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( �y 21,�� � 1Va�thern, rnc. <br /> Proj�c!No.296�l04 <br /> 1 0.7 SiN and 8uildlny Dninsy� <br /> ( 'fhe prcsence of silty soils at the site indicates dninage should be provided fo�the <br /> foundu;oe perimeter. The foundation drainage system should consist of a minimum four(4) <br /> t inch diart►eta,Paforated.dS►d P�P�Placed(perforations downwards)aloag the actenor base <br /> I of the foundation perimeter and ag6tGned to a storm dnin rystem or ahu witsble ouda. <br /> The pipe should be bcdded on at least two(2)ine6es of pa gcavel and bacicfiUed with a <br /> r minimum of(12)inches of pea gravel. <br /> � Io orda to minimize the risk of storm water backflow irao footing drains.we <br /> r recommend that roof dowrtupouts be tiShtiined to a storm draia system or othex suitable outlet <br /> + separately 6om tlie footing draina. T6a site should be graded w t6at w�fice water nmoff ia <br /> directed to atch besins.which are attschcd w a storm uwa drain or other suitable owlet <br /> ( ff dewat«ing during cocut�uction is necessary,consttuaion-dewat«ing proceduces <br /> must i�lude routing of water to a suitable oudet. Within excavations,we recommead tkiat <br /> C devvatering include routing of water to sump areas,from where it may be pumped to a suitable <br /> oucla. <br /> 6.8 Site Dewatedng <br /> CBaxd on the pmvided site plan and our comersatioaa with you,we understan�'rhat <br /> � thrce(3�eight(8)foot dismecer UST's will be plactd ou-site for t6e storage of gasoline. <br /> B��o��m,��ou�wit6 yW,w�understand that the invert elevation of the UST's <br /> will be approximately minus twelve(-12)feet bgs. <br /> lThe resutu of our subwrface scudy indicate that heavy ground water saPaBe will be <br /> encouotered at approximately 7.5 feet bgs in the propoaed UST aaavation,wariancin8 <br /> � implementation of site dewatering prior to the iaidatioa of the proposed accavat►ons• <br /> We recoaunend that the proposed dewatain8 ayatan�nsist of four(4)dewatering <br /> weUs piaced aar the comers of the proposed UST e�ceavatioa. The dewatecing wells should <br /> � consist of thirty(30)inch diameter,appcoximately tweutY-Rve(25)foot dap holes drilled <br /> near the comers of the proposed UST excavatioa Ten(1�it�h diuneter dotted PVC pipe <br /> � (30,000 screen, slou extending&om the groundwater elevation to the bottom of the drilled <br /> lrole)shouid be placcd ia each of the wells. Pea gravel should be Qlaced uound the PVC pipe <br /> in the drilled ho1e,and etectric submersible pumps(minimum 250�:�eas/minute capacity) <br /> � s6ould be placcd'uuide the PVC pipe at the bottom of the hole. The proposed wdis should <br /> thrn be adequately developed. <br /> 1 We recommend that the dewatering of the site commeace at kast 48 doun prior <br /> to the inidatioa of the proposed escavations. <br /> ' <br /> � <br /> � li <br /> � <br />