PVC drainage connection approval memo, Apr 1985

NYC 9/11 Public Portal Document , I , ; , , . ft C ■ ' • •

2. Masi FICr-OftF TftiiLftftft^__ Density • ASTM (Proctor) Height of cover (feet) Bedding AASHTO Classification T-99 3 5 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 Gravel Class I 95% ClassH 90% □ Maximum 7.5% deflection

80% 0 This zone not recommended

Sand Class III 90% 85% .■‘ft ft 75% LiftftZ: ftft IL ’r."

65% ft? - 'ftft ft Lift ftL: ■ft ft v- ft Clay Class IV 85% w/i

75% S' ift^.7' ' r. ftft oi a 65% IB i ..■ftftcft" ftft Peat Class V This soil class not recommended.

Figure 3JMaximum long-term defSections of F/Ay 46 psi (Series 46) PVC pipe (TIA percent) Density ASTM (Proctor) Height of cover (feet) Bedding AASHTO Classification T-99 3 5 8 10 12 14 16 18 20 22 24 26 28 30 32 34|36 Gravel Class I aa I - ■' • - ■ "in Class II .90% 0 Maximum 7-5% deflection ft- D This zone not recommended T - 80% ft'

Sand Class III 90% .ft 85% 75% ■ IS 65% SIS S' ft RS • i ■ft - ..ri: J Clay Class IV 85% 7,; ■ • 75% aw w i

65% ft •’■JI Litt' Peat Class V This soil class not recommended.

Note: Deflection values shown do not 2. External loading based upon soil deflections are compared with those -' include effect of live load or longitudinal ; weight of 120 lbs per cubic foot. in the table. bending. 3. Deflections predicted are based upon 4. Bedding classifications are as 1. No length of pipe installed under. pipe which was initially circular prior indicated on page 9 and correspond - conditions specified will deflect more to installation. Actual deflections may to ASTMD2321. than is indicated: the pipe will deflect differ because of initial out-of­ 5. Deflections listed in table are maximum less than the amount indicated if roundness caused by storage and/or long-term values. The recommended specified density is obtained. handling. These variations should be maximum long-term value is 7.5 percent. taken into account when measured I I 'A- ,W .i-' 777.7 if I :h -A ’’th-

ft ft7ft"t-V ’'M ’ft' L'

,7 •ftfto. ft /ft* ' I '.' 7ft..' ftft . i- ',ry- 7 . -■'ft'-f '/ ft/' ;< ■'"’’—ff

NYC-WTC_000165047