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APPENDIX C <br />Growth Capacity Allocation Documentation <br /> <br />Liquids Treatment <br /> <br />A summary of the MWMC liquids treatment capacity is presented in Table C-1. <br /> <br />TABLE C-1 <br />Capacity Summary of MWMC Liquids Facilities <br /> <br /> Average Flow Peak Flow BOD TSS <br /> Population (mgd) (mgd) (lbs/day) (lbs/day) <br /> <br />Existing capacity -- 49 175 66,000 71,600 <br /> <br />Current loading (current 217,737 43.8 264 54,800 64,700 <br />capacity required) <br /> <br />Available capacity (value) -- 5.2 None 11,200 6,900 <br />Available capacity (%) 10.5% 0% 17.0% 9.6% <br /> <br />Projected 2025 loading 297,585 59 277 74,000 87,600 <br />(future capacity required) <br />Growth loading 79,848 1515 30a 19,200 22,900 <br />Required Capacity 10 102 8,000 16,000 <br />Expansion <br /> <br /> Growth share of 2025 load 26.8 26.1% 10.8% 25.9% 26.1% <br /> <br /> Growth share of capacity '100% 100% 29.4% 100% 100% <br /> expansion <br /> <br /> Notes: <br /> A The 30-mgd peak flow attributed to growth consists of 15.5 mgd of average flow and 14.5 mgd of wet season I/I <br /> <br /> flow. See the following discussion for a detailed derivation of these values. <br /> <br /> The rationale for these values is presented in the following paragraphs. <br /> <br /> Average Flow <br /> The existing capacity is stated in the current NPDES permit as 49 mgd that represents the <br /> dry season design rating for the WPCF. The current loading or current required capacity is <br /> 43.8 mgd (presented in DSMM terms). The DSMM value is used to compare to the dry <br /> season design rating of the WPCF because the NPDES discharge permit stipulates that the <br /> WPCF meet monthly average permit requirements. Therefore, discharge permit <br /> requirements must be met on a dry season, maximum-month influent condition. This <br /> 43.8-mgd value is determined as follows: <br /> <br /> SEA31003271388(DG).DOC/041040034 <br /> <br /> <br />