in fig2 in one embodiment a recovery pipe 32 and recovery valve 34 are attached to the tee fitting 26 and the recovery pipe 32 extends downwardly into the chamber 10 the recovery valve 34 may be a ball valve that attaches to the bottom end of the tee fitting 26 however such suggestion is not intended to be limiting of the invention claimed herein the first end of the recovery pipe 36 attaches to the recovery valve 34 the second end of the recovery pipe 38 should have a minimum clearance of about one and a half inches from the lower surface of the chamber to allow unimpeded fluid flow into the recovery pipe 32 in another embodiment not shown the recovery pipe 32 may extend horizontally into the chamber 10 when fluid is drawn from the tank drain outlet pipe 18 the bull plug is removed 30 and a female camlock fitting is attached not shown then a conventional hose and male cam lock fitting may be secured prior to opening the drain valve 22 the same process is followed for extracting fluid from the draw off outlet pipe 20 when spilled fluid has accumulated in the chamber 10 it may be recovered by a vacuum truck by closing the draw valve 24 and opening the recovery valve 34 spilled fluid is then drawn out of the chamber 10 by the vacuum truck it should be understood that the chamber 10 may also have valves and outlets configured in a like manner to that described in applicant 39 s co owned u s.