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Home My WebLink AboutDERR-2024-005577IMPRESSED CURRENT CATHODIC PROTECTION SYSTEM EVALUATION Utah DEQ Underground Storage Tank Program TESTING PER CRITERIA & STANDARDS ESTABLISHED BY NACE AND/OR STI (STEEL TANK INSTITUTE) • Access to the soil directly over the cathodically protected structure that is being evaluated must be provided. • A site drawing depicting the UST cathodic protection system and all reference electrode placements must be completed. I. UST OWNER II. UST FACILITY COMPANY NAME: DELTA RALLY STOP ADDRESS: 75 NORTH HIGHWAY 6 & 50 CITY: DELTA STATE: UT ZIP: 84624 FACILITY NAME: DELTA RALLY STOP FACILITY ID#: 2000653 FACILITYADDRESS: 75 NORTH HIGHWAY 6 & 50 CITY: DELTA STATE: UT ZIP: 84624 COUNTY: MILLARD III. CP TESTER IV. CP TESTER’S QUALIFICATIONS TESTER’S NAME: BRYER DUNCAN COMPANY NAME: M&M CATHODIC PROTECTION ADDRESS: 303 REDBERRY RD. CITY: DRAPER STATE: UT ZIP: 84020 CP TESTERS CERTIFICATION NUMBER: UT362 EXPIRATION DATE: JANUARY 24, 2024 PHONE NUMBER: (801) 750-3061 V. REASON SURVEY WAS CONDUCTED (mark only one) Routine - 3 year Routine – within 6 months of installation 90-day re-survey after fail Re-survey after repair/modification Date next cathodic protection survey must be conducted no later than: AFTER REPAIRS (required within 6 months of installation/repair & every 3 years thereafter). VI. CATHODIC PROTECTION TESTER’S EVALUATION (mark only one) PASS All protected structures at this facility pass the cathodic protection survey and it is judged that adequate cathodic protection has been provided to the UST system (indicate all criteria applicable by completion of Section VIII). FAIL One or more protected structures at this facility fail the cathodic protection survey and it is judged that adequate cathodic protection has not been provided to the UST system (complete Section IX). INCONCLUSIVE The cathodic protection survey of an impressed current system must be evaluated by a corrosion expert. (complete Section VII). CP TESTER’S SIGNATURE: DATE CP SURVEY PERFORMED: 1-25-2024 VII. CORROSION EXPERT’S EVALUATION (mark only one) The survey must be conducted and/or evaluated by a corrosion expert when: a) supplemental anodes or other changes in the construction of the impressed current system are made; b) stray current may be affecting buried metallic structures or c) an inconclusive result was indicated in Section VI. PASS All protected structures at this facility pass the cathodic protection survey and it is judged that adequate cathodic protection has been provided to the UST system (indicate all criteria applicable by completion of Section VIII). FAIL One or more protected structures at this facility fail the cathodic protection survey and it is judged that adequate cathodic protection has not been provided to the UST system (complete Section IX). CORROSION EXPERT’S NAME: COMPANY NAME: NACE INTERNATIONAL CERTIFICATION: NACE INTERNATIONAL CERTIFICATION NUMBER: CORROSION EXPERT'S SIGNATURE: DATE REVIEWED: VIII. CRITERIA APPLICABLE TO EVALUATION (mark all that apply) -850 OFF Structure-to-soil potential more negative than –850 mV with respect to a Cu/CuSO4 reference electrode with protective current temporarily interrupted (instant-off). 