CHAPTER II, SECTION 3 mation the working point coordinates were computed by the Contractor. Due to the function of each station, location was established within second order accuracy (1:10,000). In the case of Stations 1811, 1812, 1813 and 1819 (pipe- lines) the User required a line of sight through the pipes. In order to accomplish this, the elevations were corrected to compensate for the curvature of the earth. These values were computed and recorded to indicate the various points on these stations and to show the actual and corrected values for elevations. Criteria for vacuum pumping stations required a continuous flow of cooling water be maintained for the pumps in the event of power failure or when closing any water pump. To accomplish this, a pressure tank system for each vacuum pump wasdesigned, using a pump with a 127-foot head at zero delivery and putting an orifice in the tank discharge for restricting the flow to the required minimum amount of water with a pressure head of 35 feet. The total quantity of water flowing for five minutes was arbi- tarily chosen as approximately 100 gallons in order to size the storage tank. Stations 1812 and 1813 had noelectrical installations. Stations 1814, 1815, 1816 and 1819 each had one local phone on a common loop. Power was supplied to Station 1841 from Station 1310 through a 4-inch conduit with three #500 MCM conductors which were installed from the utility unit substation in Station 1310 and terminated in a powerpanel within Station 1841. Power for Station 1817.02 was supplied from a 112.5 KVA, 3-phase, 4,160120/208-volt transformer located near Station 24, through a 2-inch conduit with #4 conductors which terminated in power panel “PA” within the station. Power to Stations 1818.04 thru .07 was supplied by a 1%-inch conduit with four #4 conductors from a 45-KVA, 3-phase, 4,160-120/208-volt transformer located near the subject station and terminated in a 120/208volt, 3-phase, 4-wire, lighting panel “LA”. Power to Station 1818.01 was supplied from a transformer in Station 1524 through four #2 direct burial conductors. Stations 1818.05 and .06 were fed by 45-KVA, 3-phase, 4,160-120/208-volt transformers located between Stations 1818.03 and .09 through four #2 direct burial conductors which terminated in lighting panel “LA.” The electrical work for Station 1818.09 was the same as for Station 1818.06, except that the station was fed from a 15-KVA, 4160120/208-volt, 3-phase transformer which was installed 30 feet from the south wall of the statier. No timing signals were required. ‘The cubic yards of concrete poured for each station were as follows: Station 1811, 310 cubic yards; Station 1814, 39 cubic yards; Station 1815, 99 cubic yards; Station 1816, 166 cubic Page 2-106 yards; Stations 1818.01 thru .09, 1818.02 and 1841, 104 cubic yards and Station 1819, 4 cubic yards. Prior to shipping the pipe overseas, the interiors were grit-blasted and cleaned with acetone, then blown with hot air to ensure clean and rust-free pipe. The interiors of the pipe were fitted with a square paper tube impregnated with a rust inhibitor and the pipe ends were then capped and sealed. On arrival at the Jobsite the pipe was inspected and found to be clean and free of rust. However, while stored in the pipe yard awaiting installation, moisture collected inside the sealed pipe and rusting started. The pipes had to be again grit-blasted, cleaned with acetone, and blown with dry air, then recapped until they were required for reinstallation. A shortage of grit at the Jobsite required that 12 tons be airlifted in order that the work would not be delayed. STATION: PURPOSE: SITE: USER: PARTICIPATION: CONSTRUCTION: OCCUPANCY: 1830 Camera Station George DOD-18 11 and 13 12-12-55/5-5-56 3-12-56 Existing CASTLE Station 1550, a twostory heavily-reinforced concrete structure was rehabilitated and modified to provide for Station 1830. The lower floor contained generators, dehumidification equipment, telephones, timing cables and a signal system. The upper floor contained cameras which were sighted through three drop-type blast doors. The generator engine exhaust, dehumidifier intake, and outlets were closed by blast doors with a tensioned spring closing device. A new dehumidification unit was installed, corroded fuel lines were replaced, and a fuel tank was buried adjacent to the building. The drop-type blast doors operated satisfactomly after new gaskets were installed and the latches overhauled. The blast doors operated by tensioned springs after release by a built-in blast link proved to be unsatisfactory. Therefore, a frame constructed of a 60- pound rail was welded to the outside of the door frames in such a way that the doors could be released by blast links held in tension between the frame and the door. This method worked satisfactorily. Power requirements were 27 KW, 208-volt, 3-phase. Timing signals plus a zero test signal were provided. Construction started 12 Dec- ember 1955, beneficial occupancy was provided on 12 March 1956, and completion was effected on 5 May 1956. Final completion of the Station was delayed due to a shortage of plumbing and electrical fixtures.