Melinda McCoy, CDM Project Manager Jonathan Posner, CDM Steven Wolosoff, CDM Don Schroeder, CDM

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1 A Task 8-1 GIS List of Lands for BMPs for North Santa Monica Bay Regional Watershed Implementation Plan and Malibu Creek Watershed Bacteria TMDL Implementation Plan To: From: Carolina Hernandez, of Watershed Division Melinda McCoy, CDM Project Manager Jonathan Posner, CDM Steven Wolosoff, CDM Don Schroeder, CDM Date: Analysis of various geographical information system (GIS) layers was performed to identify a list of potential parcels for siting structural best management practices (BMPs) for the North Santa Monica Bay Regional Watershed Implementation Plan (RWIP) and the Malibu Creek Bacteria TMDL Implementation Plan (TMDLIP). GIS layers used to assess potential sites included parcels, drainage features, soils, zones of landslide or liquefaction potential, slope, recreational areas, and aerial photography. The final result of the analysis is a list of potential lands for siting structural BMPs, in a GIS compatible shape file format. This technical memorandum provides a brief description of the methods used to identify potential sites. Primary Screening for Suitable Parcels The general approach taken was to develop a list of potential sites for structural BMPs by starting with a complete parcel list and removing parcels with a low suitability for structural BMPs from consideration. Parcel data was provided by and. Parcels were determined to be suitable based on several criteria discussed below: All City owned parks and recreational areas. State or federal owned parks and recreational areas were removed from the list of potential sites. Parcels greater than 1 acre in size. Area for each parcel was calculated within a GIS software package, ESRI ArcMap. Parcels containing any significant portion with slopes less than 25%. A digital elevation map (DEM) with a 30 meter by 30 meter grid was obtained from the US Geological Survey National Elevation Dataset (NED). ESRI Spatial Analyst was used to compute slope for each cell in the grid to generate a raster file of slope across the NSMB region. Basic statistics of the 30 meter grid of slope were computed, including the mean, minimum, maximum, and range of slopes for each parcel.

2 Page 2 Parcels downstream of potential pollutant sources. This screening involved a subwatershed level view of parcels in relation to different land uses. For example, several parcels within the higher elevation areas of the Santa Monica Mountains National Recreation Area (SMMNRA) were determined to be unsuitable because they are far from impacted waterbodies and are not downstream of significant pollutant source areas. The NED was used to generate topographic contours, which were used as a tool to understand flow direction in support of this screening method. Parcels within or directly downstream of high priority subwatersheds (Malibu Lagoon, Lower Las Virgenes Creek, Stokes Creek, Lower Medea Creek, Upper Medea Creek, Lower Lindero Creek, Upper Lindero Creek, Westlake, Potrero Canyon Creek, and Hidden Valley Creek). All types of publicly owned parcels and those privately owned parcels that are within an area designated as vacant undifferentiated by the Southern California Area Governments (SCAG) GIS database. Aerial Photography Following this screening, aerial photography provided by LA (2001) and (2005), was used to assess actual ground conditions and determine the feasibility of different parcels for siting structural BMPs. Aerial photographs were observed to further screen out sites that would not be feasible due to competing uses and conversely, recapturing sites that were initially removed that appear to offer some opportunity for structural BMPs. This was done by panning across the entirety of each high priority subwatershed and using best engineering judgment to assess the feasibility of siting any type of structural BMP. Results The result of this parcel level exercise is a list of potential sites for structural BMP siting provided as a GIS shapefile. The shapefile was developed in the NAD 1983 State Plane California V FIPS 0405 Feet coordinate system. These parcels are also listed in and shown in the attached map.

