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114-06 - Ord. Amending Ord. 141-97 County Code 14.48 Stormwater Management
SECT O SEC i FIN IV A, SON COU ''Y Sr;'ORMWA r R { MANAGHM1HN�' O� Ordinance No. lig .O6 mending Mason County Stormwater anagement rdin�nce No. and1 Mason County Code caapter 14.48 C OY I1KN' [ S CGS 0 FAC indmugs of fact... .2 Nee 9 TEED ND P `V RLL 0 S 1H,00oc �NCL 4 -97 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o a c 0 a o o c o 0 0 0 0 0 0 0 0 0 0 0 0 0 o a a 0 0 0 0 a o 0 0 0 0 o a o 0 0 0 0 0 0 0 0 0 0 0 0 0 o e o a o a o 0 o a 0 o a o 0 0 0 o a a o 0 0 o a o 0 0 0 0 0 0 0 0 0 0 o c o a o o a o 0 0 u c o 0 o c o o a o 0 0 0 0 0 0 o c 0 a 1.3 11 u r p o s c a a a a 0 o a a a a a ON \ 2: DE1ri H,CTI O 3: LIEN 3.1 ✓.2 Icy li ,CTJLO SECS' SEC SEC 0 0 0 0 o a o a o a a a o 0 0 o a 0 0 0 0 0 a o 0 0 0 0 0 0 0 0 0 0 o a o 0 0 0 o c 0 a o o a 0 0 0 o a 0 0 0 a a o o e o 0 0 0 o a a o o a o 0 o a 0 0 o a a 0 a o 0 0 o a o 0 0 0 a o e o o a o e o 0 0 0 0 0 0 0 S0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o a o 0 0 0 0 0 0 0 0 0 u 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 J PRO V SY�l V a o o e o e o 0 0 0 0 o n 0 0 o a o 0 0 0 o a a o 0 0 0 0 0 0 0 0 0 0 0 o a o o u o o o a o 0 0 o a 0 0 0 0 0 0 o 0 0 0 0 0 0 o a o 0 0 0 o a o a n o 0 0 0 0 0 0 0 0 o a o 0 0 0 0 ',rogation and greater restrictions......... nteIl pr `V- tation a o 0 Z4:APP CAB ON 5: REGU-,A 5.1 ✓e2 1J O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 c 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 n 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 u0 0 0 0 o a o 0 0 0 o a n 0 0 o a o 0 0 0 o a o o a o a o e a o a a o a a o 0 0 0 0 0 0 o a a o 0 o a o a o 0 0 0 0 a o a u o 0 0 0 0 0 0 0 o a o o a o a o e 0 a o 0 0 o e o 0 o a o 0 0 0 0 0 o n 0 0 0 0 o a ED A, C 1V 11IHS AND AL ,OWED ACr Imo/ 0 0 o a o a o a o 0 o e a o 0 0 o a a a e 0 0 o a o o a a a o 0 0 0 Regulated l 2lV tiv i i aa.vay.oay..aavaava.eeeeeeaeaeaeeeeeaeeaae.aveevavavaavavaaavavaavoavavaaaaaaavay.aavaavaaaaaava Hxe- rpt ions n u0 a n 0 . ION 6: GECF 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o a 0 e 0 e c 0 0 0 0 0 0 0 o 0 a 0 o 0 a o e o a 0 a 0 a o 0 a o a 0 0 0 0 0 0 o a 0 a o 0 0 a o 0 0 0 0 0 0 0....1' a e 0 a o 0 o a o 0 o a a a a o 0 o a o 0 0 0 0 0 0 0 0 0 o a a o o a 6.1 Stormwater ManagementManual Adop-ed............. 6.2 Stormwater -hest Management Practices 6.3 Illicit Discharges. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O 0 e 0 0 0 0 0 e 0 0 n 0 0 a 0 oca0 o a o a o 0 0 0 0 0 0 0 0 0 0 0 o a a o 0 o a a o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 c 0 0 0 0 ON 7: APPROVAT J SAN)ARDS a e 701_ 7 91 0 7.1.3 7.1.4 7. 7.2 G2 2 2=3 3-10 10 1 • 2 2 12 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o a o 0 a 0 0 0 0 0 0 0 o a c 0 0 0 0 c o a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Small Parcel Minimum Requirements 0000 00 0000000000000000000000000 000000000000000000000000000000 oo O 1 Small Parcel Requirement #1 Construction Access Route 0000000000000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 000000000000000000000va000000013 . 2 Small Parcel Requirement #2 Stabilization of Potentially ll Jrodible Deluded Areas n a a n a a a n n n n n a n n a a a a a n n o a n n a n a n n 0 n n Small Parcel Requirement #3 Protection of cljacent Properties 0n00000 a 000000000000000000000000000000 n a no n 00000000 a 000000 a 00 eo� Small Parcel Requirement #4 12 3 3 Maintenance .. .. a n a n n a o a . 5 Small Parcel Requirement #5 7.2.i 7.2.2 7 . 2 . 3 of ler BMPs 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 c 0 0 0 0 0 0 0 c 0 0 0 0 0 0 0 0. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 n 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 e 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 New Development and Redevelopment Minimum R.equirements0000000000 000000 0000 0000000 ew !Development 00000000000000000000000000000000 Redevelopment u 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 oeeeo 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 Co 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 l�Vinim�: m Requirement #1 Erosion and Sediimen`, Contro 7.2.4 Minimum Requirement:. #2 Preservation of N atLral 7.2.5 Minimum Rec t..irerent #3 Source Contro o " Poi ution 7.2.6 Minimuxn {equ:irement #4 Runoc lfreatment BMPs 7.2.7 Minimum Requirement #5 Strew bar 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Drainage Systems 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 13 1 3 4 4 L 14 14= 5 6= 0 0 011 9 0 0 0 0 0 0 0 e 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 u 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 0 0 o 0 0 0 0 0 0 u 0 0 0 0 0 0 0 0 0 li ,rosion Contro 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9 5 9 9-20 20 7.2.8 hit 7 . 2 a / I MASON C O •\..J 1\' I'Y 1._1' 1 O WATER inirnum Requirement #6 Wetlands inirnum Requirement #7 Water Quality Sensitive Areas oe0000aoaeaaoaoa00000noo... Aff CONIrEN'S (cont.) " ORD �N CIE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 n 0 0 0 0 0 0 0 0 0 0 0 0 o a o 0 0 0 0 0 0 0 0 0 0 0 o n o a o 0 o a o a o 0 0 o a a o 0 2_ 2 702.10 _Vinimum Requirement #8 Offsite Analysis y sis Mitigation 00 00000000 00 000000000000000000000000000000 00 0000000000000000000 21ez>22 7.2.:1 Minimum Requirement #9 Basinan n I1 n 21 00000000000000000000000000000000000000000000000000000000000000000cov0000000000000000000000 702.12 Minimum Requirement # 10 Operation and Maintenar[ 7.2.13 Minirum Acquirement #11 Financial Liability ce 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7.2.14Variances from Tlese Standards........ 7.2.15 Experimental 1iVPs 7.2.1501 pprova.l of Hxperirne SF,C t TON 8: 8. 8e2 8.3 S E `L./' I S11-,,C S' RAC' -ON Director Review and Approva 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 00 0 0 0 0 0 O 0 000000 0 0 0 o a a o 0 0 0 0 0 0 0 0 0 o a o 0 o a o O a o 0 0 0 0 o a o 0 0 0 0 0 0 o a o o a a o o e o 0 o a o o a o 0 o a o a o 0 0 o a a a o 0000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 al BTVPs 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O 0 0 0 0 0000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o a o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o a o 0 0 0 0 0 0 0 o a o 0 0 0 0 o a o 0 0 0 0 0 0 o c o 0 0 0 0 o a o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 n1 orceren t uthority. 0 8.4 Inspection a o o a a a O o o a o a o 0 o a O o o a o o a O O o 0 o a O a O a O o a a O a O a a O a a O a O O a o a o a O O o O a O o a 0 0 0 O a o 0 0 o a O O a O o a O a O a O a O a O o n a O 0 0 o e o 0 0 o a o e o e o 0 o e o 0 0 0 0 0 0 e 0 o a e a o o a o 0 0 0 0 0 o e o 0 0 0 0 0 0 0 o e o 0 n o o 0 o a o a o o a o o e o a o e e o o a o 0 0 0 0 o a o 0 0 o n o 0 0 0 0 0 o a o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ON 9: ENFORCEMENT 11 9a, 9.2 9.3 90301 9.3.2 General 0 0 0 0 0 o a o e o e 0 0 0 o n o o c a o e o 0 o a o 0 0 0 0 0 o n o 0 o O o 0 0 0 0 o a a o o a o o a o 0 e o 0 0 0 0 o e o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o a o 0 0 0 o a o 0 o n 0 0 0 0 0 0 0 0 0 o a 0 0 o a o 0 0 o e 0 o a o a o a o 0 o c o a 0 a o o a a o a o 0 0 o a o o a o 0 0 o a o o a 0 0 0 0 o a o 0 0 0 0 0 0 0 o a o 0 0 0 o a o a o 0 0 0 0 0 0 0 0 o a a a o 0 o a o 0 0 o a c a o o a o o a o 0 o a o 0 o a o 0 0 o a a a Stop Work Order 00a000ao Civi_ Penalty Penalties Due 000000 0 0 0 0 0 0 0 0 O 000000 Penalty Recovered ON y 0: EXCEPT 10.1 10.2 10.3 10.4 ONS 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 e 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 n 0 0 0 0 0 0 0 o a o 0 0 0 0 0 0 0 O 0 0 0 0 0 0 0 0 0 0 0 0 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o 0 o a 0 0 0 0 0 o 0 0 0 0 0 0 0 0 0 0 a 0 0 o 0 0 0 0 0 0 0 o 0 o 0 o 0 o o 0 0 0 0 O 0 0 0 0 o 0 0 0 0 0 0 0 0 0 0 o a o 0 0 0 0 0 0 o a a o 0 o a o O a o e 0 o a o o a a e o a o a a o a o e o 0 0 0 0 0 0 o e o 0 0 0 0 0 0 0 0 0 0 0 o e a o O o 0 0 0 0 o a o 0 0 0 0 0 0 0 o a O o 0 0 0 0 o 0 000000 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Right of Appeal Findings of Fact Prior Approval Duration and Exception 10.5 Board of Appeal SECTION 11: SEVERAl- JIFFY 0 0 0 0 0 0 0 o e o a a o 0 0 0 0 0 0 O 00000 0 a 0 0 0 0o a n 0 0 0 0 o a 0 o 0 o 0 0 a o 0 0 o n n 0 0 o 0 a O 0 0 a 0 0 e 0 o n o a a o 0 0 0 0 a 0 0 0 a a 0 0 c 0 0 0 O 0 o a 0 0 0 0 0 0 0 0 0 0 0 n o O 0 o o 0 0 0 o o 0 0 0 0 0 O 0 0 0 0 0 0 O o o a 0 0 O 0 0 0 0 0 0 0 0 c 0 0 0 0 o 0 0 0 O 0 0 0 0 a 0 O 0 a o O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 o a a o a a o o a o a o o a o o a o o a o a a o 0 o e o 0 0 0 o a o e o a o a o e o a o o a o 0 0 0 o e o a o 0 o a o a o 0 0 o a o a a o o a o 0 0 0 0 0 0 0 o e o n n o o c o o a e o 0 0 0 o e o 0 0 0 0 0 0 0 0 o a o 0 0 0 0 0 0 0 0 0 o a o 0 0 0 o a o 0 0 0 0 0 0 0 0 0 0 o a o 0 0 0 0 o a a o 0 0 0 0 0 o a o 0 o a o o O o 0 0 0 o a o o a o e o 0 0 0 0 o a o 0 o a o o a o a 0 0 0 o a o 00 0 0 0 0 0 0 0 0 0 0 0 o a o e e e a o a a. e e 0 e o 0 o a o 0 0 o e o 0 e n a O o a o a o 0 0 0 0 0 0 a o 0 o a 000000 a o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 0 0 0 0 0 n n o 0 0 0 0 o e a c o 0 0 0 0 o c o 0 0 0 o o c o a o o c o 0 0 0 o a o 0 0 o o 0 o a o c o 0 0 0 o o 0 0 0 a o o v o 0 o c o c O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 c 0 0 0 0 0 0 a 0 0 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 n 0 0 0 0 e 0 0 a 0 n a n O 0 0 a 0 0 a 0 0 0 22. 