This appedix provides examples of the use of the Threat-to-Water Quality (TTWQ) methodology discussed i the 2011 Log-Term Effectiveess Assessmet (LTEA) Sectio 4. All of the examples preseted i this appedix, although may iclude some real data ad iformatio, are fictioal i ature ad are iteded to be for example purposes oly. The tables preseted i this appedix are provided i electroic form o the accompayig 2011 LTEA compact disc. The compact disc also cotais template (blak) forms for use i coductig the TTWQ methods. The imagery for the examples are take from the watershed iteractive mappig i the 2011 LTEA Water Quality Report icluded as Attachmet 1 to the 2011 LTEA. The aerial imagery is from Google Earth ad icludes overlays from City of Sa Diego storm drai mappig ad hydrologic areas the data ad iformatio preseted i these images are ot ecessarily accurate or correct, but are preseted as examples oly. The plots ad tables i the examples below, illustrate a process i which the TTWQ i a particular watershed is aalyzed by usig available data ad iformatio to prioritize sources. The primary approaches to the TTWQ process are preseted for two moitorig locatios i the Peñasquitos watershed. Four examples are provided: 1) Sigle Pollutat Approach o Large Area Scale (MLS/TWAS) 2) Multi-Pollutat Approach o Large Area Scale (MLS/TWAS) 3) Sigle Pollutat Approach o Small Area Scale (MLS/TWAS) 4) Ivestigative Method usig TTWQ Approach (MS4 Outfall) As discussed i Sectio 4 of the LTEA, the methodologies for the sigle ad multi-pollutat approaches are listed below: Steps for Sigle Pollutat Approach to TTWQ 1) Determie Scale to Develop Threat to Water Quality a. Regioal b. Hydrologic Area c. Hydrologic Subarea d. Tributary Area e. Jurisdictioal 2) Determie Wet or Dry Weather Coditios 3) Determie Water Quality Issues (Pollutat(s)) to Evaluate a. LTEA Water Quality Priorities (RW ad MS4) b. TMDLs c. 303(d) d. Special Studies 4) Associate Sources 1 to Pollutat a. Source SLPs b. PGA Associatios to Pollutats c. Special Studies 5) Icorporate Source Quatities 6) Icorporate Other as Desired 1 May iclude lad use as a source Appedix B-1
7) Develop Priority Rakig of Sources A multi-pollutat approach to TTWQ follows: 1) Perform Steps 1 ad 2 above 2) Repeat steps 3-6 above for each pollutat, each time idetifyig the priority rakig of sources for each pollutat. The first example is for a area that is tributary to a MLS i the Peñasquitos WMA ad demostrates a multi-pollutat approach to TTWQ. The mass loadig statio, LPC-MLS, is the moitorig locatio that captures a large tributary area spaig two Hydrologic Areas (HAs) i the watershed. Multi-Pollutat Large Area Scale TTWQ Approach 1) Determie Scale to Develop Threat to Water Quality Whe determiig the TTWQ, the first step is to determie the scale ad locatio where a particular moitorig locatio ca characterize the flow from a tributary area. For the example, Figures B-1 ad B- 2 show the Peñasquitos watershed ad the associated moitorig locatios, icludig MLS, TWAS, ad MS4 outfalls. For this example, the mass loadig statio LPC-MLS has bee chose because of its large tributary area. Figure B-1 shows the Los Peñasquitos Creek WMA dry weather urba ruoff ad receivig water base map. To see the tributary area to the LPC-MLS statio to be used i the example, Figure B-2 shows the draiage to the MLS throughout the watershed, which is tured o as oe of the map layers. The statio is ecircled i red o the maps i order to callout its locatio. 2) Determie Wet or Dry Weather Coditios The flow coditios should be selected at this poit. For the example, a dry weather coditio is selected. 3) Determie Water Quality Issues (Pollutat(s)) to Evaluate Usig Table 2-2 of the LTEA, the water quality issues are idetified by reviewig the watershed priority costituets preseted. This process idetifies the pollutats that are deemed a priority based o the water quality moitorig data. This step is coducted by reviewig the priorities table (LTEA Table 2-2) ad locatig the appropriate row cotaiig iformatio pertaiig to the moitorig locatio. Table B- 1 below shows the watershed priority costituets idetified for mass loadig statio LPC-MLS i the Peñasquitos WMA. The high priority costituets have bee highlighted to show a correspodig high score represeted i the data. The outcome of this step is Nutriets ad Bacteria/Pathoges as Dissolved Mierals (TDS) is ot a aalyte that is selected for Copermittee actio i this example due to its exus to groudwater ad/or imported water issues. 4) Associate Sources to Pollutat Usig the high priority costituets determied i the step above, the ext step is to review the fial source loadig potetials (SLPs) of sources withi the LPC-MLS tributary area that are likely sources cotributig to the selected pollutat(s). Usig the iformatio preseted i Sectio 3 (LTEA Table 3-10), the activities with source loadig potetial with regards to mass loadig statio LPC-MLS have bee highlighted based o the three high priority costituets (utriets ad bacteria/pathoges) see Table B-2 below for sources. Appedix B-2
