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MONITORING FOR DOUBLE--WALL TANKS <br /> INSPECTIONS TO BE CONDUCTED BY DEALER <br /> 1. Daily reconciliation shall be made of the Inventory Control Records. <br /> 2. Daily visual inspection for leaks shall be made in the areas of: <br /> - submerged pump- <br /> - Tank fill (also inspected after each delivery) . <br /> 3. Dealer MUST be aware that a reduction in product flow to 3 gallons per minute (gpm) <br /> indicates a potential piping leak. <br /> SECONDARY CONTAINMENT MONITORING PROCEDURE <br /> Tank or Piping Secondary Containment (annular space or Piping Trench Laver) shall be <br /> monitored daily_ by the dealer, unless a less frequent period is allowed. This is done to <br /> determine if product is leaking from the primary container or if water is entering from an <br /> outside source. 'This procedure is not necesgM if an electronic monitoring system is <br /> installed to monitor these items. Contact your Unocal representative for monitoring port <br /> locations and refer to the diagrams on page 2. <br /> 1. Use a gauge stick (dipstick) to detect any liquid in the tank annular space, double- <br /> wall piping monitoring ports, or piping trench liner monitoring wells. Lower the <br /> stick slowly until it hits the bottom of the tank annular space. <br /> 2. Slowly pull the stick back out and observe whether the stick has been discolored by <br /> liquid. If product and/or water is detected, immediately contact your <br /> representative. <br /> 3. Write this number down, and repeat the same procedure. If the two numbers are not <br /> close, repeat the procedure until the numbers agree. <br /> 4. Enter the final number in the "Secondary Containment Recording Sheet" (attached) . <br /> NOTE: Piping trench monitoring wells consist of slotted PVC pipe which allows liquid <br /> intrusion and a manhole for access. Wells are located at the lowest point of the <br /> fiberglass trench liner. <br /> RECORDKEEPING FOR DOUBLE-WALL TANKS & PIPING <br /> 1. Keep track daily of the liquid level on the "Secondary Containment Recording Sheet". <br /> 2. If ANY fuel and/or water is discovered in the trench liner, call your representative <br /> ImMEDTATELY, and explain the situation. <br /> 3. If the representative has been notified, but after 8 hours it has not been possible to <br /> remove all the liquid from the secondary containment, dealer must contact the local <br /> agency shown on the cover sheet. <br /> ELECTRONIC MONITORING SYSTEMS <br /> If this station is equipped with an electronic monitoring system for underground tanks and <br /> piping, in the event of a leak in the primary containment, product will be contained in the <br /> annular space. The sensors for the electronic monitoring system are located at the low end <br /> of each tank, and at the low end of the piping where the product will drain back into the <br /> tank. There may be sensors at additional locations. Sensors will signal the presence of a <br /> leak. <br /> If a leak is discovered, the "Unauthorized Release Report" must be sent to UNOCAL within <br /> 24 hour's. The "Release Evaluation Checklist" must be attached to the "Quarterly Report." <br /> DIAGRAMS DOUBLE-WALL PIPING <br /> DOUBLE-WALL TANK PIPING TRENCH LINER <br /> "ONITOF,1h16 MONITO�IPI� �Q�® <br /> Po RT PaRT5 / <br /> —ANNULAR SPAr-I✓5 -MENUt LINER /" page 6 of 10 <br /> NOT TO SCA L5 <br />