22 =23 23 23 23-24- 24 24 24 24 25 25 25 25 26 26 27 27 27 27 27 27 a 28 o n o a n o a o 0 0 0 0 0 0 o a a o 0 0 0 0 28 MASON COUNTY STORMWATER MANAGEMENT ORDNANCE SECT -ON 1 o MINK S OF FACT, NEED AND PURPOSE 10 r r Tnnddfngs of flee e Board of ason County Commissioners of Mason Lour ty hereby finds t A. T994 Puget Sound Water Q -Jollity Management Pan (as amended, requires all counties and cities within the Puget Sound drainage base to adopt ordinances to con:roL runoff from new development and redeve&opment by January I, 1995. The an &so directs ocagovernments to adopt stormwater programs, which include minimum requirements for new development and re-deve:opment set by the Plan and in guidance developed by 'neology. 0 Stormwater is a probeem associated with land utilization and deve occ .. trence of potentiapoIudans such as pesticides, ertiizers, petro wastes and numerous others 1 opmeLt a eum prod id common o r cts, anima_ Land utilization and development is aso known to increase both the volume and duration of peak flows. The resulting erosion, scouring, and deposition of sediment affect the ecological balance in the stream. Sedimentation and stormwater pollution cause diversity of species to decrease and allows more tolerant (and usually 4ess desirable) species to remain. Stormwater po. ution can cause or contribute to closures of shellfish beds and swimming beaches and other restrictions on pubic use of the waters within Mason County. C o An expanding populatio_ end increased development of land have led to: water quality degradation through discharge of nutrients, metals, oil and grease, toxic materials, and other detrimental substances including, without limitation, insect and weed control compounds; drainage and storm and surface water runoff problems within Mason County; and safety hazards to both lives and property highways. ways° osed by uncontrolled water runoff on streets and D. Continuation of present stormwater practices, to the extent that they exist, wL_ qua lity degradation, erosio i, property damage, and endanger the health and ieahabitants of the Cour ty IRa Tn the future sue future developers, problems and dangers wibe reduced or avoided is both private and pub ic, provide for stormwater qua ead to water s afe ty of the exising properties and ity and quantity controls. MASON COUNTY STORMWATER MANAGEMEIC T ORDINANCE a Stony water quality and quartty con cols can De achieved .oy impementifg appropriate best management practices land is developed or redeve BMPs\,e 0 oed Coo Best marLagerent practices can be expecied to perform as intended only w1_en properly designed, constructed andmaintained Nees lie County finds that this c1 apter is necessary in order to: A. Satisfy the mar date of Eco ogy as identified in Sectio B o Minimize or eliminate water quality degracationo C e Prevent erosion and sedimentation i A. creeks, streams, ponds, III. Protect property owners adjacent to existing and develop of increased runoff ra Wes Preserve and enhance the suitabi uses. Qeserve and enhance Go Promote so - sediment. J o ity of waters for con %ac He aesthetic qra nd deve_opmen: 00 ity of the water. ng a ces a d other water bodies ands from tile ,ndesirabye impacts recreation, fishing, and other beneficia icies which respect and preserve County surface water and Ensure the safety of County roads and rightsoof wayo Decrease s ru_ioff. orrnwatermrelated damage to pub is and private property from existi To protect the health, safety and welfare of the inhabita.:s of the County. o3 Purpose g and future The provisions of this ordinance are intended Wo guide and advise awho conduct new deveopmen: or redeveoprent wits bn Mason County. he provisions of this ordinance estab_ish -he minimum :eve: of compiance, which rn.us , be met to peT Tent a property to be developed or redeveloped within Mason County t is the purpose of his Chapter to: A. Mirimize water quality degradation and sedinien other water bodies; 2 ation ir strearns, ponds, takes, wet ands and MASON COUNTY STORMWATER MANAGEMEI\ T ORD 1 N AID CE E . Mi m ° mize the impact of increased runoff, erosion and maintenance prac ,ices 0 Maintain and protect groundwater resm rces; 0 Min imiimpacts of alterations or flow patterns; Decrease poten is ands g] and sedirnen'-ation caused by land development ound and surface water quantities, locations and ide, flood and erosion damage to pub is and private property; Promote site panning and construction prac vegetationa and hydrologicaconditions; i ainvain and protect „ices gnat are consistent with natura the County stop water infrastructure and rovidc a rneans of reg±ating c water quality impacts; and earing and grading o: iv topographical, `hose downstream; to and pt b o- IC and whi Provide guidance on deveoprnent and construction procedures, which wi preservation of existing natura vegetation to the maximum extepracticab SuCTlkO -‘ 2a DIEIF o: 2 le purposes of .t IONS is cna.p ter, the following definitions shall a .pp :y a. "American Public Works Association" or "APWA" C i.apter of the American Public Works Association. eans t ae ado e. e rrni �irr,izir� g encourage tire oted edition of the Washington State b. "Approval" means the proposed work or completed work conforms to this c the Director. c. "As -grade aapter in the opinion of " means the extent of surface conditions on completion of grading. d. "Basin plan" means a plan and all implementing regulations and procedures including but not limited to land use management adopted by ordinance fly managing surface and stormwater management facilities and features within individual sub -basins. eo "riedrock" means the more or Less soid rock in ace either o i or benea± the surface of the ea.rtn. may be soft, medium, or hard and have a smooth or irregu ar surface. P" 0 3 encl" weans a re ative y eve step excavated into cart material on which fil is to be placed. -t MASON COUNTY STORMWATER MANAGEMENT ORDINANCE g. 9 4 1: est Ma a gement Practice" or 49 B 44 rnea" s p 1ysica�, strt� ct i ra_, and/or rnanageria, practices that, when used sngly or i �� cornbir ation, prevent or reduce pon 1on of water.:WIs are listed and described m the Manua roc "Buffer" iffer" means the zone contiguous with a sensitive area flat is required for the continued maintenance, -function, and structural stability of the sensitive area. Tare critical, functions of a riparian buffer (those associated with an aquatic system) include shading, input of organic debris and coarse sediments, uptake of nutrients, stabilization of banks, interception of fine sediments, overflow during high water events, protection from disturbance by humans and domestic animals, maintenance of o- life o l T � o o of a o a r o wL_C__L fe habitat, and room for variation aquatic system boundaries over thine due to hydrologic ydro_ogic or climatic effects. The critical functions of terrestrial buffers include protec liol of slope stability, attenuation of surface water f ows from storm water runoff and precipitation, and erosion cor_o i0 "Civil Engineer" means a professionaL engineer ]Engineering "Civi IEngineeringP9 means the appLcation of the mechanics and be iroperties of materials to the eva. the beneficial uses of mankind. met_ easing" means i Tlods o he destruction and remova icensed in the ate of Was 0 Lng on in Civi r know edge o: ,� e forces of nature, princ1pes o uation, design and constriction of civil, works or of vegeta do by ranual, mechanica, or chemica L 1. "Commercial agriculture" means those activities conducted on ands defined in RCW 84.34.020(2), and activities involved in the production of crops or livestock for wholesale trade. q- activity ceases to be considered commercial agriculture when the area on which is is conducted is proposed for conversion to a nonagricultural use or has lain id~ e for more than five (5) years, unless the idle land is registered in a federal or state soils conservation program, or unless the activity is maintenance of irrigation ditches, laterals, canals, or drainage ditches related to an existing and ongoing agricultural activity. mo "Compaction" means densificatioof a fill by mechanical means. ne "Critical Areas" means, at a minimum, areas which include wetlands, areas with a critical recharging effect on aquifers used for potable water, fish and wildlife habitat conservation areas, frequently flooded areas, geologically hazardous areas, including unstable slopes, and associated areas and ecosystems. oa "Design Storm" means a prescabed hye:°graph and total precipitation amour t (for a specific duration recurrence frequency) used to estimate runoff or a hypothetical storm of interest or concern for the purposes of analyzing existing drainage, designing new drainage facilities or assessing other impacts of a proposed project on the flow of s i,irface water. (A hyetograph is a graph of percentages of total precipitation for a se�°ies o- time steps representing the total time curing which the precipitation occurs.) pro 99 Jetenlion99 means the release of stormwater runoff from the site at a slower rae tE by the stormwater facility sys tem, the difference being held in temporary storage an it is co ectec MASON COUNTY STORMWATER MAID AGEMEI\ T ORDII\ ANCE qa "Detention facility" means an above ground or below ground faci�i1yy, sucF as a pond or tank, that temporarily stores stormwater r! no : and subsequent y releases it arc a slower rate than it is coec:ed by he drainage facility system. 