Figure B-1: Los Peñasquitos Creek Moitorig Map Appedix B-3
Figure: B-2 Los Peñasquitos Creek Moitorig Map showig tributary draiage to Mass Loadig Statio LPC-MLS Appedix B-4
Metals Oil ad Grease Sedimet Pesticides Nutriets Bacteria/ Pathoges Dissolved Mierals Metals Oil ad Grease Sedimet Pesticides Nutriets Bacteria/ Pathoges Dissolved Mierals 2011 LTEA Threat-to-Water-Quality Examples Table B-1: Watershed Priority Costituets Determied by Water Quality Assessmet Moitorig Program at LPC-MLS Wet Dry WMA Sata Margarita River Sa Luis Rey Carlsbad Sa Dieguito Creek Los Peñasquitos Creek Missio Bay / La Jolla Sa Diego River Statio SMR-MLS - - M - - M - - - - - H - H SMR-MLS-2 - - H H - H - - - - - H - H SLR-MLS - - M M - H H - - M - H M H SLR-TWAS-1 - - H H - H H - - - - M H H LA-TWAS-1 - - H M - H - - - - - H M - BVC-TWAS-1 - - H H - H - - - - - H M H AHC-MLS - - H H - H H - - - - H H H AHC-TWAS-1 - - H H - H M - - - - H M H ESC-MLS - - H H - H H - - - - H H H ESC-TWAS-1 - - H H - H M - - - - H M H SDC-MLS - - M M - H H - - H - H M H SDC-TWAS-1 - - H H - M M - - - - H M H SDC-TWAS-2 - - H - H H M - - H - H H H LPC-MLS - - M M - H H - - - - H H H LPC-TWAS-1 - - H M - H M - - - - - H H LPC-TWAS-2 - - H H - H - - - - - H H H MB-TWAS-1 - - H H - H H - - - M M - H MB-TWAS-2 - - H H - H - - - - M H H - TC-MLS - - H H - H - - - - - H - - SDR-MLS - - H M - H - - - - - H H H SDR-TWAS-1 - - H H - H M - - - - H H H SDR-TWAS-2 - - H H - H - - - - - H M H SDR-TWAS-3 - - H H - H - - - - - M M H Sa Diego Bay - Pueblo CC-SD8-1 H - H H - H - H M M M H M - Sa Diego Bay - Sweetwater SR-MLS - - M M - H H - - - - H M H SR-TWAS-1 - - M M - H M - - - - H M H Sa Diego Bay - Otay OR-TWAS-1 M - M H - - M - - - - H - H Tijuaa River TJR-MLS - - H H H H - - - M - H H - TJR-TWAS-1 - - - - H M H - - - - - - - TJR-TWAS-2 - - H - H H - - - - - - - - Note: H=High Priority, M=Medium Priority pollutat based o the moitorig statio data. Gree cells represet the itersectio of the site locatio ad the high priority issues for dry coditios. Appedix B-5
Source Profile # Metals Oil & Grease Sedimet Pesticides Nutriets Bacteria/ Pathoges Dissolved Mierals Orgaics 2011 LTEA Threat-to-Water-Quality Examples Table B-2. Fial Source Loadig Potetials at LPC-MLS Activities with Source Loadig Potetial 1 Residetial Areas ad Activities L L L L L L L L 2 Costructio Sites > 1 acre UL UL L UL UL UL L UL 3 Costructio Sites < 1 acre UL UL L UL UL UL UL UL 4 Costructio Sites: ESA or hillside or sedimet TMDL UL UL L UL UL UL UL UL 5 Developmet subject to SUSMPs (> 5,000 sq. ft. impervious area) UK UK UK UK UK UK UL UK 6 Roads, streets, highways, ad parkig facilities L L L UL L L L L 7 MS4s - Catch Basis, Drai Ilets, Coveyace, Pump Statios N N L N N UK UL N 8 Corporate yards (icl. maiteace/storage yards) L L L UK UK UL UL L 9 Parks ad Recreatioal Facilities - parks, golf courses, cemeteries, etertaimet veues, etc. UK UK UK UK L UK UL UK 10 Auto Mechaical Repair, Maiteace, Fuelig, or Cleaig L L UL UL UK UL L L 11 Equipmet mechaical repair, maiteace, fuelig, or cleaig L L UL UL UK UL UL L 12 Automobile ad Other Vehicle Body Repair ad Paitig L L UL UL UL UL L L 13 Mobile automobile or vehicle washig L L L UL UL UL UL L 14 Mobile Power washig* UK UK UK UK UK UK UK UK 15 Auto parkig lots ad storage facilities L L L UK UK UK UL L 16 Retail or wholesale fuelig UK L UK N N N N L 17 Pest Cotrol Services N UK N L N UK N UK 18 Eatig or drikig establishmets N L UL UK UK L UL L 19 Mobile carpet, drape, or furiture cleaig N UK UL N UK UL N UL 20 Geeral cotractors for home/commercial improvemets UL UL L UL UL UL UL UL 21 Botaical or zoological gardes ad urseries/greehouses L UL L L L L UL UL 22 Mobile Ladscapig N UL L L L L UL N 23 Pool ad Foutai Cleaig N N N N UK N N UK 24 Marias L L N UK UK UK N UK 25 Aimal Keels N UL L UK L L N L 26 Buildig Materials Retail ad Storage L L L UL UL UL UL L 27 Chemical ad allied products UK UK UK UK UK UL N L 28 Fabricated metal L L UK UK UK UL UL L 29 Primary metal L UK UK UK UK UL N UK 30 Recyclig, Juk Yards, Scrap Metal L L L UL UL UL L L 31 Airfields UK UK UK UK UK N UL UK 32 Motor Freight L L UK UK UK UK UL L 33 POTWs (water ad wastewater) UK UK UK N UK L UL UK 34 Cocrete Maufacturig L L L UL UL UL UL L 35 Stoe/Glass Maufacturig L L L UL UL UL UL L 36 Food Maufacturig UL UL UL UL UL UL UL UL N = Noe, UK = Ukow, UL = Ulikely, L = Likely Appedix B-6
