TM 10-4320-303-13 Table 2-7.  Operator Preventive Maintenance Checks and Services for TWDS.  (Continued) Location Item No. Interval Item to Check/Service Procedure Not Fully Mission Capable if: BOOST PUMPING STATION-CONT 12 Before Hose Assemblies Inspect for damage, leaks, Class III three and loose connections. leaks. Tighten loose connections. If hose is damaged or Class III leaks are present, notify supervisor. 13 Before Check Valve Ensure check valve is Check valve is installed properly.  Arrow on not installed body casing must point in properly. direction of water flow. Connection is Inspect for leakage and loose loose.  Class connections.  Tighten loose III leaks. connections. 14 Before Pressure Relief Inspect valve for presence of Dirty pressure Valve grit, sand, or dirt.  If relief valve. dirty, clean using soft Pressure relief brush.  Inspect for damage or valve damaged. leaks. Class III leak. If discharge port is obstructed. STORAGE ASSEMBLY 15 Before 4 Inch Gate Valve Inspect for damage and 4 inch gate improper operation.  Check to valve is damaged be sure valve turns freely. or does not turn Check for leaks. freely.  Class III leak. 16 Before 4 Inch x 10 Foot Inspect for damage, leaks, Hose is damaged. Discharge Hose and loose connections. Class III leak. Tighten loose connections. Connection is loose. 2-19