'here is little or no infi t-Aation of stored stoner water° ro ""D recto_A"" means the Masor Co 0 :ainance0 0 so ""Drainage asiL� Co: P � blic works Direc nor or a designee who sha " means a geographic and to "arth material" _means any rock, natu. u0 "Eco_ogy" means the Was vo "" Engineering geo ogis a ydro 0 sot ogic subunit of a waters ed0 or fill and/or any combination there° ingtor State Department or Ecology. " means a geo ogistexperienced and knowledgeab vv. "Engineering geojogy" }-he appication of geo,ogic know investigation and evaluation of naturally occurring rock and soil for use i e flJ 0 engi 0 adrninisiter this 0 eering geo O gy edge ald principles in the 0, design of civil works O " x0 ""Erosion"" means the wearing away of the _and surface by ru nni lg water, wind,ice, or other geo agents, including such processes as gravitational creep. Detachment and movement of soil or rock fragments by wafter, wind, ice, or gravity. yo "Excavaion" rears he mechanic._ removal of earth materia z0 "Existing site conditions" means 0 (1) F'or developed site with stormwater facilities that have been constructed to meek standards in the Minimum Requirements of this ordinance, exis Ling site conditions shall mean the existing conditions on the site. (2) For developed sites that do not have sto- er facilities that meet the Minimum quirements, existing site conditions slam 1 mean the conditions that existed prior to local government adoption of a stormwater management program. If in question, the existing site conditions shall be documented by aerial photograph records, or other approw3riate means. (3) For al sites in water quaity sensitive areas as identified unde-.A Minimum Requirement ##7, Water Quai.ty SeLnsitive Areas, existing site conditions sha meal undisturbed forest, or the purpose of caatir g runoff charac tensues. I' �� Or a sha__Y T undeveloped sites outside of water qua' mean le existing conditions on the sLe. aa0"F xperimental IMP" mean Ecology in co ,aboration wit h 5 sty sensitive areas, existing site conditions s a BMP that has not bee--i tested and eva _local governirents and tec_nical_l exiles is uated by he Department of MASON COUNTY STORMWATER MANAGEMENT ORDINANCE b b ° ° 1� i D D means a depose earth material yo_aced by artificial means. cc. 'Forest F orest practice" means any activity conducted on or directly pertaining to forest :and and relatir, g to growing, CJ (2) (3) (4) (5) (6) (7) (8) o i_arvesting, or p:ocessing timber, incu ing but not -united to: O s' oad and tray_ construction. Harvesting, final and intermediate0 Precommercia_ thinning. Reforestation_. erti�ization0 Preventios and suppression of diseases and insects. Salvage of trees. Brush controy0 dd. "Frequently flooded areas" means the 1 OOdyear ► oodp_ain designation of the -cede a Management Agency and the National :Food Insurance Prograrn0 r,mergency ee0 °°GeoLogicaLy hazardous areas' means areas that because of their sisceptibiLity to erosion, sliding, earthquake or other geological events, are not sui teci to the siting of commercial, residential or industria: devei opment consistent with public hea iih or safety corn-cerns 0 ff. "Grade" means the slope of a road, c^_annel, or natura= groun.d0 ^tie finished surface of a canahed, roadbed, top of emba anent, or bottom of excavation; any surface prepared for lie support of° coion such as paving or the laying of a co: duit0 (1) Existing Grade. The grade prior to grading. (2) Rough Grade. The stage at which the grade approximately conforms to the approved plan. (3) Finish Grade. The final grade of the site which conforms to the approved pyan. gg "Gradient terrace" means an earth embankment or a ridgeoand=channey constructed with s .itable spacing and an acceptable grade to reduce erosion damage by in-ercepting surface runoff and conducting it to a suitable outlet at a nor erosive veiocitye hh. (To) "Grade" means to finish the surface of a canal bed, roadbed, top of embankment or bottom of excavation. ii. "Ground water" mea surface water body. ns water in a saturated zone or stratum beneath the surface of :and or beneath a J D °° Hydroperiod°° means the seasona_ occurrence of flooding and/or soil sa depth, frequency, duration, and sea song; pattern of inundation. uration; it encompasses l�l�D °°-rnpervioi s surface" means a hard surface area which either prevents or retards the entry o_f water into the soil rnan le as under natura_ conditions prior to development, and/or a ha: surface area which � inG D causes water to run off tine surface greater q �.�antities or at aniLr� creased rate of flow from the flow 6 MASON COUNTY STORMWATER MAIN AGEMENT ORDINANCE present under naturaconditions prior to deveopment Common impe:vious surfaces incude, but are not limited to, roof tops, walkways, patios, driveways, parking lots or storage areas, concrete or asp. a it paving, grave roads, packed earthen materials, and oiled, macadam or other surfaces which simiiar�y impede the riaturainfiltration of stormwatero Open, uncovered reyc:Ltion/detention facilities shal rot be 0 0 considered as inn pervious surfaceso PCicit discharge' eans anon=stormwater discharges to storn: contribute to a vioP tion of state water quality9 sediment quadLey iEc� ding but not limited to sanitary sewe: com ections, indastria car washing and greywater systems. 0 water drainage systems that cause or or ground water quality standards, process water, i :eriorr EMT draii s, mmo " rterf ow" means that portion of rainfa`1 that infitrates into soia Id moves yateraLly through te apper soil horizons untiintercepted by a stream channel or until it returns to the surface, for exampe, in a wetand, spring or seep. nno "" If ,and disturbing activity" means any activity that results in a cgange in the existing soicove: (both vegetative and nonvegetative) and/or the existing soil topography. ',and disturbing activities inch ode, but are not ii_n.ited to demolition, cons ruction, clearing, grading, frire g and excavation. oo. " ,arge Parcel Erosion and implement BMPs to control po Guidance for preparing a Large Sediment Control Pan" or "Large ParcePlari " means a plan to Litton generated during land disturbing activity. rarcel ESC Plan is contained in the Manua:o pp. "Vandal" means the Latest edition of Washington State 1co1ogy" s Stormwater Management valua nor the Puget Sound lasin. °the: terms frequently used to mean "the Manual" include; the PSWQ Manual, and the Technical Manua o The Manual is adopted with exceptions in Section 6 County's Stormwate: Management Ordinance. qq. "Mitigation means, in the foTowing order of preference: (a) Avoiding the impact a oge e by ot taking a certain ac of Mason ion or part of an action; (b) Minimizing impacts by limiting the degree or magnitudc of the action and its implementation, by using appropriate technology, or by taking affirmative steps to avoid or reduce impacts; (c) Rectifying the impact by repai:i:ig, re habi L itatirg or restoring taffected environment; (e) rr0 "N atura .educing or e,imin ating the impact over time by preservation and maintenance operations during the ife of the action; and Compersation for the impact by replacing, enhancing, o or environmcr is ocaiion" means t providing substitute :esoucces e ocation of those channeµs, swales, and other rr on rani ade conveyance systems as defined by the first doc me rted topographic con tours existing for O e suba ect property, either iron 7 maps or photographs, or such other Icans as appropriate. MASON COUNTY STORMWATER MANAGEMENT ORDIN ANCE sso "Permanent Stormwater Quality Contro (PSQC) Plan" means a plan which incudes permanent BiV-Ts for the control of po»u:ion from sto-cmwater runoff after construction and/or and disturbing activity has been compie to d o For small sites, this requirement is met by implementing a SmaParcel Erosion and Sediment Con P aro Guidance on preparing a PSQC 1 1ar is cortained in the Manua�o tt0 "Person?' means any individual, partnership, corporation, association, orgathzatio- ., cooper.':ive, pub or municipacorporation, agency of the state, ocaL govern,'nei t unit, howevedesignated. 1e o "Poution°° means contaminated or other ateratiorn of the physica chemical, or bioYogical properties, of waters of the state, including change in ter'ipera urc, taste, color, t��rb�dl�i�y, or odor of tie waters, or such discharge of any -iquid, gaseous, solid, radioactive or other substance into any waters of the state as will or is likely to create a nuisance or render sicirwaters harmfu�, detrimental or injurious to the public health, safety or we fare, or to domestic, cone inctastrial, agiricuitura�, recreational, or other _Legitimate beneficia uses, or to livestock, wild animals, birds, fish or other aquatic �ifeo vv. "Prod; ect Engineer" means, the proponents Engineer or Engineer's representative wdirecfy supervises the engineering and admmmis :ration of a eons tru c for project wvva ° ° Iced eve_opment° ° means, on ar already deve` ()Jed site, tile creation or addition of impe: vio is surfaces, structural development including construction, installation or expansion of a building or other structure, and/or replacement of impervious surface that is not part of a routine maintenance activity, and land disturbing activities associated with structural or impervious redevelopment. xxo °°iegional retentionldetention system" means a stormwater quantity control structure designedto correct existing excess surface water runoff problems of a basin or sub -basin. The area downstream has been previusly identified as having existing or predicted significant and regional flooding and/or erosion problems. This