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MASSEY, �� <br />CONSTRUCTI�'N <br />MIKE MABtEY <br />&mnl CrntrKmr <br />SYW 16EIA SL S.W. Oflka (/251 712-13 7 7 <br />EdmonM, WA Yl02! F�: (AYS) 712-1377•St <br />tk./MA95EC103/0E . µapy__ <br />Short Subdivision = �3-97 <br />The Follo�ving calculations w�ere based upon the geotechnical and drainage evaluation <br />done bv Dennis M. Bruce, P.E. dated Jul}•, ?nd 1998. <br />Subject: Drive���ay and privite access road �vater runoff storage for intiltration. <br />�1,000 square feet of driveoa�• and private road. <br />Gra� el filled trenches ? feet wide and I-I: 2 feet deep. <br />Per table 3-3.3. <br />�1,000 divided by l00 =d0 x 2.0�1= 82 Lf of ��ravel trench. <br />Subject: Roof- top runoff in;iltration s�stems. <br />Lot I= 1,900 square feet of root=top runoff. <br />Trench ? feet �� ide and 2 feet deep <br />Per tablz 3-3.3 <br />I.900 divided bv 100 = 19 x 1.66 = 32 LF of trench. <br />Lot 2= I�00 sguare feet of roof-top runot7' <br />Trench ? feet ��ide and 2 f�t deep. <br />Pertable 3-?.? <br />1�00 di�ided by 100 = l0 x I.66 =33 LF of trench. <br />