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Stoneridge Residential Sewer Impact Study <br />City of Pleasanton (0012384.00) 2 Woodard & Curran, Inc. <br />Stoneridge Residential Sewer Impact Study December 9, 2022 <br /> <br />2. MODEL AND LOAD DEVELOPMENT <br />The proposed development area is shown in Figure 1 , along with the sewers that would be impacted by the <br />proposed development. Based on a typical flow factor of 220 gpd/unit, the proposed development would <br />add approximately 79,200 gpd. These loads were applied to the future loads scenario in the 2013 model to <br />identify potential impacts. <br />Model runs were performed both with and without the proposed future development. The hydraulic profiles <br />downstream of the proposed development to the Dublin San Ramon Services District (DSRSD) Wastewater <br />Treatment Plant (WWTP) under peak dry weather and design storm conditions are included in Figure 2 and <br />Figure 3, respectively. The associated data is included as a table in Appendix B. Note that the hydraulic <br />profiles are not noticeably different with or without the proposed development, so only the profile with the <br />proposed development is included. <br />The 2007 Master Plan identified a maximum depth of flow to pipe diameter ratio (d/D) of 0.75 under peak <br />dry weather flow (PDWF) conditions as the criterion for providing adequate capacity for dry weather flow. <br />Under design storm peak wet weather flow (PWWF) conditions, surcharge was allowed up to one foot below <br />the manhole rim. <br />Based on the hydraulic profiles included in Figure 2 and Figure 3, the gravity sewers do not exceed the City’s <br />PWWF criteria established in the 2007 Master Plan.