term is also used when a detention facility is used :o dctain s :ormwater runoff from a number of different businesses, developments or areas within a catchment. yy. o "Residential Si :c Improvement Plan" means a plan which shows how stormwater runoff impacts from the completed residential development will be controlled after construction. zz. "Retention/detention facility (R/D)" means a type of drainage facility designed either to lold water for a considerable length of time and then release it by evaporation, plant transpiration, and/or infiltration into the ground; or to hold surface and stormwater runoff for a short period of time and then release it to the surface and stormwater management system. aaao "Site:" means the portio of a piece of property, which is direct y su0 ect to developrr en bbb. °° ST ope" means the degree of deviation of a surface from the horizonta; measured as a numeric._ ratio, percent, or in degrees. Expressed as a ratio, the 1rst number is the horizontal distance (run) and tie second is the vertical_ distance (rise), as 2: o 2: slope is a 50 percent slope. expressed in degrees, the slope is be angle from the horizontape, with a 90° slope being verticay (maximum) and a 4.5° eing a 1:1 or 100 percent s`opeo 8 MASON COUNTY STORVIWATER MAN AGEME\ T ORDINANCE ccca "Sma41 Farce. r.rosior and Sediment Cort:oPar" or °° SmalParceH SC 17 1ar°° means a par for small sites to implement temporary BMPs to control pollution generated dun ,g the construction phase or�y, primariyy erosion and sediment Guidance for preparing a Sinai ?arcel IE SC Par is cortainin the Manu a= dddo "Soi"° means the unconso=idated a ireraand organic materia that serves as a natural redi-urr _nor growth of -and p< ants. on the immediate surface o the cacti eeeo "Source control : MP" means a BMP that is intended to prevent poltants from entering stormwater. few examples of source contro_ BMPs are erosion control pracices, maintenance of stormwater facLities, constructing spoofs over storage and working areas, and directing wash water and similar discharges to the sanitary sewer or a dead end sump. fffo "Stormwater" means that portion of precipitation that does not natura._ly percolate into the grour or evaporate, but flows via overland ►► ow, interflow, channels or pipes into a defined surface wate � a�o channel, or a constructed infiltration r�a.ci itya d gggo "Stornawater eirailage system" means constructed and nayurafeatures whic-- function ogether as a system to collect, convey, channe�, hoyd, inhibit, retain, detain, infiltrate, divert, treat or filter stormwater. high. "Stormwate: faciity" means a constructed component of a stormwater d rair age system, designed or constructed to perform a particular function, or multiple functions. S':ormwarerr facilities include, but are not irited to, pipes, swales, ditched, cuvert, street gutters, detention basins, constructed wetlands, infiltration devices, ca,chbasins, oil/water separatos, sediment basins and moduar pavement. iii. "Stormwater Management Manual" or "Manua_" means Chapter 2, adopted by reference and prepared by Ecology t pollution. 0 the Manua y, with the exception of 'Vol.1 -"at contains TVPs to prevent or reduce jjj• "Stormwater Site Plan" means a pan which includes an 114,rosion and Sediment Control CESC) Plan and/or a Permanent Stormwate: Quaity Control Plan (PSQCP)O For small sites (less than 2000 square feet of new imperviousness), this plan requirement is satisfied with a Small Parcel Erosion and Sediment Control Plan. For residential sites creating 2000 square feet or more of new impervious surfaces, a Small Parcel Erosion and Sediment (NSC) Control Plan, and a Residential Site Improvement Plan (including a written descri tion o the s roosed level o rment will be reuired to be submitted or Coun review and approval. Guidance on preparing a Stormwater Site Plan is contained in the Manua from ?ublic Works. kick. " oe of sl to horizonta 1 0 V" or if C .o pe"" means a point or _one it an excavation, c or mecrs the existing ground s op of slope" nears a point or eets the origin asurface ooeo _r t, or 1;_ vwl ere the e one on trc upper surface of a s or is available ower s lLLrface changes ope where it c ianges to horizonta MASON COUNTY STORMWATER MANAGEMENT ORDINANCE mmm° " reatmen.L IMP" means a -IMP that is intended to remove potants rrorr examples of :Treatment BMPs a:e detentio ponds, oil/ovate: separators, biofil constr ttctcd wet -ands ° s for water ° few tration swales and "Unstable s_opes" rrear those soping areas of land which have in the past exhibited, are current_y ex i Ili it g, or wit_ yIce it thefuture exhibit, mass mover -lent of earth° 000° "Water body" means surface waters incauding rivers, streams, :aloes, marine waers, es:uaries, arc wet -ands. ppp "Watershed" means a geographic region within wwh ich waier or body of water as identified and Y umbe ped by the Sate of Washi r CWRIEAs) as defined in Chapter 173 500 WA.C° c,rains ii_m a particular river, stream, ion Water Resource havetory Areas qqq "We ands" means those areas that are inundated or saturated by surface or ground water at a frequency and duration sufficient }:o support, and that under normal circumstances do support, a prevalence of vegetation y, picai_y adapted :or life in saturated soil conditions. Wetands general y include swamps, marshes, bogs, and simmi_ar areas. This hciudes wetlands created, restored or enhanced as art of a. mitigation procedure. This does not include constructed wet ands or the folowing surface waters of the state intentionally constructed on the site that are not we: ands: Irrigation and drainage ditches, ti ass lined swales, canals, agricultural detention facilities, farm ponds, and :andscape amenities. rrr° "Vegetation" means all organic plant life growing on the surface of SEC N 3 o GIENIERA IPROVISIONS Abrogation and greater restrictions le earth. It is not intended that this chapter repeal, abrogate, or impair any existing regulations, easements, covenants, or deed restrictions. However, where this chapter imposes greater restrictions, the provisions of this chapter shall prevail. 3.2 linterpretation The provisions of this chapter shall be held to be minim m requirements in their interpretation and application and shalt' be liberaly construed to serve t ye purposes of this chapter. 1100 MASON COUNTY STORMWATER MANAGEMENT ORDINANCE SECTI /v N 4: APPLICABILITY Regated activities shabe conduc Site Pyan (SSP) whics inc-udes ore A. Srnal Parce :,ed on after Masora Co nty Pubic Works approves a Storm water o: snore of the ®bowing as required by this chapter: Erosion and Sedimen 1B o Residentia Site :ni : 0 andzmpr ovemnents. Co Large farce Contro FSC) Rai ovement Plan accompanied by a written description of the proposed work Erosion and Sec' imert Contro(ESC) Plan Permaent Stormwater Quaity Control (PSQC the vr°ovosed work and improvements, ote: Sma activities creating P an accompanied by a written description of ess than 2000 square reel: o[ new irnpe viousness wil be required to submit item 6GA". Residential si'We deves opment creating more than 2000 square feet of new impervious surfaces wil_ be required to submit i _erns bbJ & I-4"o Non-residendial activities creating more than 5000 sq-Lase fleet of new imperviousness wi`i be required to submit items G6C & ', prepared by a, yicensed civil engineer° IECCTM X 5o REGULATED 4C T of Reg-B- 0 ides ated zeddv� ies V_TIES AND IL II aCDW/EL CT Consistent with the minimum requirements contained in this chapter, the 'rector odesignee siia;� approve, conditionally approve, or disapprove the following activities, unless exempted in Section 5.2 below: A. New Development 1 1 (1) land disturbing activities; (2) structural development, including construction; installation or expansion of a building or other structure; (3) /5 creation of impervious surfaces; Class V genera _ _ (ores t p1 �� ctices that are conversions from timber and to other uses; subdivision, short subdivision, ard binding site plans, as defined in CH. 5 8 o ` 7.020 RC-VV. MASON COUNTY STORMWATER MANAGEMENT ORDINANCE edeve opmer t ors r already developed site, te creation or addition of impervious surfaces, structural deveyopn ent inc:uding construction, i stay` ation or expansion of a building or other stracture, Land disturbing activity, and/or replacerneny of impervious surface that is not pa: t of a ro -Itine mairtenar ce activity, and and disturbing activities associated with a structural or irnpervrous redeye opmento 0 5 Hxcerr�ptr mns Commercia„ agriculture, and forest practices reguated under Tit e 222 WAC, except for Cass IV Genera_ forest prat -ices thai are conversions from timber land to other uses, are exempt from Ehe provisions of this chap Jero Development undertaken by the Washington Sta:e Department of T'ransporrtation in state highway of -way is reg d_ated by Chapter f 73 -270 WA C, the Puget Sound Highway Runoff P:ograrno Ali other new development and redeve opment is sub ect to t SECTION 6: GENERAL REQUIREMENTS 6.- Story water M nage:rme It M .m nunl adopted ae mir rnnum require 0 rghto :Cents of this chapter. he _atest edition of 11-t;co4ogy's Stormwater -lagement Manua with the exception of the Minimum Requirements Chapter, Voume �, Ciapter 2, is yiereby adopted by reference and is iiereinafler referrer, to as the Manual. The use of other manuals or methods shall be pre approved by the Director or thei_p designee. 