I additio to usig the SLPs, Copermittees ca also use PGA associatios to pollutats ad other special studies to associate sources to pollutat. 5) Icorporate Source Quatities After determiig the high priority pollutat costituets ad the source loadig potetials, idetify the umber of sources i the particular tributary/draiage area for the moitorig statio. For this exercise, it is recommeded that the Copermittees use the most up-to-date ivetory iformatio ad GIS software, if ecessary, to idetify a accurate umber of sources i the particular draiage area. Additioally, if it is available, the area of residetial lad use ad ay other pertiet lad use should be calculated. The sources withi the example draiage are show i Figure B-3. Oce these source umbers have bee compiled, cosolidate the results of the umber of sources, residetial acreage, ad source loadig potetial ito a table for the pollutats of cocer. See Tables B- 3 through B-5 for the high priority costituets at LPC-MLS. If oly usig a sigle-pollutat approach, follow up the sigle table with the prioritizatio. 6) Icorporate Other as Desired At this poit, the Copermittees should look to cosider other criteria that may be importat i decidig upo which sources are of greatest importace. Take from the LTEA (Sectio 4), the followig are additioal cosideratios. I selectig the source(s) to evaluate for the TTWQ, some additioal cosideratios the Copermittee(s) should evaluate are as follows: 1) Lad use (quatity ad activity) should be icluded ad the followig cosidered: a. Wet weather TTWQ processes should iclude a evaluatio of the lad use areas i the area of focus b. Need a surrogate value for residetial ad ope space lad areas to compare to ivetoried sources 2) Special studies iformatio regardig sources i the focus area 3) Potetial sources that are ot easily quatifiable icludig: bacterial regrowth i MS4 systems; erosio i ope space areas; accelerated erosio i creeks (hydromodificatio); ad aerial depositio For the purposes of this example, the residetial lad-use is idetified as beig of great importace. I order to compare the residetial lad acres to the umber of ivetoried sources, a coservative assumptio is made for this tributary watershed area average lot size of 0.5 acres, therefore each acres of residetial lad use equates to two (2) residetial uits. 7) Develop Priority Rakig of Sources For the multi-pollutat approach, the process combies the sigle-pollutat tables (Tables B-3 through B-5) ito a sigle master table where sources ca be raked o the basis of source loadig potetial ad umber of sources i the associated tributary watershed area. See Table B-6 for the results of the example process. Usig this process, ad the cosideratio that residetial areas are of great importace, the highest TTWQ source is the residetial areas i the tributary watershed area. Appedix B-7
Figure B-3. Los Peñasquitos Creek Moitorig Map showig tributary draiage ad potetial sources above Mass Loadig Statio LPC-MLS. Appedix B-8
Table B-3. Source Quatities, Water Quality Priority, ad SLPs for Bacteria/Pathoges at LPC-MLS. LPC-MLS Bacteria/Pathoges Water Source # Quality Loadig Source Sources Source Priority Potetial ID 1 Residetial Areas ad Activities 4,468 acres 8,936 L 2 Sites > 1 acre - L 3 Sites < 1 acre - UL 4 ESA or Hillside or Sedimet TMDL - UL 5 Developmet Subject to SUSMPs (> 5,000 sq. ft. Impervious Area) - UL 6 Roads, Streets, Highways, ad Parkig Facilities - UL 7 MS4s - Catch Basis, Drai Ilets, Coveyace, Pump Statios - UL 8 Corporate Yards (icl. Maiteace/Storage Yards) 2 UL 9 Parks ad Recreatioal Facilities - Parks, Golf Courses, Cemeteries, Etertaimet Veues, etc. 4 UL 10 Auto Mechaical Repair, Maiteace, Fuelig, or Cleaig 59 UL 11 Equipmet Mechaical Repair, Maiteace, Fuelig, or Cleaig - N 12 Automobile ad