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Home My WebLink About1520 20TH ST (4) ME57 �� V 8 14.01 FAX /1E @002 Praxair Services, inc. Technical Solutions for the Industrial World. 24/48 HOUR NOTIFICATION OF TRACER TIGHT TESTING AND/OR ENHANCED LEAK DETECTION TESTING FROM : Anthony Ptak Praxair Services, Inc 3755 N. Business Center Drive Tucson,AZ 85705 PHONE: 520-545-0234 FAX: 520-888-3923 Email: Anthony_Ptak @praxair.com DATE SENT: 02/08/08 ATTENTION: Steve Underwood Local Agency Info: City of Bakersfield Fire Department 900 Truxtun Ave,Suite 210 Bakersfield,CA 93301 Phone: 661-326-3190 Fax: 661-852-2171 SITE: ATT Communications Address: 1520 20''Street City: Bakersfield, CA County: Kern/City of Bakersfield Client Contact: Debbie Bourgaual Contact Phone#: 760-967-7666 Tank Tester: Marcus Villabrille CA License#: 05-1702 Our Job No: 39954EL Testing Date: 02/14/08 Work plan attached. The average testing period is 3 days: Confirmation Test and installation of leak detection monitoring system typically happens the first day. The inoculation of the system typically happens on day 2. Sampling&Analyses are typically done on days 2 and 3. Please advise us if you plan to have an inspector on site,so that we can coordinate the event with that person. IIIIIII VIII III Iill 58 IE ,02/0812008 14:01 FAX 11003 Date: December 17,2007 Praxair Services,Inc.QA Revised by: Randy Golding Tmc+er Tight® Approved by: Randy Golding version 6 Work Plan Site Owner Name Address City and State In Service Enhanced Leak Detection Protocol (IS-ELD) (The IS-ELD Method Utilizes an Onsite Site Laboratory for Real-Time Results) Introduction In Service Enhanced Leak Detection(IS-ELD)means a test method which is approved by the California Water Resources Control Board that ascertains the physical integrity of an underground tank system by introduction,and extemal detection, of a substance that is not a component of the fuel formulation that is stored in the tank system while the system is in service. The test method is third party certified for the capability of detecting both vapor and liquid phase releases from the underground storage tank system. The Enhanced Leak Detection test method is capable of detecting a leak rate of at least 0.005 gph or less,with a probability of detection of at least 95%and a probability of false alarm no greater than 5%. Concept Tracer Tighto is a unique method of testing underground storage systems for tightness. A unique chemical called a tracer is added to the product stored in the tank. The tracer is an inert chemical that evaporates readily from the fuel. After tracer is added to the system,it is distributed between the vapor and liquid inside the tank. Use of the system carries the tracer throughout the piping. If any small leak exists in the system,the tracer is allowed to escape from the system, either as a vapor or as a dissolved component of the liquid. Once outside the system, the dissolved racer evaporates from the liquid and the tracer vapors begin to migrate away from the location of the leak in all directions. After an appropriate waiting period,the tracer vapors are detectable at least ten feet or more away from the leak in all directions. Samples of air collected from the soil within the radius of detection of the tracer reveal the leak as a presence of the tracer chemical. Because the tracer chemical is not normally found in the environment or in fuel products,the Tracer Tights method is able to discriminate between previous contamination and current leakage. Contractor It is important that before Praxair arrives on site that the tanks receive enough fuel to avoid deliveries until the test is completed. If a fuel drop becomes necessary In order to keep the station open then contact Praxair's site project manager and schedule the drop while the crew is onsite. A clean fuel drop reduces the possibility of having to retest the site. A contractor capable of repairing any exposed component in the system including having spare parts must be onsite to expedite repairs. The contractor skills mast include the ability to operate and make adjustments to the settings of the electronics controlling the fueling system. The contractor must be capable and committed to working longer hours and extended days outside of normal work week. The owner's contractor will be in complete control of the fueling system and it is the contractor's responsibility to operate the fueling system properly and to reassemble the system back into a pretest configuration. Praxair Service,Inc.is only responsible for testing the fueling system and is not responsible for its operation. THIS INFORMATION IS THE PROPERTY OF PRAWR SER VICES.INC.. 1 of 3 02/08/'2008 14:01 FAX 0]004 Date: December 17,2007 Praxair Services,Inc.QA Revised by: Randy Golding Tracer Tight® Approved by: Randy Golding Version 6 Description The process is described in the following steps: •Preparation •Probe Array Installation •Confirmation Test •Inoculation •Leak Simulation •Sample Collection •Analysis • Spill Bucket Test •Reporting Preparation All necessary permits must be acquired and appropriate notices to local regulators must be given prior to arrival at the site. Upon