100mV POLARIZ. Structure(s) exhibit at least 100 mV of cathodic polarization (at least 100mV shift negative from depolarized state or recorded native) IX. ACTION REQUIRED AS A RESULT OF THIS EVALUATION (mark only one) NONE Cathodic protection is adequate. No further action is necessary at this time. Test again by no later than (see Section V). RETEST Cathodic protection may not be adequate. Retest during the next 90 days to determine if passing results can be achieved. REPAIR/RETEST Cathodic protection is not adequate. Repair/modification is necessary as soon as practical but within the next 90 days. X. DESCRIPTION OF UST SYSTEM TANK # PRODUCT CAPACITY TANK MATERIAL PIPING MATERIAL FLEX CONNECTORS 1 PREM 12,000 GAL STEEL FRP ALL FLEXS IN CONTAIN. 2 UNL 12,000 GAL STEEL FRP ALL FLEXS IN CONTAIN. 3 DSL 12,000 GAL STEEL FRP ALL FLEXS IN CONTAIN. 4 5 6 7 XI. IMPRESSED CURRENT RECTIFIER DATA (complete all applicable) In order to conduct an effective evaluation of the cathodic protection system, a complete evaluation of rectifier operation is necessary. RECTIFIER MANUFACTURER: GUARDIAN RATED DC OUTPUT: VOLTS:48 AMPS:12 RECTIFIER MODEL: LTASSA 48-12 SS RECTIFIER SERIAL NUMBER: -522152 RECTIFIER OUTPUT AS INITIALLY DESIGNED OR LASTLY RECOMMENDED (if available): VOLTS:48 AMPS:12 TAP SETTINGS DC OUTPUT EVENT DATE COURSE FINE VOLTS AMPS HOUR METER COMMENTS "AS FOUND" 1-25-24 C 5 43.5 V 0 A 15095 0.0 mV (shunt) x .3 = 0 A "AS LEFT" 1-25-24 C 5 43.5 V 0 A 15095 0.0 mV (shunt) x .3 = 0 A XII. IMPRESSED CURRENT POSITIVE & NEGATIVE CIRCUIT MEASUREMENTS (output amperage) Complete if the system is designed to allow such measurements (i.e. individual lead wires for each anode are installed and measurement shunts are present). CIRCUIT 1 2 3 4 5 6 7 8 9 10 TOTAL AMPS ANODE (+) TANK (-) XIII. DESCRIPTION OF CATHODIC PROTECTION SYSTEM REPAIRS AND/OR MODIFICATION Complete if any repairs or modifications to the cathodic protection system are made OR are necessary. Certain repairs/modifications are required to be designed and/or evaluated by a corrosion expert (completion of Section VII required). Additional anodes for an impressed current system (attach corrosion expert’s design). Repairs or replacement of rectifer (explain in “Remarks/Other” below). Anode header cables repaired and/or replaced(explain in “Remarks/Other” below). Impressed current protected tanks/piping not electrically continuous (explain in “Remarks/Other” below). REMARKS/OTHER: XIV. UST FACILITY SITE DRAWING Attach detailed drawing of the UST and cathodic protection systems. Sufficient detail must be given in order to clearly indicate where the reference electrode was placed for each structure-to-soil potential that is recorded on the survey forms. Any pertinent data must also be included. At a minimum you should indicate the following: All tanks, piping and dispensers; All buildings and streets; All anodes and wires; Location of CP test stations; Each reference electrode placement must be indicated by a code (1,2,3 R-1, R-2, R-3etc.) corr esponding with the appropriate line number in Section XVI of this form. AN EVALUATION OF THE CATHODIC PROTECTION SYSTEM IS NOT COMPLETE WITHOUT AN ACCEPTABLE SITE DRAWING. (LARGER SITE DRAWING IS ATTACHED TO THIS SURVEY) XV. IMPRESSED CURRENT CATHODIC PROTECTION SYSTEM CONTINUITY