Other Vehicle Body Repair ad Paitig 3 UL 13 Mobile Automobile or Vehicle Washig - UL 14 Mobile Power Washig - N 15 Auto Parkig Lots ad Storage Facilities - UL 16 Retail or Wholesale Fuelig 35 N 17 Pest Cotrol Services - UL 18 Eatig or Drikig Establishmets 421 L H 19 Mobile Carpet, Drape, or Furiture Cleaig - UL 20 Geeral Cotractors for Home/Commercial Improvemets - UL 21 Botaical or Zoological Gardes ad Nurseries/Greehouses 3 L 22 Mobile Ladscapig - UL 23 Pool ad Foutai Cleaig - UL 24 Marias - UL 25 Aimal Keels, Horse Stables - UL 26 Offices with Osite ad Outdoor Storage Facilities - N 27 Buildig Materials Retail ad Storage - N 28 Chemical ad Allied Products - UL 29 Fabricated Metal - UL 30 Primary Metal - UL 31 Recyclig, Juk Yards, Scrap Metal - UL 32 Airfields - N 33 Motor Freight - UL 34 POTWs (Water ad Wastewater) 1 UL 35 Cocrete Maufacturig - N 36 Stoe/Glass Maufacturig - N 37 Food Maufacturig - UL N = Noe, UK = Ukow, UL = Ulikely, L = Likely Appedix B-9
Table B-4. Source Quatities, Water Quality Priority, ad SLPs for Nutriets at LPC-MLS. LPC-MLS Nutriets Water Source # Quality Loadig Source Sources Source Priority Potetial ID 1 Residetial Areas ad Activities 4,468 acres 8,936 L 2 Sites > 1 acre - L 3 Sites < 1 acre - UL 4 ESA or Hillside or Sedimet TMDL - UL 5 Developmet Subject to SUSMPs (> 5,000 sq. ft. Impervious Area) - UL 6 Roads, Streets, Highways, ad Parkig Facilities - L 7 MS4s - Catch Basis, Drai Ilets, Coveyace, Pump Statios - UL 8 Corporate Yards (icl. Maiteace/Storage Yards) 2 UL 9 Parks ad Recreatioal Facilities - Parks, Golf Courses, Cemeteries, Etertaimet Veues, etc. 4 UL 10 Auto Mechaical Repair, Maiteace, Fuelig, or Cleaig 59 L 11 Equipmet Mechaical Repair, Maiteace, Fuelig, or Cleaig - N 12 Automobile ad Other Vehicle Body Repair ad Paitig 3 UL 13 Mobile Automobile or Vehicle Washig - UL 14 Mobile Power Washig - N 15 Auto Parkig Lots ad Storage Facilities - UL 16 Retail or Wholesale Fuelig 35 N 17 Pest Cotrol Services - N 18 Eatig or Drikig Establishmets 421 L H 19 Mobile Carpet, Drape, or Furiture Cleaig - N 20 Geeral Cotractors for Home/Commercial Improvemets - UL 21 Botaical or Zoological Gardes ad Nurseries/Greehouses 3 L 22 Mobile Ladscapig - L 23 Pool ad Foutai Cleaig - N 24 Marias - UL 25 Aimal Keels, Horse Stables - UL 26 Offices with Osite ad Outdoor Storage Facilities - UL 27 Buildig Materials Retail ad Storage - N 28 Chemical ad Allied Products - UL 29 Fabricated Metal - UL 30 Primary Metal - UL 31 Recyclig, Juk Yards, Scrap Metal - UL 32 Airfields - N 33 Motor Freight - UL 34 POTWs (Water ad Wastewater) 1 UL 35 Cocrete Maufacturig - N 36 Stoe/Glass Maufacturig - N 37 Food Maufacturig - UL N = Noe, UK = Ukow, UL = Ulikely, L = Likely Appedix B-10
Table B-5. TTWQ Rakig of Multi-Pollutat Approach at LPC-MLS. LPC-MLS Source ID Source # Sources Source Loadig Potetial Bacteria Nutriets 1 Residetial Areas ad Activities 4,468 acres 8,936 L L 18 Eatig or Drikig Establishmets 421 L L 10 Auto Mechaical Repair, Maiteace, Fuelig, or Cleaig 59 UL L 16 Retail or Wholesale Fuelig 35 N N 21 Botaical or Zoological Gardes ad Nurseries/Greehouses 3 L L 12 Automobile ad Other Vehicle Body Repair ad Paitig 3 UL UL 9 Parks ad Recreatioal Facilities - Parks, Golf Courses, Cemeteries, Etertaimet Veues, etc. 4 UL UL 8 Corporate Yards (icl. Maiteace/Storage Yards) 2 UL UL 34 POTWs (Water ad Wastewater) 1 UL UL 2 Sites > 1 acre - L L 3 Sites < 1 acre - UL UL 4 ESA or Hillside or Sedimet TMDL - UL UL 5 Developmet Subject to SUSMPs (> 5,000 sq. ft. Impervious Area) - UL UL 6 Roads, Streets, Highways, ad Parkig Facilities - UL L 7 MS4s - Catch Basis, Drai Ilets, Coveyace, Pump Statios - UL UL 11 Equipmet Mechaical Repair, Maiteace, Fuelig, or Cleaig - N N 13 Mobile Automobile or Vehicle Washig - UL UL 14 Mobile Power Washig - N N 15 Auto Parkig Lots ad Storage Facilities - UL UL 17 Pest Cotrol Services - UL N 19 Mobile Carpet, Drape, or Furiture Cleaig - UL N 20 Geeral Cotractors for Home/Commercial Improvemets - UL UL 22 Mobile Ladscapig - UL L 23 Pool ad Foutai Cleaig - UL N 24 Marias - UL UL 25 Aimal Keels, Horse Stables - UL UL 26 Offices with Osite ad Outdoor Storage Facilities - N UL 27 Buildig Materials Retail ad Storage - N N 28 Chemical ad Allied Products - UL UL 29 Fabricated Metal - UL UL 30 Primary Metal - UL UL 31 Recyclig, Juk Yards, Scrap Metal - UL UL 32 Airfields - N N 33 Motor Freight - UL UL 35 Cocrete Maufacturig - N N 36 Stoe/Glass Maufacturig - N N 37 Food Maufacturig - UL UL Rakigs based o umber of sources/residetial acreage ad Source Loadig Potetials N = Noe, UK = Ukow, UL = Ulikely, L = Likely Appedix B-11
