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Trench Sizing Piping trenches should be dug in such a manner that the trench width is equal to at least twice the width of all the flexible pipes contained within. All Piping should be positioned in the trench so they are a minimum of 2- (50mm) apart. Trench turns should be sweeping rather than sharp angles. The bottom of the trench should be as uniform as Possible to eliminate high spots to insure an even layer of bedding material under the pipe. Remove all sharp rocks and debris from the trench bottom before bedding material Is installed. Bedding'& Backfill Materials Approved bedding and backfill materials for the GeoFtex Piping System shall meet the following specifications: Sweeping Tums Pea Gravel Crushed Stone Sand Rounded pea gravel is permitted with a minimum Crushed stone is permitted providing It shall be River or other approved sand. Is permitted diameter of 1/8" and a maximum diameter of 3/4". washed clean and be of the free flowing type with providing it shall be washed clean and is free an angular stone size between 1/8' and 1/0. flowing. When backfllling make sure sand Is (Meets ASTM C-33 paragraph 9.1 requirements.) evenly distributed and Packed around the piping. NOTE: A minimum of 6" (15Omm) of approved bedding material shall be spread evenly along the bottom of the trench. All bedding and backfill materials should be dry and free from Ice, snow and debris. Using material other than those described above without written approval from Environ Products Inc will void the product warranty. GeoFtex Sloping If a continuous slope or 'fall" is required from the last dispenser on a piping run to the lank then the tanks should be buried at a sufficient depth and the pipe entry height into the dispenser sump should be of sufficient elevation so that 1/8" of fall per lineal foot is maintained. Check your local code regulations for fall requirements other than that which is previously stated.. Pressure Piping Systems (No Interstitial Monitoring) For Pressure Piping Systems which are routed in series and do not use the Liquid. Interstitial Monitoring System then it is is recommended that center sloping between containment sumps be used. This application requires a high point between containment sumps, allowing any leaking product to flow to either containment sump. Deep Dispenser Sumps are required for this type of application. Overburden Unpaved Surface If the surface is unpaved, then a minimum of 12' (300mm) of approved backfill material should be installed between the top of the GeoFtex Piping and the top of the ground. surface. Pressure Piping Systems (With Interstitial Monitoring) For Pressure Piping Systems which are routed in series and the Liquid Interstitial Monitoring System is used., sloping of the piping Is unnecessary Providing that the elevation of the liquid level monitor is higher than the highest elevation of the piping. The monitor will still be able to detect a leak in the GeoFtex Piping even If there are high and low elevations in the piping. Shallow Dispenser Sumps are recommended for use in this application. Suction Piping Systems Sloping the Geo Flex Piping from the dispenser back to the tank is always required for Suction Piping Systems where maintaining prime is necessary. Shallow Dispenser Sumps are recommended for use In this application. Asphalt Surface It the surface is a minimum of 2' (50mm) of asphalt, a minimum of 6" (150mm) of approved backfill material should separate the top of the G -Flex Piping from the bottom of the asphalt. Concrete Surface If the surface is a minimum of 4" (100mm) of reinforced concrete, a minimum of C (100mm) of approved backfill material should separate the top of the G -Flex Pipe and the bottom of the concrete. Backfilling Backfilling of the GeoFlex Piping System should occur only after the final integrity testing has been performed. Prior to backfilling completely, hand shovel the backfill material between and to the outside of the pipe to maintain the 2" (50mm) minimum required spacing between the pipes and walls of the trench. Final backfilling shall be done slowly and evenly so as not to disturb the spacing of the piping.