3 Table Page 1 of 8 APN HV Private Hidden Valley Creek HV Private Hidden Valley Creek HV Private Hidden Valley Creek HV-4 opnspc Private Hidden Valley Creek HV Private Hidden Valley Creek HV-6 common Private Hidden Valley Creek HV Private Hidden Valley Creek HV Private Hidden Valley Creek HV Private Hidden Valley Creek HV-10 common Private Hidden Valley Creek HV Private Hidden Valley Creek HV-12 common Private Hidden Valley Creek HV Private Hidden Valley Creek LLV Public Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV Public Lower Las Virgenes Creek Vacant LLV street Private Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV Public Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV Public Lower Las Virgenes Creek Vacant LLV Public Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV Public Lower Las Virgenes Creek Vacant LLV Private Lower Las Virgenes Creek Vacant LLV-19 GRAPE ARBO City/ Lower Las Virgenes Creek Local Park LLV-20 DE ANZA PA City/ Lower Las Virgenes Creek Local Park LLV Public Lower Las Virgenes Creek Vacant LA

4 Table Page 2 of 8 APN LA LLV Public Lower Las Virgenes Creek Vacant LL Private Lower Lindero Creek Vacant LL Private Lower Lindero Creek Vacant LL Private Lower Lindero Creek Vacant LL Private Lower Lindero Creek Vacant LL Private Lower Lindero Creek Freeways/Major Roads LL Private Lower Lindero Creek Vacant LL Public Lower Lindero Creek Government Offices LL Private Lower Lindero Creek Vacant LL Private Lower Lindero Creek Vacant LL Public Lower Lindero Creek Freeways/Major Roads LL Public Lower Lindero Creek Vacant LL Private Lower Lindero Creek Vacant LL Public Lower Lindero Creek Vacant LL Private Lower Lindero Creek Vacant LL Private Lower Lindero Creek Vacant LL Private Lower Lindero Creek Vacant LL-17 MORRISON City/ Lower Lindero Creek Local Park LL-18 FOREST COV City/ Lower Lindero Creek Local Park LL-19 REYES ADOB City/ Lower Lindero Creek Local Park LL Private Lower Lindero Creek High Density SFR LL Private Lower Lindero Creek Vacant LL Private Lower Lindero Creek Vacant LL Public Lower Medea Creek Vacant LL Private Lower Medea Creek Vacant LL Private Lower Medea Creek Vacant LL Private Lower Medea Creek Vacant ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Golf Courses ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant

5 Table Page 3 of 8 APN LA ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Local Park ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant ML Public Malibu Lagoon Vacant ML Private Malibu Lagoon Vacant PC Public Potrero Canyon PC Public Potrero Canyon PC-3 common Private Potrero Canyon PC Public Potrero Canyon PC City/ Potrero Canyon PC Private Potrero Canyon PC City/ Potrero Canyon PC Public Potrero Canyon PC Public Potrero Canyon PC-10 common Private Potrero Canyon PC-11 common Private Potrero Canyon PC Private Potrero Canyon PC Private Potrero Canyon PC Private Potrero Canyon PC Public Potrero Canyon PC Public Potrero Canyon PC Public Potrero Canyon PC Private Potrero Canyon SC Public Stokes Creek Crops and Pastures SC Public Stokes Creek Vacant SC Public Stokes Creek Vacant SC Public Stokes Creek Vacant

6 Table Page 4 of 8 APN LA SC Private Stokes Creek Vacant SC Public Stokes Creek Vacant SC Public Stokes Creek Vacant SC Public Stokes Creek Vacant SC Private Stokes Creek Vacant SC Private Stokes Creek Vacant SC Public Stokes Creek Vacant SC Private Stokes Creek Vacant SC Private Stokes Creek Vacant SC Private Stokes Creek Vacant SC Public Stokes Creek Vacant SC Public Stokes Creek Regional Park SC Public Stokes Creek Vacant SC Public Stokes Creek Vacant UL Public Upper Lindero Creek Vacant UL Private Upper Lindero Creek Vacant UL-3 CANYON OAK City/ Upper Lindero Creek Local Park UL-4 RUSSELL RA City/ Upper Lindero Creek Local Park UL Private Upper Lindero Creek Vacant UL Private Upper Lindero Creek Vacant UL Private Upper Lindero Creek Vacant UL Private Upper Lindero Creek Vacant UL Private Upper Lindero Creek Vacant UL Public Upper Lindero Creek UL City/ Upper Lindero Creek UL City/ Upper Lindero Creek UL Public Upper Lindero Creek UL City/ Upper Lindero Creek UL City/ Upper Lindero Creek UL Public Upper Lindero Creek UL-17 common Private Upper Lindero Creek UL-18 common Private Upper Lindero Creek UL-19 common Private Upper Lindero Creek UL-20 common Private Upper Lindero Creek