Sigle-Pollutat Small Area Scale TTWQ Approach The followig example uses a MS4 Outfall Statio ad its samplig results to illustrate the siglepollutat TTWQ approach o a smaller area scale. This example uses moitorig data from the 2011 LTEA Water Quality Report to idetify pollutats exceedaces above the water quality bechmarks. These costituets will the be used to determie the pollutat priority categories ad ultimately the high TTWQ sources. 1) Determie Scale to Develop Threat to Water Quality As with the multi-pollutat approach, the first step is to determie the scale ad locatio where a particular moitorig locatio ca characterize the flow from a tributary area. Figure B-4 shows the draiage area to the example MS4 outfall i the Peñasquitos watershed. 2) Determie Wet or Dry Weather Coditios The flow coditios should be selected at this poit. For the example, a wet weather coditio is selected. 3) Determie the Water Quality Issue (Pollutat) to Evaluate Determie water quality issues by reviewig the MS4 outfall moitorig data for the appropriate watershed. The idetify the pollutats that are high priority as a result of the water quality moitorig data. Ope the moitorig data table (icluded o LTEA compact disc- also derived from 2011 LTEA Water Quality Report) ad locate the appropriate row cotaiig ifo pertaiig to the moitorig locatio. Table B-7 shows the watershed priority costituets determied by the assessmet program for MS4 outfall LPC-02 i the Peñasquitos WMA. The moitorig data for the example MS4 outfall ad the high priority costituets have bee boxed i red to show a correspodig high score represeted i the data. 4) Associate Sources to Pollutat From Table B-7, Total Nitroge, Total Phosphorous, TDS, ad Eterococcus are cosidered high priority aalytes at MS4 moitorig statio LPC-02 as moitored durig both the wet ad dry seasos. These aalytes are the grouped ito oe of the ie priority pollutat categories as see i Table B-8. The correspodig high priority pollutats are show i Table B-8. Usig the high priority costituets determied i the step above, the ext step is to review the fial source loadig potetials (SLPs) of sources withi the LPC-MLS tributary area that are likely sources cotributig to the selected pollutat(s). Usig the iformatio preseted i Sectio 3 (LTEA Table 3-10), the activities with source loadig potetial with regards to mass loadig statio LPC-MLS have bee highlighted based o the three high priority costituets (utriets ad bacteria/pathoges) see Table B-9 below for sources. Appedix B-12
Figure B-4. Map of MS4-LPC-02 Moitorig Statio ad Draiage Area Appedix B-13
Table B-7. Watershed Priority Costituets determied by MS4 moitorig data at LPC-02 Aalyte Aalyte Statio Dry ad Wet HSA ph Nitrate as N Nitrate/Nitrite as N Nitrite as N Total Nitroge (calculated) Phosphorus, Total Total Suspeded Solids Total Dissolved Solids Fecal Coliform Eterococcus Ammoia-N Turbidity Copper (Cu), Dissolved Diazio MBAS 19 Dry 906.20 0 NA 0 NA 2 0% 0 NA 2 50% 2 50% 2 0% 2 100% 2 0% 2 0% 0 NA 0 NA 0 NA 0 NA 0 NA 105 Dry 906.20 0 NA 0 NA 2 0% 0 NA 2 100% 2 100% 2 0% 2 100% 2 100% 2 100% 0 NA 0 NA 0 NA 0 NA 0 NA 80024778 Wet 906.1 2 50% 1 0% 2 0% 1 0% 2 0% 2 0% 2 0% 2 50% 18A Dry 906.20 0 NA 0 NA 2 100% 0 NA 2 100% 2 50% 2 0% 2 100% 2 100% 2 100% 0 NA 0 NA 0 NA 0 NA 0 NA 21A Dry 906.20 0 NA 0 NA 2 0% 0 NA 2 100% 2 100% 2 0% 2 100% 2 100% 2 100% 0 NA 0 NA 0 NA 0 NA 0 NA DW017 Dry 906.10 0 NA 0 NA 0 NA 0 NA 0 NA 0 NA 2 0% 2 100% 2 0% 2 50% 0 NA 0 NA 0 NA 0 NA 0 NA DW018 Dry 906.20 1 0% 1 0% 0 NA 0 NA 2 50% 2 50% 2 0% 3 100% 3 33% 3 100% 1 0% 1 0% 0 NA 0 NA 1 0% DW021 Dry 906.10 0 NA 0 NA 0 NA 0 NA 0 NA 0 NA 2 0% 2 100% 2 50% 2 100% 0 NA 0 NA 0 NA 2 0% 0 NA DW025 Dry 906.10 0 NA 0 NA 0 NA 0 NA 2 100% 2 100% 2 0% 2 100% 2 50% 2 100% 0 NA 0 NA 2 0% 0 NA 0 NA DW026 Dry 906.10 0 NA 0 NA 0 NA 0 NA 0 NA 0 NA 2 0% 2 100% 2 0% 2 100% 0 NA 0 NA 2 50% 2 0% 2 0% DW027 Dry 906.10 0 NA 0 NA 0 NA 0 NA 0 NA 0 NA 2 0% 2 100% 2 50% 2 100% 0 NA 0 NA 0 NA 0 NA 0 NA DW247 Dry 906.20 0 NA 0 NA 0 NA 0 NA 2 100% 2 100% 2 0% 2 100% 2 50% 2 100% 0 NA 0 NA 0 NA 0 NA 0 NA DW289 Dry 906.10 0 NA 0 NA 0 NA 0 NA 2 100% 2 0% 2 0% 2 100% 2 50% 2 100% 0 NA 0 NA 0 NA 0 NA 0 NA DW391 Dry 906.20 0 NA 0 