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07114/2610 14:10 Containment Solutions (FAA)814S42S020 P.0021008 "' CONTAINMENT SOLUTIONS A DENALI COMPANY August 21,2009 .deference:Converting Owens-Corning& Containment Solutions dry annular space to Hydrostatic monitoring annular space. Value Customer: Containment Solution's Field Service can modify existing double wall fiberglass glass storage tanks that have dry annular space to a hydrostatic mnnitoring annular space. CSS Technician will install top mounted reservoirs on centerline of tank top for future hydrostatic tank monitoring. hydrostatic monitoring is a continuos monitoring system 24 hours a day 365 days a year. After the reservoirs are installed the annular space will be filled with liquid and proper level established in the reservoir for placement of the double float sensor. This modification was established by the manufacture and meets manufacture's specifications. Double wall tanks can not be monitored hydrostatically with out a tank mounted reservoir. Volume of liquid in the reservoir is required for fluctuation of brine level and maintaining level between high and low alarm levels.Also the tank mounted reservoirs are in control temperature range. Attached is the manufacture's specification I have included for your review. It states the number of lay-ups required to attach the reservoir to secondary tank. The technician will cut a 3"to 4" dia. hole in the secondary tank centered on the reservoir for the placement of the monitoring sensor and to allow the brine to enter reservoir for monitoring with the double float sensor. All materials are from the manufacturing plant in Bakersfield, CA. and are UL Approved materials. Air/soap test will be performed on the newly installed reservoir prior to filling the annular space with liquid, or may be tested by raising the liquid above the tank mounted reservoir in to the riser for a hydrostatic test.