Chamber Model = ADS N-12 24" (ADS N-12® Pipe) Inside= 23.8"W x 23.8"H => 3.10 sf x 20.00"L = 62.0 cf Outside= 28.0"W x 28.0"H => 3.92 sf x 20.00"L = 78.4 cf 28.0" Wide + 13.4" Spacing = 41.4" C-C Row Spacing 3 Chambers/Row x 20.00' Long +2.33' Header x 2 = 64.67' Row Length +10.0" End Stone x 2 = 66.33' Base Length 16 Rows x 28.0" Wide + 13.4" Spacing x 15 + 10.0" Side Stone x 2 = 55.75' Base Width 4.0" Stone Base + 28.0" Chamber Height + 4.0" Stone Cover = 3.00' Field Height 48 Chambers x 62.0 cf + 54.08' Header x 3.10 sf x 2 = 3,311.3 cf Chamber Storage 48 Chambers x 78.4 cf + 54.08' Header x 3.92 sf x 2 = 4,186.8 cf Displacement 11,094.6 cf Field - 4,186.8 cf Chambers = 6,907.8 cf Stone x 40.0% Voids = 2,763.1 cf Stone Storage Chamber Storage + Stone Storage = 6,074.4 cf = 0.139 af Overall Storage Efficiency = 54.8% Overall System Size = 66.33' x 55.75' x 3.00'

48 Chambers 410.9 cy Field 255.8 cy Stone