NA 0 NA 0 NA 2 100% 2 100% 2 0% 2 100% 2 100% 2 100% 0 NA 0 NA 0 NA 0 NA 0 NA DW428 Dry 906.10 0 NA 0 NA 0 NA 0 NA 0 NA 0 NA 2 50% 2 100% 2 50% 2 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-01-2008 Wet 906.2 1 0% 0 NA 1 0% 0 NA 1 0% 1 0% 1 0% 1 100% LPC-02-2009 Wet 906.1 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 100% LPC-03-2008 Dry 906.10 1 0% 1 0% 1 0% 1 0% 1 100% 1 0% 1 0% 1 100% 1 0% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-03-2008 Wet 906.1 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 100% 1 0% LPC-03-2009 Dry 906.10 1 0% 1 0% 1 0% 1 0% 1 100% 1 100% 1 0% 1 100% 1 0% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-04-2008 Dry 906.10 1 0% 1 0% 1 0% 1 0% 1 100% 1 100% 1 100% 1 100% 1 0% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-04-2009 Dry 906.10 1 0% 1 0% 1 0% 1 0% 1 0% 1 100% 1 0% 1 100% 1 0% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-06-2008 Dry 906.10 1 0% 1 0% 1 0% 1 0% 1 0% 1 100% 1 0% 1 100% 1 0% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-06-2009 Dry 906.10 1 0% 1 0% 1 0% 1 0% 1 100% 1 100% 1 0% 1 100% 1 0% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-06-2009 Wet 906.1 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% LPC-09-2008 Dry 906.10 1 0% 1 0% 1 0% 1 0% 1 100% 1 100% 1 0% 1 100% 1 0% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-09-2009 Dry 906.20 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 100% 1 100% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-09-2009 Wet 906.2 1 100% 1 0% 1 0% 1 0% 1 0% 1 100% 1 0% 1 100% LPC-10-2008 Dry 906.20 1 0% 1 0% 1 0% 1 0% 1 100% 1 100% 1 0% 1 100% 1 100% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-10-2008 Wet 906.2 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 100% LPC-11-2009 Dry 906.10 1 0% 1 0% 1 0% 1 0% 1 100% 1 100% 1 0% 1 100% 1 0% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-12-2008 Dry 906.10 1 0% 1 0% 1 0% 1 0% 1 100% 1 100% 1 0% 1 100% 1 100% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-12-2008 Wet 906.1 0 NA 1 0% 1 0% 1 0% 1 0% 1 0% 0 NA 1 100% LPC-12-2009 Wet 906.1 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% LPC-13-2008 Wet 906.2 0 NA 1 0% 1 0% 1 0% 1 0% 1 0% 0 NA 1 100% LPC-15-2009 Dry 906.10 1 0% 1 0% 1 0% 1 0% 1 100% 1 0% 1 0% 1 100% 1 0% 1 100% 0 NA 0 NA 0 NA 0 NA 0 NA LPC-18-2009 Wet 906.2 1 0% 1 0% 1 0% 1 0% 1 0% 1 0% 1 100% 1 100% Note: Orage=High Priority, Yellow=Medium Priority pollutat based o the moitorig statio data. Appedix B-14
Metals Oil ad Grease Sedimets Pesticides Nutriets Bacteria/ Pathoges Dissolved Mierals Orgaics Trash Bethic Alteratios Toxicity Gross Pollutats Chemistry 2011 LTEA Threat-to-Water-Quality Examples Table B-8: Pollutat Categories Atimoy Oil ad Grease TSS Chlorpyrifos Dissolved Phosphorus Eterococcus TDS Total Orgaic Carbo Trash Poor IBI Ceriodaphia survival BOD Chloride Arseic Turbidity Diazio Orthophosphate Fecal Coliforms O/E Ceriodaphia reproductio COD Sulfate Cadmium Malathio Total Phosphorus Total Coliforms IBI Hyalellasurvival MBAS Chromium Allethri Total Kjeldahl Nitroge CRAM Seleastrumsurvival Dissolved Oxyge Copper Bifethri Total Nitroge ph Lead Cyfluthri Eutrophicatio Coductivity Nickel Cypermethri Bethic Algae Nitrate as N Seleium Daitol Ammoia as N Zic Deltamethri Esfevalerate Fevalerate Fluvaliate L-Cyhalothri Permethri Prallethri Appedix B-15
Source Profile # Metals Oil & Grease Sedimet Pesticides Nutriets Bacteria/ Pathoges Dissolved Mierals Orgaics 2011 LTEA Threat-to-Water-Quality Examples Table B-9. Fial Source Loadig Potetials at LPC-02 Activities with Source Loadig Potetial 1 Residetial Areas ad Activities L L L L L L L L 2 Costructio Sites > 1 acre UL UL L UL UL UL L UL 3 Costructio Sites < 1 acre UL UL L UL UL UL UL UL 4 Costructio Sites: ESA or hillside or sedimet TMDL UL UL L UL UL UL UL UL 5 Developmet subject to SUSMPs (> 5,000 sq. ft. impervious area) UK UK UK UK UK UK UL UK 6 Roads, streets, highways, ad parkig facilities L L L UL L L L L 7 MS4s - Catch Basis, Drai Ilets, Coveyace, Pump Statios N N L N N UK UL N 8 Corporate yards (icl. maiteace/storage yards) L L L UK UK UL UL L 9 Parks ad Recreatioal Facilities - parks, golf courses, cemeteries, etertaimet veues, etc. UK UK UK UK L UK UL UK 10 Auto Mechaical Repair, Maiteace, Fuelig, or Cleaig L L UL UL UK UL L L 11 Equipmet mechaical repair, maiteace, fuelig, or cleaig L L UL UL UK UL UL L 12 