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George Takernori Teichert& Son, Inc, December 16, 1999 Page 2 Installation of a solenoid valve with an adjustable delay would result in the following scenario. Driver hooks up bottom loader and turns pump on. Pump# 1 turns on, leak detector goes through `Reset', `Leak Search' and `Full Flow, all within 7 to 15 seconds, depending upon what original line pressure was. After 15 seconds, the solenoid opens and pump#2 comes on. Satisfactory flow should result. This solenoid valve should be installed above ground and after the two lines are teed together. Keep in mind that added problems can be created by thermal contraction, especially in loading racks where steel pipe is being used. Thermal contraction causes vapor pockets to form in the line that have to be re-pressurized. This takes extra time for the leak detector to step through. Additionally, extra swing check valves could cause a problem. Keep in mind that the pump has it's own check valve with a pressure relief that is probably set at 20 psi. Our leak detector has a check valve with a 41 psi pressure relief. You said that the first swing check valve on each Brae had a relief of 50 psi and another check valve above ground had a relief of 35 psi. Although no relief valve spring is accurate enough to predict what it will hold, you have the potential of holding 146 psi in the line. This could create problems in the summer when thermal expansion will occur. I suspect these check valves may cause problems for our leak detectors also, but I will have to consult with our engineer to discuss that. I believe he will recommend that these check valves be removed from the system and will get back to you on that. With the current piping configurations, I feel that this application is not appropriate or compatible with the WG LD-3000 series of leak detectors. If you have further question or comments, I invite you to call the at your convenience. Sincerely, Steve Wilson National Sales Manager