6.2 Stormwater est Management Practices ()tiMPs) General: MPs shall be used to control pollution from stormwater. BMPs shall be used to comply with the standards in this Ordinance. BMPs are in the Manual. Farm Plan BMPs: For new development that will include "hobby farm', elements such as pastures, corrals, etc, farm plan LMPs are recommended (not required) for incorporation into the site design. Contact Mason County's Public WJo- cs Department or the Mason Conservation District for further arrr p_an guidance. Experimental BMPso In those instances where appropriate BMPs are not in the -Vanua, experimeata_ �MPs shouad be considered. -xperimenta_ BMPs are encouraged as a means of sowing problems in a manner not addressed by tL e Marr_uain an effort to improve stormwater qua_ipry technology. 11-4;xperirrenta- BMPs must be approved i`► accordance with the approval process outine in the Handal° MASON COUNTY STORMWATER MANAGEMENT ORDINANCE 6. LfClt discharges _;iciJ discsarges o sto �ri� wa tern drainage systems are prohibited. SEC OV4IL S-\DkRIDS 70 0 0 0 Sma1 parce rardnlimum rrcequlrremere The for lowing new deveiopmcr shay be required to contra: erosion and sediment curing construction, to permanently stabiiizc soil exposed curing construction, to comply with Sma parcel_ Recuirements 1 through 4, to prepare a Sma- Parcel F,rosion and Sediment Control War, and m.:y eed to prepare a Smal. Parcel Drainage Pan/S•ketch (Mason County°s Pubic Works )apartment can provide additional instructions, idai ce, and examples if a Small Parc& drainage PJ are is deemed :Lecessary) (a;\ Creation or addition of less than 2,000 square feet of impervious surface area. (b) Land disturbing activities of less than one acre. : Sma Constr sE a_= be PasceRec ufirement C©irstrrue olir Access Route ction ve hice access shall be, wlenever possibe, lunited stabilized to minimize the tracking of sediment ono pub `Yo one route. Access points ic roads. wherever constriction vehicle access rou les intersect paved roads, provisions mus l be made to minimize the transport of sediment (mud) onto the paved road° If sediment is transported onto a road surface creating a hazard, the roads shall be cleaned immediately, and t 1oroughly cleaned at the end of each day. Sediment shall be removed from roads by shoveling or sweeping and be transported to a controlled sediment disposal area. Street washing shall be allowed only after sediment is removed in this manner. 7.102 Small Parse 0 equfemce t #2 St bilizat on of Potentially Errodiftlie Denuded Areas Soil stabilization. All exposed and unworked soils with erosion potential shall be stabilized by suitable application of BMPs, including but not limited to sod or other vegetation, plastic covering, mulching, or appication of ground base on areas to be paved. Al ]MPs shad be selected, designed and maintained in accordance with an approved manua From October " t:rough April 30, no soils sha4_ remain exposed for more than 2 days. 1-4 Aom May 1 thro-ygh September 30, no soils shad remain exposed :or more than 7 days. 713Sm2 0 13 Parcel "Requirement #3 P`rotectfiorl of Ad j adder L rropeflies dj acertt properties sha: be protected from sedime deposition by appropriate use of vegetative Duffer strips, sediment barriers or filters, dikes or muchig, or by a corgi biro atioiof these measures and other appropriate BM -Ps. MASON COUN TY STORMWATER MANAGEMENT ORDINANCE 7©1 oA Smell '' arced legwirement #4 0 0 aintenance erosion and sediment control BI\ or authorizedagent to ensure contir : 5 Smc Reg Ps shad be regu arly inspected and maintained by the ovvre ,,_ ed performance of their intended function. irrCement 5 Othe:r IBM } s As required by the Director, other appropriate 13MPs to sha _ be appie ° Litigate the effects of increased ru.4'»o 7.2 NEW D H V I U AJCDPY \ 11 AND REDEVELOPMENT = l 1 \ i( 7.2 REQ R Y.Eh 11 S r 1 Deve,o�pment of individual, detached, single farm y residences and d ip.exes exceeding 2,000 square fee of impermeable surfacing must have a Simi Parce_ Erosion and Sediment Contro P an, and a Residential Site :mprovement Plan Cwhich includes a wri lien description of the proposed work aiid deveop-Tent) prepared and submitted for County review and approval. N onoresideniai development exceeding 5,000 square reet of imperrneabLe surfacing, and -an d disturbing activities of one acre or more must have the large Puce_ ESC Pan (if required) and the Permaeent Stormwater Quaity Contro (PSQC) P_an Of ed) prepared and stamped by a licensed civi engineer. Z New Development A. A_ y new non-residentiar development that includes the creation or addition of 5,000 square feet, or greater, of new imperviou s surface area, and/or land disturbing activity of one acre or greater, shall comply with Minimum iequirements # 1 through # 11 in Sections 7.2.3 through 7.2.13. Compliance shall be demonstrated through the implemen _a ion of an approved Stormwater Site Plan consisting of a Large Parcel ESC Plan and a PSQC Plan, as appropriate. B. All new non-residential development that includes the creation or addition of 5,000 square feet, or greater, of new impervious surface area, and land disturbing activity of less than one acre, shall comply with Minimum Requirements #2 through # 11 in Sections 7 ° 2 ° 4 throug`i 7.2.13 and the Small Parcel Minimum Requirements found in section 7.1 above° _This category of developme t shall also prepare a Stormwater Site Plan thai includes a Small ParceErosion and Sediment Contro: Plan. Compliance sha be demonstrated through the implementation of an approved Stormwater Site Ran that incdes a Sma-- Parcel Erosion and Sediment Cont- Pan and. a PSQC Piano C ° li new residential development and redevelopnnent (individual, detached, single family residences and (1p-exes) that includes the creation or addition of 2,000 squads feet, or grea-er, of new impervious surface area, sha;_ prepare a Small Parcel Erosion and Sediment Control Plan which comp ies with Minimum Rea uirements 141 throng'. #5 in Sections 7 ° LL 0_ through 7 ° - ° 5, and MASON COUNTY STORMWATER MANAGEMENT ORDINA CE shall prepare a Residential Site Improvement Plan which incudes a written desc:iption of the proposed work and development. The Small Parce- Erosion and Sediment Control Plan along with Cie Residential Site Improvement P _an should show and describe how developnc ent ifacts are proposed to be mitigated. Compliance sha Sediment Contro 7.2.2 Redeye ©Talent be demonstrated throug'i the impementation of approved Erosion and P 0 an, and a Residen�na. Site in proverert ?1ano A. Where non-residentia redeveopment of > 5,000 square feet occ4rs Tie new development Minimum Requirements Il 1 thro gh # ; ; , S ectioir,s 7 e 2 0 3 through 7 0 2 0 " 3 , sha;apply to that portion of the site that is being redeveloped, and source control &VIPs slrnal be app-ied to tll_e entire site, incT ding adjoining parcels if they are part oL the profecto A Stor�rnwater Site Plan s �a- be prepared. B a In addition to 1U20e above requirements, where one or more of the following condhtiorns apply, a Stormwater Sic Plan sha also be prepared that incudes a schedule for implementing the Minimum Requirements to the maximum extent practicable, for the entire site, inci acing adjoining parcels if they are part of the pro f ecto An adopted and imp:emented basin pan (Minimum Requirement #9) may be used to deve-op redevelopment requirements that are tailored to a specific basin. 10 Existing sites greater than 1 acre in size with 50% or more impervious surface. 2. Sites that discharge to a receiving water that has a documented water quality problem. Subject to local priorities, a documented water quality problem includes, but is not limited to water bodies: (I) Listed in reports Tequired under section 305(b) of the Cean Water Act, and designated as i-iot supporting beneficial uses; (ii) Listed under section 303(d) of the glean Water Act as not expected to meet water quality standards or water quality goals; (iii) Listed irn Washington State°s Nonpoint Source Assessment required under section 3 1 9(a) of the Clean Water Act that, without additiona action to control nonpoint sources of pollution cannot reasonably be expected to attain or maintain water quadty s:andards `iv) 3. Sites where the need for additional stormwater conyro:. measures hes been identified through a basin plan, the watershed ranking process under Ch. 400=12 W & C, or though Growth ?vanagement ct panningo MASON COUNTY STORMWATER MANAGEMENT ORDINAT CE 7 2.3 Minimum Require:. ER 1 SI IN AND SEDIM C NTROIL 1, new develop_I ar_d redevelopment that includes and disturbing activities of one acre or greater shall comply with Erosion and Sediment Control Requirements 1 through 14, below. Connplla:ice With tie Erosion and Sediment Control Requirements shall be demonstrated through imp ementation of a Large Parcel Erosion and Sediment CContrro RLan0 All new development and redevelopment that includes and disturbing ac tivi lies of <1 acre s� gal comply with the SmaJ Parcel Minimum in um requirements found in section 7. ` , above. Con_pLiance with the Srr ail Parcel Requirements shall be (Lemont through er entation of a Sma Puce LL Hrosion and Sediment control Plano The following erosion and sediment control reciuirerrents shall be met: EROSION AND SAID Sediment Trappling Cap TR IL REQU St .bibs tkon and A 1 exposed and unworked soils shall be stabilized by suitable application of BMv1Ps0 From October to Awl 30, no exposed and unwo:Qlked soils shall remain unstabilized for more than 2 daysa 'rpm May 1 to September 30, no exposed