TM 10-6640-239-13 2-39 Section III.  OPERATION UNDER USUAL CONDITIONS Alphabetical Index Paragraph Title Paragraph Assembly and Preparation for Use.................................................................................................................... 2-6 Operating Procedures........................................................................................................................................ 2-7 Preparation for Movement ................................................................................................................................ 2-8 Shelter and Site Requirements .......................................................................................................................... 2-5 2-5. SITE AND SHELTER REQUIREMENTS. a. Site Selection.  Select a site that provides or has the following features: Ample space for maneuvering vehicles that may be used to move trailer-mounted generator set and the Modular Base Petroleum Laboratory (MBPL). Firm, reasonably level; well drained terrain. At least 500 feet away from other areas of operation, and is not uphill or upstream from other facilities which might be in path of escaping fuel or vapor. Not adjacent to low areas where dangerous vapors might collect. Near a stream, a pond, or an established water facility.  This provides an outside water source for the MBPL water system, and aids in control of potential fires. Easy access to roads.  At least one road should run in the vicinity of the MBPL 2-6. ASSEMBLY AND PREPARATION FOR USE. a. Inspection.  Inspect exterior of Mod Lab B to make sure everything is in good condition.  Check semi-trailer body, doors, rear axle assembly and front landing gear to see that they are secure, clean, and correctly lubricated.  Inspect vents, water inlet, purge doors and power input panel for damage.  If damage is found, notify supervisor.  See Appendix A for authorized repair TMs of mobile semi-trailer mounted petroleum laboratory. CAUTION If  Mod  Lab  B  is  not  level  some  test  equipment  may  be  adversely  affected  causing improper functioning or incorrect readings. b. Leveling.  Level Mod Lab B by use of independently crank operated landing gear legs on front and independently screw operated jacks at rear.  Check level with level at front, middle, and rear of MBPL. c. Setting Up Petroleum Modular Base Laboratory. When setting up Mod Lab A (1, Figure 2-12) and Supplemental Petroleum Lab (Mod Lab B (2)), as part of the Petroleum Modular Base Laboratory, the two trailers are positioned back to back with the bridge (3) connecting them.  Mod Lab B rear platform should be positioned 28” ± 0.75” from Mod Lab A rear platform and both platforms should be at the same height.  The centerline of both Mod Labs should be no more than 4” off center.  When Mod Lab B is properly positioned level Mod Lab B by use of independently crank operated landing gear legs on front and independently screw operated jacks at rear.  Check level with level at front, middle, and rear of MBPL.