| SUBSURFACE INFILTRATION BASIN GREEN INFRASTRUCTURE REQUIREMENTS | |||||||
| GI | Tributary Drainage Area (Max 2.5 Ac) | Basin Bottom Elev. (ft) | SHWT Elev. (ft) | Separation from SHWT (Min. 2 ft) | Tested Permeability (Min. 1 in/hr) | Basin Storage Vol. (af) (Min. WQS) | Test Pits |
|---|---|---|---|---|---|---|---|
| 1 | 1.689 | 87.0 | 81.35 | 5.65 | 20 | 0.173 | 13 & 14 |
| Lot 1 | 0.042 | 91.0 | 88.0 | 3.0 | 4.9 | 0.014 | 3 & 18 |
| Lot 2 | 0.042 | 93.0 | 90.0 | 3.0 | 15.7 | 0.009 | 19 & 20 |
| Lot 3 | 0.042 | 93.0 | 88.5 | 4.5 | 8.1 | 0.012 | 20 & 24 |
| Lot 4 | 0.042 | 93.0 | 88.5 | 4.5 | 8.1 | 0.012 | 21 & 24 |
| Lot 6 | 0.042 | 93.0 | 85.57 | 7.43 | 16.9 | 0.009 | 8 & 9 |
| Lot 7 | 0.042 | 94.0 | 89.37 | 4.63 | 20.0 | 0.009 | 10 & 5 |
| Lot 8 | 0.042 | 94.0 | 89.37 | 4.63 | 20.0 | 0.009 | 10 & 11 |
| Lot 9 | 0.042 | 93.0 | 83.84 | 9.16 | 16.0 | 0.009 | 2 & 16 |
| Lot 10 | 0.042 | 92.0 | 85.51 | 6.49 | 20.0 | 0.009 | 16 & 17 |
UNDERDRAINED BIORETENTION BASIN GREEN INFRASTRUCTURE REQUIREMENTS
| GI | Total Tributary Drainage Area (Max 2.5 Ac) | Basin Bottom Elev. (ft) | Lowest Outlet Elev. (ft) | WQS Elev. (ft) | SHWT Elev. (ft) | Separation from SHWT (min. 3.75') | Test Pits |
|---|---|---|---|---|---|---|---|
| 1A | 1.62 | 90.0 | 91.00 | 91.00 | 85.51 | 4.49 | 17 & 13A |
| 2A | 0.43 | 94.30 | 94.80 | 94.30 | 86.79 | 7.51 | 21 & 22 |
| 3A | 0.68 | 93.30 | 92.30 | 91.8 | 85.57 | 7.73 | 8 & 9 |
UNDERDRAINED POROUS PAVEMENT GREEN INFRASTRUCTURE REQUIREMENTS
| GI | Porous Pvmt Area (SF) | Tributary Drainage Area (ac) | Ratio (Max 3:1) | Stone Bed Bottom Elev. (ft) | Pavmt. Min. Top Elevation | SHWT Elev. (ft) | Separation from SHWT (Min. 1.25 ft) | Stone Bed Vol (Min. WQS vol.) (ft3) | Test Pits |
|---|---|---|---|---|---|---|---|---|---|
| 2B | 3,075 | 0.19 | 2.69:1 | 93.80 | 94.80 | 87.28 | 7.52 | 1,538.00 | 23 & 6A |
| 3B | 2,963 | 0.20 | 2.94:1 | 93.80 | 94.80 | 87.28 | 7.52 | 1,482.00 | 23 & 9 |
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