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Ms. Brenna Christiano <br />January 22, 2008 <br />Page 2 of 3 <br />Description of any internal and external pumps: A pneumatic driven pump is used to fill the tank from oil <br />dispensed in the sump table. <br />Sketch or drawing of the tank, including the dimensions: The tank dimensions are illustrated on Figure 3. <br />Aize of the tank: The tank was delivered new to the site on March 24, 1988 according to the tank <br />manufacturer (ConVault, 800-222-7099). <br />Description and evaluation of leak detection equipment: The tank includes an integrated leak detection <br />tube that allows monitoring for leaks from the primary tank into the secondary containment. The leak <br />detection chamber is checked as part of routine monitoring and maintenance. <br />Description and evaluation of corrosion protection equipment: The tank is wrapped with 30 -mil high <br />density polyethylene to prevent external corrosion. Water that may accumulate in the tank is removed <br />with the oil when the tank contents are collected for recycling approximately every two weeks. This <br />process minimizes internal tank corrosion. <br />Description and evaluation of spill control or overfill equipment: The tank is filled using attached piping <br />from the sump table. The tank is fitted with a level gauge that is monitored visually to prevent <br />overfilling. The ConVault and sump tank are maintained within an area surrounded by a concrete curb <br />and covered by a roof structure. <br />Characteristics of the wastes handled: Waste oil from vehicles <br />Description of anv structural damaae or inadeauate installation or construction: None observed. <br />Results of leak test, internal inspection or other integrity testing: The inspection was limited to visual <br />observation. Leak testing and internal inspection was not performed. No signs of leakage were observed <br />at the time of the inspection. <br />Estimate of service life of the tank: Based on corrosion testing performed by the manufacturer the 1/8 <br />inch thick steel tank is estimated to have an approximate 40 year service life. The tank manufacturer <br />provides a 20 -year warranty for this tank. <br />Conclusions and Recommendations <br />The tank installation is acceptable for waste oil storage. e2 recommends monitoring and maintenance <br />continue in accordance with the Spill Prevention, Control, and Countermeasures (SPCC) Plan dated July <br />21, 2006, applicable regulations, and manufacturer's requirements. <br />Additional information about this tank is reported in the SPCC plan. <br />This report is based on available information and was prepared in accordance with currently accepted <br />engineering practices. No other warranty is implied or intended. This report has been prepared for the <br />sole use of Holt and applies only to the subject site and tank. Use of this report by third parties shall be at <br />their sole risk. This report was prepared under the direct supervision of the California Professional <br />Engineer (P.E.) whose signature appears below. <br />engineering -environmental Management. Inc <br />