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� � - <br /> March Id. ZO10 <br /> I�ddilion to Siccvr.s Rcsidcncc <br /> LK/� .lob No. 10-OOR <br /> Yagc 17 <br /> inches above cround�+�:+tcr Ievel. hut not less than 4 inches thick. 'l�he crush rock base <br /> should bc comp;�ctcd in 12-inch litis to a non->'icl�ing statc ���ith a vibratory mechanical <br /> �ompactor. <br /> RunofY over Impervious Surfaces <br /> S(orni runol't'ovcr impervious surlaces, such as roots and pavcd arcas, shotdd bc callcctcd <br /> by undcrground drain linc systcros conncctcd to downspouts and by catch basins installcd <br /> in pa��cd arcas. Stonnwatcr thus collcctcd should bc tightlincd to dischargc into a ncarby <br /> storm sc�vcr. <br /> Building FooNeg Drains <br /> A subdrain should bc installcd around thc perimctcr fiiotings of the ncw addition to <br /> minimizc accwnidation of�groundwatcr undcr it. "1'hc subdrain should consist of 4-inch- <br /> minimum-diamctcr, p�rfiiratcd. rigid, drain pipcs, laid a Icw inchcs bclo••, thc bottotn of <br /> perimetcr luotings. 'I'hc trcnches and the drain lines should have a s�d�ficicnt gradicnt (0.5 <br /> perccnt minimum) to gcncratc Iloa� by gravity. 'I�hc drain lincs should bc cncloscd in <br /> washcd gravcl and complctcl�� �vrappcJ in non-�vovcn tilter fabric to �vithin about 12 <br /> inchcs of�linish gradc. 'I�hc remaining trenches may be backtilled with on-sit� impervious <br /> soils. Watcr collcctcd by thc footing drain systetns should bc tighUincd. scparatcly Gom <br /> lhc roof and surfacc storm���atcr drain systems, to discharec into a ncarby stonn sc���cr. <br /> —,--\ <br /> LIU & ASSOCIATES, INC. <br /> /7��3 <br /> , <br />