receptacle equipped with a lid Not Applicable Comment: TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 23 I I 13.0 Identification of BMPs Applicable to Individual Priority Project Categories Individual Priority Project Category Applicable Best Management Practice Private Roads Rural Swale System Urban Curb/Swale System Dual Drainage System El An alternate method, as approved by the City Engineer Not Applicable Comment: Residential Driveways & Guest Parking LI Designed to drain into adjacent landscape prior to discharging to a storm water conveyance LI Shared access LI Flared or piano shaped entrance (single lane at street) LI Wheelstrips (paving only under tires) LI Porous paving/Permeable surface Not Applicable Comment: I TWIN ATLAS BULDING SEPARATION (Permit Application Number, ) K&S ENGINEERING, INC. Priority Development Water Quality Technical Report I Page 24 I I 13.0 Identification of BMPs Applicable to Individual Priority Project Categories (continued) Individual Priority Project Category Applicable Implementation Requirements LI Covered loading dock areas or, Designed to preclude urban run-on and runoff Containment method to isolate dock and facilitate pollutant removal, such as a shut-off valve and containment area Equipped with a clarifier or other pretreatment facility LI Dock Areas (Truck Wells) An alternate method, as approved by the City Engineer Acknowledgement that direct connections to storm drains from depressed loading docks are prohibited Not Applicable Comment: There will be no modification or reconstruction of the existing docks. LI Located indoors and, Designed to preclude urban run-on and runoff from adjacent areas LI Self contained bay drainage system (i.e. dead-end sump, with no outlet to offsite facilities) designed to capture all wash Maintenance and Repair Bays water, leaks, and spills. The self contained drainage system shall connect to a "dead end sump" for collection and proper disposal LI Acknowledgement that connection of maintenance and repair bay drains to the sanitary sewer or storm water conveyance system is prohibited. Not Applicable Comment: I TWIN ATLAS BULDING SEPARATION (Permit Application Number, ) K&S ENGINEERING, INC. Priority Development Water Quality Technical Report I Page 25 I I 13.0 Identification of BMPs Applicable to Individual Priority Project Categories (continued) 'ndvjduI Priorityf Project Category Applicable Best Management Practice LI Vehicle and Equipment Wash Areas Li Paved with an impervious surface Li Self-contained to preclude urban run-on and runoff LII Preferably located indoors or, Li Covered with a roof or overhang Li Equipped with a clarifier or other pretreatment facility Li Properly connected to a sanitary sewer or, LI An alternate method, as approved by the City Engineer LI Acknowledgement that connection of vehicle and equipment wash areas to the storm water conveyance system is prohibited Not Applicable Comment: Li Outdoor Processing Areas Li Cover or enclose areas of that are a source of pollutants, Li Grade or berm the perimeter of the processing area to prevent run-on or runoff Li Sloped to a self contained drainage system (i.e. "dead-end sump", with no outlet to offsite facilities) designed to capture all wash water, leaks, and spills. The self contained drainage system shall connect to a "dead end sump" for collection and proper disposal Li Equipped with a clarifier or other pretreatment facility Li Properly connected to a sanitary sewer or, Li An alternate method, as approved by the City Engineer Li Acknowledgement that installation of storm drain inlets in outdoor processing areas and connection to a storm water conveyance system is prohibited Z Not Applicable Comment: I TWIN ATLAS BULDING SEPARATION (Permit Application Number, ) K&S ENGINEERING, INC. Priority Development Water Quality Technical Report I Page 26 13.0 Identification of BMPs Applicable to Individual Priority Project Categories (continued) Individual Priority Project Category Applicable, Best Management Practice Paved with an impervious PCC surface Graded at a minimum slope to prevent pond formation Separated by grade break, curb, or berm to prevent run-on Covered with a canopy that extends a minimum often feet in each horizontal direction, for each pump, or alternatively; Covered the fuel area with minimum dimensions equal to or LI Fueling Areas greater than the area within the grade break or fueling area (defined as extending 6.5 feet from the corner of each fuel dispenser or the length at which each hose and nozzle assembly may be operated plus one foot, whichever is greater The canopy shall not drain to the fueling area LI Acknowledgement that connection of fueling areas to the sanitary sewer or storm water conveyance system is prohibited Not Applicable Comment: Where landscaping is proposed in surface parking areas (both covered and uncovered), incorporate landscape areas into the drainage design LI Overflow parking (i.e. parking in excess of the minimum Retail and Surface Parking Areas parking requirements for the project) may be constructed of permeable paving LI Not Applicable Comment: There will be some drivable areas that will be constructed with payers. II I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report Page 27 K&S ENGINEERING, INC. 13.0 Identification of BMPs Applicable to Individual Priority Project Categories (continued) Individual Priority Project Category Applicable Best Management Practice Steep hillside areas disturbed by project development shall be landscaped with deep rooted, drought- tolerant plant species selected for erosion control and stabilized with Steep Hillside Landscaping mulch, consistent the City Water Efficient Landscaping Ordinance lO-0R0412-1 and the statewide Water Conservation in Landscape Act Not Applicable Comment: Specific water quality measures during construction are delineated in the BMP plan that will be prepared. II TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 28 14.0 Implementation of Site Design Low Impact Development (LID) Practices LID Préctice Applicable Design Characteritics Preserve natural drainage features Preserve existing trees and vegetation Minimize soil disturbance Clustering or concentrating development on the least Conserve Natural Areas environmentally sensitive areas; consistent with SUSMP §4.1 (e.g. developing on... previously graded areas, areas containing of non-native vegetation and etc.) Incorporation of open space Lot(s) An alternate method, as approved by the City Engineer Not Applicable Comment: Project has been fully developed. Minimize the impervious footprint by increasing building density and/or by incorporating multiple-storied architecture Construct streets, sidewalks, and parking lot drive aisles to minimum widths, provided public safety is not compromised Incorporate landscape buffers between sidewalks, streets, Minimize Impervious Surfaces and other flatwork Z Minimize impervious surfaces in landscape design; such as decorative or stamped concrete Using permeable surfaces (porous concrete, payers, asphalt) in overflow parking or low-traffic areas LI An alternate method, as approved by the City Engineer LI Not Applicable Comment: On the southerly parking lot the project is proposing to incorporate payers, to allow for runoff to run through pervious areas before entering the storm drain system. Project has minimized the impervious areas also, by providing the minimum number of vehicle parking spaces allowed, utilizing minimum driveway and aisle widths while maintaining sufficient space for vehicle and pedestrian maneuvering safety and add payers to new patio and walkway paths. There will be no increase on runoff, in the contrary it will be reduced by incorporating more permeable areas to the project; therefore it should not create any downstream erosion problems. TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 29 I 14.0 Implementation of Site Design Low Impact Development (LID) Practices (continued) LID Practice Applicable Design Characteristic Protect Slopes and Channels El Minimize disturbance to natural drainages Convey runoff safely from the tops of slopes LI Vegetate slopes with native or drought tolerant landscape Lii Stabilize permanent channel crossings LI Install Energy Dissipaters Lii An alternate method, as approved by the City Engineer Not Applicable Comment: No slopes will be disturbed and all on-site drainage is directed away from the slopes. LID Site Design Strategies and BMPs The Project has incorporated the described below specific site design characteristics to provide a minimum U of impervious areas on the site. Maximum number of compact car parking spaces allowed by code to reduce the pavement areas Minimum parking spaces allowed by code to reduce the pavement areas Walkway paths will be constructed with payers. I Landscaped areas provide an efficient use of permeable areas. The landscaped areas of the site will utilize native or drought tolerant species in the planting scheme. I Installation and monitoring of the irrigation system for these landscape areas to reduce over-irrigation, thereby reducing the oversaturation of the area leading to excess runoff. There are no natural areas since the project was previously developed. All storm flows will exit the site in the same locations as in the existing condition. There will be no increase in post-development peak flow. I I U TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report Page 30 K&S ENGINEERING, INC. I LI I I I 15.0 Calculations for 85th Percentile flow (volume based calculations) See appendix 7for BMP structure calculations. TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 31 16.0 Curb Inlet Calculations There is no curb inlet proposed on this project. TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 32 17.0 Treatment Facilities for Special Circumstances Proprietary Vault/Tree Well DMA N2 me - pD-I A = Total DMA (acres) 1.56 acres Impervious Area (ft2) 33,252 ft2 Pervious Area (ft2) 34,778 ft2 Percent Impervious 49% Soil Type D C = Runoff Coefficient per SD County Hydrology Manual, Table 3-1 0.85 = Rainfall (inches) 6.58 in Water Quality Flow (Treatment Only) = WQflow = CIA, where 1= 0.2 in/hr 0.27 cfs Manufacturer Filterra Bioretention System Model 6xlOunit Capacity 0.82 acres each Total Area of DMA 1.56 acres Project is proposing to install two Filterra Bioretention System to treat the entire disturbed area. Each unit treats 0.82 acres, then total treatment capacity will be 1.64 acres, which is more than the disturbed area. TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 33 18.0 Relative Effectiveness of Project Treatment Facilities - -v Relative Effectiveness of Project Treatment Facilities and IMPs Treatment Facility/IMP Pollutants Grouped by Method of Transport Coarse Sediment and Trash Pollutants Associated with Fine Particles During Transport Pollutants that tend to be Dissolved Following Treatment LII Bioretention IMP High High Medium LI Flow Through Planter IMP High High Medium LI Infiltration IMP High High High LI Conventional Vegetated Swale High Medium Low LI Extended (Dry) Detention Basins High High Low Media (Sand) Filter High High Low' Wet Pond High High Medium LI Constructed Wetland High High Medium Proprietary Vault/Tree Well High Medium Low LI Proprietary Inlet Filter High Low Low As discussed in Section 8 page 14 of this report, the Development Pollutants of Concern are: Indicator Bacteria, nutrients and sediments. The proposed Filterra Bioretention System-High Performance Media utilizes physical, ' chemical and biological mechanisms of a soil, plant and microbe complex to remove pollutants typically found in urban storm water runoff The treatment system is designed for in the urban landscape to treat contaminated runoff I applications Storm water flows through a specially designed filter media mixture contained in a I landscape concrete container. The mixture immobilizes pollutants which are then decomposed, volatilized and incorporated into the biomas of the filterra system's micro/macro fauna and flora. In summary the contaminated storm water runoff enters the filter box through curb inlet spreading over the 3" layer of mulch on the surface of the filter I media. As the water passes through the mulch layer, most of the large sediment particles and heavy metals are removed through sedimentation and chemical reactions with the organics I materials in the mulch. Water passes through the soil media where the finer particles are removed and other chemical reactions take place to immobilize and capture pollutants in the soil media. The cleansed water passes into an underdrain and flows to a pipe system or other appropriate discharge point. Once the pollutants are in the soil the bacteria begins to break I down and metabolizes the materials and the plant begin to uptake and metabolize the I TWIN ATLAS BULDING SEPARATION (Permit Application Number, ) K&S ENGINEERING, INC. Priority Development Water Quality Technical Report I Page 34 pollutants. Some pollutants such as heavy metals, which are chemically bound to organic particles in the mulch, are released over time as the organic matter decomposes to release the metals to the feeder roots of the plants and the cells of the bacteria in the soil where they remain and are recycled. Other pollutants such as phosphorus are chemically bound to the soil particles and released slowly back to the plants and bacteria and used on their metabolic processes. Than we can resume that the Filterra Bioretention System-High Performance Media is capable to treat the primary pollutants of concern for this development as shown on the pollutants removal table on Appendix 7 under "Bioretention Unit Removal Process" and mentioned on the Filterra Bioretention System-High Performance Media product information and description. Therefore this Filterra Bioretention System-High Performance Media structure is adequate and is being proposed on this project, since is similar to a natural bioretention system that is not feasible to introduce due to the existing project condition. Project development will proposed two 6 x 10 unit, each one treats max 0.82 acres to add a total treated area of]. 64 acres, which is more than the 1.56 acres total disturbed area. 1 I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report I Page 35 K&S ENGINEERING, INC. I I' L] 19.0 Projected Storm Water BMP Maintenance Mechanism Maintenance Mechanism Conditional Use Permit - For discretionary projects only, the City may assure maintenance of storm water BMPs through the inclusion of maintenance conditions in the conditional use permit. A non- refundable security may be required. Project Proponent Agreement to Maintain Storm Water BMPs - The City may enter into a contract with the project proponent obliging the project proponent to maintain, repair and replace the storm water BMP as necessary into perpetuity. A non-refundable security may be required. LI Lease Provision - In those cases where the City holds title to the land in question and the land is being leased to another party for private or public use, the City may assure storm water BMP maintenance, repair and replacement through conditions in the lease. LI Assessment District - The City may approve an Assessment District or other funding mechanism created by the project proponent to provide funds for storm water BMP maintenance, repair and replacement on an ongoing basis. Any agreement with such a District shall be subject to the Public Entity Maintenance Provisions below. Public Entity Maintenance - The City may approve a public or acceptable quasi-public entity (e.g., the County Flood Control District, or annex to an existing assessment district, an existing utility district, a state or federal resource agency, or a conservation conservancy) to assume responsibility for maintenance, repair and replacement of the BMP. Public entity maintenance agreements shall ensure estimated costs and front-funded or reliably guaranteed, (e.g., through a trust fund, assessment district, fees, bond, letter of credit or similar means). In addition, the City may seek protection from liability by appropriate releases and indemnities. The City Engineer shall have the authority to approve storm water BMPs proposed for transfer to any other public entity within its jurisdiction before installation. The City shall be involved in the negotiation of maintenance requirements with any other public entities accepting maintenance responsibilities within their respective jurisdictions; and in negotiations with the resource agencies responsible for issuing permits for the construction and/or maintenance of the facilities. The City must be identified as a third party beneficiary empowered to enforce any such maintenance agreement within their respective jurisdictions. El Alternative Mechanism - The City may accept an alternative maintenance mechanism if such mechanism is as protective as those listed above. An alternative mechanism must be approved by the City Attorney and the City Engineer. Comment: 1.1 Facility Ownership & Maintenance Agreements The following individual(s)/organization will own the facilities, including all structural and non-structural BMPs, and are responsible for maintenance in perpetuity: CR SEA OTTER, LLC 5909 Sea Otter Place Carlsbad, CA 1.1.1 Potential Permanent BMP Maintenance Mechanisms Storm water agreement. I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report I Page 36 K&S ENGINEERING, INC. 1.2 Operations, Maintenance and Inspection See appendix 7 for all maintenance requirements. 1.2.1 Typical Maintenance Requirements Inspection Schedule: See appendix 7 for all maintenance requirements. 1.2 Project BMP Verification The Engineer of Record and/or the City Engineer must verify through inspection of the site that the BMPs have been constructed and implemented as proposed in the approved WQTR. The inspection must be conducted and City approval must be obtained prior to issuing a Notice of Completion on the project. 1.2.1 Annual BMP Operation and Maintenance Verification See appendix 7 for all maintenance requirements. TWIN ATLAS BULDING SEPARATION (Permit Application Number, K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 37 20.0 Summary and Conclusion Narrative The Project has incorporated specific site design characteristics to provide a minimum' of impervious areas on the site. The maximum number of compact car parking spaces allowed by code reduces the pavement areas in surface parking areas as well as payers on walkway paths. The landscaped areas provide an efficient use of permeable areas. Roof drainage flows are directed into landscaped areas adjacent to and sloping away from building structures. Installation and monitoring of the irrigation system for these landscape areas will reduce over-irrigation, thereby reducing the oversaturation of the area's leading to excess runoff. The conservation preserves native trees and shrubs, lessening the impact of this development on the surrounding area. The landscaped areas of the site will utilize native or drought tolerant species in the planting scheme. All storm flows will exit the site in the same locations as in the existing condition. There will be no increase in post-development peak flow. 11 ~ I TWIN ATLAS BULDING SEPARATION (Permit Application Number, Priority Development Water Quality Technical Report Page 38 K&S ENGINEERING, INC. References TWIN ATLAS BULDING SEPARATION (Permit Application Number, ) K&S ENGINEERING, INC. Priority Development Water Quality Technical Report Page 39 I U 1. Vicinity Map I I U U U H I 'H II I I I I 2. Soil Type Exhibit I Li I] I] I I I I I I I I] I I I I e1I 3. Federal Emergency Management Agency (FEMA) Map I I 4. Storm Water Quality Checklist and Certification STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov -. 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 (BMP's) into the project design per the City's Standard Urban Storniwater Management Plan (SUSMP). To view the SUSMP, refer to the Engineering Standards (Volume 4, Chapter 2). I Initially 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 I 'Standard Stormwater Requirements' or be subject to additional criteria called Priority Development Project Requirements'. Many aspects of project site design are dependent upon the storm water standards applied to a project. Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has I 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 separate completed and signed questionnaire must be submitted for each new development application submission. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently. In addition to this questionnaire, you must also complete, sign and submit a Project Threat Assessment Form with construction permits for the project Please start by completing Step I and follow the instructions. When completed, sign the form at the end and submit this with your application to the city. 1 .,. . ........... . . . - TO BE COMPLETED FOR ALL PROJECTS ' . ..-... To determine if your project is a priority development project, please answer the following questions: YES NO Is your project LIMITED TO constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria: (1) Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non-erodible permeable areas; OR (2) designed and constructed to be hydraulically disconnected from V paved streets or roads; OR (3) designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets guidance? Is your project LIMITED TO retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in accordance Green _with _the _USEPA_ _Streets _guidance? If you answered 'yes" to one or more of the above questions, then your project is NOT a priority development project and therefore is NOT subject to the storm water criteria required for priority development projects. Go to step 4, mark the last box stating "my project does not meet PDP requirements" and complete applicant information. If you answered 'no" to both questions, then go to Step 2. E-34 Pagel of 3 Effective 6/27/13 STORM WATER STANDARDS Development Services Land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov - . TO BE COPLETEO FOR L NW OR RE-DVELQPMENT QJECTh - To determine if your project is a priority development project, please answer the following questions: YES NO 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 V development projects on public or private land. Is your project creating 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, V industrial, residential, mixed-use, and public development projects on public or private land. 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 restaurant? A restaurant is a facility that sells prepared V foods and drinks for consumption, including stationary lunch counters and refreshment stands selling prepared foods and drinks for immediate consumption. 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. 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 parking lot. A parking lot is a land area or facility for the V temporary parking or storage of motor vehicles used personally for business or for commerce. 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 street, road, highway freeway or driveway? A street, road, highway, freeway or driveway is any paved impervious surface used for the transportation of V automobiles, trucks, motorcycles, and other vehicles. Is your project a new or redevelopment project that creates 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 commingles _with _flows _from _adjacent lands).* Is your project a new development 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, V 5014, 5541, 7532-7534, or 7536-7539. Is your project a new development 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 V 100 or more vehicles per day. 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? V ills 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%? If you answered "yes" to one or more of the above questions, you ARE a priority development project and are therefore subject to implementing structural Best Management Practices (BMP's) in addition to implementing Standard Storm Water Requirements such as source control and low impact development BMP's. A Storm Water Management Plan (SWMP) must be submitted with your application(s) for development. Go to step 3 for redevelopment projects. For new projects, go to step 4 at the end of this questionnaire, check the "my project meets PDP requirements" box and complete applicant information. If you answered "no" to all of the above questions, you ARE NOT a priority development project and are therefore subject to implementing only Standard Storm Water Requirements such as source control and low impact development BMP's required for all development projects. A Storm Water Management Plan (SWMP) is not required with your application(s) for development. Go to step 4 at the end of this questionnaire, check the "my project does not meet PDP requirements" box and complete applicant information. E-34 Page 2 of 3 Effective 6127113 STORM WATER STANDARDS QUESTIONNAIRE E-34 Development Services Land Development Engineering 1635 Faraday Avenue 760-602-2750 www.carlsbadca.gov :. .•. STEP.3 .-. - .:•• . TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPEMENT PROJECTS ONLY Complete the questions below regarding your redevelopment project: 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? It you answered 'yes,' the structural EMP's required for Priority Development Projects apply only to the creation or replacement of impervious surface and not the entire development. Go to step 4, check the "my project meets POP requirements" box and complete applicant information. If you answered "no," the structural BMP's required for Priority Development Projects apply to the entire development. Go to step 4, check the "my project meets POP requirements" box and complete applicant information. - . . •.. . STEP4 I -• --'---- - CHECK.THE APPROPRIATE BOX AND COMPLETE APPLICANT IUFORfATiON My project meets PRIORITY DEVELOPMENT PROJECT (POP) requirements and must comply with additional stormwater criteria per the SUSMP and I understand I must prepare a Storm Water Management Plan for submittal at time of application. I understand flow control (hydromodification) requirements may apply to my project. Refer to SUSMP for details. My project does not meet POP requirements and must only comply with STANDARD STORMWATER REQUIREMENTS per the SUSMP. As part of these requirements, I will incorporate low impact development strategies throughout my project. Applicant Information and Signature Box Address: 5909 SEA OTTER PLACE Accessor's Parcel Number(s): 209-082-09-00 Applicant Name: KAMAL S SWEIS - Applicant Title: AGENT Applicant Signature: Date: 6/29/2015 This Box for City Use Only City Concurrence: YES NO By: Date: Project ID: 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 quivalent under the Multi Species Conservation Program within the Cities and County of San Diego; and any other equivalent environmentally sensitive areas which have been identified by the Coperrnittees. E-34 Page 3 of 3 Effective 6/27113 5. Geotechnical Study reference (NOT AVAILABLE AT THIS TIME) Fi I 6. HMP Calculations (NOT REQUIRED) 7. Proprietary BMP Manufacturer Information and Specifications I I I I I I II Ii I II I I I I I I I I - - - - - - - - - - - - - - - - - - I.M.P. AREAS CALCULATION FILTERRA FACILITY (FOR WATER QUALITY ONLY) Project Name: Sea Otter Renovations Date: 7/16/2015 Project Location: 5909 Sea Otter Place, Carlsbad CA APN: 209-082-09-00 K & S Project No: 14-014 Basin I DMA DMA Post-Proiect DMA DMA area X Soil Tvne IMP Name Surface Runoff Runoff NAME Area (SF) type Factor Factor 'D" 7- Filterra Facility No I A.C. Paving 26,255 A.C. Paving 1.0 26,255 Concrete 6,997 Concrete 1.0 6,997 Roof - Roof 1.0 - Pervious 34,778 Landscape 0.1 3,478 68,030 Total (SF) 36,730 I 1.56 Ac 1Total (Acres) 0.84 1 Since the Payers area will need to have an underground drainage system and will not be LID complaint The project is proposing to install two 6'x 10' Filterra Units that will treat the total disturbed area. (see filterra information) S fin Itefra Bioretention Systems Table 1: Filterra® Quick Sizing Table (Western Zone - 0.2 in/hr Uniform Intensity Approach) Available Filterra® Box Sizes Recommended Commercial (feet) Contributing Drainage Area Outlet Pipe (acres) where C = 0.85 4x6.5 or 6.5x4 up to 0.35 4" SDR-35 PVC 4x8 or 8x4 0.36 to 0.44 4" SDR-35 PVC Standard 6x6 0.45 to 0.49 , 4" SDR-35 PVC 6x8 or 8x6 0.50 to .65 4" SDR-35 PVC 6x10 or 10x6 0.66 to 0.82 6" SDR-35 PVC 6x12 or 12x6 0.83 to 0.98, 6" SDR-35 PVC Available Filterra® Box Sizes (feet) Recommended Residential Contributing Drainage Area (acres) where C = 0.50 Outlet Pipe 4x6.5 or 6.5x4 up to 0.60 4" SDR-35 PVC 48 or 8x4 0.61 to 0.74 4" SDR-35 PVC Standard 6x6 0.75 to 0.83 4" SDR-35 PVC 6x8 or 8x6 0.84 to 1.11 4" SDR-35 PVC 6x10 or 10x6 1.12 to 1.39 6" SDR-35 PVC 6x12 or 12x6 1.40 to 1.67 6" SDR-35 PVC Notes: All boxes are a standard 3.5 feet depth (INV to TC) A standard SDR-35 PVC pipe coupling is cast into the wall for easy connection to discharge drain Dimensions shown are internal. Please add 1' to each external (using 6" walls) In line with 1R55 data, for Commercial Developments a minimum (runoff coefficient) C factor of 0.85 is recommended. For Residential Developments, use of C factors less than 0.5 require individual site review by Filterra. Please ask for Sizing Tables for other target treatment goals, e.g. 0.3 in/hr This sizing table is valid only for CA, NV, AZ, OR, ID, AK & HI 2/5/08 www.filterra.com C *NTECH ENGINEERED SOLUTIONS L FilterraO ('T I iiFiri A New Standard of Performance in Stormwater Qualty Treatment www.ContechES.com 800-338-1122 //1- C -,\\ '1NTECH® ENGINEERED SOLUTIONS Filterra® High-Performance Media The "active ingredient" in the high performance of Filterra products, either within the familiar precast box or in the Filterra BoxlessTM design, is the Filterra media. Otherwise known as "planting soil" for bioretention stormwater BMPs, Filterra media is specifically engineered for markedly high hydraulic conductivity while maintaining typical bioretention removal rates on a variety of stormwater pollutants. Filterra Boxless Installation - Ashland, VA Design Basis ... The Origins of Filterra I I Scientifically designed with help from University of Virginia's Civil Engineering Department, the foundation of Filterra media is high-flow rapid sand filters used by water and waste water treatment plants for decades. The product platform of high-flow radial sand filters was modified with the addition of organics, mulch and plantings p to combine the hydraulic capacity of those sand filters with the regenerative pollutant removal capability of standard bioretention designs. Ii II II II II I' 11 Rapid Sand Filter (typical) II CNTECH® ENGINEERED SOLUTIONS I Performance Attributes ... Compact Size Yet Full-Scale Pollutant Removal As a result, the unique, proprietary design of Filterra yields hydraulic conductivity an order of magnitude higher I than traditional, public-domain bioretention planting soils - 140"/hour versus about 3"-25"Ihour (Table 1). This high media flowrate allows Filterra products, in either box or boxless design, to be sized as small as 1/1 0th that of standard bioretention cells. As important, Filterra media's pollutant removal performance (demonstrated by effluent concentration) is comparable to or better than traditional bioretention systems - see Figure 1 which contrasts International BMP Database values against Filterra TARP study results. TABLE 1: Filterra vs. Public-Domain Bioretention Designs Standard Bio* Filterra Components 3" Mulch v v Media Depth 2.5-4 2 Under drain v v Plants N/A 4 plants/acre Media Tests _______ _______________ pH v v Organic Matter v' v Fertility v' v Soluble Salts V* v PSD V* v CEC X v Porosity X v Bulk Density X v Particle Shape X v % Silt/Clay X v % Fiber/Lignin X v Soil Repiration X v Microscopy X v Hydraulic Performance X v Water Quality Performance X v Removal Mechanisms v v Infiltration Rate 1.5-2.6 in/hour 140 in/hour *Ohio Dept. of Natural Resources Rainwater and Land Development Manual (May 2012) C-,\\ I //I- %ow-NTECHO ENGINEERED SOLUTIONS Figure 1: Filterra compared to Standard Bioretention for TSS and TP Filterra TSS Effluent Concentration vs. Standard Bioretention C) E 3o -I- 1: 15 0 10 - c5 LIZ 0 t Filterra Standard Bioretention* Filterra Total Phosphorus Effluent Concentration vs. Standard Bioretention 0.5 C) E 0.4 .2 4-. 20 U..) a, U 0 Filterra Standard Bioretention* II Peace-of-Mind Media Performance ... Before and After Installation I The stormwater designer can be confident that use of Filterra media in his/her bioretention plan will yield the same high performance as tested in numerous rigorous field and pilot tests such as TAPE in Washington state, TARP in Virginia, and NJCAT in New Jersey. The Filterra 'media certification (see Figure 2) warrants this high I I performance as delivered to the jobsite in one-ton supersacks. Such certification is based on high standards of quality control in Filterra media raw materials and media composition, and use of strict quality assurance methods in the manufacturing process, cross-checked with over a dozen characterization, composition and I i performance tests conducted on each production run. Such techniques are rarely employed in the on-job- site production of "planting soils" routinely used in traditional, public-domain bioretention designs. Finally, the Filterra As-Built lnfiltrometer (see Figure 3) was developed specifically for Filterra BoxlessTM applications to I I verify, post-construction, that the Filterra media was not (or was) compromised during the construction of the bioretention system. This test is simple, low-cost and can be conducted by the contractor's construction crews, engineering survey teams or landscape contractors. It is a "go" / "no go" flow test of the entire profile of the Filterra media depth, and typically takes about 30 minutes to conduct. CO N T E C H® ENGINEERED SOLUTIONS Hydraulic QAIQC Lab Testing filteria F,rSio.tndon Systom Rerd, Z D.vopn,ffl Modis Q,,DtyCo,,1ro meóoqaIy Qtd uv MId,&VA23UJ5 Eil:diFiI!!- Figure 2: Filterra Media Certificate Figure 3: Filterra As-Built Infiltrometer Test Sustainable Design ... Ensuring High Performance Over its' Life-Cycle The compact size of Filterra, either in box or boxless format, provides yet another critical differentiation against traditional bioretention systems. The small size of Filterra, or conversely the relatively larger drainage area compared to standard bioretention systems (about ten times larger) delivers about ten times the amount of stormwater and related nutrients (pollutants such as phosphorus and nitrogen compounds) to the plants in the Filterra. Such nourishment of the Filterra plants grows the plant biomass within the media (see Figure 4), which in turn maintains the media high hydraulic conductivity by countering media compaction and Opening new flow pathways along the extended root mass. This biomass growth increases the media sorption capacity for pollutant retention during storm events. Mulch layer degradation additionally adds organic mass to the media, replacing organic components within the media that degrade and/or are washed away during the storm. As a result, the compactness of Filterra contributes to sustainability of its' pollutant removal rate in terms of sorptive capacity and in treatment flowrate. Further, Filterra media also provides high levels of treatment volume relatively irrespective of any significant reduction in the Filterra media flowrate. As shown in Figure 5, a reduction in Filterra media flowrate of 50% (from design value of 140"/hour to 70"/hour) reduces the annual capture efficiency, or amount of stormwater runoff treated as a percentage of total runoff, only about 7 percentage points, from 90% to 83%. Commerical Filterra units have been field-tested in our long-term performance studies to show almost NO appreciable reduction in flowrate despite maintenance not being performed for 1 1/2 to 2 years. I I I I I I I I Filterra 11 I I 100% 90% >, U C 70% 60% 50% . 40% C 41 30% 20% 10% 0% 40 50 60 70 80 90 100 110 120 130 140 150 160 170 Media Flowrate , inlhr i 1iargt H 1111111111 C -Ck' I N T E C H® ENGINEERED SOLUTIONS Figure 4 Figure 5: Estimated Treatment Volume of Stormwater vs. Filterra Flowrates Plant metabolism Plant uptake in the rhizosphere Root absorbtuon4Vk / . . . Contaminants IlIL 50% reduction in flow lowers total annual treated volume by less than 10% Market-Proven ... Again and Again Filterra media has been extensively lab, pilot and field-tested with several well-known test programs including TARP, TAPE and NJCAT protocols, passing with flying colors. Filterra has been marketed for over a dozen I years across North America, with more than 5,500 installations in (32) states of the U.S., Canada and the United Kingdom. Filterra products are approved in some of the strictest stormwater quality jurisdictions including the states of Washington, Maryland and Virginia. Filterra approval spans the coasts of the U.S. enjoying approvals in Maine, Massachusetts, Oregon, and parts of the Carolinas and California. II C -,\\ ' I;NTECH® II ENGINEERED SOLUTIONS Want To Learn More About Filterra Media? I Sustainable System Design Compact size provides about 200 times the water flow to plant versus surrounding landscape plantings, promoting rigorous root and biomass growth I .Bioretention media can exhibit more dramatic expansion and contraction during hydration and dehydration processes. In comparison to rigid sand filter media, bioretention media is relatively plastic, allowing for media shape adjustments to incorporate captured particles and improve the infiltration I capacity during the dry period. Vegetation Plant root biomass growth maintains and enhances media high hydraulic conductivity by reducing I compaction. Root growth aids in the development of healthy and biologically-active soil structures and can increase infiltration rates over time due to the creation of macropores in the media. Plant roots also contract and expand depending on water availability which helps to develop preferential flow pathways. I .Plant shoot biomass growth increases pollutant removal over time. Organic and inorganic constituents are removed from stormwater by plants and microorganisms via biological uptake and sequestration. Biological uptake results in the conversion of nutrients in stormwater into living tissue, while I bioaccumulation results in the sequestering of pollutants into the plant regardless of what is immediately needed (aka luxury feeding). Microbial Biomass Microbial biomass growth maintains and enhances media high hydraulic conductivity by media aggregation from fungal slime. Fungi also contain individual fungal filaments known as hyphae, which I together form mycelia and aid in soil structure stabilization. Worms aid in the development of natural soil structure, and their cavities and castings help with soil aggregation as well as pollutant removal. I .Microbial biomass growth sustains pollutant removal performance by regenerating the sorption capacity of the media. Microbially-mediated transformations such as xenobiotic metabolism or alteration of pH and redox I potential within the soil can play a significant role in the transformation, stabilization, and detoxification of heavy metals and organic chemicals, or convert various pollutants into a form that can be accumulated or adsorbed by plants and microbes. I Mulch Mulch layer supports microbial biomass growth by retaining moisture within the media and providing a food source. I .Mulch layer pretreats high flow media layer, protecting media clogging from heavy sediment loadings. Natural decomposition of mulch layer recharges organic content in media, maintaining cation exchange capacity for pollutant adsorption. II II II 11 Fungal Hyphae Ciliate (Protozoa) Rotifer I I CNTECH® I ENGINEERED SOLUTIONS Bioretention Systems are Mother Nature's "Stormwater Treatment Train" with (8) unit treatment processes within one system. See Figure 6 below. I ion U-nit-Rernovai-P-r-o-c-e-s-s-e"s Pollutant Removal Unit Removal Processes Potentially Provided by Bioretention Systems Particulates & Particulate- Diss. Metals Diss. Nitrogen bound Diss. Phosphorus _______ tia _______ Oil & Grease VOCs & SVOCs Inert Filtration 4 o o o 4 o Reactive Filtration o 4 1!.J o Microbially-mediated Transformations a a o a 0 0 0 Biological Uptake and Storage o a a a a a 0 Volatilization o o a 0 0 0 0 Bacterial Inactivation Processes 0 0 0 0 0 0 4 Soil Processes o a a a a a a Routine Maintenance a a a a 0 0 *Geosy,.tec Consultants, Hen-era Environmental Consultants. 2010. Fl/terra Bioretention Systems: Technical Basis for High Flow Rate Treatment and Evaluation of Stormwater Quality Performance. yremovali mechanism in bioretention syste + Generally limited removal mechanism in bioretention systems unless specific design attributes are included Supporting process in well drained bioretention systems I Process with no Contribution or unknown contribution to pollutant removal - Filterra As-Built Infiltrometer: Post-Construction Verification of Media ' Performance (See Figure 6) Extensive testing: A custom high flow rate infiltrometer has been developed by the Filterra Research & Development Department with ' pass/ fail criteria based on 500+ lab quality control flow rate data and 100+ field flow data. Conservative: Measures entire media profile depth under saturated I conditions. Versatile: Useful during initial verification of design spec and also quantifies maintenance need. Could be adopted for predictive I maintenance program. Adaptable to both slow and high flow rate media as well as different media profile depths. Figure 6: Filterra As-Built lnfiltrometer Operation& Maintenance (0m) Manual vOl : ~ OW I filterra® Bioretention Systems Table of Contents Overview Filterra® General Description Filterro® Schematic Basic Operations Design Maintenance Maintenance Overview Why Maintain? > When to Maintain? Exclusion of Services Maintenance Visit Summary Maintenance Tools, Safety Equipment and Supplies Maintenance Visit Procedure Maintenance Checklist C ONTECH ENGINEERED SOLUTIONS www.ContechES.com/filterra 1 800-338-1122 General Description I The following general specifications describe the general operations and maintenance requirements for the Contech Engineered Solutions LLC stormwater bioretention filtration system, the Filterra®. The system utilizes physical, chemical and biological mechanisms of a soil, plant and microbe complex to remove pollutants typically found in urban stormwater I runoff. The treatment system is a fully equipped, pre-constructed drop-in place unit designed for applications in the urban landscape to treat contaminated runoff. Stormwater flows through a specially designed filter media mixture contained in a landscaped concrete container. The mixture immobilizes pollutants which are then decomposed, volatilized and incorporated into the biomass of the Filterra® system's micro/macro fauna and flora. Stormwater runoff flows through the media and into an underdrain system at the bottom of the container, where the treated water is discharged. Higher flows bypass the Filterra® to a downstream inlet or outfall. Maintenance is a simple, inexpensive and safe operation that does not require confined space access, pumping or vacuum equipment or specialized tools. Properly trained landscape personnel can effectively maintain Filterra® Stormwater systems by following instructions in this manual. www.ContechES.com/filterra 1 800-338-1122 tasic Operations ilterra® is a bioretention system in a concrete box. ontaminated stormwater runoff enters the filter box through the curb inlet spreading over the 3-inch layer of mulch on the t rface of the filter media. As the water passes through the ulch layer, most of the larger sediment particles and heavy metals are removed through sedimentation and chemical t f I actions with the organic material in the mulch. Water passes rough the soil media where the finer particles are removed and other chemical reactions take place to immobilize and a pture pollutants in the soilmedia. The cleansed water sses into an underdrain and flaws to a pipe system or other appropriate discharge point. Once the pollutants are e the soil, the bacterlo begin to break down and metabolize e materials and the plants begin to uptake and metabolize pollutants. Some pollutants such as heavy metals, which are chemically bound to organic particles in the mulch, are I eleased over time as the organic matter decomposes to elease the metals to the feeder roots of the plants and the cells of the bacteria in the soil where they remain and are lecycled. Other pollutants such as phosphorus are chemically ound to the soil particles and released slowly back to the plants and bacteria and used in their metabolic processes. titrogen goes through a very complex variety of biochemical rocesses where if can ultimately end up in the plant/bacteria biomass, turned to nitrogen gas or dissolves back into the Water column as nitrates depending on soil temperature, pH nd the availability of oxygen. The pollutants ultimately are retained in the mulch, soil and biomass with some passing out + the system into the air or back into the water. esign and Installation I ach project presents different scopes for the use of ilterra® systems. To ensure the safe and specified function of the stormwater BMP, Contech reviews each application .before supply. Information and help may be provided to he design engineer during the planning process. Correct ilterra® box sizing (by rainfall region) is essential to predict ollutant removal rates for a given area. The engineer shall ubmit calculations for approval by the local jurisdiction. he contractor is responsible for the correct installation of Filterra units as shown in approved plans. A comprehensive Installation manual is available at www.conteches.com. Maintenance Ihy Maintain? I All stormwater treatment systems require maintenance for ifective operation. This necessity is often incorporated in our property's permitting process as a legally binding BMP maintenance agreement. I . Avoid legal challenges from your jurisdiction's maintenance enforcement program. Prolong the expected lifespan of your Filterra media. I Avoid more costly media replacement. Help reduce pollutant loads leaving your property. Simple maintenance of the Filterra® is required to continue effective pollutant removal from stormwater runoff before discharge into downstream waters. This procedure will also extend the longevity of the living biofilter system. The unit will recycle and accumulate pollutants within the biomass, but is also subjected to other materials entering the throat. This may include trash, silt and leaves etc. which will be contained within the void below the top grate and above the mulch layer. Too much silt may inhibit the Filierro's® flow rate, which is the reason for site stabilization before activation. Regular replacement of the mulch stops accumulation of such sediment. When to Maintain? Contech includes a 1 -year maintenance plan with each system purchase. Annual included maintenance consists of a maximum of two (2) scheduled visits. Additional maintenance may be necessary depending on sediment and trash loading (by Owner or at additional cost). The start of the maintenance plan begins when the system is activated for full operation. Full operation is defined as the unit installed, curb and gutter and transitions in place and activation (by Supplier) when mulch and plant are added and temporary throat protection removed. Activation cannot be carried out until the site is fully stabilized (full landscaping, grass cover, final paving and street sweeping completed). Maintenance visits are scheduled seasonally; the spring visit aims to clean up after winter loads including salts and sands while the fall visit helps the system by removing excessive leaf litter. It has been found that in regions which receive between 30-50 inches of annual rainfall, (2) two visits are generally required; regions with less rainfall often only require (1) one visit per annum. Varying land uses can affect maintenance frequency; e.g. some fast food restaurants require more frequent trash removal. Contributing drainage areas which are subject to new development wherein the recommended erosion and sediment control measures have not been implemented may require additional maintenance visits. Some sites may be subjected to extreme sediment or trash loads, requiring more frequent maintenance visits. This is the reason for detailed notes of maintenance actions per unit, helping the Supplier and Owner predict future maintenance frequencies, reflecting individual site conditions. Owners must promptly notify the (maintenance) Supplier of any damage to the plant(s), which constitute(s) an integral part of the biorefention technology. Owners should also advise other landscape or maintenance contractors to leave all maintenance to the Supplier (i.e. no pruning or fertilizing). www.ContechES.com/filterra 1 800-338-1122 I Exclusion of Services I It is the responsibility of the owner to provide adequate irrigation when necessary to the plant of the Filterra® system. Clean up due to major contamination such as oils, chemicals, toxic spills, etc. will result in additional costs and are not covered under the Supplier maintenance contract. Should a major contamination event occur the Owner must block off the outlet pipe of the Filterra® (where the cleaned runoff drains to, such as drop inlet) and block off the throat of the Filterra®. The Supplier should be informed immediately. I Maintenance Visit Summary Each maintenance visit consists of the following simple tasks (detailed instructions below). Inspection of Filferra® and surrounding area Removal of tree grate and erosion control stones Removal of debris, trash and mulch Mulch replacement Plant health evaluation and pruning or replacement as necessary Clean area around Filterra® Complete paperwork Maintenance Tools, Safety Equipment and Supplies Ideal tools include: camera, bucket, shovel, broom, pruners, hoe/rake, and tape measure. Appropriate Personal Protective Equipment (PPE) should be used in accordance with local or company procedures. This may include impervious gloves where the type of trash is unknown, high visibility clothing and barricades when working in close proximity to traffic and also safety hats and shoes. A T-Bar or crowbar should be used for moving the tree grates (up to 170 lbs ea.). Most visits require minor trash removal and a full replacement of mulch. See below for actual number of bagged mulch that is required in each unit size. Mulch should be a double shredded, hardwood variety; do not use colored or dyed mulch. Some visits may require additional Filterra® engineered soil media available from the Supplier. Box 'Length a Box Width A 'Filter Surface Volume at 3" # of 2 ft3 Mulh Area ({i2) •(ft3) Bags A S • 4: I. • A!I www.ContechES.com/filterra 1 800-338-1122 I Maintenance Visit Procedure Keep sufficient documentation of maintenance actions to predict location specific maintenance frequencies and needs. An example Maintenance Report is included in this manual. 1. Inspection of Filterra® and surrounding area Record individual unit before maintenance with photograph (numbered). Record on Maintenance Report (see example in this document) the following: Recoi-d on Maintena rice Report the foIowtng: StcndkgWatér ., yes no. Darnaçe to ox Simture no Damage td Gate : yes -1 no 1 s Bypass CIea yes no yes answered to 0ry of thesi observafins, record wih close up photograph (numbered) 2. Removal of tree grate and erosion control stones Remove cast iron grates for access into Filterra® box. Dig out silt (if any) and mulch and remove trash & foreign items. 4Recordon Manten:nce eport the foowing Silt/Ckiy 'ye's no yes'Ino Leaves •, 'ys no # 0+ BucketseRernoveds - -- .- 3. Removal of debris, trash and mulch After removal of mulch and debris, measure distance from the top of the Filterra® engineered media soil to the bottom of the top slab. If this distance is greater than 12", add Filterra® media (not top soil or other) to recharge to a 9" distance Record on Wointenance Report the fcUowig Distance of Boffornf Top Slob (inches) .#.of Brckets f Media Added www.ContechES.com/filterra 1 800-338-1122 I 4. Mulch replacement Please see mulch specifications. Add double shredded mulch evenly across the entire unit to a depth of 3". Ensure correct repositioning of erosion control stones by the Filterra® inlet to allow for entry of trash during a storm event. Replace Filferra® grates correctly using appropriate lifting or moving tools, taking care not to damage the plant. Plant health evaluation and pruning or replacement as necessary Examine the plant's health and replace if dead. rr urie UZI r i esur y 10 Ci IL0U uye yl owir I III 111t i..ur ICLI OIl C(.II : Record on Maintenance Report the following: Height above Grate Width at Widest Point Health : . oliv deod- Damage to Plant yes I.ho A4 r Plant R*ploced yes no Clean area around Filterra® Clean area around unit and remove all refuse to be disposed of appropriately. 7. Complete paperwork Deliver Maintenance Report and photographs to appropriate location (normally Contech during maintenance contract period). Some jurisdictions may require submission of maintenance reports in accordance with approvals. It is the responsibility of the Owner to comply with local regulations. www.ContechES.com/filterra 1 800-338-1122 Maintenance Checklist System Froblem 'Conditions,to iCheck Condition that Should Exist Actions re Inlet should be free of Excessive Accumulated sediments obstructions allowing free Sediments and/or trash o Inlet sediment or trash or trash impair free flow distributed flow of water should be removed. accumulation. of water into Filterra. into Filferra. Trash and debris should Trash and Excessive trash and/or Minimal trash or other be removed and mulch Mulch Cover floatable debris debris accumulation, debris on mulch cover. cover raked level. Ensure accumulation, bark nugget mulch is not used. "Ponding" in unit could Recommend contact "Ponding" of be indicative of clogging Stormwater should drain manufacturer and Mulch Cover water on mulch due to excessive fine freely and evenly through replace mulch as a cover, sediment accumulation mulch cover. or spill of petroleum oils. minimum. Soil/mulch too wet, Plants not evidence of spill. Plants should be healthy Contact manufacturer Vegetation growing or in Incorrect plant selection, and pest free. for advice. poor condition. Pest infestation. Vandalism to plants. Plants should be Trim/prune plants in Plant growth appropriate to the accordance with typical Vegetation excessive, species and location of landscaping and safety Filterra. needs. Cracks wider than 1/2 inch or evidence of soil Structure Structure has particles entering the Vault should be repaired. visible cracks. structure through the cracks. MoinJenahce is ideally Jo be performed twice annually.. . V V •V VI C i ;NTECH ENGINEERED SOLUTIONS I © 2015 Contech Engineered Solutions LLC Revised 6/22/2015 www.ConfechES.com/filferra 1 800-338-1122 - - I - .Stf-IK 174, - Wp RaWl, %W? - - -- rr 'f;• - -:' •-• •1.. •: • :'' 't- - çzj -2 . -. - •- -:: ;:-:_' -c . I .\ ..;'- -:Y' - L iA - •'•- i"-; .- - --PA,..- -.- p - t - .:?. •.--L "- r•;- :- 11 8. Construction Plan Set PVCL---------------------- -- CONNECT PERFORATED PIPE TO THE PROPOSED STORM DRAIN SYSTEM SECTION A - A NIX ES BUILDING 9080 490.80 EXBULDING 1%MIN. 1% MR. FFE4BO.B5 FFE49085 NEW IT OF CONCRETE VIEWII.FOONRETE(Typ) NEW LANDSCAPE AREA C LINER UNDER PAVER SECTION J NEW AVERS NEW STORM DRAIN SYSTEM SECTION B - B NTS TREEIPLANTAS REQUIRED TO BE INSTALLED ATACTPJATION 00 PAVED OR & LANDSCAPED SURFACE. STAINLESS STEEL NOSING OATH FILTERRA LOGO) ' FILTERRA UNTI' FACE OF CURB. 5 5 S S &W- STANDARD CURB I I LOCALAREA DEPRESSION OR FLUME PER LOCAL S AGENCY STANDARD STANDARD 4OW OPENING. NO DUMPING FOAM INSERT/DEBRISGUARD PLACARD, (NOT SHOWN IN THIS VIEWI - TORE REMOVES ATACTWATION. - BASE MATERIAI,JBACKFILL AS REQUIRED. PAVEMENT SUR FACE, FILTERRA SECTION NTS FILTERRA 7 UNIT SLOPE T&G JOINT. SHIM FOR ADJUSTMENT TO SLOPE. 