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<br />". <br /> <br />""" <br /> <br />""wI <br /> <br />storm events and for each monitored area. In addition, peak flow ratios shall be <br />computed. These findings shall be used to assess the absolute magnitude of <br />rainfall-dependent III and to rank the areas accordingly. In addition to the <br />rainfall-dependent III analysis, an analysis of groundwater infiltration shall also <br />be conducted. This analysis shall quantify the amount of groundwater <br />infiltration present in each monitored area, based on changes in base flow levels <br />after storms and on the magnitude of minimum flows occurring at night relative <br />to average daily flows. These findings shall be used to assess the absolute <br />magnitude of groundwater infiltration and to rank the areas accordingly. <br />(Replaces Task 4.3) <br /> <br />11.4 Present the findings in a technical memorandum, which shall include <br />recommendations on further physical investigations (e.g., smoke testing, flow <br />isolations, additional monitoring, additional television inspection, etc.). <br />Guidelines established by OCSD shall be considered in this evaluation. The <br />cost-effectiveness of III reduction measures determined in other studies shall be <br />considered as well. (Replaces Task 4.4) <br /> <br />Task 12. Calibrate Model for Wet Weather Conditions <br /> <br />12.1 Calibrate the model for wet weather flow conditions, using the flow data <br />obtained from City and OCSD flow monitors and the lift station run time <br />records. The wet weather calibration will be performed for the rainfall event <br />that most closely approximates a suitable design event (i.e., significant rainfall <br />on wet soil conditions). The calibration parameters shall be factors affecting the <br />volume and shape of the wet weather hydrographs and groundwater infiltration. <br />(Replaces those portions of Task 6.2 related to the wet weather flow calibration). <br /> <br />Task 13. Model Effects of III Reduction on Required Improvements <br /> <br />13.1 Perform additional model runs assuming a reduction in III in selected areas to <br />determine the potential benefits of III reduction in terms of reducing the number <br />and cost of required relief sewers. (Replaces Task 7.5) <br /> <br />Task 14. Prepare III Studv Report <br /> <br />14.1 Include an Infiltration and Inflow (III) Study Report as part of the draft and final <br />Master Plan Reports. The III Study shall provide an overview of the extent of <br />infiltration and inflow into the sewer system, and shall identify areas of potential <br />problems and provide an overall estimate of impacts to the system. <br />Recommendations for future more detailed studies shall be included. <br />Documentation of the structural condition of those sewers televised in this <br /> <br />2 <br /> <br />11/20/02 <br />