SURVEY • This section may be utilized to conduct measurements of continuity on underground storage tank systems that are protected by cathodic protection systems. • When conducting a fixed cell - moving ground survey, the reference electrode must be placed in the soil at a remote location and left undisturbed. • Conduct point-to-point test between any two structures for which the fixed cell - moving ground survey is inconclusive or indicates possible isolation. • For impressed current systems, the protected structure must be continuous with all other protected structures in order to pass the continuity survey. NOTE: The survey is not complete unless all applicable parts of sections I-XIV are also completed DESCRIBE LOCATION OF “FIXED REMOTE” REFERENCE ELECTRODE PLACEMENT: POINT TO POINT CONTINUITY SURVEY WAS CONDUCTED STRUCTURE “A” 1 STRUCTURE “B” 2 STRUCTURE “A” 3 FIXED REMOTE INSTANT OFF VOLTAGE STRUCTURE “B” 4 FIXED REMOTE INSTANT OFF VOLTAGE POINT-TO-POINT 5 VOLTAGE DIFFERENCE (mV) ISOLATED/ 6 CONTINUOUS/ INCONCLUSIVE (example) PLUS TANK BOTTOM (example) PLUS PRODUCT LINE @ STP (example) -915 mV (example) -999 mV (example) ISOLATED (example) PLUS TANK BOTTOM (example) PLUS PRODUCT LINE @ STP (example) 22 mV (example) ISOLATED PREM TANK BOTTOM PREM FILL RISER .2 CONTINUOUS PREM TANK BOTTOM PREM ATG RISER 0.0 CONTINUOUS PREM TANK BOTTOM PREM STP RISER 0.0 CONTINUOUS PREM TANK BOTTOM PREM VENT 4.0 INCONCLUSIVE RECT. NEG. PREM VENT 0.0 CONTINUOUS UNL TANK BOTTOM UNL FILL RISER 3.4 INCONCLUSIVE UNL TANK BOTTOM UNL ATG RISER .2 CONTINUOUS UNL TANK BOTTOM UNL STP RISER .1 CONTINUOUS UNL TANK BOTTOM UNL VENT .1 CONTINUOUS RECT. NEG. UNL TANK BOTTOM .8 CONTINUOUS DSL TANK BOTTOM DSL FILL RISER .5 CONTINUOUS DSL TANK BOTTOM DSL ATG RISER .1 CONTINUOUS DSL TANK BOTTOM DSL STP RISER 0.0 CONTINUOUS DSL TANK BOTTOM DSL VENT 3.0 INCONCLUSIVE RECT. NEG. DSL TANK BOTTOM .8 CONTINUOUS REMARKS/OTHER: VENTS ALL CONTINUOUS WITH RECTIFIER NEGATIVE, HOWEVER, ON 2 OF THE TANKS WE CAN NOT GET CONTINUOUS MEASUREMENTS BETWEEN TANK BOTTOM AND VENTS. THE SYSTEM WILL REQUIRE NEW STRUCTURE AND ANODE GROUNDBED AS WELL. 1. Describe the protected structure {“A”} that you are attempting to demonstrate is continuous (e.g. plus tank bottom). 2. Describe the “other” protected structure {“B”} that you are attempting to demonstrate is continuous (e.g. plus steel product line @ STP). 3. Record the fixed remote instant off structure-to-soil potential of the protected structure {“A”} in millivolts (e.g. –915 mV). 4. Record the fixed remote instant off structure-to-soil potential of the “other” protected structure {“B”} in millivolts (e.g. –908 mV). 5. Record the voltage difference observed between structure “A” and structure “B” when conducting “point-to-point” testing (e.g. 1mV). 6. Document whether the test (fixed cell and/or point to point) indicated the protected structure was isolated, continuous or inconclusive. XVI. IMPRESSED CURRENT CATHODIC PROTECTION SYSTEM SURVEY • This section may be utilized to conduct a survey of an impressed current cathodic protection system by obtaining structure-to-soil potential measurements. • The reference electrode must be placed in the soil directly above the structure that is being tested and as far away from any active anode as