Automobile ad Other Vehicle Body Repair ad Paitig L L UL UL UL UL L L 13 Mobile automobile or vehicle washig L L L UL UL UL UL L 14 Mobile Power washig* UK UK UK UK UK UK UK UK 15 Auto parkig lots ad storage facilities L L L UK UK UK UL L 16 Retail or wholesale fuelig UK L UK N N N N L 17 Pest Cotrol Services N UK N L N UK N UK 18 Eatig or drikig establishmets N L UL UK UK L UL L 19 Mobile carpet, drape, or furiture cleaig N UK UL N UK UL N UL 20 Geeral cotractors for home/commercial improvemets UL UL L UL UL UL UL UL 21 Botaical or zoological gardes ad urseries/greehouses L UL L L L L UL UL 22 Mobile Ladscapig N UL L L L L UL N 23 Pool ad Foutai Cleaig N N N N UK N N UK 24 Marias L L N UK UK UK N UK 25 Aimal Keels N UL L UK L L N L 26 Buildig Materials Retail ad Storage L L L UL UL UL UL L 27 Chemical ad allied products UK UK UK UK UK UL N L 28 Fabricated metal L L UK UK UK UL UL L 29 Primary metal L UK UK UK UK UL N UK 30 Recyclig, Juk Yards, Scrap Metal L L L UL UL UL L L 31 Airfields UK UK UK UK UK N UL UK 32 Motor Freight L L UK UK UK UK UL L 33 POTWs (water ad wastewater) UK UK UK N UK L UL UK 34 Cocrete Maufacturig L L L UL UL UL UL L 35 Stoe/Glass Maufacturig L L L UL UL UL UL L 36 Food Maufacturig UL UL UL UL UL UL UL UL N = Noe, UK = Ukow, UL = Ulikely, L = Likely Appedix B-16
I additio to usig the SLPs, Copermittees ca also use PGA Associatios to Pollutats ad other special studies to associate sources to pollutat. 5) Icorporate Source Quatities After determiig the high priority pollutat costituets ad the source loadig potetials, fid the umber of sources i the particular tributary/draiage area for the moitorig statio. For this exercise, it is recommeded that the Copermittees use the most up-to-date ivetory iformatio ad GIS software, if ecessary, to pipoit a accurate umber of sources i the particular draiage. Additioally, calculate the area of residetial lad use i the area, if available. The sigle source idetified withi the MS4 outfall draiage is show i Figure B-5. Oce these umbers have bee compiled, brig together the results of the umber of sources, residetial acreage, ad source loadig potetial ito a table for the pollutats of cocer. For the sake of the sigle-pollutat approach example, see Table B-10 for the high priority sources ad activities for bacteria/pathoges withi the draiage area. 6) Icorporate Other as Desired For this example, o additioal criteria are cosidered. 7) Develop Priority Rakig of Sources The fial step is to prioritize the table outliig the source quatities, water quality priority, ad SLPs for the priority pollutat (i this case, bacteria/pathoges). The prioritizatio is based off of the SLP ad the umber of sources ad residetial acreage i the draiage area (see Table B-11). Appedix B-17
Figure B-5. Map of MS4-LPC-02 Moitorig Statio ad Draiage Area; ote pollutat sources i red. Appedix B-18
Table B-10. Source Quatities, Water Quality Priority, ad SLPs for Bacteria/Pathoges at LPC-02 LPC-02 Bacteria Water Source # Quality Loadig Source Sources Source Priority Potetial ID 1 Residetial Areas ad Activities 49.91 acres 100 L 2 Sites > 1 acre - L 3 Sites < 1 acre - L 4 ESA or Hillside or Sedimet TMDL - L 5 Developmet Subject to SUSMPs (> 5,000 sq. ft. Impervious Area) - UL 6 Roads, Streets, Highways, ad Parkig Facilities - UL 7 MS4s - Catch Basis, Drai Ilets, Coveyace, Pump Statios - UL 8 Corporate Yards (icl. Maiteace/Storage Yards) 2 UL 9 Parks ad Recreatioal Facilities - Parks, Golf Courses, Cemeteries, Etertaimet Veues, etc. - UL 10 Auto Mechaical Repair, Maiteace, Fuelig, or Cleaig - UL 11 Equipmet Mechaical Repair, Maiteace, Fuelig, or Cleaig - UL 12 Automobile ad Other Vehicle Body Repair ad Paitig - UL 13 Mobile Automobile or Vehicle Washig - UL 14 Mobile Power Washig - UL 15 Auto Parkig Lots ad Storage Facilities - UL 16 Retail or Wholesale Fuelig - UL 17 Pest Cotrol Services - UL 18 Eatig or Drikig Establishmets 6 UL H 19 Mobile Carpet, Drape, or Furiture Cleaig - UL 20 Geeral Cotractors for Home/Commercial Improvemets - UL 21 Botaical or Zoological Gardes ad Nurseries/Greehouses - UL 22 Mobile Ladscapig - UL 23 Pool ad Foutai Cleaig - UL 24 Marias - UL 25 Aimal Keels, Horse Stables - UL 26 Offices with Osite ad Outdoor Storage Facilities 3 UL 27 Buildig Materials Retail ad Storage 1 UL 28 Chemical ad Allied Products - UL 29 Fabricated Metal - UL 30 Primary Metal - N 31 Recyclig, Juk Yards, Scrap Metal - N 32 Airfields - N 33 Motor Freight - N 34 POTWs (Water ad Wastewater) - N 35 Cocrete Maufacturig 2 N 36 Stoe/Glass Maufacturig 1 N 37 Food Maufacturig - N N = Noe, UK = Ukow, UL = Ulikely, L = Likely Appedix B-19