7 Table Page 5 of 8 APN LA UL-21 common Private Upper Lindero Creek UL-22 common Private Upper Lindero Creek UL-23 common Private Upper Lindero Creek UL-24 common Private Upper Lindero Creek UL-25 common Private Upper Lindero Creek UL-26 common Private Upper Lindero Creek UL-27 common Private Upper Lindero Creek UL Public Upper Lindero Creek UL Public Upper Lindero Creek UL Private Upper Lindero Creek UL Private Upper Lindero Creek UM Private Upper Medea Creek Vacant UM Private Upper Medea Creek Vacant UM Private Upper Medea Creek Vacant UM Private Upper Medea Creek Vacant UM Private Upper Medea Creek Vacant UM Private Upper Medea Creek Vacant UM Private Upper Medea Creek Vacant UM Private Upper Medea Creek Vacant UM Private Upper Medea Creek Vacant UM Public Upper Medea Creek Flood Control UM Public Upper Medea Creek Flood Control UM-12 SUMAC City/ Upper Medea Creek Local Park UM-13 CHUMASH City/ Upper Medea Creek Local Park UM City/ Upper Medea Creek UM City/ Upper Medea Creek UM City/ Upper Medea Creek UM Public Upper Medea Creek UM Public Upper Medea Creek UM City/ Upper Medea Creek UM City/ Upper Medea Creek UM City/ Upper Medea Creek UM City/ Upper Medea Creek UM-23 common Private Upper Medea Creek

8 Table Page 6 of 8 APN LA UM-24 common Private Upper Medea Creek UM-25 common Private Upper Medea Creek UM Public Upper Medea Creek UM City/ Upper Medea Creek UM City/ Upper Medea Creek UM Public Upper Medea Creek UM Public Upper Medea Creek UM Public Upper Medea Creek UM Public Upper Medea Creek UM Public Upper Medea Creek UM Public Upper Medea Creek UM City/ Upper Medea Creek UM City/ Upper Medea Creek UM Public Upper Medea Creek WL Private Westlake Vacant WL Private Westlake Vacant WL Private Westlake Vacant WL Private Westlake Golf Courses WL Private Westlake Cemeteries WL Public Westlake Cemeteries WL Public Westlake Freeways/Major Roads WL Private Westlake Vacant WL Private Westlake Vacant WL Private Westlake Vacant WL-11 BENNETT City/ Westlake Local Park WL-12 THREE SPRI City/ Westlake Local Park WL Private Westlake MFR WL Private Westlake High Density SFR WL Private Westlake High Density SFR WL Private Westlake High Density SFR WL Private Westlake MFR WL Private Westlake MFR WL Public Westlake WL Public Westlake

9 Table Page 7 of 8 APN WL Public Westlake WL Public Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL-30 common Private Westlake WL Private Westlake WL-32 common Private Westlake WL Private Westlake WL Public Westlake WL Public Westlake WL Private Westlake WL-37 common Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Private Westlake WL Public Westlake WL Private Westlake LA