and unworked soils shall remain unstabilized for more than 7 days. Prior to leaving the site, stormwater runoff shall pass through a sediment pond or sediment trap, or other appropriate 3MPs0 EROSLO N A ND SLH IfD and Easement Unfits -VriENT CONTROL TROL R1EQUREY.K\ T #2: elineate e Theancr g n the field, mark clearing limits and/or any easements, setbacks, sensitive/critical areas and their buffers, trees and drainage courses. C. EROSI N AND D SEDIME S T CONTROL REQUIREMENT #3: Protection of Adjacent Properties ® Properties adjacent to the project site shall be protected from damage by sediment depositiorn D. EROSION AND SEDIMENT CON ROL REQUIREMENT #4: nailing nrfd 0 `1I StabLizz km of Sedirn©n t rapping easaires Sediment ponds and traps, perimeter dikes, sediment barriers, and other BYPs inyended to trap sediment o , -site shall be constructed as a first step in grading. These C> MP s shall be functional before Land disturbing activities take place. IErthen structures such as clams, dikes, and diversions shall roe seeded and mulched according to the timing indicated rrr Erosion and Sediment Control Requi:ennent If 0 MASON COUNTY STORMWATER MANAGEMENT ORDINANCE ado E L'Z OSI :i AND SLED 0 0 20 l Cut and�ri_l s �n addition, s Requirement opes sha. opes ss a fl1. :VENT CC O Y 1L 't OL RE -1 UIREME `11 #5 o CL- be desigred and constr 1 be stabilized in accorda �sctec it a manner rce with Erosior t and Fill Slopes that vvij miry imize erosion acid Sediment Control Stipp emental Guidelines: Consideration shod cl be given to the eng yh and stcepn ess of tire slope, the soitype, upsiope drainage area, ground water conditions, and other applicable facto- so Slopes which are found to be eroding excessively within two years of construction must be provided with additionalslope stabilizing measures Da L the problem is corrected. Roughened soil surfaces are pre erred to smooth -daces on s Chapter Y_-5). nterceptors (see B?v P E2.55 in Chapter II 5) shou s a opes (see BMP E2035 in d be constructed at the top of org steep opes, whic a have significan drainage areas above fie slope. Diversions or terraces may Y so be used to re ' �,�ce slope eng'L 3. Concentrated stormwater shoud not be aowed to flow down cut or fill slopes unless contained within an adequate temporary or permanent channel, or pipe slope drain (see MP E2025 in Chapter I =5). 4. Wherever a slope face crosses a water seepage pane, which endangers the stability of the slope, adequate drainage or other protection shot, d be provided (BMPs E2.30 and E►E,2 0 7 5 1 n 0 Chap =5) 0 EROSION AND SIhL Erosion /LE Y E1 CCONTRO 114 RQ !. IIR.EME \ YJ1v #6: CCor :_roihra g Off=sfifr Properties and waterways downstream from development sites shag_ be protected from damage by erosion due to increases in the volume, velocity, or peak flow rate of stormwater runoff rom the project site. E SION AND SE I I ENT CONTROL REQUIREMENT #7: Stabilization of Tempo i i1.y Co _, iveya.nce Ckanne!s and Ill lets 1 temporary on -site conveyance channels shabe designed, construe ed and stabilized to prevent erosion from the expected velocity of the peak f ovw from a 20year, 24-hour frequency storm for the developed condition. Stabilization adequate to prevent erosion of outets, a dj acent strealTnbarnks, s conveyance systems° opes and dowrs -ream reaches shall be provided a 'she outlets of al- MASON COUNTY STORMWATER MANAGEMENT ORDINAN CE H. EROSION AND S 6 .D Protection 0 0 VENT CM-TROIA U REV-- ENT' 1 o Stor ra• in a niet Astorrn drain ir=lets made operab;e during constriction sha be pro elected so eat stormwater runoff shall not be discharged offsite or be introduced in'zo any area wi first ed or otherwise treated to remove sediment. EROSAND 5 Consts ctfiom KID VENT CO \ 1�L OE RKQUi 'k The construction of underground uti. ity ines sha (I) No more than 500 feet of trench sha made to protect against adverse s to2 Yn /LVN #9: Underground, Uti be subject tote fo be opened at one time, un water impacts. 0 owing c:iteria: ess provisions a (ii) Where consistent wi h safe .:y and space considerations, cxcavatecmateria placed on t1hc tphi _i side of trenches. (iii) Trench dewatering devices shall discharge into a sediment trap or sediment poi do sha ity e be J. EROSION AND SEDIMENT CONTROL REQUIREMENT #10: Construction Access 0 Routes Construction vehicle access sha = be, wr enever possibe, shall be stabilized to minimize the trac imited to one route ding of sediment ono pubic roads. 0 ccess poir is Wherever construction vehicle access routes intersect paved roads, provisions must be made to minimize the transport of sediment (mud) onto the paved road. If sediment is transported onto a road surface creating a hazard, the roads shall be cleaned immediately, and thoroughly cleaned at the end of each day. Sediment shall be removed from roads by shoveling or sweeping and be transported to a controlled sediment disposa area. Street washing shall be allowed only after sediment is removed in this manner. K. EROSION AND SEDIMENT CONTROL REQUIREMENT ##i Temporary ¶MPs Removal of All temporary erosion and sediment contro3MPs shay be removed within 30 days after flrr�z site stabilization is achieved or after the temporary BMPs are no _o: ger needed. 'wrapped sediment shad_ be removed or s t abLized on site, ;at shall be permanently stabilized. L. EROSION AN 1 SEDIIMEYT COYTRO Constnactforra Sfltes 18 rench dewa o.:euri n devices sha arbed soi areas resulting from remova REQU'REYEN7 a ` 1 be discharged in a manner tha ew.trrrllrl g not adversely affect MASON COUNTY STORMWArl ER MANAGEMENT ORDEN ANCE 4�oving streams, drainage systems or offsite property. Water disc la:ged from dewatering purips sha1 be routed through a sediment pod or trap un ess it is cs eare 1Vi EROSTI O \ kNED SAD EVEN II CLtD [4 flREQUs_lEIVIEN #13: Contr o of Po 0 Other Than Sediment on C oms tnuction S ° tes AL poluta- is other than sedin ent that occ t1r ors -site during constrLctiorsha1 be disposed of in a manner that does not cause contamination of stor_rxmwatero E(OS1I N AND SAD 1 Mi '1I_' CONTROL REQ1 HREMEN 1 Lutan .and teal_ ale 4 o Via ftn tenac A l temporary and permanent erosion and sediment controBMPs sbe maintained arid repaired as needed and in a timely manner to assure continued performance of their intended function. maintenance and repair shad be conducted in accordance with an approved manual O. ERGS OAND S H D YH d\ I C0N lr 2 Off REQU IRILITEILnan efia_ LLfigibUt y Performance bonding, or other appropriate instruments, may be required to enstre compiance with the approved erosion and sediment contro, pi.ano 7 2.4 �fiffli rnur Requil natiura emet #2: Preservation of at arc- .li 0 Dr n ge Systems N aturadrainage patterns shall be maintained, and discharges from the site sha .cation to the maximum extent practicabe. 7 2.5 Vinhnum Requftrr'ement #3: Source Con 0 roil of Poll utton occur at the Source control tViPs shall be applied to aprojects to the maximum extent practicable Source control BMPs shall be selected, designed, and maintained according to an approved manual. An adopted and implemented basin plan (Minimum Requirement #9) may be used to develop source control requirements that are tailored to a specific basin, however, in a: circumstances, source control BYPs shall be required for all sites. 7.2.6 Yiniimum 0 Req u irr°em e mofr ITrr©atrfirmernz projects shah provide treatment of stormwater. 'Treatment s sha be sized to capture and treat the water quaff i 1y storm, defined as the 6 month, 24 hour storm. The first priority for treatment of stormwater shalj be to infiltrate as much as possible of the water quality design storm into tie ground. (InfiIration 1BMP's practices ski be in accordance with Chapter :II-3 of the PSWQA :Vanual) Pretreatment of stormwater prior to infiltrratior_ into the ground may be required in cases where MASON COUNTY STORMWATER MAID AGEMENT ORDIN AI\ CE D �e s t omwater contains high concentrations of D r move thrroug1 soLD 2. I he stormwater contains arge amounts o- in tire bash rD The o r r 3 D ll he sof_s are extreme�y pervious and wit t for some gravey C - ype Ore) soiso ndesirab e disso D sediTrr ent that might c not proper y fi D ved chnca1 s that cz D og the in trative surfaces or the stormwater as i Stormwater :rreatment BMPs sha not be buit vwita natural vegeta necessary conveyance systems as approved by the Directo=r0 ae case ed buffer, except for adopted and imp_emented basin plan C)/inimurn Requirement #9 may be r snoff :reatment requirements that are taiored to a specific basin. used to ceve�oip The objectives of providing storrnwatetreatment BMPs are, or both s 'rface anc ground waters, to protect the quaity and quanti ty, to alow attainment of the designated uses, and to meet s late standards prop iulgated under Chapter y 73 of the Washington Administrative Code. 7.2.7 V finfrnum Requirement #5: S t reamb&mk IK rrosfi®m C©_eo The requircmen: beow applies only to situations where stormwater runoff is discharged directly or indirectly to a stream, and must be met in addition to meeting the requirements in Minimum Requirement 44, Runoff Treatment 13�MPs: Stormwater discharges to streams shall control streambank erosion by limiting t le peak rate of runoff from individual development sites to 50 percent of the existing condition 2-year, 24-hour design storm while maintaining the existing condition peak runoff rate for the : 0- year, 24-hour and 100-year, 24-hour design storms. As the first priority, streambank erosion control 1MPs shall utilize infiltration to the fullest extent practicable, only if site conditions are appropriate and ground water quality is protected. Streambank erosion control BMPs shah be selected, designed, and maintained according to an ao roved manual. Stormwater treatment BMPs shall not be built within a natural vegetated buffet, except for necessary conveyance systems as approved by tie Director, and main rained according to the Manual. An adopted and i emen teal basin pan (Minimum Requirement 119) may be used to deve=op streambank erosion controrequirements that a:e tailored to a specific basin. 