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21106 76TH AVE W
Iiiiiiiiiiiiii 15177 21106 76TH AVE W -79M STREET FLE NC, IATES, INC. 23423 Highway 99 Edmonds, WA 98020 P.O. Box 32 Lynnwood, WA 98036 RF-CEiVED JUN Engineering Dept. Dept. of Public Worksr. ir. Of Pubfic Works City of Edmonds Edmonds, Wash 98020 RE: Hydrblogyc6 f -','thbc Str-idk land Parking Lot 4�20101IMM70th-ZW- Please find attached the calculations carried out to determine the adequacy of the existing sub -storm drain system installed a few yea I rs ago at the time the parking area was a gravel surface. The calculated sizing is based upon an as7':built survey of the improvements involved. Respectfully, Meyring and soc , Inc. Enc. Site Plan Calc..sheets Ref. charts 'ET FiLE 0' W.'' ole'411VI461� 1eFX_lA110- 7- 5 TR IC14CZAIV4r�) /A/ _500 �WC. /.9/ 7—Z7AIR4,67 Wo 'Fl 2060 S74- SSW 4012 Am 7� r 1 6 41.4 — rdyo - �t �W X \Nl 't ' - oqr 33 0=4 Acl) A " I r3'5 UA LL ok/ , aurlo�174 SC,0/02_ / "=' 4��o * Was 0% Wasb MEYRING & ASSOC., INC. 23423 Highivav 99 Edmonds, WA 98020 ? rst P., 0. Box -32 Lynnwood, WA 98036 778-3101 �,000lw lo;iW.5-4 X. e.:: qr4 A ZA x 33 I Aw A 4- 019 0.9 9 .= I A Ael .5c 0; 1-71 149-321---cr 1,6 "'lP'h--- 0 Z-e 1 33 ep re-0-22L-ol 0/s e% 0 7 < A 6- WJ. 36 A I ILE T F .$�Oe Co- 742 . 57'elc-- 4z 1071-4�- (C 9ro, 0 a 4- (0.5xo z- a G )4( 45 S'7 - � - C2, Z, RUNOFF }/AC'rOits I -OR STORM SEWERS . FLAT 0-6% UNDEVELOPED LAND Wood � Forest . . . . ... ~ . ^ ~ , . . O�0S Sparse Trees & Ground Cover , . , , . . 0.10 Light Grass to Bare Ground , . . . , . 0.15 DEVELOPED AREA Ito LLlN(| ) U.l) 0.2U ` Pavement & Roof� , , . . ^ . , . . , 0 9A ' ' GravelRuads � Parking Lots . . . . . — »,»» ' City Uus�om�s . . . . , .� . . . ^ . . , o,m� U 9O ' Apartment Dwelling Areas , . , , . . . 0.80 0.8S Areas ���� (Heavy) . . . . . . , 0,70 0.80 Industrial Areas (Light) . . . . . . . 0,60 0'70 Earth Shoulder , . . . . . . . , . . . 0 . 6O O ,�U Playground . . , , ^. ^ , . . ,� , , . , 0 . 2S' 0.30 Lawns, Meadows & Pastures , . ^ , . , , 0.20 0.26 Parks C Cemetery . . . . . , , ` ^ ^ ` 0 ^ 'Z0lS 0 SINGLE FAMILY RESIDENTIAL (Dwelling Uoit/Gro`ay Acre) � l . U - l . 5 DU/GA. , . . . ... , , , ^ , ' , , () ^ 0.3() 1'5-3.0 DU/GA. , , ' ' . . , , , . ' ' ' ' o ' 3'0-3,6 DU/GA. . . . . . . , ^ . ^ , ' ^ ' 0.40 3. S-4 'O DU/G& *. . , ' . . ' . . . . ' ' ' ' U ' l\ 4.0-6.0 DU/GA . . . . , , . ' . ' . , , ' . 0.50 0'0-9.0 DU/GA . . . . . , . ^ . ^ ^ ^ ^ ' . A'oU 9,0-lS.0 DU/GA . , , . . . ^ ' ^ ' ' , , .. ' U _ 7U - � . 18 -e Lot- ..... ..................... ..... . ... . .. . .. . ......... . ...................... .......... . ...... . .. .......... .......... .......... .............. ........ ..... . .......... .......... ... .......... Ali Illi2iwe'' As ilk ........... ....... ......... .... Me ...... ...... 4 . ................. Y%w Amp I ....... 71 ......... ....... . PL��04— ............... ........................... . .. . ............................ ........................ ... ... ........ 7-1 t.:Alroi.-O. W.,Mllo-Mt�d . ... ..... ..... ....... . ....... ........ ....... . ....... ........ ......... ...... ........... ......... .......... io . . . ............................... ....... .................... .... ......... ......... ....... ..... ... ......... ......... ...... ......... ... ....... ...... . ........ ......... ....... ..... . ....... .... .......... ....... .. .... .......... ........ ................. ................. ................ . .......... ...... .............. ... . ..... . ..... ........................... -'J . .... . ..... .......... . .. . ......... ....... 7 . ........ ... ......... ....... ..... . . ........ ... ..... YAP.: ..... f ....... . .. .. Ar Mor.: !..'I ...... .......... ....... ........... ........ ... .... ... ....... ...... .. ........ ......... ....... .......... ........ . ...... ...... ... ......... ......... ......... . ............. ......... - -- - ---------- 7- ...... ........ . . ... ....... . .... .. .. . ....... .... ....... ......... ....... ....... ...... .......... ....... .......... ....... .......... .... ... ... ...... ........ .... .... ......... ....... .............. ./ .. .............. I ....................... . ..................... ........ .. ........ ................ .. .............. ...... . . ... . . .......... ....... ...... ...... ......... ...... ......... ... .... .... ........ .......... ..... ......... ......... ...... ........ ....... ...... ...... ......... ....... ........ ...... ......... ......... ................. Li .......... .... ....... ....... ..... '00* ......... .......... ........ ....... ............... ......... ...... ......... ... ....... .. ... . .................. ....................................... ......... ........ ................................ ... r w A a ff AV j "PW &,,7r HERCULDWWWW��Mm, H'*ECRYSrALENrn INATTif 14ANCY 901 PATTINN 41.1 * b 0-,.- v Wq