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10 PIPING AND VENTING isting tanks to less than one-quarter capacity, remove All piping to the primary tank must be connected to fit- the surface pad. Enlarge the excavation for the new tings in the manway cover. All internal piping, such as tank, leaving as much backfill as possible around exist- fill tubes and submerged pumps,must be at least 4 inches ing tanks. It may be necessary to install shoring to make (10 cm) from the bottom of the tank.The distance from sure that existing tanks do not move and that sufficient the bottom of the tank to the top of the cover is given in backfill remains. The new tanks must be installed by the table below. BOTH PRIMARY (INTERNAL) AND following the proce- dures in this guide. SECONDARY (EXTERNAL) TANKS MUST BE INDI- VIDUALLY VENTED TO ATMOSPHERIC PRESSURE. Remember to leave minimum of 24 inches Distance (60 cm) between 111 From Bottom of Tank tanks. The backfill " Nominal To Top of Fittings on Tank size Double Wall Manway Cover material must be the 4 it 550.1000 gal 56%in 143.8 cm same as that specs- _ —►f ;�-3 6 it 2000-6000 gal 80'/4 in 203.8 cm Pied in Item 3. 81t 6000-12,000 gal 1001h in 255.3 cm 1oft 10,000-20,000 gal 128%in 326.7 cm _p NOTE:Minimum clearance between bottom of tank and internal pip- i-� i p ing is 4 inches. 11 FILLING THE TANK 13 MONITORING The tank may be filled with water or product after the Xerxes' double wall tank has an air space for the con- backfill is even with the top of the tank. Only under wet tainment of leaked product from the primary tank. The hole conditions as described in Item 8, should water or tank,as supplied,will have a minimum of one fitting that product be added before the backfill is even with the top provides access into the gap between the primary (in- of the tank. Also, when filling the tank with water or ternal)and secondary(external)tank shell walls. If only product, make sure the tank is adequately vented. one access fitting is provided the tank must be sloped CAUTION:The ballast level in the tank must not ex- so that the lowest elevation is the monitoring end. ceed the water level in the hole during the ballast The monitoring system and method is the responsibility 1, procedure when sinking tank in a wet hole. Never of the tank owner and/or operator. A safe electric or fill the secondary(external)tank with fluid. mechanical dip system should be employed to detect either incoming water or product. The monitor system r 12 ADDING TANKS AT EXISTING SITES employed must allow the space between the primary Additional Xerxes Century-Cast FRP Tanks can be in- and secondary tanks to remain vented to atmosphere. The monitor system should detect leakage near the bot- stalled at existing locations if proper foundation support exists.The method of installation is the responsibility of tom of the tank. Monitoring can be done through the the owner. It is required,however that one of the follow- stallaaccess fitting provided. If the tank t sloped during ng end. ing methods be used.The preferred method is to install tion the lowest elevation must be the monitoring a new tank in a separate hole at least 3 feet (1 meter) end. from the original hole. Caution must be exercised in CAUTION: DO NOT FILL THE SECONDARY CON- keeping unusual surface loads off existing tanks. The TAINMENT TANK WITH A FLUID OR OTHER MATE- natural barrier of undisturbed soil between tanks must RIAL. FAILURE TO COMPLY WILL VOID ALL be maintained. WARRANTIES. If this method is not practical, additional tanks may be buried in the same installation hole. After emptying ex- PERFORMANCE WARRANTY Xerxes Corporation warrants that our underground storage tanks, if used in accordance with our specifications and installed according to our published installation instructions: (1) Will not fail for a period of thirty(30)years from date of original purchase due to external corrosion. (2) Will not fail for a period of thirty(30)years from date of original purchase due to internal corrosion, provided the tank is used solely with or without tank water bottoms for gasoline, gasohol (90% gasoline/10% ethanol mixture), 90.5% gasoline and 9.5% Oxinol-50'(4.75%methanol and 4.75%GTBA mixture),jet fuel,av-gas,kerosene,diesel fuel,motor oil,or potable water at ambient underground temperatures;or used for fuel of at temperatures not to exceed 150°F. (3) Will not fail for a period of thirty (30) years from date of original purchase due to structural failure (defined as breaking or collapse) provided the installation is performed and validated by a qualified installation contractor and the tank is used as stated above. (4) Will meet our published specifications and will be free from material defects in materials and workmanship for a period of one (1)year following date of original delivery by us. Xerxes Corporation's liability under this warranty shall be limited to, at our option, (a) repair of the defective tank, (b)delivery of a replacement tank to the Point of original delivery,or(c)refund of the original purchase price,and we shall not be liable for any labor, other installation costs, Indirect or consequential damages or other damages in connection with such tanks. THE FOREGOING CONSTITUTES OUR EXCLUSIVE OBLIGATION AND WE MAKE NO EXPRESS OR IMPLIED WARRANTIES, OR ANY WAR- RANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE WHATSOEVER, EXCEPT AS STATED ABOVE. *TM.ARCO Chemical Co. Effective 7/15/85