Laserfiche WebLink
9 <br /> <br />maintenance on their property. <br />• In addition, we are having the developer verify the downstream conditions to confirm <br />their assumptions.” <br /> <br />Per the RCWD CAPROC dated April 8, 2020: <br /> <br />Soil conditions vary over the sloping site, with HSG D sandy lean clays (CL) at the higher <br />elevations, and HSG A/B poorly graded sands and sands with silt (SP/SP-SM) with sandy lean <br />clays below. The HSG D soils in addition to the high water table below the HSG A/B soils <br />make infiltration infeasible for the site. Thus, stormwater ponds are acceptable to meet the <br />water quality requirement. The pond sizing, and outlets and overflows are consistent with <br />design criteria. 100% of the project area either flows to the ponds or meets design criteria. <br />Additional TSS removal is not required. The applicant has met all the Water Quality <br />requirements and the design criteria of RCWD Rule C: Stormwater Management Plans. <br /> <br /> 2-year (cfs) 10-year (cfs) 100-year (cfs) <br />Existing Proposed Existing Proposed Existing Proposed <br />North to Private Ditch 3.5 2.3 5.1 3.9 6.9 5.7 <br />West to Private Ditch 11.6 9.2 34.1 28.7 82.8 74.7 <br />South through <br />Culvert under Birch <br />Street <br />4.4 3.5 8.0 6.5 14.6 11.9 <br />Totals* 19.2 12.5 46.7 35.6 103.3 87.8 <br />*Difference due to time of concentration <br /> <br />Post-development stormwater discharge rates are less than the pre-development rates. <br /> <br />Phasing <br /> <br />The site will be mass graded in one (1) phase and developed in two (2) phases. Phase 1 has 35 <br />lots and Phase 2 has 33 lots. <br /> <br />Utilities <br /> <br />Public water, sanitary and storm sewer utilities will be installed within the development. <br /> <br />Sanitary Sewer <br /> <br />An 8”-10” sanitary sewer pipe, 4” forcemain and lift station will serve the site. <br /> <br />Both existing houses located at 6651 and 6677 20th Avenue are served by private septic <br />systems. The house located at 6677 20th Avenue is being relocated onto a new lot in the <br />subdivision. Both houses are required to connect to the municipal sanitary sewer system. <br /> <br />Watermain <br />