COMPLIANCE INFO_2007-2015 - Laserfiche WebLink

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mod on site to all sump sensors. The manufacturer recommends the sensors be mounted in a true vertical position and would take a nominal height of 1" liquid to trip off the sensor (see attached copy from Veeder-Root). From engineering standpoint by tilting the sensor the outside case edge would raise the sensing point higher on top of the 1" minimum nominal height thus would make it harder to detect liquid (see hand drawn diag). I believe the Inspector had jeopardized the integrity of the liquid detectability of the monitoring system. What has changed in installation requirement since the last 7 years that now made the position in violation? Also from engineering stand point, there is very tiny gain (almost zero) in height difference in relation to side way movement of few inches on top of the big UST tank. 403. The original vent sump cover is a bad design since the get go. The cover, made out of thin sheet metal, seats flat on top of the vent box. It tends to collect water and water gets leaked into the sump every raining season. To make things worse over time the sump nuts get damaged and/or loosed no longer allow the bolts to tighten. The original cover is also a bit too thin so over time it gets warped. I removed the original cover and I had a local shop made a new cover in the shape of the roof slanted downward to allow the rainwater to run-off. This whole rain season not a drop of water could intrude in. Due to the requirement from the Inspector I had the shop made a cover same size as the original but much thicker. I secured it down with original bolts but I still cover it with the slanted cover for extra protection from water intrusion. 404. Liquid water is normally condensed whenever there is a temperature change. The condensation even happens in car gas tanks. This is also true for any UST sumps. Water condensation is not water intrusion. The top lids are sealed and further protected by top rubber mats. Sensors cannot detect and alarm liquid when the height is less than 1". If there were alarms the station would have responded properly.