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conditions. Site conditions and BMP sizes will vary which may affect the maintenance <br /> costs. <br /> Table 3 <br /> Required Equipment and Staff Time to <br /> Conduct Maintenance of BMP Facilities <br /> Equipment <br /> Estimated. <br /> i° Staff <br /> U U o 0 Annual <br /> 18 .4 2Time Cost <br /> ($/yr) <br /> 3 a� Ea i <br /> BMP 3 3 Q x0 <br /> �" > <br /> Swales QQ-Q Q0= 20 $1,700 <br /> Filter Strips 11211112111111111211 •/ 11121111111•1 19 $1,500 <br /> Wet Ponds ✓ ✓ ✓ ✓ 0�� 37 I I <br /> Dry ED Ponds 11211112111111111121111/1112111121111111 43 MAME <br /> 37 <br /> Wet ED Ponds 121111211111111201121.1120111211M1MEMO <br /> Constructed Stormwater Marsh/Wetland ✓ ✓ 1121.2111111 42 <br /> i <br /> 00Tf�� <br /> Dry Wells/Infiltration Vaults 20 $1,300 <br /> Infiltration Trench EIMINIMMINEMIZIENIMIIII <br /> 22 $1,400 <br /> Infiltration/Retention Basin Q 43 $3,500' <br /> tuc ,to` See, <br /> Structural Storm Sewer Devices MIME_ I ✓ I ✓ I 12 $1,300 <br /> Cost estimate is based on maintenance of a vegetated filter approximately 500 feet in length and four feet <br /> wide. <br /> 2 Cost estimate is based on maintenance of a 5 acre-foot pond. <br /> 3 Cost estimate is based on maintenance of a 5 acre constructed stormwater marsh/wetland. <br /> 4 Cost estimate is based on maintenance of a single device. <br /> S Cost estimate is based on maintenance of a 500-foot long infiltration trench. <br /> 6 Cost estimate is based on maintenance of a 5 acre-foot infiltration basin. <br /> I <br /> I <br /> I:\945042ne\task0400\memo8\Stormwater Policy Team Meeting.doc <br /> 5 <br />