practical to obtain a valid structure-to-soil potential. • Both on and instant off potentials must be measured for each structure that is intended to be under cathodic protection. • The instant off potential must be -850 mV or more negative or the 100 mV polarization criterion must be satisfied in order to pass. NOTE: This survey is not complete unless all applicable parts of sections I – XIV are also completed LOCATION 1 CODE STRUCTURE 2 CONTACT POINT 3 REFERENCE CELL PLACEMENT 4 ON 5 VOLTAGE (mV) INSTANT 6 OFF VOLT. (mV) 100 mV POLARIZATION ENDING 7 VOLTAGE (mV) VOLTAGE 8 CHANGE (mV) PASS/ FAIL 9 (example) 1 (example) PLUS TANK (example) TANK BOTTOM (example) SOIL @ REG. TANK STP MANWAY (example) -1070mV (example) -875 mV (example) PASS (example) 2 (example) DIESEL PIPE (example) DISPENSER 7/8 (example) SOIL @ DIESEL TANK STP MANWAY (example) -810 mV (example) -680 mV (example) -575 mV (example) 105 mV (example) PASS 1 PREM TANK TANK BOTTOM SOIL SOUTH -409 -408 - FAIL 2 PREM TANK TANK BOTTOM BOREHOLE CENTER -480 -479 - FAIL 3 PREM TANK TANK BOTTOM BOREHOLE NORTH -502 -501 - FAIL 4 UNL TANK TANK BOTTOM SOIL SOUTH -517 -516 - FAIL 5 UNL TANK TANK BOTTOM BOREHOLE CENTER -482 -481 - FAIL 6 UNL TANK TANK BOTTOM BOREHOLE NORTH -511 -510 - FAIL 7 DSL TANK TANK BOTTOM SOIL SOUTH -471 -470 - FAIL 8 DSL TANK TANK BOTTOM BOREHOLE CENTER -466 -465 - FAIL 9 DSL TANK TANK BOTTOM BOREHOLE NORTH -522 -521 - FAIL 10 - - - 11 - - - 12 - - - 13 - - - 14 - - - 15 - - - 16 - - - 17 - - - 18 - - - 19 - - - 20 - - - 21 - - - 22 - - - 23 - - - 24 - - - 25 - - - 26 - - - 27 - - - 28 - - - 29 - - - 30 - - - 31 - - - 32 - - - 33 - - - 34 - - - 35 - - - 36 - - - 37 - - - 38 - - - 39 - - - 40 - - - 41 - - - REMARKS/OTHER: TANKS ALL FAIL MINIMUM REQUIREMENTS FOR CATHODIC PROTECTION. ANODE GROUNDBED IS DEPLETED. HOUR METER ON RECTIFIER IS NOT FUNCTIONAL AND SHOULD BE REPLACED. RECTIFIER IS PUTTING OUT 0 AMPS CURRENT. RECTIFIER WAS TESTED WITH A 1-OHM PRECISION RESISTOR AND VERIFIED TO BE OPERATIONAL. 1. Designate numerically or by code on the site drawing each local reference electrode placement (e.g. 1,2,3 T-1, T-2, P-1, P-2etc.). 2. Describe the structure that is being tested (e.g. plus tank; diesel piping; flex connector, etc.). 3. Describe where the structure being tested is contacted by the test lead (e.g. plus tank bottom; diesel piping @ dispenser 7/8; etc.). 4. Describe the exact location where the reference electrode is placed for each measurement (e.g. soil @ regular tank STP manway; soil @ dispenser 2, etc.) 5. {Applies to all tests} Record the structure-to-soil potential (voltage) observed with the current applied (e.g. –1070 mV). 6. {Applies to all tests} Record the structure to soil potential (voltage) observed when the current is interrupted (e.g. 680 mV). 7. {Applies to 100 mV polarization test only} Record the voltage observed at the end of the test period (e.g. 575 mV). 8. {Applies to 100 mV polarization test only} Subtract the final voltage from the instant off voltage (e.g. 680 mV – 575 mV = 105 mV). 9. Indicate if the tested structure passed or failed one of the two acceptable criteria (850 instant off or 100 mV polarization) based on your interpretation of data. ATTACHMENT 1 - LARGER SITE DRAWING: ATTACHMENT 2 - CERTIFICATION OF CP TESTER: