MODEL WATER QUALITY MANAGEMENT PLAN (MODEL WQMP) FOR THE CITY OF LAGUNA BEACH

Transcription

1 MODEL WATER QUALITY MANAGEMENT PLAN (MODEL WQMP) FOR THE CITY OF LAGUNA BEACH December 5, 2013

2 CONTENTS (all page numbers refer t pages within Exhibit 7.II f the Cunty wide DAMP and Sectin A.7 f the City f Laguna Beach Lcal Implementatin Plan) 7.II Mdel Water Quality Management Plan (WQMP) II 1.0 Intrductin II 1.1 Regulatry Basis II 1.2 Pririty Develpment Prject Categries II 1.3 Nn-Pririty Develpment Prjects II 1.4 Use f the Mdel WQMP, TGD, and WQMP Templates II 1.5 Public Agency Prjects II 1.6 WQMP Develpment Prcess II 2.0 Prject WQMP Requirements II 2.1 Discretinary Permit(s) and Water Quality Cnditins II 2.2 Prject Descriptin II 2.3 Site Assessment II Intrductin II Gather Site Infrmatin II Determine Hydrlgic Cnditins f Cncern II Determine Pllutants f Cncern II 2.4 Select Lw Impact Develpment Best Management Practices II Intrductin II Determine Perfrmance Criteria II Determine LID and Treatment Cntrl BMP Perfrmance Criteria II Site Design BMPs II Hydrmdificatin Cntrl BMPs II Surce Cntrl BMPs II 3.0 Alternative Cmpliance Appraches fr LID II 3.1 Waivers II 3.2 Water Quality Credits II Type f Prject Ptentially Qualifying fr Water Quality Credits II Applying Water Quality Credits t LID Perfrmance Criteria II 3.3 Treatment Cntrl BMPs II Determine Treatment Cntrl BMP Water Quality Perfrmance Criteria II Cmpute the Remaining Obligatin after Applying Treatment Cntrl BMPs II 3.4 Urban Runff Funds / Mitigatin Prgrams and Off-Site Mitigatin Prjects II Urban Runff Funds / Mitigatin Prgrams II Off-Site Mitigatin Prjects II 3.5 Use f Sub-Reginal r Reginal BMPs as Part f Alternative Cmpliance II 4.0 BMP Maintenance Requirements II 4.1 Maintenance Mechanisms II 4.2 Maintenance Requirements II-ii December 20, 2013

3 Cntents (cntinued) 7.II O&M Plan II O&M Cmmitments II 4.3 Permit Clseut Requirements II 5.0 WQMP Preparatin and Apprval II 5.1 Cnceptual r Preliminary WQMP Preparatin II 5.2 Final Prject WQMP Preparatin and Submittal II 5.3 Lcatin Map, Plt Plan, and BMP Details II 5.4 Educatinal Materials II 6.0 Resurces and References FIGURES TABLES Figure 7.II-1 Divisin f Permit Areas Figure 7.II-2 Overall WQMP Develpment Prcess Flw Chart Figure 7.II-3 WQMP Develpment Prcess Flw Chart Figure 7.II-4 Assessment fr Pririty Develpment Prjects Figure 7.II-5 Design the Site Incrprating LID BMPs Withut HCOCs Figure 7.II-6 Design the Site Incrprating LID BMPs With Ptential HCOCs Figure 7.II-7 Alternative Prgram Flw Chart fr Suth Orange Cunty Table 7.II-1 Divisin f Permit Areas Table 7.II-2 Pririty Develpment Prjects Categries fr Suth Cunty Permit Area Table 7.II-3 LID BMPs by Categry APPENDICES Appendix A Acrnyms and Glssary... A-1 A.1 Table f Acrnyms... A-1 A.2 Glssary f Key Terms... A-2 Appendix B EPA Green Streets Manual... B-1 Appendix C Applicable Hydrmdificatin Requirements... C-1 Nte: Hydrmdificatin requirements were in flux at the time f publicatin f this dcument. Appendix C includes a summary f current requirements at the time f publicatin and references t the assciated technical resurce(s) fr implementing these requirements. Appendix C is subject t change as the applicability f requirements changes. Please refer t t determine whether a newer versin f Appendix C is in effect. City f Laguna Beach Mdel WQMP 7.II-iii December 5, 2013

4 7.II Mdel Water Quality Management Plan (WQMP) 7.II 1.0 Intrductin The City f Laguna Beach Mdel Water Quality Management Plan (Mdel WQMP) has been develped t aid the Cunty f Orange, the Orange Cunty Fld Cntrl District, and the cities in Suth Orange Cunty (Permittees) and prject prpnents with addressing pst-cnstructin urban runff and strmwater pllutin frm new develpment and significant redevelpment prjects that qualify as Pririty Develpment Prjects. New develpment Pririty Develpment Prjects create new impervius surface n a previusly undevelped site. The amunt f new impervius surface that qualifies a prject as a Pririty Develpment Prject depends upn the prject type. Significant redevelpment prjects add r replace 5,000 r mre square feet f impervius surface n an already-develped site. These terms are further defined fr specific prject types in Sectin 7.II-1.2. This Mdel WQMP has been develped specifically fr Suth Orange Cunty, which is defined in Figure 7.II-1 and Table 7.II-1. LID BMP a BMP that prvides retentin r bifiltratin as part f an LID strategy these may include hydrlgic surce cntrls (HSCs), retentin, and bifiltratin BMPs The purpse f this Mdel WQMP is t describe the prcess that Permittees will emply fr develping a Prject WQMP fr pririty new develpment and redevelpment prjects, which, when implemented, will minimize the effects f urbanizatin n site hydrlgy, runff flw rates, and pllutant lads. Fllwing apprval f the final Prject WQMP and cnstructin f the prject, the Prject WQMP will serve t maintain the terms, cnditins, and requirements with the prject prpnent and their successrs and assigns. The effects f urbanizatin will be minimized thrugh implementatin f practicable and enfrceable prject-based cntrls r strmwater Best Management Practices (BMPs), r thrugh a cmbinatin f prject-based and reginal BMPs. Fr mst prjects, the prcess will first invlve preparing a Cnceptual r Preliminary WQMP t incrprate Lw Impact Develpment (LID) and hydrmdificatin cntrl BMPs where necessary at the earliest cnceptual planning stages f a prject fr early review. All Pririty Develpment Prjects will require a final Prject WQMP be prepared, regardless f whether a Cnceptual r Preliminary WQMP was prepared first. The prcess fr preparing Cnceptual r Preliminary WQMPs and/r final Prject WQMPs is described in Sectin 7.II-5.0, with supplemental infrmatin prvided in the Technical Guidance Dcument (TGD). By initiating runff management planning early in the develpment prcess, the Preliminary/Cnceptual WQMP can be used as the principal mechanism fr describing hw impacts f a prject will be reduced t less than significant when develping dcumentatin fr the prject t cmply with the Califrnia Envirnmental Quality Act (CEQA). Further discussin f the CEQA prcess in the cntext f New Develpment and Redevelpment Planning prcess and the rle f the Preliminary/ Cnceptual Mdel WQMP can be fund in the Orange Cunty Drainage Area Management Plan (DAMP) Sectin 7. City f Laguna Beach Mdel WQMP 7.II 1-1 December 20, 2013

5 The City f Laguna Beach Mdel WQMP identifies cntrls, referred t as lw impact develpment (LID) BMPs and hydrmdificatin BMPs as well as ther BMPs and alternative cmpliance prgrams, fr new develpment and redevelpment prjects that are subject t WQMP requirements pursuant t the DAMP Sectin 7. The Permittees require that certain new develpment and redevelpment prjects develp and implement a Cnceptual r Preliminary WQMP, and/r final Prject WQMP that includes LID BMPs and/r ther BMPs. Depending upn the prject size and characteristics, BMPs may include: Site design measures Implementing LID BMPs n-site Implementing hydrmdificatin cntrl BMPs n-site Utilizing alternative prgrams r treatment cntrl BMPs Emplying applicable surce cntrl BMPs Explanatin, definitins, and examples f the abve site design measures and BMP types as well as alternative prgrams are prvided later within this dcument. 7.II 1.1 Regulatry Basis The develpment f this Mdel WQMP is required by the Natinal Pllutant Discharge Eliminatin System (NPDES) Municipal Separate Strm Sewer System (MS4) permit held jintly by the Permittees in Suth Orange Cunty (Order N. R ). As authrized by the Federal Clean Water Act (CWA), the NPDES permit prgram cntrls water pllutin by regulating surces that discharge pllutants int waters f the United States. Suth Orange Cunty is defined as the area under the jurisdictin f the San Dieg Reginal Water Quality Cntrl Bard (SDRWQCB). Figure 7.II-1 shws the divisin f the Cunty between Nrth and Suth Cunty areas. Table shws which cities are situated within each permit area. The Cunty unincrprated area and three cities verlay bth permit areas. This Mdel WQMP des nt cntain criteria fr the Nrth Orange Cunty Permit area. City f Laguna Beach Mdel WQMP 7.II 1-2 December 20, 2013

6 Figure 7.II-1: Divisin f Permit Areas Table 7.II-1: Divisin f Permit Areas 7.II-1: Divisin f Permit Areas Jurisdictins Whlly within San Dieg Regin (SOC) City f Alis Viej City f Dana Pint City f Laguna Beach City f Laguna Niguel City f Missin Viej City f Ranch Santa Margarita City f San Clemente City f San Juan Capistran Jurisdictins within bth the NOC and SOC Regins Cunty f Orange Orange Cunty Fld Cntrl District City f Laguna Hills City f Laguna Wds City f Lake Frest City f Laguna Beach Mdel WQMP 7.II 1-3 December 20, 2013

7 A draft versin f this Mdel WQMP fr Suth Orange Cunty was submitted t the SDRWQCB n December 16, The SDRWQCB reviewed the Draft Mdel WQMP fr cmpliance with the Furth Term MS4 Permit fr Suth Orange Cunty (Suth Cunty Permit, Order R ) and issued a cnditinal finding f adequacy (Memrandum dated June 20, 2013: Cnditinal Finding f Adequacy fr the December 16, 2011 Mdel Water Quality Management Plan (Mdel WQMP) fr Suth Orange Cunty MS4 Permit Order N. R , NPDES N. CAS108740). By December 20, 2013, Suth Orange Cunty (SOC) Area Permittees are required t adpt their wn lcal Jurisdictinal Runff Management Prgram (JRMP) and Lcal Standard Strmwater Mitigatin Plan (Lcal SSMP, als knwn as Lcal Implementatin Plan, LIP) incrprating all requirements f this Mdel WQMP (see DAMP, Appendix A-7). Using the Lcal SSMP (r LIP) as a guide, each SOC Area Permittee will review and apprve Prject WQMPs as part f the develpment plan and entitlement apprval prcess r the ministerial permit apprval prcess fr pririty new develpment and redevelpment prjects as defined in DAMP Sectin 7.6 and Table 7.II-2. Sectin F.1.d(9) f the Suth Orange Cunty MS4 Permit (Order N. R ) requires that each Lcal SSMP (r LIP) adpted by SOC Permittees describe a prcess that will be implemented t verify cmpliance with Mdel WQMP requirements. The prcess must identify at what pint in the planning prcess pririty new develpment and redevelpment prjects will be required t meet Mdel WQMP requirements and, at a minimum, that these pririty develpment prjects implement the required pstcnstructin BMPs prir t ccupancy and/r the intended use f any prtin f the prject. The prcess must als include identificatin f the rles and respnsibilities f varius municipal departments in implementing the Mdel WQMP requirements, as well as any ther measures necessary fr the implementatin f Mdel WQMP requirements. 7.II 1.2 Pririty Develpment Prject Categries This Mdel WQMP describes the prcess fr preparing Cnceptual r Preliminary WQMPs and final Prject WQMPs fr certain new develpment and redevelpment prjects called "Pririty Develpment Prjects." A prject is cnsidered a Pririty Develpment Prject if it meets any ne f the criteria listed in Table 7.II-2. City f Laguna Beach Mdel WQMP 7.II 1-4 December 20, 2013