LPC-02 Table B-11. Prioritized Source Quatities ad SLPs for Bacteria/Pathoges at LPC-02 Bacteria Water Source # Quality Loadig Source Sources Source Priority Potetial ID 1 Residetial Areas ad Activities 49.91 acres 100 L 18 Eatig or Drikig Establishmets 6 UL 26 Offices with Osite ad Outdoor Storage Facilities 3 UL 8 Corporate Yards (icl. Maiteace/Storage Yards) 2 UL 27 Buildig Materials Retail ad Storage 1 UL 35 Cocrete Maufacturig 2 N 36 Stoe/Glass Maufacturig 1 N 2 Sites > 1 acre - L 3 Sites < 1 acre - L 4 ESA or Hillside or Sedimet TMDL - L 5 Developmet Subject to SUSMPs (> 5,000 sq. ft. Impervious Area) - UL 6 Roads, Streets, Highways, ad Parkig Facilities - UL 7 MS4s - Catch Basis, Drai Ilets, Coveyace, Pump Statios - UL 9 Parks ad Recreatioal Facilities - Parks, Golf Courses, Cemeteries, Etertaimet Veues, etc. - UL 10 Auto Mechaical Repair, Maiteace, Fuelig, or Cleaig - UL 11 Equipmet Mechaical Repair, Maiteace, Fuelig, or Cleaig - UL 12 Automobile ad Other Vehicle Body Repair ad Paitig - UL 13 Mobile Automobile or Vehicle Washig - UL H 14 Mobile Power Washig - UL 15 Auto Parkig Lots ad Storage Facilities - UL 16 Retail or Wholesale Fuelig - UL 17 Pest Cotrol Services - UL 19 Mobile Carpet, Drape, or Furiture Cleaig - UL 20 Geeral Cotractors for Home/Commercial Improvemets - UL 21 Botaical or Zoological Gardes ad Nurseries/Greehouses - UL 22 Mobile Ladscapig - UL 23 Pool ad Foutai Cleaig - UL 24 Marias - UL 25 Aimal Keels, Horse Stables - UL 28 Chemical ad Allied Products - UL 29 Fabricated Metal - UL 30 Primary Metal - N 31 Recyclig, Juk Yards, Scrap Metal - N 32 Airfields - N 33 Motor Freight - N 34 POTWs (Water ad Wastewater) - N 37 Food Maufacturig - N Rakigs based o umber of sources/residetial acreage ad Source Loadig Potetials N = Noe, UK = Ukow, UL = Ulikely, L = Likely Appedix B-20
Ivestigative TTWQ Approach The followig approach follows the geeral outlie of the previous two examples with oe differece the past moitorig iformatio is ot a primary factor i the TTWQ assessmet. Istead, the approach ca be used to aalyze curret moitorig data ad flows (immediate exceedace respose) i a attempt to locate sources usig other resources such as storm drai maps ad local draiage patters. This example uses the MS4 Radom Moitorig Statio idetified durig the sigle-pollutat TTWQ approach. 1) Determie Scale to Develop Threat to Water Quality As with the sigle ad multi-pollutat approach, the first step is to determie the scale ad locatio where a particular moitorig locatio ca characterize the flow from a tributary area. I additio, determie the flow ad storm drai etwork i order to pipoit the locatio of flows from the draiage. Figure B-6 shows the draiage area to the example MS4 outfall i the Peñasquitos watershed, icludig the storm drai map. 3) Determie the Water Quality Issue (Pollutat) to Evaluate Determie water quality issues by reviewig the curret moitorig data at the MS4 outfall. Ay exceedaces or readigs above the water quality objectives should be further ivestigated usig this approach. For ay exceedaces or readigs above the water quality objectives, refer to Table B-8 above i order to determie the priority pollutats. 4) Associate Sources to Pollutat Usig the high priority pollutats, the ext step is to review the fial source loadig potetials at LPC-02 to determie the likeliess of sources cotributig to the pollutat. Usig the iformatio preseted i Sectio 3 (Table 3-10), determie the activities with source loadig potetial with regards to the MS4 outfall (see example i Table B-9 above). I additio to usig the SLPs, Copermittees ca also use PGA associatios to pollutats ad other special studies to associate sources to pollutat. 5) Idetify Potetial Sources of Pollutats Based upo the resultig pollutat to source associatios, oe ca idetify the potetial sources withi the tributary area that are causig the exceedace at the MS4 outfall. Figure B-7 shows the resultig potetial sources for this example. Appedix B-21
Figure B-6. Map of MS4-LPC-02 Moitorig Statio ad Draiage Area, icludig storm drai etwork. Appedix B-22
Figure B-7. Map of MS4-LPC-02 Moitorig Statio ad Draiage Area, icludig storm drai etwork ad pollutat sources (red). Appedix B-23