Above ground and below grade storage and settling - installation and maintenance recommendations

Above ground and below grade storage and settling - installation and maintenance recommendations
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Device	Installation notes	Frequency of inspections	Maintenance checklist (link)	Permitted on private land/ Maintenance agreement recommended	Practices for minimizing sediment and trash buildup	Practices for minimizing erosion	Cost considerations (equipment needed and man hours)
Pretreatment row on underground storage/filtration	no data	At least every 6 months for first year of operation, then varies by location			Periodically remove sediment by back-flushing water and vacuuming manhole sump [1]		Vacuum truck
StormTech Isolator Row	Installation instructions available here.	At least every 6 months for first year of operation, then varies by location [2]	Step by step maintenance procedures		Clean-out when average depth of sediment exceeds 3 inches [3]		Vacuum/JetVac combination vehicle [4]
Settling chamber/vault					Remove sediment once depth reaches 6 inches or more [5]
Oil/water/grit separators		After every major storm but at least once per month [6]			Clean out at least twice per year [7]
Hydro Dry Screen		Every 3-6 months during first year, then site specific [8]	Maintenance and inspection checklist [9]		Remove sediment once depth exceeds maximum clean-out depth [10]		Vacuum truck
Suntree Nutrient Separating Baffle Box (NSBB)		After each runoff event initially, then at least quarterly. Local and State regulation may require every 90 days [11]	Inspection and maintenance checklist; [12]		Vacuum out sediment chambers when sediment accumulation exceeds 50% storage volume [13]		Vacuum truck
Manhole Baffle Box		Frequently for first two years following installation, then site specific [14]			Fully cleaned at least once per year [15]		Vacuum truck; One half day; Average cost $450 [16]
Environment 21 StormPro		At least quarterly until a more accurate schedule can be determined [17]	Maintenance data sheet		Sediment should be removed when sediment depth in first chamber is 50% of design sediment storage depth or at least once per year [18]		Truck-mounted sewer and catch basin cleaner with vacuum pump [19]
BaySeparator by BaySaver		At least every 6 months initially, then site specific [20]	Maintenance instructions		Cleaning recommended every 12-36 months or when 2 feet of sediment have accumulated [21]		Vacuum truck [22]
Sump Manhole with SAFL Baffle	45 minute installation [23]	Three times per year for first two years			Sediment removed before it reaches the bottom of the SAFL baffle		Vacuum truck [24]
Deep sump catch basin		Four times per year and at the end of foliage and snow- removal seasons [25]			Four times per year or when deposit depth is greater than ½ depth from bottom of invert to lowest pipe [26]	Hood required	Vacuum truck or clamshell bucket [27]
Forebay/pre-settling basin	Hard floor (concrete or grouted stone) allows definition of bottom and ease of maintenance. Provide appropriate stabilized maintenance access for heavier equipment at no more than 2% cross slope and no more than 10% longitudinal slope	Monthly [28]			Four times per year or when sediment depth is >3 ft. A hard bottom such as concrete facilitates removal, during design ensure forebay is vehicle accessible [29]; [30]	Forebay should be designed to withstand 2-yr and 10-yr velocities without scouring [31]	Vacuum truck skid-loader, or backhoe