417 PERFORATED PIPE UNDERDRAIN PVC OUTLET COUPLER PROVIDED CAST SYSTEM BT KRISTAR. MONOLITHIC. INVERT AT 3.50-142.00-1 FROM TOP OF CURB ALL EXTERNAL PIPING & ANGLES BY OTHERS. 6'x 10 FILTERRA CROSS SECTION NTS SCALE ly CITY OF VISTA 99I05 CITY OF SITE .,LA SAN MARCOS PACIFIC OCEAN CITY OF OCEANSIDE CITY OF ENCINITAS " VICINITY MAP NOT TO ES. ±2 PIPE IPE DETAIL A NT. S. LEGEND DESCRIPTION STANDARD SYMBOL EXISTING DRAWING PROSECT BOUNDARY PARKING LIGHT - EXISTING ROOF DRAINS - RD EXISTING FIRE HYDRANT - [1)312 EXISTING VALVE - EXISTING METER/VAULT - EXISTING PVT. STORM GRAIN PIPE EXISTING FYI. 15" 0 15" INLETS - 0 PROPOSED NEW AC PAVEMENT - I NEW CURB (PVT) SDRSD C-I NEW CURB & GUTTER (PET) SERSD G-2 . NEW 30 DRIVEWAY 014 J NEW 6'X12' FILTERRA - NEW ROUND GRATES NDS OR EQUAL 0 -PART 13S FOR D.C. SURFACES W/ #200 SIEVE SCREEN -PART 923P8 FOR PAVING SURFACES -PART 75 & 60 FOR LANDSCAPE AREAS NEW 4" A 6" PVC PIPE SDR 35 PVC PIPE OR EQUAL - NEW 6" OPENING TRENCH DRAIN NDS DURA SLOPE DS-140 1111111 I 111111 YMTII A CRATE FOR LIGHT VEHICLE OR EQUAL & H.C. RECOMMENDED. NEW H.C. RAMP W/ RAIUNG - NEW WATER LATERAL (PVT) PER PLUMBING PLAN -IC- GRADING QUANTITIES CUT 100 CT FILL N/A CT EXPORT 100 CT IMPORT N/A CT REMEDIAL 100 CT NOTE: EARTHWORK QUANTITIES ARE ESTiMATED FOR PERMIT PURPOSES ONLY. (CALCULATED ON A THEORETICAL BASIS. ACTUAL QUANTITIES MAY VARY DUE TO SHRINKAGE OR SWELL FACTORS). SITE ADDRESS 5909 SEA OTTER PLACE CARLSBAD. CA 92008 APN 209-082-09-00 BMP DMA AREAS EA'ED CONDITION PERCENT PROPOSED CONDITION PERCENT IMPERVIOUS AREA (SF) 41,255 I 60.64 33,252 I 48.88 PERVIOUS AREA (SF) 26,775 39.36 34,778 51.12 TOTAL DISTURBED AREA (SF) 68,030 100 68,030 TOO REQUIRED TREATMENT CONTROL BMP TABLE TYPE DESCRIPTION OWNERSHIP MAINTENANCE QUANTITY FILTERRA UNIT HIGH PERFORMANCE 6' S 10' PRIVATE AS NEEDED MEDIA WDID NO. KsS ENGINEERING, INC.I P1RrDA/D.EMorig.SUrRo*lgI I7MI ikim Cd. Ct s.i. too s amCA 80I I 1(619) 296-5595 FoB (N19) 296-5564 I SEE C3 EXH00UTUOES /1 4 TO BE OCA1GD / .4/ 62 LJ 7.9..- 407/4410 409.OITC 41 .041C 0 / 7.60 .54 ~1-1 407.2 600TC LA HYDRANT 210 o:aoTc 06E PROTECTED 1 40764TC \ IN PLACE 000.50 0. •'h •_•__ 7.1 407, NEW LOCAIRN4 00 . I 46 5oicJ' lG. UJIUTES— 40743 EX. IRR. UGUfl - 0 -BE..RELOCA -.... •1- -.!--.-I •7xx /: c.UTIU NEW LOCATION EX, IRRIG. U11UTIES 406.7 1 i1LI; ol 411 DI \ \ Io" 0. (RN. UIIU1 TO 60 PROIEC IN PLACE N 00.0.0. INLET r io BE PROTECTED INPLA7 .42 EL UI1U(1E0 - /T I7 IN O 80PLACE PRO TC 406.BBTC 406.39 405.721C 405.72 /400. 1 /00662 - OX. 000 511 TER AND EX. WA 60100 - BE EVUA & TESTED ON CONTINUED USE OF THE EWSTN I BACKIFLOW P BUILDINU CR WILL BE REM0000.\ U. IN FIRE R.P.D.A. XE PRO10C CE 2 0.00. X SIN. 4+ 060 218- : LET SMK \ \ 406 TC 406 98TC 405'31L 406.921 C571) 104-42)7. EX. AlgrM 7 [7/ (405 70) ( 2STA 4+70 PER DWG# I54EET18 INSTALL A 2' METER THE 2* EXISTING 2RN 10J7 2 4+52 25) 405 505) T404 60) )63 2.50 2 [7 EX. TYPE 17IIIET TO BE PROIECItD IN PLACE -1T 0 10 20 40 60 GRAPHIC SCALE: 20 lOsS ENGINEERING, INC. I 11444449 . Ergnoor44 Sore44g I I ijn Cd. c ix s o xix I (619) 296-5565 F8 (619) 296-55641 I 40013 jz 77 poaj \_____ T 98ic _I- G4CjOTH I1 JIp-. I I I(407 71) I I L OX. UGUXE EI 0T9L A ON SHJ 1 407 60) 0 A I I i I I - (407.64) I'll) 0774, (408 081C (407 / . 47) EX. 16610. UT1U1IE / TO 660100100 / 408061C (40733) 000 PRRNOSED 6010 FEW POST-BlIP 6PV0020 - V CONCRETE N' I RE SOIL COMPACTION TESTING AS DIRECTED BY THE FIRE DEPARTMENT (TV?) 15' EASEMENT TO CMWD PER DOc#1991-0327621 DATED: JULY 53, 1991. CTING POOL CONCRETE AN 0 TO 20 40 60 GRAPHIC SCALE: 20 RD 410 EL DG.I050C BAD 9W P TO RE REMOVED -ER. GAS METER WILL BE EVALUATED At .NUED 040 RE TV OVED 0 OFESS/04, SHEET 11 CITY OF CARLSBAD SHEETS s, 4 3 BUILDING DIVISION 4 57 6 GRADING PLAN FOR: No. 48592" SEA OTTER SITE RENOVATIONS EXP A/SO/IS CIVIL 5909 SEA OTTER PLACE ØA' OF CARLSBAD, CALIFORNIA 92008 CVI.'9 KaS ENGINEERING, INC. I - . SogI I7101 mmm Cmdw cwt. sub IX S. (NAN CA 02108 1(819) 296-5565 Foo (619) 296-5564 I OWN BY Dill I PROJECT ND. I DRAWING NO. ICHKDBY_KSS CD- Ii C3 j Iaa I II SEE C4 - ....:: •:.... 6" PVC PIPE OO.6% .7016 7.461E .::.:.::: "'.'.'.•• 409.7015. - . .-.-.• --:-:- 407406 (PC I. PIPE 0 IX ( PVC PIPE 0 06% 407.62111 407.501E -(PVC PIPE0 0.6% 4" PVC PIPE 091X 407.8816 / ALONG I' C09404E1E ALONG _ THE BUILDING ON LANDSCAPE AREA THE BUILDING 094 ' (TYP)0 40980' LANDSCAPE AREA (TYP)0 40980' 409 7DTG. 400.TDE / - / 09 ( PVC PIPE U1% -6" PVC PIPE 00.6% 407.955 \ 409 65T0 409.7DTG. IE / ( PVC PIPE OT% - I IFFE=409.851 PVC PIPE 01% IFFE=409.851 9i_c_/, / 400.18E \ 6" PVC PIPE OD.N%- 409.7010 09 .. / -4" PVC PIPE 00.6% 408.571E / 409.6510 / 400.671E - / 4" PVC PIPE 0 0.6% (PVC PIPE 0 0.6%- / 408.735 4"PVICP1PEOO.6%-. - "-" PVC PIPE 00.6% 409.6510 ' / 400.7010 I' CTHID1EIE ALONG 405.841E NE BUILDING ON LANDSCAPE AREA I (l () 09 409.80 3 DRAINAGE LINE PER LANDSCAPE PLANS 4' PVC PIPE 0 0.6% RMATE LVC ABON RE APROVC I . ES P SC LINE PER PROJECT 409.7010 THE LATERAL SHEET C_I.WAL BE EVALUATED BUILDING CW0WLLBER090. 409.6516 / 4' PVC PIPE 0 0.6%CONTINUED 9E9BF -, 4" PVC PIPE 0 0.6% / ( PVC PIPE 006% - - 8 STING DOMESTIC WATER E PER QU40TA PONWNG EL 18090. UTILITIES ES fWRTECTED ,& 40488E / : PP• RAUNG N PLACE 16 $ 40965 ARE R.P.D.A. V 400.62 408.551E 403651 - P9 TO 30 0TEC I6PLACE 408.53881 RO B . 0 4084 . / " i7.iiIL.. I : f 0" 7&f5\ 40&DO 4TC 4 I - ... .........\ / ELW40LTOM SEE C2 NOTE: I. ALL EQUIPMENT / UTTUTTES WILL NEED TO BE TESTED P9108 TO REUSE. ALL 3 PLUMBING DEVISES WILL NEED TO BE REMOVED AND REPLACED UPDATING THEM TO CURRENT STANDARDS. PER FIRE DEPARTMENT RECCENOENDAI1ONS. 103 NEW COBBLE COVER FiRE ACCESS ROAD CONTRIJCI1CRA DETAILS SEE LANDSCAPE SHEET 24 SEE C3 joFESSio,, SHEET 1 CITY OF CARLSBAD II5, Ii BUILDING DIVISION GRADING PLAN FOR, 485) SEA OTTER SITE RENOVATIONS 5909 SEA OTTER PLACE CIVIL CARLSBAD, CALIFORNIA 92005 IJ K&S ENGINEERING, INC. rnng E9orng 7l MWM Cd. Cdt $. 100 S CA Vl (99) 296-5565 F S. 296-5594 I o BY DJM II PROJECT NO, I DT-N. NO. CHKD By _KSS l CD- C4 I flELD BY r 9. Reference Information I I I I I 1 I I I I I I 1 1 1 1 1 I I I SWMP NO. PARTY RESPONSIBLE FOR MAINTENANCE: NAME REGENT PROPERTIES ADDRESS11990 SAN NICENTE BLVD. CONTACT DEBRA AT1KEN SUITE 200 LOS ANGELES, CA 90049 PH0NENO.(0) 806-9804 PLAN PREPARED BY: NAME KAMAL S. SWEIS COMPANY K&S ENGINEERING SIGNATURE ADDRESS 7801 MISSION CENTER CT SUITE 100 SAN DIEGO, CA 92108 PHONENO. (619) 296-5565 BMP NOTES: CERTIFICATION THESE BMPSN1E MANDATORY TO BE INSTALLED PER MANUFACTURERS RECOMMENDATIONS OR THESE PLANS. NO CHANGES TO THE PROPOSED SNIPS ON THIS SHEET WITHOUT PRIOR APPROVAL. FROM THE CITY ENGINEER PlO SUBSTITUTIONS TO THE MATERIAL OR TAPES OR PLANTING TYPES WITHOUT PRIOR APPROVAl. FROM THE CITY ENGINEER. & NO OCCUPANCY WILL BE GNARlED UNTIL THE CITY INSPECTION STAFF HAS INSPECTED THIS PROJECT FOR APPROPRIATE NEW CONSTRUCTION AND INSTALLATION. REFER TO MAINTENANCE AGREEMENT DOCUMENT. SEE PROJECT SWMP FOR ADDITIONAL INFORMATION. ( BMP TABLE BMP ID III BMP TYPE SYMBOL CASQA NO. QUANTITY DRAWING NO. SHEET NO(S) INSPECTI * FREQUENCY ON MAINTENANCE * FREQUENCY TREATMENT CONTROL 'J F1LTERRA BIOREFENTION - Ek . 2 SEMIANNUALLY ANNUALLY HYDROMODIFICATION & TREATMENT CONTROL NOT APPUGABLE HYDROMODIFICATION NOT APPLICABLE] LOW IMPACT DESIGN (LID.) ".1 ROOF DRAIN TO LANDSCAPING • SD-lI 5 Bk . 2 ANNUALLY ANNUALLY SOURCE CONTROL \ DUSTING TRASH ENCLOSURE m ss-s I i EA. I 2 I ANNUALLY ANNUALLY STENCILS ou m m~ SD-IS 7 EA. 2 ANNUALLY ANNUALLY * CHOOSE FROM THE UST BELOW FOR COMPLETING THE FIELDS IN THE INSPECTIONS & MAINTENANCE FREAJQUENCY COLUMNS: ANNUAL SEMIANNUALLY QUARTERLY BIMONTHLY MONTHLY AS NEEDED NONE WEEKLY 1 TIME PER YEAR 2 TIMES PER YEAR 3 TIMES PEI YEAR 4 TIMES PER YEAR CITY OF CARLSBAD liS ENGINEERING DEPARTMENT — — — — — SINGLE SHEET BAIP SITE PLAN SEA OTTER SITE RENOVATIONS 5909 SEA OTTER PLACE CARLSBAD, CALIFORNIA 92008 RECORD COPY PROJECT NO. _______ I I DRAWiNG NO. INITIAL DATE II I - — — - _ I 1181 -. _ NA 1* S. 916 CAlEB 1(616) 29B-5565 Fox (NIB) 296-5564 I 1 K&S ENGINEERING, INC. I i TU . ORCANEER REViSION DESCRIP11ON DATE INITIAL DATE INITIAL ONCE API CITY APPROVAL