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To get them certified: send them to www.sbravo.com/cert SB - 989 vs : AB-2' 81 04: Do I have to "Lake Test'(water test) a DoubleWall Sump? A: No, you do not. And you will void a Bravo Systems warranty if you do, in any U.S. State. Let's educate ourselves. Download LG Letter 162-1 and browse to Page 6, to the latter of Part II: Section A. The paragraph reads: <quote> Pursuant to Section 2637(a)(6) of Title 23, CCR, portions of the UST system Mich are continuously monitored using vacuum, pressure, or interstitial liquid level measurement methods are exempt from periodic secondary containment testing. Therefore, periodic secondary containment testing is not required for secondary containment of tank and piping that are continuously monitored using vacuum,pressure, or interstitial liquid level measurement methods. Please note that annual certification of the leak detection equipment is still required. <end quote> Assembly Bill 2481 is specific to the State of California. These high standards far exceed the level of containment provided by the SB-989 standards. 2481 is a superior method of leak detection and prevention. Since AB-2481 is superior, why would it need to be supported by an inferior test procedure? As far as testing is concerned, testing per SB-989 is only valid for SingleWall sumps. It is not a practical test method for DoubleWall sumps. Why? If the sump interstice is dry, how are you going to see a leak on the outer wall if you are filling the interior with water?Both walls would have to have a major breach. The level of damage needed to allow water to leak through both walls(including time to fill up the interstice)would be obvious. If there was only a breach in the outer wall, how would you tell with a lake test if the water was being contained by the inner wall?Also, if there was a breach in the inner wall, but the outer wall was fine, how would you tell if water entered the interstice?Visually perhaps with Bravo Systems DoubleWall sumps, but how long would it take to accumulate enough liquid to see?This method is a great waste of valuable time. We accomplish more with these procedures: 1) Sump ships from factory sealed under a continuous Vacuum test of 20"+ Hg. 2)Any breach in the wall, after sealed (Eg. penetration fittings, lamination) is pressure/soap tested at 4 psi. 3)A 4 psi air integrity test is conducted after all laminations/fittings have been installed (prior to any hydrostatic filling)for one hour to allow the pressurized interstice to acclimate, then level is recorded, and tested for another hour before recording result. 4)We also recommend that when DoubleWall sumps are left overnight, that they have a factory-level vacuum (20"+ Hg)applied to the interstice, so that they can be inspected the next day. 5) If the sump is to be hydrostatically monitored, it is Hydro-Vac Filled. This is a Bravo- Exclusive installation procedure that pulls a 20"+ Hg vacuum on the interstice, then allows the interstitial fluid to flow in from a multi-gallon source through a ball valve. That isn't a test! You're right. The Advanced Leak Detection Procedure(ALDP) depends on the sump being filled with our interstitial fluid first. The ALDP test pulls a high vacuum on the interstice after it has been filled with liquid. With no acclimation necessary, the inspection can be done right after the Hydro-Vac filling process. Any leaks in the DoubleWall sump will show up as trails of bubbles coming directly from the leak point(s), which can then be located and repaired without wasting time guessing. Bravo Systems has been producing DoubleWall Containment sumps since August 2003 and has continued to be the Leader in reliable Secondary Containment equipment. Realizing that the last point of failure were the http://www.sbravo.con-Vfaq.htm