Chamber Model = ADS N-12 15" (ADS N-12® Pipe) Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf 18.0" Wide + 10.9" Spacing = 28.9" C-C Row Spacing 3 Chambers/Row x 20.00' Long +1.50' Header x 2 = 63.00' Row Length +8.0" End Stone x 2 = 64.33' Base Length 3 Rows x 18.0" Wide + 10.9" Spacing x 2 + 8.0" Side Stone x 2 = 7.65' Base Width 4.0" Stone Base + 18.0" Chamber Height + 4.0" Stone Cover = 2.17' Field Height 9 Chambers x 24.0 cf + 6.31' Header x 1.20 sf x 2 = 231.2 cf Chamber Storage 9 Chambers x 31.9 cf + 6.31' Header x 1.60 sf x 2 = 307.5 cf Displacement 1,065.8 cf Field - 307.5 cf Chambers = 758.3 cf Stone x 40.0% Voids = 303.3 cf Stone Storage Chamber Storage + Stone Storage = 534.5 cf = 0.012 af Overall Storage Efficiency = 50.1% Overall System Size = 64.33' x 7.65' x 2.17' 9 Chambers 39.5 cy Field 28.1 cy Stone