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FROM (TV E)JUN 2 2009 18 :20/ST. 18 :18/N o. 8801210790 P 8 <br /> Water Boards: LG 113 . • <br /> Page 1 of 2 <br /> 4 <br /> issue Date:March 11,3008 <br /> Leak Detection Tecnologies, LLC <br /> MDleak Enhanced Leak Detection Method <br /> NON-VOLUMETRIC TANK TIGHTNESS TEST METHOD(TRACER) <br /> Certification Leak rate of 0.005 gph with PO= 97.6%and PFA= 0% <br /> Leak A tank system should not be declared tight when chemical marker is detected outside of the tank system. <br /> Threshold <br /> Applicability Gasoline,diesel,aviation fuel,fuel oil#4,fuel oil#6,solvents,waste oil,liquefied petroleum gas,natural <br /> gas. <br /> Other fluids may be tested after completion of a compatibility evaluation by the manufacturer. <br /> Tank Not limited by capacity, <br /> Capacity <br /> Waiting Time Ranges from 5 to 31 days after chemical marker Is added to the tank,when"Controlled Leak Points"are <br /> not used. <br /> The waiting period may be adjusted below this range when supported by"Controlled Leak Points"as <br /> described below. <br /> Controlled A"Controlled Leak Point"isaport where chemicalmarker is injected directly into the soil surrounding the <br /> Leak Points LIST to determine the rate at which chemical marker moves. It can be used to demonstrate that the <br /> chemical marker will migrate through the soil to a detection point in a documented amount of time,as <br /> described in manufacturer's procedures. - <br /> Chemical Dosage of chemical marker is based on factors Including tank size,tank volumes frequency and volume of <br /> Marker tank'.refills,and is determined.according tofmanufacturies procedures. <br /> Dosage <br /> soil Soil present during the evaluation was sandy in texture,with water table 200feet,below the surface. <br /> Permeability Type of soil may have an impact on the migration of vapors. <br /> Whenever the chemical marker Is.used OULSIde of the parameters of the evaluation Such as in frozen:soil <br /> or tanks buried in clay where the day could plug holes in the tank,"Controlled Leak'.Point(s)"must.be <br /> used. <br /> Sampling When sampling In backfill, radius of influence of each sampling port Is a maximum 16 feet. All tank <br /> surfaces must be within the zone of Influence of a sampling port. <br /> Sampling can betaken within a vertical or horizontal sampling port.. <br /> Sampling port Installation and sample collection are conducted per:EPA soil gas Sampling,guidance <br /> document SOP#2042. <br /> Sample Two detectors were used during the evaluation: a helium detector with minimum detection level of 2 ppm <br /> Analysis He,and a gas chromotograph with minimum detection level of 1-m0'pkpgrams,Other analytical <br /> equipment with equivalent performance capabilities may also be used <br /> Groundwater The method was not evaluated with groundwater above the bottom of the tank. <br /> http://WWW.waterboaros.ca.gov/ust/leak prevention/19113/Vendor Files/leak_detection to... 3/17/2008 <br /> L <br />