ORANGE COUNTY FLOOD CONTROL DISTRICT (3) -2008

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Santa Ana River Channel E01-R1551, R1553 19. BEST MANAGEMENT PRACTICES (PMF11.2S) TENANT and all of TENANT'S, subtenants, agents, employees and contractors shall conduct operations under this Lease so as to assure that pollutants do not enter municipal storm drain systems which systems are comprised of, but are not limited to curbs and gutters that are part of the street systems ( "Stormwater Drainage System "), and to ensure that pollutants do not directly impact "Receiving Waters" (as used herein, Receiving Waters include, but are not limited to, rivers, creeks, streams, estuaries, lakes, harbors, bays and oceans). The Santa Ana and San Diego Regional Water Quality Control Boards have issued National Pollutant Discharge Elimination System permits ( "Stormwater Permits ") to the County of Orange, and to the Orange County Flood Control District and cities within Orange County, as co- permittees (hereinafter collectively referred to as "County Parties ") which regulate the discharge of urban runoff from areas within the County of Orange, including the Premises leased under this Lease. The County Parties have enacted water quality ordinances that prohibit conditions and activities that may result in polluted runoff being discharged into the Stormwater Drainage System. To assure compliance with the Stormwater Permits and water quality ordinances, the County Parties have developed a Drainage Area Management Plan (DAMP) which includes a Local Implementation Plan (LIP) for each jurisdiction that contains Best Management Practices (BMPs) that parties using properties within Orange County must adhere to. As used herein, a BMP is defined as a technique, measure, or structural control that is used for a given set of conditions to manage the quantity and improve the quality of stormwater runoff in a cost effective manner. These BMPs are found within the County's LIP in the form of Model Maintenance Procedures and BMP Fact Sheets (the Model Maintenance Procedures and BMP Fact Sheets contained in the DAMP/LIP shall be referred to hereinafter collectively as "BMP Fact Sheets ") and contain pollution prevention and source control techniques to eliminate non - stormwater discharges and minimize the impact of pollutants on Stormwater runoff. BMP Fact Sheets that apply to uses authorized under this Lease include the BMP Fact Sheets that are attached hereto as Exhibit D. These BMP Fact Sheets may be modified during the term of the Lease; and Director shall provide TENANT with any such modified BMP Fact Sheets. TENANT, its subtenants, agents, contractors, representatives and employees and all persons authorized by TENANT to conduct activities on the Premises shall, throughout the term of this Lease, comply with the BMP Fact Sheets as they exist now or are modified, and shall comply with all other requirements of the Stormwater Permits, as they exist at the time this Lease commences or as the Stormwater Permits may be modified. TENANT agrees to maintain current copies of the BMP Fact Sheets in TENANT'S administrative offices throughout the term of this Lease. The BMPs applicable to uses authorized under this Lease must be performed as described within all applicable BMP Fact Sheets. TENANT may propose alternative BMPs that meet or exceed the pollution prevention performance of the BMP Fact Sheets. Any such alternative BMPs shall be submitted to the Director for review and approval prior to implementation. Edna Park Lease (06.16.09) 10