10 Table Page 8 of 8 APN WL Public Westlake WL Private Westlake WL Private Westlake LA

11 Russell UL10 Upper Lindero Creek UL23 UL-30 UM-36 any on COMADO CANYON PALO Lind ero C Medea Canyon UL17 UL-24 UL-18 UM-35 UL-31 Westlake UM-14 ULUL20 19 UL27 WL43 WL-44 Deerhill Kanan UL-21 UL11 UL12 UM15 UM-37 UL13 UL-14 UL25 UL-22 UM-17 UM16 ULUL IRGENES CR UL-29 WL-49 WL-50 WL51 Us Hwy 101 UMUM28 34 UM31 WL-48 Westlake Kanan LAS V WL-46 WL-47 UM21 UM-27 UM-26 UM30 UM-29 WL45 WL-52 UM-25 UM19 UM-22 ULUL UM-33 UM18 UM-20 WL-54 WL-56 UM24 UM23 WL57 Upper Medea Creek MEDEA CR WL-42 UM32 UL-1 VENTURA LOS ANGELES WL-31 UL-3 WL-19 WL21 WL-34 WL55 Westlake Thousand Oaks School House Canyon Lakeview Canyon Potrero WL33 Triunfo Canyon Portrero Canyon Creek PC-4 PCPC-10 7 PC-6 PC14 HV6 PC-18 PC-15 PC-16 Portola PC-9 PC1 HV-3 Trentwood PC13 TL AK E WL-9 WL16 WL-14 WL-15 Lakeview Canyon WL11 WL7 Hwy N1 LL18 LL-19 WL-10 WL-3 WL- WL5 6 WL-1 WL-2 WL-13 UL8 LL-20 UM-13 Lake Lindero LINDERO WL8 LLLL LL-11 UL-6 LL-5 LL-10 Unnamed Street LL21 Reyes Adobe LL1 Agoura LL-12 LL15 UMUM-2 UM-8 5 UM-6 UM-3 UM-7 UM-4 LL16 LL6 LL- LL7 8 Driver LL-2 LL-9 Lower Lindero Creek LL-4 LL22 LLV-1 UM-11 UM-1 CR EA LLV-18 UM-10 LLV-5 LLV-16 LLV-7 Hwy N1 Rondell Liberty Canyon LL26 LLV8 LLV-6 LLV15 Agoura LLV-11 LLV-12 Agoura PC-2 WL-12 Lindero Canyon Triunfo Canyon HV-7 HV12 HV9 LLV17 LLV19 Agoura LLV-4 Palo Comado Canyon UM-9 LL3 HV-2 LLV-2 LLV-3 HV11 HV-5 Mountian Gate Mureau Argos Foxfield HV-10 Hidden Valley Creek Westlake WL17 PC-3 She r La k wood, e WL-4 WL30 WL-18 HV-4 HV-1 WL-40 WL-41 W ES PC-8 State Hwy 23 PC-11 China Flats WL-38 Thousand Oaks Reyes Adobe UL-9 Dole Agoura LL17 Via Colinas Russell Ranch Las Virgenes Grey Rock UL5 UL-4 Thousand Oaks Hwy N1 Middle Crest UL-7 WL-37 WLWL PC-17 PC-12 School House Canyon WL-25 UM12 Stonecrest WL23 WL-24 WL29 Laro WL32 WL-22 Townsgate PC-5 WL-20 WL35 Cumberland Mount Calabasas UL-2 Lindero Canyon WL-27 Hwy N9 WL53 MED Hampshire Lower Las Virgenes Creek Liberty Canyon LL-24 Triu nfo Can yo n Lost Hills HV-8 HV13 LLV-9 LL-25 LLV-10 LLV-20 LLV-13 LL23 M ED EA C R Lower Medea Creek Troutdale Sierra Creek LLV14 Stokes Canyon R Stokes Creek M a La lib ke u LIBU CR MA C M R UC IB AL M A L IB U Mulholland SC-5 LLV21 SC-12 SC-14 LLV-22 SC-10 SC9 SC-13 SC-17 SC-2 State Hwy 23 MA L I B U LA CR SC1 SC-7 SV IR G SC-3 EN ES CR SC- SC8 6 SC-16 SC-4 SC11 Mulholland SC15 Hwy N9 Encinal Canyon Lechusa SC18 State Hwy 23 Hwy N1 Map of Potential Parcels for Siting Structural BMPs Ownership LIBU CR MA City Parks Private Public Subwatershed Abbreviations LLV: Lower Las Virgenes Creek LL: Lower Lindero Creek LM: Lower Medea Creek ML: Malibu Lagoon SC: Stokes Creek UL: Upper Lindero Creek UM: Upper Medea Creek WL: Westlake Malibu Lagoon ML17 Hwy N1 State Hwy 1 State Hwy 1 ML- ML-7 ML8 ML-10 ML19 16 ML-4 ML-11 ML-12 ML-13 ML-15 ML-2 ML-5 State Hwy 1 ML-18 AL M ML-6 ML-9 IB UC R