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0 fA /57 0��,r,, <br />D <br />PROFESSIONAL TANK SERVICES, LTD. 1912 Raymond Drive Northbrook, IL 60062 (312) 291-0113 <br />0 i ■op ... <br />,. <br />.► <br />sub <br />.......:...... <br />September 17, 1986 <br />Chevron U.S.A., Inc. <br />2 Annabel Lane Suite 200 <br />San Ramon, Ca. 94583 <br />Re: Tank system testing 09-09-86 <br />Chevron Sta #5775 <br />301 RBttleman Lane <br />Lodi, Ca. <br />Dear Tony Arado: <br />O <br />DEC 16 198b <br />ENVIROMENTAL HEALTH <br />FERMIVSERVICES <br />The tank systems tested at this location are identified as <br />follows: <br />Tank <br />system <br />#1 <br />South <br />10,000 <br />Gallon <br />Unleaded. <br />Tank <br />system <br />#2 <br />Center <br />10,000 <br />Gallon <br />Super Unleaded <br />Tank <br />system <br />#3 <br />North <br />10,000 <br />Gallon <br />Regular. <br />The National Fire Protection Association's criteria for a tight <br />tank system is a system with a rate of leak less than .050 <br />gal/hr. These are calculated, mathematical tolerances only and <br />are not meant to indicate the permission of any leak. <br />During the stand -pipe test procedure the liquid hydrostatic pres- <br />sure applied to the underground tank system is generally two to <br />three times greater than normal liquid storage pressures. This <br />increase in hydrostatic pressure will amplify the indicated rate <br />of leak accordingly. <br />Tank #1 showed a leak rate of -.017 gal/hr. <br />Tank #1 is tight. <br />Tank #2 showed a leak rate of -.014 gal/hr. <br />Tank #2 is tight. <br />Tank #3 showed a leak rate of -.021 gal/hr. <br />Tank #3 is tight. <br />Precision Tank Testng <br />on page 2 <br />Professional Tank Services, Ltd. • Safe • Secure • Systematic <br />