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Newark Sierra Paperboard Corp. THE 800 West Church Street Vi A Newark Group,Inc.Company GROUP Stockton,CA 95203 Products from Recycled Fibers 209466-5251 Fax 209,942-1214 Underground Storage Tank Monitoring Required leak detection = 0.2 gph = 4 . 8 gpd = 0 . 1143 bbl pd 1. Truck scales are certified to [+/- 0 . 1% of 100,000 lb] this corresponds to +/- 100 lb = +/- 0 . 29 bbl per truck load of oil, with 4 truck loads per day, maximum error = ±L 1 . 16 bbl 2. Tank level gauging probe is accurate to +/- 0.001 inch, for our fuel oil reservoir that is = +/- 0.057 bbl, however due to the high viscosity of the oil, stiction along the guide tube would probably only allow +/- 0.01 inch accuracy, which corresponds to a maximum error = +/- 0.57 bbl 3 . Taylor Integral wedge fuel oil meters (best available at time of purchase) have an accuracy of +/- 0.5% and a repeatability of +/-0. 2%. Assuming there were some way to field calibrate to take advantage of the better repeatability values, the maximum error = +/- 1. 20 bbl 4 . The above fuel oil metering would be the measure of fuel oil going into and out of the courtyard fuel oil tanks. I do not yet have a value for the accuracy of tank level gauging in the courtyard tanks. Additional variables that affect the accuracy of leak detection include: thermal gradients within the fuel oil reservoir, and the fact that the fuel oil reservoir does not sit perfectly level, it tilts slightly downward toward the east. Note The fuel oil reservoir has a capacity . of 220,000 gallons. The equipment listed by the vendors that provide underground storage tank leak detection is intended for tanks only up to 15,000 gallons. No claims for sufficient accuracy to meet the requirements are made for tanks much larger than 15,000 gallons, let alone a tank of 220,000 gallons.