20 MASON COUNTY STORMWATER MANAGEMENT ORDINANCE 0 linlima ITt Ilep uiremeri #6: We' affildS Stormwater discharges to wet_ands sha_1 maintain e wetland's natura. Lhhydroperiod and 'lows to the extent needed to preserve or enhance its existing functions and va_i es. Prior o p_Aoposmg discharge or higher volumes or stormwater to a wetiand, a-ternativc discrarge, detention, and infiltration practices located in areas outside the wetland shall be evaluated and employed by the Project Engineer where feasible and practicable. hese requi ements app y 'o existing natura wet ands and wetlands c eated as mitigatio for loss of wetland acreage° wetlands constructed and operated solely for use as stormwater treatment / storage areas are exempt from these and most offer restrictions that apply to natural wetlands. Constr- cted we2`lands may lose this exemption if not operated and maintained as stormwater areas 'or three or more years. a tr er loca state, or federal we/Land protection requiremens may ayso apply 7 2.9 M finfmu:ui tecillafirremeat 7o Water Qmaallity Serffislitfivc Areas 0 Where the Mason County Commissioners or their designee determine that the IV iniir �m Requirenien do not provide adequate protection of wa:er quality sensitive areas, either o: = site or within the basin, more stringent' contro-s shall be required to protect wa'ser quality. An adopted and implemented basin plan (Minimum Requiremen': #9) may be used to develop requirements for water quality sensitive areas that are tailored to a specific basin. 7 20 ` 0 M. kra fimum Ilequiremer t & o 01T-Sfite 2f nalyslls grad M tfiagtion DOWNSTREAM AINAILYSIS MAY T GGER AD It'ITIONAL REQUIIRtHW :TENTS The Project Engineer shall provide a detailed qualitative analysis of the flow path of the discharge from the project site to the receiving water. Ibis requirement shall apply to all projects where a Drainage and I-4;-Aosion Control Plan is prepared, including those proposing retention facilities. 'his analysis shall include flow routing, and provide existing pipe and channel sizes and estimated capacities. In addition, the Project Engineer shall discuss any known or expected downstream erosion, flooding, or water quality problems, including those that may be caused by interflow from the proposed retention facility. The Director or designee shall have the discretion to specify the distance and level of detail to be provided by the Project Engineer. In making this determination, the Director or designee shalt' consider such factors as the relative size of the new development, availability of other hydrologic work for the drainage area, and the extent to which stormwater generated on the prod ect site is to be a tratedo Based upon this analysis, the Pro Project Engineer may determine or the Director or designee ay :require that a quanti dative analysis of the conveyance system be performed both upstream and downstream of the project site. A quantitative analysis will not be required for most projects that propose to infiltrate most or a" stormwater. this analysis snail determine conveya -ice system peAfo rnn aic ce for the app-ropriate design eventCs) both with and without the MASON COUNTY STORMWATER MANAGEMENT ORDINANCE proposed development. he Director odesignee shall have the discretion to speci y the distance and _eve` of detail to be provided by the Project Engineer. the Director or designee shall consider factors such as the relative size of the new development, avai` ability of other er hydrologic work for the drainage area, and the resu-ts of he qualitative ysis, in making this determination The quantitative downstream anayysis wiinclude rnodeli_ng tie iEydrau_ics ache proposed project and aother sources of runoff tributary to the receiving water body for the appropriate Design Event. The Pro; ect Engineer sha:: include an ana,ysis of the impact of the 24=hour, 1 OO-year event (in additionto "Design Event" anaysis) for each component of the system incuding pond spi!way. The Director or designee may impose stricter discharge and/or detention standards if the discarge rom the p: oo ect, evaluated in the context of other existing condi yions in the drainage area, is reasonab`y expected to result in au of the foowing o oodinr o II ,oss of aquatic habitat due either to ° Property -Damage o Water quality probems o H,rosion ° 0 an_ unacceptable interruption of vita or OW -LOWS 0 services �f the Project hgineer Con Director or designee) determines that greater treatme-at, infiltration and/or storage volumes, lower release rates, or downstream improvements are needed, he/she shall specify project design criteria or other means bo relieve the downstream problems (providing that such solution will not violate minimum standards established it the Manual). Other means might include increases in downstream flow capacity and/or offsite detention and infiltration facilities, plans and financing for which will be subject to the approval of the Director or designee. 7.2.11 Minimum Requirement #9 o Basin P 7.2. 0 22 Basin Plan Supersedes Manua 0 0 annthg f a proposed Project is located in a basin or subbasin for which the County has an adopi basin p;an, stormwaler requirements specifically identified in the basin p-an shay take precedence over those provided in this Ordinance° However, all other elements detailed i this Ordinance shall continue to apply to suci prod ects o G> asin Plans are required to be developed according to an approved manuia._ 2 Mhthrc u M eq firement #1 o Open atf©n L T n operation and maintenance scnedue sha .d Maintenance 1 be provided for aL4 proposed storrcwater ed facilities and BMPs, and tle party (or patties) responsible or maintenance and operation MASON COUNTY STORMWATER MANAGEMENT ORDINAL CE shabe identified. An Operation and Maintenance (O&Y) Covenant will be requi cover a;= privatey owned and maintained stormwater faci ities approved by the Di red to rector. O&M Covenant forms are available at the Mason County Pubic WoLcs office° copy of the comp;etcd instrument, sh alr be recorded with the County & uditors° Office by the proponent, and a copy of the recorded instrument is required to be submitted to the Pub t is Works Department prior to final approval of tie competed perrr^na lert stornnwater faci_itieso 7 2oi3 Minimum Regluhrernert 411 T1 a FIln mci l 0 iIlab'bilIlty Performance bonding, or other appropriate instra ments shall be required for a. projects to ensure compliance with these standards 7 2 i4 Varlarlces from These Standards 0 Va-lances rom these standards may be at;owed at the discretion of the Director orr desig- ee provided t22at the Proponent wiii substantially meet Low control and water quality goats estabished by or implicit in these standards. Comp:fiance with Ordinance requ:rements st�att normally occur within the project area, but may be per no- med as offsite mitigation in certain situations. Examples of cases when variances may be approved incAude9 but are not imited to, the fa_ owing: 2 hat the special conditions and circumstances exist which are pecuiar to the land, such as size, shape, topography, or location, and that litera interpretation of these standards would deprive the property owner of rights common enjoyed by o ier properties similarly situated; OR hat the site is being remodeled and certain site investigations woud be destructive to existing structures; 0 That remodels of existing projects which are either too small or so configured that in the Director's or designee's opinion some requirements of the manual cannot practically be met; OR That public works or private sector projects are in an existing road right=of way which is not of adequate size to install preferred BMPs and for which right-of/way cannot be expanded because of encroaching structures or setbacks for existing structures. requests for variances must be submitted it writing to the Director or designee, and must clearly state le specific SectionCs) o f the Ordinance from which a variance is requested and why. 7 a 15 ]xperri entail BYPs Experimental best management practices are declined as BMPs, which have not been tested and eva: gated fly the Department of Ecology its collaboration with ocal ,governments and technical 23 MASO COUNTY STORMWATER MANAGEMENT ORDIN AN CE experts. Some so-called - xperimenta_ B -VPs wLyl likely be mino: variauions on an existing themec In that case, hco_ogy wou;d review and approve or disapprove :he BMP in as timely a runner as possible. Where new designs are developed (examples of experimental BMPs may be found in Section - 017 2 of the PSWQA Vanua , the review w� _ be extended through the use o f a standing committee of technical experts. here persons wild review and comment on the practice, and 11�,cology withen determine whether or rot these BMPs should be approved and/o: added to t manual 7.2. Appr©va of ixper menta B. MVPs Approval to use an Experimental BMP may be granted s J