arrival, the crew reviews the tank information that has been made available and uses this information to plan the installation of the sampling probe array. If"as built'plans or site plans have not been made available,the crew inspects all accessible portions of the system to learn as much as possible about the location of all UST system components. If the site is under remediation, soil vapor extraction systems,air-sparging systems and bio-venting systems must be turned off during the test.Groundwater measurements are to be taken within the tank excavation zone. Probe Array Installation The following BLD probe installation was approved by the Water Resources Control Board. Vertical PVC sampling probes are installed within eight horizontal feet of all possible leak locations(a maximum of 15 feet apart). In situations where tank pits and piping trenches do not contain engineered backfill (sand or pea-gravel), the sampling probes are installed with a maximum 10-foot spacing. Tank probes are installed along the side of each tank, generally at a depth centered on the tanks, Maximum probe depth is 15 feet(or just above the water table if applicable).Additional probes are installed near any appurtenances along the tank ridge where a containment sump is not present. Piping probes are placed along the product distribution,vapor recovery and vent piping trenches,to one half the depth of the piping or until the end of the probe is within engineered backfrll.Probes are generally installed at a depth of 1 to 1.5 feet below grade.Probes are installed by coring a hole in the pavement and inserting a sampling probe into the excavation zone of the tank or pipe.The top of each probe is fitted with a PVC sampling cap that will allow access for the collection of samples. Confirmation Test Confirmation Test (Pre-certification tightness test) is completed before the system is inoculated. The test is used to confirm the tightness of all the accessible fittings. This is done to ensure that the facility is right before adding the tracer. A repair technician should be on site with all tools and parts to complete repairs to any and all components that are accessible. The technician should be qualified/certified to program and operate the electronics controlling the fueling system. Inoculation Inoculation is the process of adding chemical tracer to the product in the system to be tested. Product is inoculated with a predetermined amount of tracer, though the fill riser. Tracer is mixed with the product by using the system. Once sufficient amount of tracer labeled product has been moved through each dispenser,the product is tested at each dispenser to confirm that tracer is present. By keeping the dispenser nozzle inside a receiving container, additional product is pumped into the container to push tracer labeled vapors through the vapor return piping back to the tank. The tracer/vapor mixture is then pushed from the UST out to the vent riser into a container of sufficient size that the tracer/vapor mixture THIS INFORMATION IS THE PROPERTY OF PRAXAIR SERVICES.INC.. 2 of 3 ,02/08/'2008 14:02 FAX 2005 Date: December 17,2007 Praxair Services,Inc.QA Revised by: Randy Golding Tracer 77ght® Approved by: Randy Golding Version b has displaced the entire volume of the vent piping. The concentration of the tracer in the receiving container is then measured. Leak Simulation Injecting a tracer into the backfill performs a leak simulation. The leak simulation tracer is not one of the tracers used in testing the system. The migration period of the leak simulation tracer is monitored through the sampling probes. The minimum migration time required for the test is equal to the time required for the leak simulation tracer to move an acceptable distance. The minimal acceptable distance is the longest distance that the test tracer would have to travel from any leak location to the location of a sampling probe. Sample Collection Once the leak simulation migration period is determined, the inoculation and waiting period is completed and sampling can begin. Vapor samples are collected from all sampling probes. Additional vapor samples may be collected from sumps containing UST components, under dispenser containers (UDCs) and from the interstitial spaces of double walled components. Sample Analysis Samples are analyzed using an on site laboratory grade gas chromatograph(CC). The CC is calibrated using an external gas standard. Samples are analyzed by direct injection into the CC. The results are evaluated by comparison to the analytical standard. Whenever tracer is detected in the subsurface samples,blanks are run to validate the tracer detection. Spill-Bucket Testing Over-spill-buckets are tested hydro-statically. A decrease in water level indicates a leak. If leaks occur,spill bucket seals should be repaired or replaced. Reporting The findings of the Tracer Tighta BLD test and site evaluation will be summarized in a written report and sent to the client within two weeks of the completion of the fieldwork. All data acquired from probe and sump samples will be reported along with spill bucket hydro-test results. I THIS INFORMATION IS THE PROPERTY OF PRAXAIR SERVICES.INC.. 3 of 3