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4) Side Sewer Improvements: Maintain existing backwater valve (every 3 months as per manufactures <br /> recommendations)and replace flapper with a new one. <br /> As-built Plumbing and Sewer Sketch <br /> See Attahced <br /> o, <br /> tit <br /> i <br /> } <br /> �"- "X <br /> k .x� i <br /> f apt <br /> Location of first backwater valve which has no access. <br />