ect of Ecology and - e :oca: government. If such Experiments_ B o initi& approval by the Department M Ps prove useful they may be incorporated into later editions of the Manual following appraisal of the results and appropriate technical review conducted by 1Ccoyogy in co__aboratior with _ocagovernments and oti er interested oarties. Approval to use an ape nimen: BMP wi on y be granted weire_a a suitable contingency plan using approved 3MPs has been provided by the applicant to be used in the event that the Experi menta B MIP does not perform a dequate_y addition, severa 1Fxperimenta 13-VPs have been inc: these BMPs on a trlaL basis, subject to approval by the contingency plan. In any event, use of F,xperimentay B is being undertaken so applicability and possib SECTION o kD 81 i re©tor uded in tic Manua_. eople may wish to use _ocal government and provision of a MPs is encouraged whenever applied researc. :at more information is made avai e adoption as an approved BMP liST O e to faci itate j udgemen-. on their The Mason County Public Works Director or a designee shall administer this Ordinance and shall be referred to as the Director. The Director shall have the authority to devemp and implement administrative procedures to administer and enforce this Ordinance° 8.2 Review and approval The Director may approve, conditionally a this Ordinance. Copies o_' Sections 8, 9, 10, 03 Enfor em �t autho._rnty ,he Director sha r enforce this 0 Adi 'nancea prove or deny an application for activities regulated by r r_ sail be given to al applcants. MASON COUNTY STORMWATER MANAGEMENT ORDINANCE 8.43 0 nsp etor Aactivities reg.." ated by this •rdi r ance, except those exempt in Section 5.2, are subject_ to inspection by the D i:ectoro The Director may inspect projects at various stages of the work requiring approval to determir e that adequate control is being exercised. Stages of wore subject to inspection include, but are not limited ited to, preconstruction; installation of 1-3MPs; land disturbing activities; installatior of utilities, landscaping, re- oining walls and conpietion of project. As required by the (Director, inspections and/o- es ling shabe performed by the owner or authorized agent. SECT 10h 90 kNFORCCkIV`T 9011 Genera 11--E;n orcer'nent action shall be in accordance with this Ordinance whenever a person has vioated any provision of this Ordinance. The choice of enforcement action and the severity or any penalty shall be based or the nature of the violation, the damage or risk to the pubic or to public resources, and/or the degree of bad faith of the person subject to the e:riforcement action 9.2 Stop work order r_'he Director shall have the authority to serve a pe undertaken in violation of this Ordinance: Content of Order. he order sha ry contain: son a stop wor order if an action is bei g (1) A description of the specific nature, extent, and time of violation and the damage or potential damage; and (2) A notice that e violation or the potential violation cease and desist, and, in appropriate cases, the specific corrective action to be taken within a given time. A civil penalty under Section 903 below may be issued with the order. B 0 Notice. A stop work order shall be imposed by a notice in writing, either by certified mail with return receipt requested, or by personal service, to the person incurring the same. Co Effective Date. 'Fhe stop work order issued under this Section shall become effective immediately upon receipt by the person to whom the order is directed. Compliance: IFaiure to comply with the terms of a stop work order shal_ result in enforceme- actions including, but nt lirited to, the issuance of a civil penalty: MASON COUNTY STORMWATER MANAGEMENT ORDJ A- CE 92 Civil Penalty A person w so fai terms of an approval order issued, who undertakes new development wi o + + is sued or who fails to comply with a stop vwor c order ssue i o er tr deemed to be in vioration of this ordinance and subject to a civi peraltyo s to comp'y with the requirements of th s Ordinance, who f ais to corform to t A. Amount of Penaty. o The penaty shay no: be site per day. 11--E;ac`i day of continued vioatio. violation. B o iding and abets in the vio fibs civil pena e lout first obtaining County ese regLmatior s sfra __ be ess than $ 5OoOO or exceed $ 00o00 for each or repeated violation snali constitute a separate betting° Any person who, through an act of commission or omission, aids or _aio 1 st-labe considered to nave committed a vioation for the purposes of C o Notice of Penalty. 4 civil penalty shall be imposed by a notice in writing, ei tll er by certified rnai: with return receipt requested or by personal service, to the person incurring the same frog � the County. The notice s'iay describe `she violation, approximate the date(s) of violation, and snap order the acts constituring the violation to cease and desis �, and, in appropriate cases, require necessary corrective actioi= within a specified time. 1D o Application for Remission Or Mitigation. Any person incurring a penalty may apply in writing within 10 business days of receipt of the penalty to the County Pubic Works lirector for remission or mitigation of such penalty. Upon receipt of the application, the County Pi line Works Director may remit or mitigate the penalty only upon a demonstration of extraordinary circumstances, such as the presence of information or factors not considered in setting the original penalty. The decision may be appealed to the Board of County Commissioners within 10 business days of the decision. E. Appeal of Civil Penalty. Persons incurring a penalty imposed by the Director may appeal in writing within 10 business days of the receipt of the penalty to the Board of Mason County Commissioners. The Commissioner's decision may be appealed to the Mason County Superior Court within 10 business days of the decision. 9 3; Penalates due Pena yties imposed under this Section shad become due and payabe 30 days after receiving it uness app ication for remission Or mitigation is made or an appeal is filed. Whenever an application for remission or mitigation is made, penalties shad become due and payable 30 days after the receipt of the decision regarding the remission Or mitigation° Whenever an appeal of a penalty is fi ed, the pena..ty shall become due and payable after aE review proceedings and a final decision has been issued confirming all or part of the penalty. lif the amount of a penaty owed the County is not paid within the time speci red, tree County shah take actions necessary to recover such penalty. MASON COUN TY STORMWATER MANAGEMENT ORDINAT CE 9.3.2 Fenlty Tree vered Penalties recovered shabe paid to a fund estab_ished by the Board of Mason County Commissioners, dedicated to enforcement, education , arcd/or enhancement of the stormwater management program. SECS O. 4- 1[ \ i 0o EXCEPT' Right of appea ONS actions of the Director sabe finat and conc_asive, un_ess within lO business days of the date of the Direcyor°s action, the original applicant or an adverse party gives written notice of appea_ to the Board of Mason County Commissioners for :review of the actions. ©2 IF nd1Ilngs of fact 11-4,xceptions to Minimum Rec u irements may be granted prior to permit approva L and construction. An exceptio_r may be granted fo_Jawing a Dublic hearing, provided that a written finding of fact is prepared, that addresses the ®lowing A. he exception provides equivalent environmenta protection and is in the overriding public interest; and that the objectives of safety, function, environnentaprotection and aci_i ty maintenance, based upon sound engineering, are fully met; E o `hat there are special physical circumstances or conditions affecting the pro ierty such fiat t_le strict application of these provisions would deprive the applicant of all reasonable use of the parcel of land in question, and every effort to find creative ways to meet the intent of the minimum standards has been made; C o What the granting of the exception will not be detrimental to the public health and we nor injurious to other properties in the vicinity and/or downstream, and to the qua=i yy waters of the state; and fare, of D o _he exception is the least possible exception that could be granted to comply with the intent of the Minimum Requirements. 003 IPHHOS g. opirovat Any exception sha' I be approved prior to permit approva 10.4 ID iAration of exceptllon Exceptions granted si�a be vat id fo 2 years, un and construction° ess granted for a shorter period MASON COUNTY STORMWA 11JR MANAGEMENT ORDINANCE O5 ®aid of ap ©a.. Ls Ayer a pub c_I caring, the Board of Mason County Comrrnissionemay grant an exception from the requirements of this 0r©inarce0 In granting any exception, the oard of Mason County Commissioners may prescribe conaions that are deemed ,necessary or desirable for the pub 0 interest. SECT SEVERAB ll IL is If any provision oft is Ordinance or its appl ca ion to any person, entity, or circumstance is Fele invalid, 2:he remainder of this 1 rcdina:ice or the app1 hca none oft e provision to other persons, enti ides, or cirournstances shall not be a ``fectedo A*O PT ATTE T� day. of ND1/41-timb-cai 2036�a (2:1 ;&(2q 77AeW1 BCC` �D OVA CO JM-l( COMMISSIONFRS MASON OU N FY, WASHIN9T.,ON Rebecca S. Rogers, Clerk of the Boa APPROVED AS TO FORM: Monty Cobb, Prosecutor 20 -d lie( it 4 t A RING ERICIKS011, Chair JAYNI. V TL e L1/2ktned atnti,.) 11 I "61ey\ r = 0 MIN, Commissioner TIM SHELDo N, Commissioner Ic\swr:--41L Lat-42t-