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Non-Professional Services Agreement between City of San Leandro and Silman Industries—Exhibit A Page 29 of 30 12) Storage and disposal of all hazardous materials such as paints, thinners, solvents, and fuel; and all hazardous wastes such as waste oil must meet all federal, state, and local standards and requirements. 13) For guidance on selecting and implementing effective control measures the Contractor is directed to California Stormwater Quality Association (CASQA) at:http://www.casqa.org Concrete Operations 1) Store all materials in waterproof containers or under cover away from drain inlets or drainage areas. 2) Avoid mixing excess amounts of Portland cement materials. 3) Do not wash out concrete trucks into storm drains, open ditches, streets, streams, etc. Whenever possible, perform washout of concrete trucks offsite where discharge is controlled and not permitted to discharge to the storm drain system. 4) Locate washout area at least 50 feet from storm drains, open ditches, or other water bodies, preferably in a dirt area. 5) Prevent runoff from this area by constructing a temporary pit or bermed area large enough for the liquid and solid waste. 6) Wash out concrete wastes into the temporary pit where the concrete can set, be broken up, and then be disposed of properly. If the volume of water is greater than what will allow concrete to set, allow the wash water to infiltrate and/or evaporate. Otherwise, discharge wastewater with approval from the Engineer discharge filtered water into the Sanitary sewer. Remove or vacuum the remaining silt and debris from the ponding or bermed area and dispose of it properly. 7) Collect and return sweepings from exposed aggregate concrete to a stockpile or dispose of the waste in a trash container. SPILL 1) Prevention and Control. 2) The Contractor shall take any and all precautions to prevent accidental spills during the work under this contract. 3) Keep a stockpile of spill control materials, such as rags or absorbents, readily accessible onsite 4) In the event of a spill, the Contractor shall: 5) Report any hazardous materials spills immediately to the Alameda County Fire Department, the Alameda County Hazardous Materials Division, and other state and local agencies as required by state and local regulations. 6) Immediately contain and prevent leaks and spills from entering the storm drain system, and properly clean up and dispose of the waste and clean up materials. 7) Not wash any spilled material into the streets, gutters, storm drains, or creeks DocuSign Envelope ID: 23227C11-F678-4CF3-95AF-AD4B0DEB1E28