8 Table 7.II-2: Pririty Develpment Prjects Categries fr Suth Cunty Permit Area 1. New develpment prjects that create r add 10,000 square feet r mre f impervius surface. This categry includes cmmercial, industrial, residential husing subdivisins, mixed-use, and public prjects n private r public prperty that falls under the planning and building authrity f the Permittees. 2. Autmtive repair shps. This applies t facilities that are categrized in any ne f the fllwing Standard Industrial Classificatin (SIC) cdes 5013, 5014, 5541, , and Restaurants where the land area f develpment is 5,000 square feet r mre including parking area. This categry is defined as facilities that sell prepared fds and drinks fr cnsumptin, including statinary lunch cunters and refreshment stands selling prepared fds and drinks fr immediate cnsumptin (SIC cde 5812), where the land area fr develpment is greater than 5,000 square feet. Restaurants where land develpment is less than 5,000 square feet shall meet all WQMP requirements except fr LID BMP, treatment cntrl BMP, and hydrmdificatin/hcoc requirements. 4. Hillside develpment greater than 5,000 square feet. Hillside develpment is defined as any develpment which is lcated in an area with knwn ersive sil cnditins r where the natural slpe is 25 percent r greater. 5. All develpment lcated within r directly adjacent t r discharging directly t an ESA (where discharges frm the develpment r redevelpment will enter receiving waters within the ESA), which either creates 2,500 square feet f impervius surface n a prpsed prject site r increases the area f imperviusness f a prpsed prject site t 10 percent r mre f its naturally ccurring cnditin. Directly adjacent means situated within 200 feet f the ESA. Discharging directly t means utflw frm a drainage cnveyance system that is cmpsed entirely f flws frm the subject develpment r redevelpment site, and nt cmmingled with flws frm adjacent lands. 6. Parking lts 5,000 square feet r mre, r parking lts with 15 parking spaces r mre, including assciated drive aisle, and ptentially expsed t urban strmwater runff. A parking lt is defined as a land area r facility fr the temprary parking r strage f mtr vehicles used persnally, fr business, r fr cmmerce. 7. Streets, rads, highways, and freeways. This categry includes any public r private paved surface that is 5,000 square feet r greater used fr the transprtatin f autmbiles, trucks, mtrcycles, and ther vehicles. (See discussin under (Sectin 7.II-1.5 relative t public prjects). City f Laguna Beach Mdel WQMP 7.II 1-5 December 20, 2013

9 8. Thse redevelpment prjects that create, add, r replace at least 5,000 square feet f impervius surface n an already develped site and the existing develpment r redevelpment prject falls under anther Pririty Develpment Prject Categry. Where redevelpment results in the additin r replacement f less than 50 percent f the impervius surfaces f a previusly existing develpment site, and the existing develpment was nt subject t WQMP requirements, the numeric sizing criteria discuss belw nly applies t the additin r replacement, and nt the entire develpment. Where redevelpment results in an additin r replacement f mre than 50 percent f the impervius surfaces, the Prject WQMP requirements apply t the entire develpment. 9. Retail Gasline Outlets (RGOs). This categry includes RGOs that meet the fllwing criteria: (a) 5,000 square feet r mre, r (b) a prjected Average Daily Traffic (ADT) f 100 r mre vehicles per day. 10. Effective December 16, 2012, all pllutant generating develpment r redevelpment prjects that result in the disturbance f ne acre r mre f land are cnsidered a Pririty Develpment Prject. This categry f Pririty Develpment Prjects is in additin t thse categries described abve in this table. 7.II 1.3 Nn-Pririty Develpment Prjects The prvisins f this Mdel WQMP d nt apply t prjects if they d nt meet the criteria t be cnsidered a Pririty Develpment Prject. 7.II 1.4 Use f the Mdel WQMP, TGD, and WQMP Templates Three dcuments have been develped t supprt the Pririty Develpment Prject requirements: a Mdel WQMP, a TGD, and a WQMP Template. This Mdel WQMP describes the requirements fr preparing a Prject WQMP. The TGD cntains supprting technical guidance n hw t perfrm the technical analyses necessary t prepare a Prject WQMP. The WQMP Template shuld be used t prepare a Prject WQMP. Additinally, Appendix C t this Mdel WQMP describes the criteria currently in place fr hydrmdificatin cntrl (subject t change) and directs the user t the apprpriate reference(s) t find guidance fr implementing hydrmdificatin cntrl requirements. The TGD has been prepared as a cmpanin t this Mdel WQMP (DAMP Sectin 7.III). The TGD cntains mre detailed infrmatin and explains hw t cmplete the requirements and the technical analyses necessary fr preparing a Cnceptual r Preliminary WQMP r Prject WQMP. Thrughut this dcument, references t the TGD will be made, including the sectin f the TGD where the crrespnding infrmatin is lcated. The WQMP Template is t be used by prject prpnents as a tl fr the preparatin and submittal f Prject WQMPs. The WQMP Template cntains the verall structure fr develping a Cnceptual r Preliminary WQMP r final Prject WQMP, including fields fr entering general infrmatin and space fr sizing calculatins and ther analyses necessary fr WQMP cmpletin. It is expected that prject prpnents will adapt the WQMP template as needed, t prvide the required infrmatin in a manner that demnstrates cnfrmance t applicable criteria. City f Laguna Beach Mdel WQMP 7.II 1-6 December 20, 2013

10 This Mdel WQMP includes the fllwing sectins: Sectin 7.II 1.0 prvides an intrductin t the verall regulatry basis and purpse f the Mdel WQMP, an verview n the use f the Mdel WQMP, the TGD and the WQMP Template, an verview f applicable pririty develpment prjects, and the general prcess steps fr develping a Cnceptual r Preliminary WQMP, r Prject WQMP. Sectin 7.II 2.0 describes the Prject WQMP requirements, and guides the reader thrugh the parts f the Prject WQMP. Sectin 7.II 3.0 describes alternative cmpliance appraches. Sectin 7.II 4.0 cntains BMP funding and maintenance requirements. Sectin 7.II 5.0 describes the prcess fr Prject WQMP preparatin, submittal, and apprval. Sectin 7.II 6.0 prvides additinal prject WQMP related resurces and the references used fr prducing this Mdel WQMP. The intended users f the Mdel WQMP are summarized in the fllwing table. Dcument Intended users Rle f Dcument Mdel Water Quality Management Plan Permittee planning, permitting and NPDES prgram staff Technical Guidance Dcument WQMP Template Prject applicants and planning and design cnsultants Permitting and NPDES prgram staff Prject applicants and planning and design cnsultants Prject applicants and planning and design cnsultants City and cunty planning and permitting staff DAMP Sectin 7 Permittee NPDES prgram staff and planning staff Prvides regulatry requirements and directin fr preparing and submitting a Cnceptual r Preliminary WQMP and/r Final Prject WQMP Prvides Technical Guidance and details fr site planning and selectin and f BMPs t meet the perfrmance criteria Prvides technical basis fr dcumenting feasibility f LID BMPs Prvides a template and instructins fr preparing a sitespecific Preliminary/Cnceptual and Final Prject WQMP Prvides prgram directin t Permittee staff fr all aspects f New Develpment/Significant Redevelpment Prgram Bth the TGD and WQMP Template are lcated at the City f Laguna beach website City f Laguna Beach Mdel WQMP 7.II 1-7 December 20, 2013

11 7.II 1.5 Public Agency Prjects New develpment/redevelpment requirements apply t public agency prjects that meet the definitins in the Pririty Develpment Prject categries described abve. In general, the same Prject WQMP verall develpment steps described herein apply t public agency prjects as well as private develpment prjects. Hwever, there are unique issues assciated with certain public agency prjects that are either specifically recgnized in the MS4 Permit, r fr which particular appraches can be cnsidered. Public agency street, rad, highway, and freeway Pririty Develpment Prjects are subject t the standard hierarchy f LID and hydrmdificatin requirements applicable t ther categries f Pririty Develpment Prjects as described in Sectin 7.II and 7.II f this Mdel WQMP. Pririty Develpment Prjects may emply a green street design apprach that incrprates United States Envirnmental Prtectin Agency (USEPA) guidance, Managing Wet Weather with Green Infrastructure: Green Streets in a manner cnsistent with the maximum extent practicable (MEP) standard. A cpy f the guidance is included in Appendix B. Hwever, these prjects must demnstrate that they meet the LID and hydrmdificatin standards applicable t ther categries f Pririty Develpment Prjects as described in Sectin 7.II and 7.II f this Mdel WQMP. Abve grund linear lined drainage prjects typically cnsist f lined vertical r trapezidal channels. These prjects may result in the creatin f mre than 10,000 square feet f impervius surface r the additin f mre than 5,000 sq-ft t an existing develped site, which wuld result in a categrizatin as a Pririty Develpment Prject. These types f prjects are permitted t use the Green Infrastructure guidance as described in Appendix B and Sectin 2.7 f the TGD. Individual Permittees may elect t develp a separate Master Prject WQMP fr anticipated future prjects with similar characteristics based upn the requirements utlined in this dcument. A Master Prject WQMP dcument wuld need t list the public agency prjects that are anticipated t ccur within the Permittee s jurisdictin ver a given time perid and the prpsed methds f cmpliance with this Mdel WQMP. Belw grund linear drainage and utility cnstructin prjects, such as strm drains, sewers and water lines, may result in the replacement f mre than 5,000 square feet f impervius surface within a develped public street, rad r highway. Hwever, such prjects wuld nt qualify as a Pririty Develpment Prject if they maintain riginal line and grade, hydraulic capacity, riginal purpse f the facility, r ccur in respnse t an emergency t prtect public health and safety. Cnsequently, these prjects wuld nt require the preparatin f a Prject WQMP. 7.II 1.6 WQMP Develpment Prcess Several steps are invlved in cmpleting an apprvable Cnceptual r Preliminary WQMP, r final Prject WQMP fr new develpment r significant redevelpment prjects. Figure7.II-2 displays an verview WQMP flwchart and the majr implementatin and decisin steps that must be fllwed t successfully cmplete a Prject WQMP fr the SOC Permit Area. Each f the steps identified in the flw chart City f Laguna Beach Mdel WQMP 7.II 1-8 December 20, 2013

12 are described in later sectins f the Mdel WQMP. The relevant sectins which detail each step are referenced in the verall WQMP flw chart. Figure 7.II-3 prvides a mre detailed verview f the steps in the prcess. Each f these steps is described in mre detail in Sectin 7.II-2.0. Figure 7.II-2: Overall WQMP Develpment Prcess Flw Chart Nte: Mdel WQMP sectins shwn in red City f Laguna Beach Mdel WQMP 7.II 1-9 December 20, 2013

13 Figure 7.II-3: WQMP Develpment Prcess Flw Chart Nte: Mdel WQMP sectins shwn in red City f Laguna Beach Mdel WQMP 7.II 1-10 December 20, 2013

14 7.II 2.0 Prject WQMP Requirements The purpse f the Prject WQMP is t define prject features and BMPs that will mitigate the prject s impacts n receiving water quality and hydrmdificatin. In rder t cmplete a Prject WQMP, the fllwing steps will need t be perfrmed: 1. Determine discretinary permits and water quality cnditins that may apply Sectin 7.II Describe the prject Sectin 7.II Assess the site Sectin 7.II Develp and select BMPs, including LID BMPs, site design BMPs, hydrmdificatin cntrl BMPs, and surce cntrl BMPs Sectin 7.II Determine any applicable alternative cmpliance appraches Sectin 7.II Identify parties respnsible fr BMP maintenance and funding surces Sectin 7.II-4.0 The first fur steps are discussed in the fllwing subsectins. Additinal infrmatin with technical guidance and supprting infrmatin can be fund in the TGD. 7.II 2.1 Discretinary Permit(s) and Water Quality Cnditins This Mdel WQMP prvides a framewrk fr addressing General Plan, discretinary permit cnditins, water quality cnditins, and cmplying with CEQA. Cmpliance with the requirements set frth in this dcument can prvide the basis fr evaluating the surface water impacts and any mitigatin measures and can be sufficiently specific t satisfy the requirements f CEQA with regards t prjects. See TGD Sectin 2.1 fr additinal details regarding discretinary permits and water quality cnditins. 7.II 2.2 Prject Descriptin The Prject WQMP shall cntain an verall descriptin f the prject including permit applicability, whether the prject is in NOC and/r SOC Permit Areas, if it is in an envirnmentally sensitive area (ESA), whether it may be eligible fr water credits (as discussed in Sectin 7.II-3.2), and whether the prject cntains specific features, such as abve grund linear facilities that wuld require specific BMP appraches (as discussed in Sectin 7.II-2.4.2). See TGD Sectin 2.2 fr additinal details regarding prject descriptins. 7.II 2.3 Site Assessment 7.II Intrductin Site assessment invlves the fllwing steps: 1. Gather site infrmatin. 2. Determine if hydrlgic cnditins f cncern are applicable. 3. Determine ptential pllutants f cncern (POCs). City f Laguna Beach Mdel WQMP 7.II 2-1 December 20, 2013

15 Using this infrmatin, the applicable perfrmance criteria that apply t the remaining steps in the verall prcess can be determined. Each f these steps is described in mre detail in the fllwing subsectins. A flw chart f the key steps and decisins required fr site assessment is shwn in Figure 7.II-6. See TGD Sectin 2.3 fr the technical basis fr develping site descriptins. 7.II Gather Site Infrmatin Basic infrmatin fr the site must be cmpiled. Specific details fr cmpiling this infrmatin can be fund in the TGD Sectin 2.3. The infrmatin that must be cmpiled is listed belw: Cmmunity Name r Planning Area (if lcated in planned cmmunity): Prvide exhibit f the bundary f the prject site and surrundings in sufficient detail t allw prject lcatin t be shwn n a base map. Site specifics: Prvide general and specific lcatin, site address, parcel number, and size (acreage t the nearest 1/10 acre). Watershed name: Prvide the name f the receiving water and infrmatin n hw runff wuld enter the receiving water (i.e., thrugh a strm drain, an unnamed tributary, r direct discharge thrugh an utfall int the water bdy). Site characteristics: Include a descriptin f site drainage (including wnership) and hw it ties with the drainage frm the surrunding prperty. Refer t the Prject WQMP s Plt Plan shwing drainage flw arrws and hw drainage ties t drainage f surrunding prperty. Additinal infrmatin: Prvide additinal infrmatin as described in TGD Sectin 2.3, as necessary t supprt evaluatin f LID feasibility, selectin, and design, ptentially regarding the fllwing subject areas: Tpgraphy Sil Type and Gelgy Carse Sediment Supply Areas (see Appendix C fr further infrmatin) Grundwater and Sil Cntaminatin Grundwater Levels Grundwater/Sil Cntaminatin Prtectin f Grundwater Quality Grundwater Recharge Grundwater/Surface Water Interactins Getechnical Cnsideratins Cllapsible Sils Expansive Sils Slpes Liquefactin City f Laguna Beach Mdel WQMP 7.II 2-2 December 20, 2013

16 Managing Off-Site Drainage Existing Utilities ESAs Figure 7.II-4: Assessment fr Pririty Develpment Prjects Nte: Mdel WQMP sectins shwn in red City f Laguna Beach Mdel WQMP 7.II 2-3 December 20, 2013

17 Site assessment must invlve cllecting relevant infrmatin t address tw primary issues: Determine Hydrlgic Cnditins f Cncern (HCOCs) Determine POCs Technical details regarding hw t determine if there is a HCOC in dwnstream receiving waters frm the prject site and hw t select and size BMPs t prvide fr hydrmdificatin cntrl (hydrmdificatin cntrl BMPs) if HCOCs exist is prvided in Appendix C f this Mdel WQMP (r by reference frm Appendix C). Additinal infrmatin regarding hw t identify POCs, and related pririty POCs, and hw t select a cmbinatin f surce cntrl, LID, and treatment cntrl BMPs that are effective at remving thse pllutants frm strmwater runff frm the prject site is prvided in TGD Sectin II Determine Hydrlgic Cnditins f Cncern An HCOC exists when a site s hydrlgic regime is altered and there are significant impacts n dwnstream channels and aquatic habitats, alne r in cnjunctin with impacts f ther prjects. Hydrmdificatin is the alteratin f natural flw characteristics and sediment supply in streams and channels due t urbanizatin, which can result frm new develpment and significant redevelpment prjects withut apprpriate preventative cntrls. Hydrmdificatin cntrls are implemented in rder t prevent hydrmdificatin frm happening. Urbanizatin cmmnly results in increased runff vlume and velcity; reduced infiltratin; increased flw frequency, duratin, and peaks; and faster time t reach peak flw. Under certain circumstances, urbanizatin culd als result in the reductin in the amunt f sediment supplied t the channel fr transprt. If the sediment supplied t the channel is reduced such that in-stream flws are transprting sediment faster than it can be replenished, then ersin f the channel s bed and bank may ccur. These changes have the ptential t permanently impact dwnstream channels and habitat integrity. A change t a Pririty Prject site s hydrlgic characteristics wuld be cnsidered a cnditin f cncern if the change wuld have a significant impact n dwnstream natural channels and habitat integrity. Pririty Develpment Prject prpnents shall use the appraches identified in Appendix C (r by reference frm Appendix C) t determine if the Prject has an HCOC. In Suth Orange Cunty, all prjects are cnsidered t have a ptential HCOC unless they are tributary t an exempt receiving water as defined in Appendix C (r by reference frm Appendix C). 7.II Determine Pllutants f Cncern Strmwater runff frm new develpment and significant redevelpment prject sites has the ptential t cntribute pllutants, including suspended slids/sediment, nutrients, metals, micrbial pathgens, il and grease, txic rganic cmpunds, and trash and debris frm the municipal strm drain system t tributary receiving waters. Knwing the POCs is necessary t select the mst effective BMPs, since sme BMPs are mre effective fr sme pllutants than thers. POCs are identified based n the City f Laguna Beach Mdel WQMP 7.II 2-4 December 20, 2013

18 pllutants that are anticipated t be generated by a prject based n the type f develpment prject that is prpsed. Primary POCs are any pllutants anticipated t be generated by the prject that als have apprved TMDLs r which are causing an impairment fr which a TMDL has nt yet been apprved. Other POCs are thse pllutants anticipated t be generated by the prject that have nt been identified as causing impairment nr have an adpted TMDL fr the prject s receiving waters. TGD Sectin prvides technical details regarding identifying POCs. Further infrmatin n POCs may als be available frm the envirnmental impact assessment fr the prject (e.g., prject-specific pllutant evaluatins in CEQA Envirnmental Impact Reprts). This site-specific infrmatin shuld be used t supplement, r in sme cases supersede, the POCs identified thrugh the methds described in this sectin. Any site-specific infrmatin used t identify additinal POCs r remve a pllutant frm being a presumed POC must be based n substantial evidence and justified in either the prject s CEQA dcument and/r the prject WQMP. Watershed planning dcuments previusly develped by Orange Cunty shuld als be reviewed fr identificatin f specific implementatin requirements that address POCs, where applicable. 7.II 2.4 Select Lw Impact Develpment Best Management Practices 7.II Intrductin BMPs are prgrams and plicies, including structural cntrls that are implemented t cntrl the discharge f pllutants. This Mdel WQMP describes LID BMPs, site design BMPs, hydrmdificatin cntrl BMPs, surce cntrl BMPs and treatment cntrl BMPs. Using the infrmatin cmpiled abve, the fllwing steps must be taken t determine what perfrmance criteria apply t the prject: 1) LID, 2) treatment cntrl, and 3) hydrmdificatin cntrl. These perfrmance criteria are evaluated individually althugh they can be interrelated. It is pssible t meet ne and nt meet the thers. This is synnymus with perfrmance standard as used by ther guidance dcuments, but nly perfrmance criteria is used in this dcument. Several steps must be fllwed in rder t determine what perfrmance criteria will apply t a prject. These steps include: 1. Determining if the prject is an abve grund linear lined drainage facility. If the prject is an abve grund linear lined drainage facility, then fllw alternative cmpliance requirements, by incrprating US EPA guidance Managing Wet Weather with Green Infrastructure: Green Streets. Refer t Appendix B f this dcument fr the EPA guidance and TGD Sectin fr additinal technical infrmatin. 2. Determining site design and LID perfrmance criteria. 3. Determining treatment cntrl BMP perfrmance criteria. 4. Calculating the LID design strm capture vlume. 5. Determining hydrmdificatin cntrl perfrmance criteria. City f Laguna Beach Mdel WQMP 7.II 2-5 December 20, 2013

19 6. Cmpleting the LID BMP selectin prcess. Once the perfrmance criteria have been established, the next step is t develp and select site design practices and n-site LID BMPs and hydrmdificatin cntrl BMPs based n these prject-specific criteria. 7.II Determine Perfrmance Criteria 7.II Determine if the Prject is an Abve Grund Linear Lined Drainage Facility If the prpsed prject is a public agency prject that is an abve grund linear lined drainage facility, the prject shall incrprate USEPA guidance, Managing Wet Weather with Green Infrastructure: Green Streets (see Appendix B) in a manner cnsistent with the MEP standard. Separate cmpliance requirements fr these prjects are discussed in TGD Sectin 2.7. Public agency street prjects that meet criteria t be cnsidered a Pririty Develpment Prject may emply a green street design apprach, hwever, these prjects must demnstrate that they meet the full LID and hydrmdificatin standards applicable t the remaining categries f Pririty Develpment Prjects as described in Sectin and f this Mdel WQMP. 7.II Determine Hydrmdificatin Perfrmance Criteria Hydrmdificatin criteria are applicable t all Pririty Develpment Prjects, except thse that discharge t an exempt receiving water. Appendix C identifies the hydrmdificatin cntrl criteria that are currently applicable in Suth Orange Cunty, and includes technical guidance fr addressing these criteria (within Appendix C and/r by reference frm Appendix C). 7.II Determine LID and Treatment Cntrl BMP Perfrmance Criteria The fllwing perfrmance criteria fr LID implementatin are stated in the Suth Orange Cunty MS4 Permit: Pririty Develpment Prjects must infiltrate, harvest and use, evaptranspire, r bifilter, the 85th percentile, 24-hur strm event (Design Capture Vlume). A prperly designed bifiltratin system may nly be cnsidered if infiltratin, harvest and use, and evaptranspiratin (ET) cannt be feasibly implemented fr the full design capture vlume. In this case, infiltratin, harvest and use, and ET practices must be implemented t the greatest extent feasible and bifiltratin may be prvided fr the remaining design capture vlume. A diversity f cntrls must be prvided, where feasible, t achieve the greatest feasible retentin f the Design Capture Vlume, then if necessary, bifiltratin f the remaining design capture vlume. The Design Capture Strm Depth is the 85th percentile, 24-hr strm depth that, when applied t the prject site, results in runff equal t the Design Capture Vlume (DCV). The design capture strm depth varies acrss the Cunty and is shwn in TGD Exhibit XVI-1. The TGD prvides infrmatin fr determining the applicable design capture City f Laguna Beach Mdel WQMP 7.II 2-6 December 20, 2013

20 strm depth t apply t a prject t calculate design capture vlume as well as guidance fr recmmended hydrlgic methds. Equivalent LID perfrmance criteria have been synthesized frm the permit requirements with cnsideratin f the MEP standard and analysis f lcal precipitatin and ET patterns. The fllwing perfrmance criteria result in capture and retentin and/r bifiltratin f 80 percent f average annual strmwater runff vlume. The perfrmance criteria fr LID are stated as fllws: LID BMPs must be designed t retain (infiltrate, harvest and use, r evaptranspire), n-site, strmwater runff up t 80 percent average annual capture efficiency. LID BMPs must be designed t: Retain (infiltrate, harvest and use, r evaptranspire), n-site, strmwater runff as feasible up t the Design Capture Vlume; and Recver (i.e., draw dwn) the strage vlume as sn as pssible after a strm event (see criteria fr maximizing drawdwn rate in the TGD Appendix XI); and, if necessary, Bifilter, n-site, additinal runff, as feasible, up t 80 percent average annual capture efficiency (cumulative, retentin plus bifiltratin); and, if necessary Fulfill alternative cmpliance bligatins fr runff vlume nt retained r bifiltered up t 80 percent average annual capture efficiency using treatment cntrls r ther alternative appraches as described in Sectin 7.II-3. Where a prject can retain the DCV and drain this vlume in less than r equal t 48 hurs fllwing the end rainfall, the system is cnsidered t achieve 80 percent capture, as described in the TGD, Appendix III. When bifiltratin is used, the vlume prvided in the pre-filter detentin vlume (surface strage) and pres f bifiltratin BMPs may nt be less than 75 percent f the remaining DCV, regardless f the average annual capture efficiency achieved. The prefilter vlume criterin is nt applicable t infiltratin systems. Further discussin n determining the pre-filter detentin vlume and calculating BMP sizing t meet these criteria are prvided in the TGD and the TGD Appendix II and III. 7.II Selecting LID BMPs The Suth Cunty Permit stresses the imprtance f prject planning and design utilizing the principles f LID. The use f LID BMPs is intended t reduce the discharge f pllutants and the effects f changes t runff patterns caused by land use mdificatins. Permit requirements fr Pririty Develpment Prjects must be met thrugh the use f structural and nn-structural BMPs, with fremst cnsideratin given t LID BMPs. The primary gal f using LID BMPs is t preserve a site s predevelpment hydrlgy in rder t preserve the integrity f receiving water bdies. The adverse effects f changes t runff patterns and pllutant lading n receiving water bdies caused by City f Laguna Beach Mdel WQMP 7.II 2-7 December 20, 2013

21 land use mdificatins can be reduced thrugh the use f structural and nn-structural techniques that stre, infiltrate, evaprate, and detain runff. Predevelpment is defined as the naturally ccurring (pre-human disturbance) cnditins. The Suth Cunty Permit cntains requirements t implement LID practices in rder t address the impacts f hydrmdificatin and pllutin f strmwater runff frm a Pririty Develpment Prject n the physical, chemical, and bilgical integrity f receiving waters. A list f LID BMPs is shwn in Table 7.II 3. Specific details and fact sheets fr each BMP are prvided in TGD Sectins 4 and TGD Appendix XIV. Table 7.II-3: LID BMPs by Categry ET and Infiltratin Evapratin Harvest and Use Bifiltratin 1 Infiltratin Trenches Infiltratin Basins Biretentin Withut Underdrains Biinfiltratin Drywells Permeable Pavement Prprietary Infiltratin Green Rfs Brwn Rfs Blue Rfs Cisterns Undergrund Detentin Irrigatin Use Dmestic Use Biretentin With Underdrains Strmwater Planter Bxes With Underdrains Prprietary Bifiltratin Systems meeting Permit definitin f bifilter (see Ftnte 1) The TGD defines an additinal categry f LID BMPs called Hydrlgic Surce Cntrls (HSCs) that may be used as part f cmpliance with LID requirements via quantitative appraches defined in the TGD, including: Lcalized n-lt infiltratin, Impervius area dispersin (e.g. rf tp discnnectin), Street trees(canpy interceptin), Residential rain barrels (nt actively managed), Green rfs/ brwn rfs, Blue rfs, and 1 When bifiltratin is used, the vlume prvided in the pre-filter detentin vlume (surface strage) and pres f bifiltratin BMPs may nt be less than 75 percent f the remaining design capture vlume, regardless f the average annual capture efficiency achieved. Further discussin n determining the pre-filter detentin vlume and calculating BMP sizing t meet these criteria are prvided in the TGD and the TGD Appendix II and III. City f Laguna Beach Mdel WQMP 7.II 2-8 December 20, 2013

22 Impervius area reductin (permeable pavers, site design). Additinally, the fllwing treatment cntrl and pre-treatment BMPs may be used, as applicable, hwever these BMPs d nt meet LID requirements: Cnstructed wetlands, Vegetated swales, Vegetated filter strips, Dry extended detentin basins, Wet extended detentin basins, Prprietary bitreatment (except when designed t meet pre-filter detentin vlume criteria defined in Ftnte 1), Media filters (sand filters), and Hydrdynamic separatrs and catch basin inserts. While requirements fr LID BMPs, treatment cntrl BMPs, and hydrmdificatin cntrl are stated independently in the Permit, and Pririty Develpment Prjects must demnstrate cmpliance with each requirement individually, the requirements verlap significantly and sme management practices may fulfill r partially fulfill ne r mre requirements. The LID and treatment cntrl requirements are especially interrelated because full cmpliance with LID requirements nsite inherently results in cmpliance with treatment cntrl requirements. LID and hydrmdificatin cntrl requirements are als interrelated as bth are based n reductin f runff vlume as their first pririty. Hwever, meeting the perfrmance criteria fr either LID BMPs r hydrmdificatin cntrl BMPs des nt imply that the perfrmance criteria fr the ther has categry been met. As a result, a prject that has HCOCs will need t dcument that it has met the perfrmance criteria fr bth categries f BMPs. The steps invlved in selecting LID practices are described in mre detail in the fllwing subsectins. A flw chart f the key steps and decisins required fr selecting LID BMPs is shwn in Figure 7.II-7 fr prjects where there is n ptential fr HCOCs and Figure 7.II-8 fr Prjects which must cnsider HCOCs. The TGD expands n these steps and prvides specific instructins fr selecting, designing, and dcumenting the use f LID practices. Where BMP fact sheets in the TGD specify selectin and/r design criteria, the applicable selectin and/r design criteria must be used. The TGD Sectin discusses the prcess f selecting, lcating, and sizing LID BMPs and als prvides specific LID design criteria and a prcess that must be fllwed t determine if it is feasible t incrprate LID BMPs. The feasibility analysis will prvide the basis fr dcumenting prject and site cnditins under which it is nt feasible t fully meet the LID BMP perfrmance criteria leading t use f an alternative strategy as discussed further in Sectin 7.II II LID Practices Implemented n a Reginal r Sub-Reginal Basis While mst f the LID practices and LID BMPs described in this Mdel WQMP are fcused at an individual prject level, it may be mst apprpriate t implement LID BMPs beynd the bundaries f the specific develpment being prpsed n a brader City f Laguna Beach Mdel WQMP 7.II 2-9 December 20, 2013

23 scale: (1) reginal (several develpments within the same watershed); r (2) sub-reginal (multiple adjacent develpments within the same watershed) fr certain develpment cnditins. There culd be multiple benefits and/r cnstraining factrs, including, but nt limited t, smart grwth gals, water cnservatin and grundwater recharge benefits sil cnditins, grundwater levels, sil and/r grundwater cntaminants, space restrictins r redevelpment pprtunities and ecnmic cnsideratins. Where a develpment prject greater than 100 acres in ttal prject size, r smaller than 100 acres in size yet part f a larger cmmn plan f develpment that is ver 100 acres, has been prepared using watershed and/r sub-watershed based water quality, hydrlgic, and fluvial gemrphlgic planning principles that implement reginal LID BMPs in accrdance with the sizing and lcatin criteria f the Suth Cunty Permit and acceptable t the Reginal Bard, such standards shall gvern review f prjects and shall be deemed t satisfy the Suth Cunty Permit s requirements fr LID site design, buffer zne, infiltratin and grundwater prtectin standards, surce cntrl, treatment cntrl, and hydrmdificatin cntrl standards. Reginal BMPs must clearly exhibit that they will nt result in a net impact frm pllutant ladings ver and abve the impact caused by capture and retentin f the design strm with n-site LID BMPs. Fr Pririty Develpment Prjects that d nt meet the criteria in the previus paragraph, cmpliance with LID using sub-reginal r reginal (ff-site) BMPs is cnsidered Alternative Cmpliance and requires that an request fr waiver f n-site LID BMPs first be prepared befre participating in a sub-reginal/reginal LID slutin. Additinal Alternative Cmpliance infrmatin can be fund in Sectin 7.II-3.0, and details cncerning n-site LID BMP waivers can be fund in Sectin 7.II-3.1. City f Laguna Beach Mdel WQMP 7.II 2-10 December 20, 2013

24 Figure 7.II-5: Design the Site Incrprating LID BMPs Withut HCOCs Nte: Mdel WQMP sectins shwn in red City f Laguna Beach Mdel WQMP 7.II 2-11 December 20, 2013

25 Figure 7.II-6: Design the Site Incrprating LID BMPs With Ptential HCOCs Nte: Mdel WQMP sectins shwn in red City f Laguna Beach Mdel WQMP 7.II 2-12 December 20, 2013

26 7.II Site Design BMPs LID site design practices include a wide range f ptential practices that can be implemented t reduce the vlume f strmwater runff generated n a prject site as well as imprve the quality f runff that leaves the site and help avid dwnstream hydrmdificatin impacts. LID site design is predminantly preventative in nature as it cnsists f practices that reduce the amunt f runff and ther impacts befre, r immediately after, they ccur. Examples f preventative aspects f LID site design include reductin f impervius area, preservatin f drainage curses, and restratin f impacted sils. Descriptins f the mst cmmn site design practices are prvided in TGD Sectin There are n numeric perfrmance criteria fr site design practices, hwever, LID site design shuld be cnsidered as the first pririty in the hierarchy f LID implementatin, beginning with the earliest phases f a prject. The use f effective site design practices can result in a reductin in the vlume f strmwater runff that must be retained, a reductin f the design capture vlume, and the related reductin in the size f structural treatment BMPs than if site design practices are nt used. Allcating space fr BMPs in the site design at the earliest phases f the prject planning prcess can allw prjects t mre easily satisfy numeric perfrmance criteria. On-site LID practices that shuld be cnsidered include, but are nt limited t, the fllwing: Maximize Natural Infiltratin Capacity and Grundwater Recharge (where apprpriate), Preserve Existing Drainage Patterns and Time f Cncentratin, Prtect Existing Vegetatin and Sensitive Areas, Minimize Impervius Area, Discnnect Impervius Areas, Minimize Cnstructin Ftprint, and Re-vegetate Disturbed Areas. Each f these techniques is described further in the TGD Sectin 3. Certain site design practices are referred t as HSCs, and can be cunted tward LID perfrmance criteria. These HSC are described in TGD Sectin 4 and TGD Appendix XIV. In additin, where hydrmdificatin criteria apply, site design activities shuld include identificatin and preservatin f areas f carse sediment supply. Mre technical guidance n managing carse sediment supply can be fund in Appendix C (r by reference frm Appendix C). 7.II Hydrmdificatin Cntrl BMPs All prjects must address hydrmdificatin unless they are identified as exempt under the applicable criteria that apply t the prject. Applicable hydrmdificatin cntrl criteria and exempt categries are defined in Appendix C (r by reference frm Appendix C). It may be beneficial t a PDP t use vlume retentin (i.e. LID BMPs) t City f Laguna Beach Mdel WQMP 7.II 2-13 December 20, 2013

27 meet the hydrmdificatin requirements, hwever detentin-based BMPs can als be used. LID BMPs may partially r fully satisfy the requirements t address hydrmdificatin. Additinal retentin and/r flw cntrl vlume may be required t fully satisfy hydrmdificatin criteria. This may require adaptatin f typical LID r treatment cntrl BMP designs, such as thrugh the additin f detentin vlume and a flw cntrl utlet structure. 7.II Surce Cntrl BMPs Surce Cntrl BMPs reduce the ptential fr strmwater runff and pllutants frm cming int cntact with ne anther. Surce Cntrl BMPs are defined as any administrative actin, design f a structural facility, usage f alternative materials, and peratin, maintenance, inspectin, and cmpliance f an area that aims t eliminate r reduce strmwater pllutin. This Mdel WQMP categrizes Surce Cntrl BMPs as either Structural r Nn-Structural Surce Cntrl BMPs. Surce Cntrl BMPs are required within all Pririty Develpment Prjects unless they d nt apply due t the prject characteristics. The fllwing list f Structural and Nn-Structural Surce Cntrl BMPs are numbered fr purpses f the Orange Cunty Strmwater Prgram and Mdel WQMP, fllwed by a crss-reference fr the CASQA BMP Handbk reference number in parenthesis, where applicable, fr general guidance fr implementing the BMPs that apply t the prject. Additinal infrmatin fr each BMP is cntained within TGD Sectin 6. Where BMP fact sheets in the TGD specify selectin and/r design criteria, the applicable selectin and/r design criteria must be used. 7.II Structural Surce Cntrl BMPs S1 Prvide Strm Drain System Stenciling and Signage (CASQA BMP Handbk SD-13) S2 Design Outdr Hazardus Material Strage Areas t Reduce Pllutant Intrductin (CASQA BMP Handbk SD-34) S3 Design Trash Enclsures t Reduce Pllutant Intrductin (CASQA BMP Handbk SD-32) S4 Use Efficient Irrigatin Systems and Landscape Design (CASQA BMP Handbk SD-12) S5 Prtect Slpes and Channels S6 Lading Dck Areas (CASQA BMP Handbk SD-31) S7 Maintenance Bays and Dcks (CASQA BMP Handbk SD-31) S8 Vehicle Wash Areas (CASQA BMP Handbk SD-33) S9 Outdr Prcessing Areas (CASQA BMP Handbk SD-36) S10 Equipment Wash Areas S11 Fueling Areas (CASQA BMP Handbk SD-30) City f Laguna Beach Mdel WQMP 7.II 2-14 December 20, 2013

28 S12 Site Design and Landscape Planning (Hillside Landscaping) (CASQA BMP Handbk SD-10) S13 Wash Water Cntrls fr Fd Preparatin Areas S14 Cmmunity Car Wash Racks 7.II Nn- Structural Surce Cntrl BMPs N1 Educatin fr Prperty Owners, Tenants and Occupants N2 Activity Restrictins N3 Cmmn Area Landscape Management (CASQA BMP Handbk SC-73) N4 BMP Maintenance N5 Title 22 CCR Cmpliance N6 Lcal Water Quality Permit Cmpliance N7 Spill Cntingency Plan (CASQA BMP Handbk SC-11) N8 Undergrund Strage Tank Cmpliance N9 Hazardus Materials Disclsure Cmpliance N10 Unifrm Fire Cde Implementatin N11 Cmmn Area Litter Cntrl (CASQA BMP Handbk SC-60) N12 Emplyee Training N13 Husekeeping f Lading Dcks (CASQA BMP Handbk SD-31) N14 Cmmn Area Catch Basin Inspectin (CASQA BMP Handbk SC-74) N15 Street Sweeping Private Streets and Parking Lts (CASQA BMP Handbk SC-43, SC-70) 7.II Nn-Structural Surce Cntrl Measures fr Public Agency Prjects In additin t the abve list f nn-structural surce cntrl measures that apply t all prjects, when Public Agency Pririty Develpment Prjects are cmpleted, the surce cntrl measures and maintenance measures described in DAMP Sectin 5, Municipal Activities, shall be implemented t maintain the prjects. City f Laguna Beach Mdel WQMP 7.II 2-15 December 20, 2013

29 7.II 3.0 Alternative Cmpliance Appraches fr LID Nte: This sectin cmprises the LID BMP Waiver Prgram as required per F.1.d.(7) f the Suth Orange Cunty Permit until it is superseded in whle r part by a separate r supplemental Waiver Prgram develped by the cpermittees, cllectively r individually, at a future pint in time. Nte: This sectin des nt cnsider alternative cmpliance fr hydrmdificatin cntrl. Fr alternative cmpliance fr hydrmdificatin cntrl, if available, refer t Appendix C (and any supprting dcuments referenced frm Appendix C). This sectin describes alternative cmpliance appraches fr LID criteria fr prpsed prjects that are nt able t fully capture and infiltrate, harvest and use, r bifilter the design capture vlume in ne f the fllwing ways: Using a cmbinatin f site design and n-site LID BMPs. Develpment prjects greater than 100 acres in ttal prject size r smaller than 100 acres in size yet part f a larger cmmn plan f develpment that is ver 100 acres, that have been prepared using watershed and/r sub-watershed based water quality, hydrlgic, and fluvial gemrphlgic planning principles that implement reginal LID BMPs cnsistent with an apprved watershed scale apprach (See Sectin 7.II ). If it is demnstrated t be technically infeasible meet the LID requirements summarized abve, a request fr waiver f n-site LID requirements must be submitted by the prject prpnent. Waivers are discussed in Sectin 7-II-3.1. As part f the waiver prgram, an alternative cmpliance plan must be develped t address the remainder f the pllutants brne in the design capture vlume that is nt treated using LID BMPs either n r ff site. The Prject WQMP must demnstrate that the alternative cmpliance plan will nt result in a net impact (after cnsideratin f treatment cntrl BMPs, mitigatin, and in-lieu payments) frm pllutant ladings ver and abve the impacts caused by prjects meeting the LID requirements. Sme prjects may qualify fr Water Quality Credits that can be applied t reduce r fully satisfy the remaining design capture vlume that must be treated befre evaluating alternative appraches. Water Quality Credits are discussed in Sectin 7.II-3.2. After adjusting the remaining bligatins t accunt fr water quality credits, if applicable, alternative cmpliance plans may include ne r mre f the fllwing elements: Implement reginal/sub-reginal LID slutins, if feasible, fllwing the LID selectin hierarchy (i.e., retain then bifilter) fr the remaining design capture vlume. Implement n-site structural treatment cntrls (treatment cntrl BMPs) fr the remaining design capture vlume, and implement ne r mre f the fllwing appraches t mitigate fr pllutant lads assciated with the remaining DCV nt remved via treatment cntrl BMPs: Implement an ff-site mitigatin prject, and/r City f Laguna Beach Mdel WQMP 7.II 3-1 December 20, 2013

30 Cntribute t a strmwater mitigatin fund. A flw chart illustrating the key steps fr develping an alternative cmpliance plan apprach fr the SOC Permit Area is shwn in Figure 7.II-7. The fllwing sectins describe the elements f an alternative cmpliance plan in greater detail, including Waivers, Water Quality Credits, Treatment Cntrl BMPs, Urban Runff Funds / Mitigatin Prgrams, and Off-Site Mitigatin. Figure 7.II-7: Alternative Prgram Flw Chart fr Suth Orange Cunty Nte: Mdel WQMP sectins shwn in red City f Laguna Beach Mdel WQMP 7.II 3-2 December 20, 2013

31 7.II 3.1 Waivers Fr prject prpnents in the SOC Permit Area, a Waiver Request is required if it is technically infeasible t cmpletely satisfy LID requirements thrugh the implementatin f n-site LID BMPs. Permittees in Suth Orange Cunty must develp, cllectively r individually, a LID Waiver Prgram fr incrpratin int lcal SSMPs meeting the requirements f Sectin d(7) f the permit. A waiver applicatin fr an alternative cmpliance plan in accrdance with the adpted prgram must be submitted fr Permittee apprval fr each prject, which will be reprted t the San Dieg Reginal Water Quality Cntrl Bard within the Permittee s annual strmwater prgram reprt. [Nte: Sectin 7.II-3.0 f this Mdel WQMP cmprises the LID BMP Waiver Prgram as required per F.1.d.(7) f the Suth Orange Cunty Permit until it is superseded in whle r part by a separate r supplemental Waiver Prgram develped by the cpermittees, cllectively r individually, at a future pint in time.] Each lcal jurisdictin is t use the feasibility criteria described in TGD Sectin t evaluate if Waiver Requests have adequately dcumented infeasibility. Each jurisdictin will identify in its Lcal Implementatin Plan (LIP) r Jurisdictinal Urban Runff Management Plan the individual(s) r psitin(s) that is (are) authrized t review and apprve Waivers. Prject prpnents that have been granted a waiver must cmply with requirements fr the alternative cmpliance plan prpsed by the Prject Prpnent and apprved by the Permittee fr the prpsed prject t mitigate ptential negative impacts n the watershed due t the infeasibility f fully implementing LID BMPs. 7.II 3.2 Water Quality Credits 7.II Type f Prject Ptentially Qualifying fr Water Quality Credits Fr certain types f develpment prjects, LID BMPs may be mre difficult t incrprate due t the nature f the develpment, but the develpment practices may prvide ther envirnmental benefits t cmmunities. Fr example, infiltratin BMPs may nt desirable fr a Brwnfield redevelpment site where infiltrated strmwater culd cause an adverse impact t grundwater supply, but redevelpment f the site wuld be expected t have ther envirnmental benefits such as accelerated site cleanup. Develpment in city centers, histric districts, r histric preservatin areas ften fllws land-use patterns that existed befre the intrductin f the autmbile and subsequent urban sprawl. New develpment r redevelpment in these areas is expected t fllw thse same patterns in rder t be cmpatible with the surrunding area and thereby mimic many LID principles, while ptentially reducing the number f vehicle miles traveled and assciated water pllutin. In additin, redevelpment prjects culd be implemented in a way that reduces the verall impervius ftprint f the prject site rather than increasing it. Lcal jurisdictins may develp a water quality credit prgram that applies t certain types f develpment prjects after they first evaluate the feasibility f meeting LID requirements n-site. In rder t determine if a prject falls int any f the fllwing categries, lcal jurisdictins will use the descriptins prvided belw as well as City f Laguna Beach Mdel WQMP 7.II 3-3 December 20, 2013

32 descriptins r definitins in lcal planning dcuments. If any f these descriptins r definitins is inadequate t determine a prject s eligibility fr credits, lcal jurisdictins will use published and generally accepted descriptins r definitins. If it is nt feasible t meet the requirements fr n-site LID, prject prpnents fr specific prject types can apply credits that wuld reduce prject bligatins fr selecting and sizing ther treatment BMPs r participating in ther alternative prgrams. Credits can be applied nly as part f the LID Waiver Prgram. Prjects ptentially eligible fr cnsideratin fr credits include: Redevelpment prjects that reduce the verall impervius ftprint f the prject site; Brwnfield redevelpment, meaning redevelpment, expansin, r reuse f real prperty which may be cmplicated by the presence r ptential presence f hazardus substances, pllutants r cntaminants, and which have the ptential t cntribute t adverse grund r surface water quality if nt redevelped; Higher density develpment prjects which include tw distinct categries (credits can nly be taken fr ne categry): Thse with mre than seven units per acre f develpment (lwer credit allwance); Vertical density develpments, fr example, thse with a Flr t Area Rati (FAR) f 2, r thse having mre than 18 units per acre (greater credit allwance); Mixed use develpment, such as a cmbinatin f residential, cmmercial, industrial, ffice, institutinal, r ther land uses which incrprate design principles that can demnstrate envirnmental benefits that wuld nt be realized thrugh single use prjects (e.g., reduced vehicle trip traffic with the ptential t reduce surces f water r air pllutin); Transit-riented develpments, such as a mixed use residential r cmmercial area designed t maximize access t public transprtatin; similar t abve criterin, but where the develpment center is within ne half mile f a mass transit center (e.g., bus, rail, light rail r cmmuter train statin). Such prjects wuld nt be able t take credit fr bth categries, but may have greater credit assigned; Redevelpment prjects in an established histric district, histric preservatin area, r similar significant city area including cre City Center areas (t be defined thrugh mapping); Develpments with dedicatin f undevelped prtins t parks, preservatin areas, and ther pervius uses; Develpments in a city center area; Develpments in histric districts r histric preservatin areas; City f Laguna Beach Mdel WQMP 7.II 3-4 December 20, 2013

33 Live-wrk develpments, a variety f develpments designed t supprt residential and vcatinal needs tgether similar t criteria t mixed use develpment; wuld nt be able t take credit fr bth categries; and Infill prjects, the cnversin f empty lts and ther underused spaces int mre beneficially used spaces, such as residential r cmmercial areas. These categries address ther types f alternative pprtunities r cmpliance appraches that are described in ther sectins f this MWQMP. This prvisin des nt exempt the prject prpnent frm first cnducting the investigatins t determine if is feasible t fulfill the full LID, treatment cntrl, and hydrmdificatin requirements thrugh a cmbinatin f site design practices and LID BMPs cnsistent with the permit hierarchy. These credits are nt applicable t hydrmdificatin requirements. 7.II Applying Water Quality Credits t LID Perfrmance Criteria T determine the amunt f credit a prject wuld qualify fr, the first step is t calculate the vlume that wuld need t be satisfied in the absence f any credits as described in Sectin 7.II-3.2. Any credits wuld then be taken as a reductin t this remaining vlume. The credits wuld be calculated in ne f tw ways: Fr redevelpment prjects that reduce the verall impervius ftprint f the prject site cmpared t current use, the credits wuld be calculated as fllws: Calculate an equivalent existing Design Capture Vlume fr the site (DCV E ) using the LID BMP Perfrmance Criteria defined in Sectin 7.II and current site cnditins Calculate the full Design Capture Vlume fr the site under the prpsed develpment plan (DCV p ) Subtract t btain a credit vlume: (DCV E ) - (DCV p ) = Credit Vlume Fr all ther categries f prjects nted abve, the remaining vlume t be treated r mitigated wuld be reduced in accrdance with the fllwing prtins f the riginal design capture vlume : Histric district, histric preservatin area, r similar areas 10 percent Brwnfield redevelpment 25 percent Higher density develpment 7 units/acre 5 percent Vertical density 20 percent Mixed use develpment, transit riented develpment r live-wrk develpment 20 percent Infill develpment 10 percent If mre than ne categry applies t a particular prject, the credit percentages wuld be additive up t a 50 percent reductin (50 percent reductin maximum). Applicable perfrmance criteria depend n the number f LID water quality credits claimed by the City f Laguna Beach Mdel WQMP 7.II 3-5 December 20, 2013

34 prpsed prject. The vlume credit wuld be calculated as the riginal design capture vlume f the prpsed cnditin (befre accunting fr the retentin and bifiltratin achieved n-site) multiplied by the sum f the percentages claimed abve. This credit (expressed as a vlume) is subtracted frm the prpsed prject s remaining alternative cmpliance bligatins. If the credit vlume exceeds the remaining vlume that culd nt be prvided in n-site LID, there are n further alternative cmpliance bligatins. 7.II 3.3 Treatment Cntrl BMPs This sectin cntains perfrmance criteria fr treatment cntrl BMPs. Nte that satisfactin f LID perfrmance criteria als fully satisfies treatment cntrl perfrmance criteria, therefre this sectin is nly applicable when the prject cannt fully retain r bifilter the design capture vlume, and must enter an alternative cmpliance prgram. 7.II Determine Treatment Cntrl BMP Water Quality Perfrmance Criteria This sectin cntains perfrmance criteria fr treatment cntrl BMPs when used as part f an alternative cmpliance plan. If LID perfrmance criteria have nt been met thrugh retentin and bifiltratin n-site r in a reginal LID BMP (per criteria in Sectin 7.II-3.5), the Prject shall participate in the LID Waiver Prgram (see Sectin 7.II- 3.1) and treatment cntrl BMPs shall be prvided prir t discharge t Waters f the US. Sizing f treatment cntrl BMP(s) shall be based n either: The unmet vlume as calculated in TGD Appendix VI. Treatment cntrl sizing, r If n cntrls have been prvided upstream f treatment cntrl BMPs, permitbased sizing criteria may be used: Capture and infiltrate, filter, r treat 80 percent f average annual runff vlume, OR Capture and infiltrate, filter, r treat the runff frm the 24-hur, 85th percentile strm event, as determined frm the Cunty f Orange s 85th Percentile Precipitatin Ispluvial Map and draw dwn the stred vlume in n mre than 48 hurs fllwing the end f precipitatin, OR Treat the maximum flw rate f runff prduced by the 85th percentile hurly rainfall intensity, as determined frm the lcal histrical rainfall recrd, multiplied by a factr f tw, OR The maximum flw rate f runff prduced frm a rainfall intensity f 0.2 inch f rainfall per hur, fr each hur f a strm event. City f Laguna Beach Mdel WQMP 7.II 3-6 December 20, 2013

35 By default, treatment cntrls BMPs are lcated prir t discharge f runff frm the prject site. Hwever, treatment cntrl BMPs can als be lcated at a sub-reginal r reginal scale, prvided that they meet the applicable criteria described in Sectin 7.II II Cmpute the Remaining Obligatin after Applying Treatment Cntrl BMPs The alternative cmpliance bligatins that must be prvided thrugh the LID Waiver Prgram (see Sectin 7.II- 3.1) shall be based n the difference between the pllutant lad reductin achieved by the prvided LID BMPs cmpared t the pllutant lad reductin that wuld result frm full implementatin f LID BMPs fr the design capture vlume. After applying treatment cntrl BMPs, tw ptins may be used t determine the amunt f LID bligatin that remains: 1) a vlume-based like-fr-like, equivalency determinatin, and (2) a quantitative pllutant-lad-based equivalency calculatin. In the vlume-based like-fr-like, equivalency apprach, the benefits f treatment cntrl BMPs are nt quantified. It is assumed that all remaining LID bligatins will be met with an ff-site mitigatin prgram r urban runff fund. The prject prpnent participates in an ff-site mitigatin prgram r urban runff fund fr the remaining vlume nt addressed by LID BMPs. Participatin in these prgrams is based n treating an equivalent vlume f runff frm like land uses with like pllutant lads. In the quantitative, pllutant lad-based equivalency apprach, the pllutant lad reductin achieved in treatment cntrl BMPs that are prvided per the criteria abve may cnstitute all r part f this alternative cmpliance bligatin. The pllutant lad reductin that is nt met thrugh a cmbinatin f LID and treatment cntrl must be prvided via an ff-site mitigatin prgram r urban runff fund such that the resulting discharge f pllutant lads is nt greater than wuld have been achieved via full implementatin f LID fr the design capture vlume. Equivalent lading calculatins shall be based n the pririty pllutant(s) f cncern, if present. If n pririty POCs exists, equivalent lading calculatins shall be based n all POCs and the mst stringent POC shall be used. Scientifically defensible infrmatin abut BMP perfrmance shall be used t calculate pllutant lad reductin achieved in treatment cntrl BMPs cmpared t full implementatin f LID BMPs and assumptins and ratinales shall be prvided in the Prject WQMP. Remaining bligatins t be met via ff-site mitigatin prjects r urban runff funds shall be expressed in terms f pllutant lads that must be reduced. 7.II 3.4 Urban Runff Funds / Mitigatin Prgrams and Off-Site Mitigatin Prjects 7.II Urban Runff Funds / Mitigatin Prgrams Fr prjects granted a LID BMP Waiver, participatin in an urban runff fund r mitigatin prgram is an ptin fr meeting remaining bligatins, in cmbinatin with treatment cntrl BMPs, as discussed in Sectin 7.II-3.3. Payment int an urban runff fund r mitigatin prgram can be used t address the runff vlume r pllutant lad that is nt addressed thrugh LID BMPs r ther alternative cmpliance ptins including treatment cntrl BMPs described abve. When an apprved urban runff fund r mitigatin prgram is available, participatin in the prgram is allwable as lng as the net effectiveness f the alternative prgram is the same r better than that City f Laguna Beach Mdel WQMP 7.II 3-7 December 20, 2013

36 which wuld have been achieved with n-site cmpliance. The fllwing sectin describes a general basis and criteria fr develping such prgrams. Hwever, a specific prgram with established quantitative criteria and cst basis has nt been established. It is expected that the Permittees will develp a specific prgram and submit this t the Executive Officer fr future review and apprval t allw specific prjects t use this apprach. Payment int a runff fund r mitigatin prgram is an alternative t ff-site mitigatin, but must include implementing n-site treatment cntrls. The amunt f the cntributin will be based n the unmet difference between the pllutant lad reductin that wuld be achieved thrugh full cmpliance with n-site LID BMPs and the actual pllutant lad reductin that can be achieved thrugh the cmbinatin f LID practices and treatment cntrl BMPs that can be incrprated in the prject. The basis fr determining the value f the cntributin will be determined by additinal future studies by the Permittees. The urban runff fund r mitigatin fund must be expended fr water quality imprvement r ther related prjects. Examples f prjects eligible fr funding thrugh an urban runff/mitigatin fund include, but are nt limited t: Green street prjects Prjects which retrfit f existing develpment areas with LID and ther BMPs t reduce existing pllutant lads Retrfit incentive prgrams Reginal BMPs/Sub-Reginal BMPs Stream restratin Prjects which prmte grundwater recharge t increase water supplies Other mitigatin prjects prpsed by Permittees 7.II Off-Site Mitigatin Prjects Fr prjects granted a LID BMP Waiver, an ff-site mitigatin prject r alternative pllutant-reducing prject may be cnsidered t meet remaining bligatins after claiming applicable water quality credits and prviding treatment cntrl BMPs. The prject is nt required t be upstream frm the ff-site mitigatin, but the ff-site mitigatin must be implemented within the same hydrlgic subarea as the prpsed prject. Off-site mitigatin prjects utside f the hydrlgic subarea but within the same hydrlgic unit may be develped fr Permittee apprval prvided that the prject prpnent demnstrates that mitigatin prjects within the same hydrlgic subarea are infeasible and that the mitigatin prject will address similar beneficial use impacts as expected frm the prpsed prject s pllutant lad types and amunt. Offsite prject BMPs shuld be lcated as clse as pssible t the prject site and shuld generally address a similar mix f land uses t that prpsed by the prject. The ff-site prject shall nt be lcated within waters f the US and it shall be demnstrated that equivalent pllutant remval is accmplished prir t discharge t waters f the US. Off-site mitigatin prjects may demnstrate equivalent pllutant lad reductin using a City f Laguna Beach Mdel WQMP 7.II 3-8 December 20, 2013

37 vlume-based apprach when treating a like land use, r via a quantitative pllutant lad-based equivalency apprach when addressing a different land use type, as discussed in Sectin 7.II Off-site mitigatin prjects may include, but are nt limited t: Green streets prjects Existing develpment retrfit prjects Retrfit incentive prgrams Reginal BMPs Grundwater recharge prgrams Stream restratin Other ff-site mitigatin techniques may be prpsed t the Permittee fr review and apprval. 7.II 3.5 Use f Sub-Reginal r Reginal BMPs as Part f Alternative Cmpliance Where it is nt feasible t prvide LID BMPs fr the entire design capture vlume nsite and the prject has submitted a waiver request, sub-reginal r reginal LID BMPs can be prpsed as an alternative cmpliance apprach fr the remaining design capture vlume. These types f BMPs are based n the LID principles f strmwater retentin r bifiltratin, but are lcated beynd the bundaries f the specific develpment prject, and may address several develpments within the same watershed r multiple adjacent develpments within the same watershed. A sub-reginal LID BMP, selected per the LID selectin hierarchy described in Sectin 7.II and with capacity allcated fr the remaining design capture vlume frm a prject, fully meets alternative cmpliance bligatins fr the prject. The ptential availability f reginal r sub-reginal LID BMP pprtunities culd be identified as part f a planning prcess undertaken by the apprpriate jurisdictins and prject prpnents. Fr this apprach t be cnsidered, the Prject WQMP r an assciated planning dcument must demnstrate that reginal LID BMP will meet the fllwing criteria: The sub-reginal/reginal BMP is lcated such that the prject wuld drain t the BMP prir t discharge t a Waters f the US, the net pllutant remval lad within the watershed is equivalent t what wuld be accmplished n-site, r wuld nt impair the beneficial uses f Waters f the US. The sub-reginal/reginal BMP is sufficiently sized t treat strmwater runff frm its tributary area, t the extent needed t address vlume that is nt met nsite. The sub-reginal/reginal BMP is sited and designed such that it will prvide equal r greater verall pllutant lad reductin than wuld be achieved by LID BMPs n-site as described in TGD Sectin City f Laguna Beach Mdel WQMP 7.II 3-9 December 20, 2013

38 The sub-reginal/reginal BMP will be adequately maintained fr the life f the prject and the sub-reginal/reginal BMP will be cnstructed and peratinal t serve the prject prir t certificatin f ccupancy fr the prject. A sub-reginal r reginal BMP pprtunity that meets all f the abve criteria, but is a treatment cntrl BMP rather than an LID BMP, may be cnstructed t address the treatment cntrl criteria described in Sectin 7.II-3.3, but may nt fully address the remaining LID bligatins, unless demnstrated t be equivalent t the treatment prvided in LID BMPs via pllutant lad calculatins. City f Laguna Beach Mdel WQMP 7.II 3-10 December 20, 2013

39 7.II 4.0 BMP Maintenance Requirements A BMP Operatin and Maintenance (O&M) Plan must be prepared as part f the Prject WQMP (see DAMP Sectin 7.6.6) and a mechanism must be in place that will ensure nging lng-term maintenance f all structural BMPs. This mechanism may be prvided either thrugh the lcal jurisdictin under a maintenance agreement r ther mechanism, r by the prject prpnent as further described herein. As part f prject review, if a prject prpnent is required t include interim r permanent structural BMPs in prject plans, and if the lcal jurisdictin des nt prvide a mechanism fr BMP maintenance, the lcal jurisdictin shall require that the applicant describe an apprach t implement and maintain all BMPs included in apprved Prject WQMP thrugh such means as may be apprpriate, at the discretin f the lcal jurisdictin, including, but nt limited t cvenants, legal agreements, maintenance agreements, cnditinal use permits and/r funding arrangements. 7.II 4.1 Maintenance Mechanisms The fllwing are alternative mechanisms that may be used t prvide n-ging maintenance fr the BMPs included in the apprved Prject WQMP. Public entity maintenance: The lcal jurisdictin with the respnsibility fr WQMP apprval may apprve a WQMP that identifies a public r acceptable quasi-public entity (e.g., the City, the Cunty, r Cunty Fld Cntrl District, an existing assessment district, an existing utility district, r a cnservatin cnservancy) as assuming respnsibility fr peratin, maintenance, repair and replacement f the BMP. Unless therwise acceptable t individual lcal agencies, public entity maintenance agreements shall ensure estimated csts are frnt-funded r reliably guaranteed, (e.g., thrugh a trust fund, assessment district fees, bnd, letter f credit r similar means). In additin, the lcal jurisdictins may seek prtectin frm liability by apprpriate releases and indemnities. The Prject Prpnent must demnstrate that it will transfer the BMP maintenance t anther public entity subject t the fllwing prvisins. The Prject Prpnent will negtiate maintenance requirements with the entity that it is prpsing t accept maintenance respnsibilities within its jurisdictin; and negtiate with the resurce agencies respnsible fr issuing permits fr the cnstructin and/r maintenance f the facilities. If necessary, the public entity will als demnstrate thrugh the CEQA review r the public entity s public review prcess that it can accept the maintenance respnsibility. If a public entity is named as the respnsible maintenance entity, then the lcal jurisdictin must include that entity in its CEQA review prcess as a Respnsible Agency where applicable. The lcal jurisdictin must be identified as a third party beneficiary empwered t enfrce any such maintenance agreement within their respective jurisdictins. Prject prpnent agreement t maintain strmwater BMPs: The lcal jurisdictin may enter int a cntract with the prject prpnent bliging the prject prpnent t maintain, repair and replace the strmwater BMP as City f Laguna Beach Mdel WQMP 7.II 4-1 December 20, 2013

40 necessary int perpetuity. Security r a funding mechanism with a n sunset clause may be required. Assessment districts: The lcal jurisdictin may apprve an Assessment District r ther funding mechanism created by the prject prpnent t prvide funds fr strmwater BMP maintenance, repair and replacement n an nging basis. Any agreement with such a District shall be subject t the Public Entity Maintenance Prvisins abve. Lease prvisins: In thse cases where the lcal jurisdictin hlds title t the land in questin, and the land is being leased t anther party fr private r public use, the lcal jurisdictin may assure strmwater BMP maintenance, repair and replacement thrugh cnditins in the lease. Cnditinal use permits: Fr discretinary prjects nly, the lcal jurisdictin may assure maintenance f strmwater BMPs thrugh the inclusin f maintenance cnditins in the cnditinal use permit. Security may be required. Sme jurisdictins include requirements t implement apprved WQMPs in their municipal cde. Alternative mechanisms: The lcal jurisdictin may accept alternative maintenance mechanisms if such mechanisms are as prtective as thse listed abve. 7.II 4.2 Maintenance Requirements 7.II O&M Plan An Operatin and Maintenance Plan fr the BMPs will be prepared and included as Sectin 5 f the final Prject WQMP. The lcal jurisdictin shall ensure that the O&M plan, prepared by the prject prpnent satisfactry t the agency, is received prir t permit clseut and the issuance f certificates f use and ccupancy. The O&M Plan describes the designated respnsible party t manage the strmwater BMP(s), emplyee's training prgram and duties, perating schedule, maintenance frequency, rutine service schedule, specific maintenance activities, cpies f resurce agency permits, and any ther necessary activities. The final Prject WQMP shall require the prject prpnent r apprved maintenance entity t cmplete and maintain O&M frms t dcument all maintenance requirements. Parties respnsible fr the O&M plan shall retain recrds fr at least 5 years. These dcuments shall be made available t the lcal jurisdictin fr inspectin upn request at any time. 7.II O&M Cmmitments At a minimum, the final Prject WQMP shall require the inspectin and servicing f all structural BMPs n an annual basis. As part f the maintenance mechanism selected abve, the lcal jurisdictin shall require the inclusin f a cpy f an executed access easement within the final Prject WQMP that shall be binding n the land thrughut the life f the prject, until such time that the strmwater BMP requiring access is replaced, satisfactry t the lcal agency. City f Laguna Beach Mdel WQMP 7.II 4-2 December 20, 2013

41 7.II 4.3 Permit Clseut Requirements Fr discretinary prjects, the methd apprved by lcal jurisdictin fr strmwater BMP maintenance shall be incrprated int the prject's permit, and shall be cnsistent with permits issued by resurce agencies, if any. Just as with all ther aspects f a prject s apprved plans and designs, the lcal authrity will make a determinatin that all requirements f the Prject WQMP have been satisfactrily cmpleted prir t clseut f permits and issuance f certificates f use and ccupancy (see DAMP Sectin 7.6.6). Fr prjects requiring nly ministerial permits, the methd apprved by lcal jurisdictin fr strmwater BMP maintenance shall be shwn n the prject plans befre the issuance f any ministerial permits. Verificatin will ccur similar t discretinary prjects. In all instances, the prject prpnent shall prvide prf f executin f a methd apprved by lcal jurisdictin fr maintenance, repair, and replacement (O&M Plan See DAMP Sectin 5.3) befre the issuance f cnstructin apprvals, permit clseut and issuance f certificates f use and ccupancy. Fr all prperties, the verificatin mechanism includes the prject prpnent's signed statement, as part f the Prject WQMP, accepting respnsibility fr all structural BMP maintenance, repair and replacement r agreeing t an alternative mechanism that is apprved by the lcal authrity regarding maintenance, repair and replacement f the structural BMP. Lcal authrities implementing public prjects that are nt required t btain permits shall be respnsible fr ensuring that strmwater BMP maintenance, repair and replacement requirements are identified prir t the cmpletin f cnstructin and incrprated int the agency s Municipal Activities Prgram under the DAMP. City f Laguna Beach Mdel WQMP 7.II 4-3 December 20, 2013

42 7.II 5.0 WQMP Preparatin and Apprval The preceding sectins describe the requirements and prcess fr develping site design; selecting the apprpriate LID BMPs, ther BMPs, and/r identifying ther cmpliance appraches; and identifying the BMP maintenance requirements fr Pririty Develpment Prjects. This sectin describes the prcess fr dcumenting this infrmatin in a Cnceptual r Preliminary WQMP and/r Prject WQMP and fr submitting and btaining apprval f the Prject WQMP. Prject prpnents are strngly encuraged t incrprate LID and hydrmdificatin cntrl BMPs at the earliest cnceptual planning stages f a prject fr early review, t ptentially avid necessary prject changes and delays during the subsequent review and apprval prcess. Fr all prjects requiring discretinary r land use entitlement actins, a Cnceptual r Preliminary WQMP shuld be submitted as part f the applicatin fr prject apprval during the envirnmental review phase (CEQA) and must be submitted prir t relevant prject-level apprval f entitlements and Planning Cmmissin apprval f a prject r ther public hearing. The lcal jurisdictin will assure that a final Prject WQMP is submitted fr review and apprval prir t issuance f grading r building permits. The final Prject WQMP must be prepared by r under the directin f a Califrnia Registered Civil Engineer and affixed with their stamp unless specifically exempted frm this requirement by the Permittee. 7.II 5.1 Cnceptual r Preliminary WQMP Preparatin T facilitate early water quality planning and ensure that water quality prtectin and LID principles are cnsidered in the earliest phases f a prject, a the lcal jurisdictin will suggest that the prject prpnent prepare a Cnceptual r Preliminary WQMP prir t a cmplete r final Prject WQMP fr full review and apprval. A Cnceptual r Preliminary WQMP may be used by the lcal jurisdictin during the land use entitlement prcess r as part f a prject applicatin fr discretinary prject apprval. A Cnceptual r Preliminary WQMP supprts the CEQA prcess and prvides dcumentatin t supprt a checklist fr an Initial Study and Negative Declaratin r Mitigated Negative Declaratin, r serves as the basis fr the water quality sectin f an EIR. It shuld als serving as the basis fr the Lead Agency and Respnsible Agency t cnclude that the MEP standard is being met, by serving as the basis that selected BMPs will nt have the ptential t cause significant effects and/r that the effects have been mitigated, and are nt significant with mitigatin. The Cnceptual r Preliminary WQMP shuld t be circulated with the CEQA dcument r summarized within the circulated CEQA dcument. A WQMP Template has been prduced t assist prject prpnents with develping a Cnceptual r Preliminary WQMP (available at The level f detail in a Cnceptual r Preliminary WQMP can vary smewhat upn the level f detail knwn at the time discretinary prject apprval is sught, but must cntain at a minimum the fllwing infrmatin: Lcal prject identifier and descriptin (applicatin number, tentative tract number, review number, etc.) City f Laguna Beach Mdel WQMP 7.II 5-1 December 20, 2013

43 Site plan (tentative map, majr prject features, use exhibit, etc.) shwing the fllwing Prperty r prject bundaries Lcatins f buildings, landscaping, streets, curb and gutter, strm drainage system, and ther majr prject features Directin f surface drainage Existing easements Surface waters Areas f knwn r ptential hazards such as landfills, sil and grundwater cntaminatin, Alquist-Pril mapped fault znes, etc. Other prject features r activities that may generate pllutants such as wash racks, trash enclsures, fuelling areas, lading dcks, etc. Preliminary site assessment infrmatin Mst prximate and dwnstream receiving waters and any impairments Primary and ther POCs, and the related cnclusins that are t be made frm this infrmatin Identificatin f any hydrlgic cnditins f cncern and the supprting ratinale LID feasibility analysis results and supprting infrmatin Prpsed LID BMP selectin ratinale and supprting details and calculatins (r sub-reginal/reginal LID BMPs if applicable) Prpsed hydrmdificatin cntrl BMPs and calculatins Waiver request, if applicable Any prpsed prject specific credits r alterative cmpliance methds planned, and assciated ratinales and calculatins Preliminary Surce Cntrl BMP infrmatin Prpsed parties respnsible fr the lng-term peratin and maintenance f prpsed BMPs Prpsed funding mechanisms fr the lng-term peratin and maintenance f the prpsed BMPs The list f standard WQMP requirements as indicated earlier, including access easement, recrds t be kept, recrds retentin, inspectin frequencies, etc. Lcal jurisdictin staff will review and evaluate the Cnceptual / Preliminary Prject WQMP fr general acceptance and cnceptual r preliminary apprval, and will ffer guidance tward plan elements necessary fr apprval f the full Prject WQMP. Additinal infrmatin and submittals may be necessary fr cnceptual r preliminary apprval. It is the respnsibility f the prject prpnent t prvide the additinal infrmatin fr cnsideratin by the lcal jurisdictin. City f Laguna Beach Mdel WQMP 7.II 5-2 December 20, 2013

44 7.II 5.2 Final Prject WQMP Preparatin and Submittal A cmpleted Final Prject WQMP shuld fully address site design measures, LID BMPs, hydrmdificatin cntrls, surce cntrl BMPs, and treatment cntrl BMPs (where applicable t the prject) t address pllutants r hydrlgic cnditins f cncern. If the prject is participating in an alternative prgram such as a cntributin t a Runff Mitigatin Fund r Participatin in a Mitigatin Prgram, the Prject WQMP must describe and dcument the Prject s participatin. The Final Prject WQMP, when prepared fr submittal fr apprval, must be certified by the wner, and must include elements agreed upn at Cnceptual r Preliminary WQMP acceptance and any revisins prpsed. A WQMP Template has been prduced t assist prject prpnents with develping a Prject WQMP (available at The Final Prject WQMP must be cnsistent with the Cnceptual r Preliminary WQMP. If there are any substantial differences, the lcal jurisdictin must make a determinatin that the differences d nt diminish the effectiveness f the BMPs t mitigate r address the prject's ptential impacts t water quality. Furthermre, any changes must nt result in any new envirnmental impacts nt previusly disclsed in the lcal jurisdictin's circulated envirnmental dcument(s). If the changes diminish the prject's ability t mitigate r address its water quality impacts, r result in previusly undisclsed envirnmental impacts, the lcal jurisdictin shuld require that the prject be subject t further envirnmental review. Fr review and apprval, the cmpleted Prject WQMP must prvide the infrmatin described within this Mdel WQMP, including but nt limited t: Lcal prject identifier and descriptin (applicatin number, tentative tract number, review number, etc.) Site plan (tentative map, majr prject features, use exhibit, etc.) shwing the fllwing Prperty r prject bundaries Lcatins f buildings, landscaping, streets, curb and gutter, strm drainage system, and ther majr prject features Directin f surface drainage Existing easements Surface waters Areas f knwn r ptential hazards such as landfills, sil and grundwater cntaminatin, Alquist-Pril fault znes, etc. Other prject features r activities that may generate pllutants such as wash racks, trash enclsures, fuelling areas, lading dcks, etc. Site assessment infrmatin Mst prximate and dwnstream receiving waters and any impairments City f Laguna Beach Mdel WQMP 7.II 5-3 December 20, 2013

45 Primary and ther POCs and the related cnclusins that are t be made frm this infrmatin Identificatin f any hydrlgic cnditins f cncern and the supprting ratinale Cmpleted LID feasibility analysis, with findings, supprting ratinales, and references t supprting dcuments, as applicable LID BMP selectin ratinale and supprting details and calculatins (r subreginal/reginal LID BMPs if applicable) Hydrmdificatin cntrl BMPs and calculatins Surce Cntrl BMP infrmatin Identified parties respnsible fr the lng-term peratin and maintenance f prpsed BMPs Identified funding mechanisms fr the lng-term peratin and maintenance f the prpsed BMPs The list f standard WQMP requirements as indicated earlier, including access easement, recrds t be kept, recrds retentin, inspectin frequencies, etc. A waiver request, if applicable Any prpsed prject specific credits r alterative cmpliance methds utilized, and assciated ratinales and calculatins Prject specific credits taken t reduce the Design Strm Vlume If the prject is participating in a reginal r sub-reginal LID prject, cntributing t a Runff Mitigatin Fund, r participating in a Mitigatin Prject, dcumentatin and descriptin f the prgram, and the Prject s cntributin t the prgram. The cmpleted Prject WQMP is t be submitted t the lcal jurisdictin fr review and apprval. Any changes t WQMP elements agreed upn at the Cnceptual r Preliminary WQMP phase shuld be nted within the Prject WQMP submitted fr final apprval. Lcal jurisdictin staff will review the submittal fr acceptance and apprval. Reviews will be dcumented by the lcal jurisdictin. Additinal infrmatin and submittals may be necessary fr final apprval. It is the respnsibility f the prject prpnent t prvide the additinal infrmatin fr cnsideratin by the lcal jurisdictin. Once a prject reaches the plan check phase, the prject prpnent must submit a cmpleted Prject WQMP fr Pririty Develpment Prjects since the cnstructin plans submitted by the prject prpnent fr plan check must incrprate all f the structural BMPs identified in the Prject WQMP. Lcal jurisdictins may encurage (but nt necessarily require) prject prpnents t btain apprval f the prject s final Prject WQMP prir t submitting cnstructin plans fr plan check. Building r grading permits fr qualifying Pririty will nt be issued until the Prject WQMP has been submitted and apprved. City f Laguna Beach Mdel WQMP 7.II 5-4 December 20, 2013

46 The Prject WQMP will be stred within lcal jurisdictin files, and will cntinue with the prperty after the cmpletin f the cnstructin phase, and a lcal jurisdictin may require that the terms, cnditins and requirements be recrded with the Cunty Recrder s ffice by the prperty wner r any successive wner as authrized by the Water Quality Ordinance. In lieu f recrdatin, a lcal jurisdictin may require the Prject WQMP t include a Ntice f Transfer Respnsibility Frm, which serves t ntify the lcal jurisdictin that a change in wnership has ccurred and ntify the new wner f its respnsibility t cntinue implementing the Prject WQMP. 7.II 5.3 Lcatin Map, Plt Plan, and BMP Details The Prject WQMP shuld cntain a lcatin map shwing the prject site and surrundings in sufficient detail t allw the prject lcatin t be pltted n a base map. Prject prpnents shuld submit the plt plan with BMP details in electrnic drawing r GIS frmat. The Prject WQMP shuld als cntain a plt plan shwing prpsed imprvements t the prperty. The plt plan shall include the fllwing prject features: Each facility and its intended functin (if multiple facilities and uses are present nsite) Areas f utdr activities (if applicable) Applicable Structural Surce Cntrl BMPs and any Treatment Cntrl BMPs Drainage flw infrmatin Strm drain facilities Relatinship between nsite drainage and ffsite drainage The plt plan must cntain the fllwing labels: Title Blck Drainage Plt Plan Prject Name Address Owner Legend Nrth Arrw Scale The Prject WQMP shuld cntain plans and details related t the BMPs that will be included. 7.II 5.4 Educatinal Materials The Prject WQMP shuld reference standard educatinal materials that are applicable t the nature f the prject relating t the type f develpment and practices that may ccur n the site. Standard educatinal materials can be fund n the Orange Cunty City f Laguna Beach Mdel WQMP 7.II 5-5 December 20, 2013

47 Watersheds website at and referenced in the Prject WQMP. Any materials that are specific t the prject and nt included in the standard materials must be included in the Prject WQMP. City f Laguna Beach Mdel WQMP 7.II 5-6 December 20, 2013

48 7.II 6.0 Resurces and References Additinal infrmatin can be btained within the fllwing references. Lw Impact Develpment Manual fr Suthern Califrnia: Technical Guidance and Site Planning Strategies Strmwater C.3 Guidebk: Strmwater Quality Requirements fr Develpment Applicatins, Furth Editin Better Site Design: A Handbk fr Changing Develpment Rules in Yur Cmmunity (1998) Presents guidance fr different mdel develpment alternatives. Green Streets: A Cnceptual Guide t Effective Green Streets Design Slutins Califrnia Assciatin f Strmwater Quality Agencies (CASQA) Lw Impact Develpment Prtal Califrnia Urban Runff Best Management Practices Handbks (1993) fr Cnstructin Activity, Municipal, and Industrial/Cmmercial Presents a descriptin f a large variety f Structural BMPs, Treatment Cntrl, BMPs and Surce Cntrl BMPs Caltrans Urban runff Quality Handbk: Planning and Design Staff Guide (Best Management Practices Handbks (1998) Presents guidance fr design f urban runff BMPs Design and Cnstructin f Urban Strmwater Management Systems, American Sciety f Civil Engineers (ASCE) Manuals and Effect f urban sil cmpactin n infiltratin rate; Gregry, J.H.; Dukes, M.D.; Jnes, P.H.; and G.L. Miller, Reprts n Engineering Practice N. 77/ Water Envirnment Federatin (WEF) Manual f Practice FD-20, Califrnia State Water Resurces Cntrl Bard and Lw Impact Develpment Center, 2009 Cntra Csta Clean Water Prgram, September 10, 2008 Center fr Watershed Prtectin 8391 Main Street Ellictt City, MD USEPA, t.aspx Ls Angeles Cunty Department f Public Wrks Cashiers Office 900 S. Fremnt Avenue Alhambra, CA Califrnia Department f Transprtatin P.O. Bx Sacrament, CA ASCE Jurnal f Sil and Water Cnservatin (3): WEF City f Laguna Beach Mdel WQMP 7.II 6-1 December 20, 2013

49 Design Manual fr Use f Biretentin in Strmwater Management (1993) Presents guidance fr designing biretentin facilities. Design f Strmwater Filtering Systems (1996) by Richard A. Claytr and Thmas R. Schuler Presents detailed engineering guidance n ten different urban runff-filtering systems. Develpment Planning fr Strmwater Management, A Manual fr the Standard Urban Strmwater Mitigatin Plan (SUSMP), (May 2000) Flrida Develpment Manual: A Guide t Sund Land and Water Management (1988) Presents detailed guidance fr designing BMPs Guidance Manual fr On-Site Strmwater Quality Cntrl Measures, Sacrament Strmwater Management Prgram. Guidance Specifying Management Measures fr Surces f Nnpint Pllutin in Castal Waters (1993) Reprt N. EPA 840-B Prvides an verview f, planning and design cnsideratins, prgrammatic and regulatry aspects, maintenance cnsideratins, and csts. Guide fr BMP Selectin in Urban Develped Areas (2001) Lw-Impact Develpment Design Strategies - An Integrated Design Apprach (June 1999) Maryland Strmwater Design Manual (1999) Presents guidance fr designing urban runff BMPs Prince Gerge s Cunty Watershed Prtectin Branch 9400 Peppercrn Place, Suite 600 Landver, MD Center fr Watershed Prtectin 8391 Main Street Ellictt City, MD Ls Angeles Cunty Department f Public Wrks r Flrida Department f the Envirnment 2600 Blairstne Rad, MailStatin 3570 Tallahassee, FL City f Sacrament Department f Utilities and Cunty f Sacrament Water Resurces Divisin. January Natinal Technical Infrmatin Service US Department f Cmmerce Springfield, VA ASCE Envir. and Water Res. Inst Alexander Bell Dr. Restn, VA (800) Prince Gerge s Cunty, Maryland Department f Envirnmental Resurce Prgrams and Planning Divisin 9400 Peppercrn Place Larg, Maryland PPD/pgcunty/lidmain.htm Maryland Department f the Envirnment 2500 Brening Highway Baltimre, MD Methdlgy fr Analysis f Detentin Basins fr Cntrl f Urban Runff Quality, Envirnmental Prtectin Agency (EPA-440/ ). City f Laguna Beach Mdel WQMP 7.II 6-2 December 20, 2013

50 Natinal Strmwater Best Management Practices (BMP) Database, Versin 1.0 Prvides data n perfrmance and evaluatin f urban runff BMPs Natinal Strmwater Best Management Practices Database (2001) Operatin, Maintenance and Management f Strmwater Management (1997) Prvides a thrugh lk at strmwater practices including, planning and design cnsideratins, prgrammatic and regulatry aspects, maintenance cnsideratins, and csts. Ptential Grundwater Cntaminatin frm Intentinal and Nn-Intentinal Strmwater Infiltratin Preliminary Data Summary f Urban runff Best Management Practices (August 1999) EPA-821-R Reference Guide fr Strmwater Best Management Practices (July 2000) Secnd Nature: Adapting LA s Landscape fr Sustainable Living (1999) by Tree Peple Detailed discussin f BMP designs presented t cnserve water, imprve water quality, and t achieve fld prtectin. Site Planning fr Urban Stream Prtectin, Department f Envirnmental Prgrams, Metrplitan Washingtn Cuncil f Gvernments Start at the Surce (1999) Detailed discussin f permeable pavements and alternative driveway designs presented. Strmwater, Grading and Drainage Cntrl Cde, Seattle Municipal Cde Sectin , and Directr s Rules, Vlumes 1-4. (Ordinance , effective July 5, 2000) American Sciety f Civil Engineers 1801 Alexander Bell Drive Restn, VA Urban Water Resurces Research Cuncil f ASCE Wright Water Engineers, Inc. (303) Watershed Management Institute, Inc. 410 White Oak Drive Crawfrdville, FL Reprt N. EPA/600/R-94/051, USEPA (1994). City f Ls Angeles Urban runff Management Divisin 650 Suth Spring Street, 7th Flr Ls Angeles, Califrnia Tree Peple Mullhlland Drive Beverly Hills, CA (818) Fax (818) Bay Area Strmwater Management Agencies Assciatin 2101 Webster Street Suite 500 Oakland, CA City f Seattle Department f Design, Cnstructin & Land Use 700 5th Avenue, Suite 1900 Seattle, WA (206) ccde.htm City f Laguna Beach Mdel WQMP 7.II 6-3 December 20, 2013