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00 f <br />FIELD ASSESSMENT <br />A. General Description of the Tank System — The tank system includes a 5'-3" +/ <br />diameter, 18'-6" +/- long horizontal welded double wall steel tank set in saddles. New <br />oil is kept in the east inner tank 5 -feet in diameter by 9 -feet +/- long and pumped via <br />small diameter, low pressure hoses into the shop for use. Used oil removed from the <br />truck engine is pumped into the west inner tank approximately 5 -feet +/- in diameter by <br />9 -feet +/- long using small diameter, low pressure hoses. The Owner processes <br />approximately 2,000 gallons oil per month (see the photographs in Appendix `A'). The <br />tank system includes the following. <br />1. Tank East End — A 2 -inch nominal standard pipe riser with gauge for the double <br />tank space demonstrated there is no leakage from the inner tanks nor excess <br />condensation. The removal of the gauge allows the space to be pumped empty if <br />leakage did occur. <br />2. Tank West End — The west end has a grounding cable to the building. <br />3. Tank Shell <br />a. There are two 18 -inch diameter bolted access covers (one at each end of <br />each inner tank). <br />b. There are a number of vents and nominal standard pipe fittings, pipe caps <br />and pump equipment. <br />C. The flow is very slow and fluid level sensors indicate tank capacities. <br />B. Detailed Description <br />1. Tank Configuration — The tank was fabricated December 1999 as a secondary <br />containment vessel per UL142 and STIF921. The outer shell volume without the <br />inner tanks is approximately 3,000 +/- (two 1,500 gallon +/- internal tanks) for the <br />horizontal welded steel tank. There are two (2) structural steel saddles supported <br />by 3 to 4 -inches of A/C paving over 6 to 8 -inches of compacted aggregate base. <br />2. Design and Evaluation Standards — ASCE Standard 7-05, 2007 CBC and STIF921 <br />and API 650. <br />3. Material <br />a. ASTM A36 steel at tank shell and tank ends. <br />El 1-008 <br />b. E70XX partial grooved butt welds at least 1/4 -inch or larger. <br />C. ASTM A53 Grade B pipe or ASTM A501 at pipe systems <br />III <br />Field Observations <br />