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<br />IU~ <br /> <br />4. Determine Inflow. The inflow (rainfall related flow) will be <br />determined for each subsystem. The inflow data will be correlated to <br />rainfall using the inflow coefficient method (Q = kiA) to allow inflow <br />projections for any rainfall event. Rainfall data will be analyzed <br />using the Thiessan polygon method for rainfall distribution to obtain <br />average rainfall amounts occurring within each monitoring area. <br />Analysis of inflow volume will also be performed. The inflow will be <br />expressed in units to allow comparison between basins. <br /> <br />E. System Inspection. <br /> <br />1. Inspection Plan. An inspection plan will be developed and <br />presented to the OWNER for approval. The plan will detail procedures <br />and schedules of activities by area and task. <br /> <br />2. Surface Manhole Inspections. Surface manhole inspections will be <br />performed to identify manhole sources of infiltration and inflow and to <br />evaluate the overall maintenance condition of the manhole. Surface <br />manhole inspections are performed without physically entering the <br />manhole. The inspections will: <br /> <br />a. Identify and quantify manhole 1/1 flow rates; <br /> <br />b. Identify maintenance conditions of the manhole; <br /> <br />c. Provide data to confirm or revise existing map information; <br />and <br /> <br />d. Help establish sewer line maintenance needs. <br /> <br />Inspection will identify manhole 1/1 sources and defects which can be <br />seen from the surface. This information allows for evaluation of a <br />manhole's structural integrity and potential for leakage, as well as <br />gathering pertinent information for rehabilitation design. Selective <br />photographs will be used to document typical 1/1 sources and special <br />conditions. <br /> <br />It is estimated that surface inspection or inspection attempts at 20 <br />manholes will be made. A reasonable attempt will be made to inspect <br />manholes. Manholes which are buried or are not accessible because of <br />shrubbery, fences, not found, buried, or dogs will be noted as such and <br />reported to the OWNER. A second inspection attempt will be made if <br />access can be provided within a reasonable time after completion of the <br />initial inspection attempts. <br /> <br />3. Comprehensive Manhole Inspections and Line Lamping. Comprehensive <br />internal manhole inspection and line lamping will be performed to <br />identify manhole sources of infiltration and inflow and to evaluate the <br />overall maintenance condition of the manhole. The inspections will: <br /> <br />b. <br /> <br />Identify and quantify manhole 1/1 flow rates; <br /> <br />Identify maintenance conditions of the manhole and sewer lines <br />connected (including corrosion and hydrogen sulfide presence) <br />to each manhole; <br /> <br />a. <br /> <br />06/02/93 <br /> <br />A-IO <br />