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I —__S"iORh1WATERSITE• PLAN DECLM6ER 19.?005 <br /> NGW CLNTURY V(I.LAGE PAGE 12 <br /> I <br /> � Width = 16 fect <br /> IDepth = 3.0 feet <br /> The computer screen sliots from WVUHM2 are included in Appendix C. <br /> IDEVELOPGD BASIN 3 <br /> This basin is the repair and updating of an esisting d:}nvel! that appears to no longer <br /> I functiun adcyuatcly. The existing cacchuasin is the lowest storm system on site and it is <br /> not possibic to direct this flo�v into a viablc downstream system on thc site without a <br /> pump. \�c proposc to connect the systcm to a new infiltration system. The basin is less <br /> ' than 5,000 sf in sizc and is thus a small intiltration svstcm. <br /> � <br /> � <br /> i, TREATMENT <br /> Treatment will bc pruvided by a sedimcntation ��ault. The sedimentation vault has becn <br /> � sized for the G month storm event per thc requirements of dic CEM Manual using thc <br /> ' following equations: <br /> Qo=6 month volume;8G,400 <br /> = 287/86,400= 0.0033 <br /> � <br /> i <br /> Vi����= 1 G76.5 Qo H use H = 3.-1?' <br /> , = 1676.5(0.0033)(3.42) <br /> i = l9cf <br /> A Cuz concrete CCP 577 GI, or equal, proviiles approximately 118 cf of dead storage and <br /> I is proposed for use on this project. This system will contain a��'ated cover and replace thc <br /> CRISIIII�'C1C�VL'��. <br /> � <br /> ' INFILTRATION <br /> The trench will be located to the west of the structure to avoid an existiny; retaining wall <br /> � along the cast prorerty line north of the catchUasin. The bot[om of trench will be lower <br /> � than the surrounding buildings to prevent mib�ration of water to thc buildin� foundation. <br /> � <br /> � The proposed intiltration trcnch has tho follo«�ing dimens�ons: <br /> Length =40 fcct <br /> Width = 7 fcet <br /> ' Depth = 3.0 fcct <br /> i <br /> Il:c computcr scrccn shots frum \V�VHM3 arc includcd in Appendix C. <br /> l <br /> i <br /> � <br /> � <br /> I DWHlsrm <br /> ` - ^.:-JSi D� r.a]e. c Ccr:�ry WC <br /> J h�.�. � .PrU�r..CeaYLe'el�licicbp.. r� 3 Pl:en � _ <br /> 4 h ,'�M <br />