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Nil <br /> 2 ' 1991 BLASLAND & BOUCK ENGINEERS, P.C. <br /> ENVIRONMENTAL HEALTH ENGINEERS& GEOSCIENTISTS <br /> PERMITlSERVICE6T23 Towpath Road, Box 66, <br /> Syracuse, <br /> New <br /> ork 13214 (315)446 9120 <br /> y//0 14AI NS TiP/.v Gv.4 Y <br /> April 16, 1991 <br /> D44111 & CD. <br /> Mr. Michael O. Vaughan —ZiV^ T <br /> McKesson Drug and Health Care <br /> One Post Street <br /> San Francisco, CA 94104 <br /> Re: UST Precision Testing Results <br /> File: 260.09 #2 <br /> Dear Mr. Vaughan: <br /> On March 1 and 2, 1991 , Blasland & Bouck Engineers, P.C. (Blasland & <br /> Bouck), conducted Petro-tite precision tests on underground storage tanks <br /> (USTs) at two McKesson Drug & Health Care facilities located in West <br /> Sacramento and Tracy, California. There are two 12,000-gallon diesel USTs <br /> at the West Sacramento facility and one 10,000-gallon diesel UST at the <br /> Tracy facility. All three USTs are of fiberglass construction. The West <br /> Sacramento USTs are nine years old, and the Tracy UST is eight years old. <br /> All three USTs have met the National Fire Protection Association (NFPA) <br /> criterion for tightness. The observed leak rates were all within ±0.050 <br /> gallons per hour. <br /> This program was conducted in accordance with the scope of work contained <br /> in Blasland & Bouck's proposal titled 'Underground Storage Tank Testing <br /> Program' dated August 1990. <br /> The Petro-tite method is a circulating, volumetric precision test and is <br /> approved by the NFPA. This test addresses many of the variables involved <br /> in UST testing, including temperature, tank deflection, water table location, <br /> product expansion coefficient, and vapor pockets. Each variable is discussed <br /> below: <br /> Under normal circumstances, temperature stratification occurs in <br /> petroleum products. In the Petro-tite method, temperature <br /> stratification is eliminated through circulation, resulting in temperature <br /> equilibration of the product throughout the test. <br /> Tank deflection occurs when the product level is increased. The <br /> Petro-tite test method compensates for tank deflection in the <br /> following manner. First, the rate of deflection is increased by <br /> applying a pressure head of approximately five pounds per square <br /> inch (psi). The deflection is monitored by observing the volume <br /> Syracuse, NY • Rochester, NY • White Plains, NY • Syosset, NY • Edison, NJ • Washington, DC • Columbus, OH <br /> Boca Raton, FL• Tampa, FL•Orlando, FL <br />