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Home My WebLink AboutDERR-2024-006851IMPRESSED CURRENT CATHODIC PROTECTION SYSTEM EVALUATION 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 FACILITY NAME: GOLDEN SPIKE SINCLAIR FACILITY ID#: 1200059 FACILITYADDRESS: 5500 WEST 5500 SOUTH CITY: HOOPER STATE: UT ZIP: 84315 COUNTY: WEBER FACILITY NAME: GOLDEN SPIKE SINCLAIR FACILITY ID#: 1200059 FACILITYADDRESS: 5500 WEST 5500 SOUTH CITY: HOOPER STATE: UT ZIP: 84315 COUNTY: WEBER III. CP TESTER IV. CP TESTER’S QUALIFICATIONS TESTER’S NAME: ALEX ALLEY COMPANY NAME: M&M CATHODIC PROTECTION ADDRESS: 303 REDBERRY RD. CITY: DRAPER STATE: UT ZIP: 84020 PHONE NUMBER: (801) 750-3061 CP TESTERS CERTIFICATION NUMBER(s) & EXPIRATION DATE(s): STEEL TANK INSTITUTE CP INSPECTOR: #CP-16678 EXP:8-31-2025 UTAH: CP TESTER #UT416 EXPIRES 11-7-2024 WYOMING: CP TESTER #CP-2022-C-08 EXPIRES 8-31-2025 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: 10-16-2024 (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: 4-16-2024 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: DALE CLAASSEN COMPANY NAME: M&M CATHODIC PROTECTION SERVICES, INC. NACE INTERNATIONAL CERTIFICATION: CP4-CATHODIC PROTECTION SPECIALIST NACE INTERNATIONAL CERTIFICATION NUMBER: 9179 CORROSION EXPERT'S SIGNATURE: DATE REVIEWED: 4-17-2024 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 DSL 12,000 GAL STEEL FRP CP@STP/CONTAIN@DISP 2 PREM 12,000 GAL STEEL FRP CP@STP/CONTAIN@DISP 3 UNL 12,000 GAL STEEL FRP CP@STP/CONTAIN@DISP 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: GVASSA 48-12-4-B RECTIFIER SERIAL NUMBER: 70472 RECTIFIER OUTPUT AS INITIALLY DESIGNED OR LASTLY RECOMMENDED (if available): VOLTS:VOLTS AMPS:AMPS TAP SETTINGS DC OUTPUT EVENT DATE COURSE FINE VOLTS AMPS HOUR METER COMMENTS "AS FOUND" 4-16-2024 A 2 16 V 1.0 A 879814 9.1 mV (shunt) x 0.12 = 1.0 A "AS LEFT" 4-16-2024 B 1 14 V 6.6 A 879819 55 mV (shunt) x 0.12 = 6.6 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: PER CORROSION EXPERT'S DESIGN, WE INSTALLED 5 IMPRESSED CURRENT ANODES SURROUNDING THE TANK FARM. FOLLOWING PRECAUTIONARY TESTS FOR CONTINUITY WE FOUND THAT THE UNL TANK WAS SOMEHOW ISOLATED FROM THE STRUCTURE CONNECTION AT THE RECTIFIER. WE BONDED THE UNL TANK INTO THE SYSTEM VIA A HEAVY DUTY CLAMP AT THE STP TO THE PREMIUM TANK'S STP. AFTER WORK WAS COMPLETED WE PERFORMED A FULL SURVEY AND FOUND ALL EACH TANK PASSED MINIMUM REQUIRMENTS. ALL WORK OVERSEEN BY UTAH UST CP INSTALLER ROBERT BUTNER. 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 DSL TANK BOTTOM DSL VENT 0.3 CONTINUOUS DSL FILL RISER DSL VENT 0.9 CONTINUOUS UNL TANK BOTTOM UNL VENT 8.2 INCONCLUSIVE UNL TANK TOP UNL STP RISER 0.1 CONTINUOUS UNL STP RISER PREM STP RISER 0.0 CONTINUOUS PREM TANK BOTTOM PREM VENT 0.3 CONTINUOUS PREM STP RISER PREM VENT 0.2 CONTINUOUS RECTIFIER NEGATIVE VENTS 0.1 CONTINUOUS REMARKS/OTHER: NO ISSUES FOUND WITH CONTINUITY SURVEY 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 DSL TANK TANK BOTTOM BOREHOLE EAST -1483 -900 - PASS 2 DSL TANK TANK BOTTOM BOREHOLE CENTER -1189 -1038 - PASS 3 DSL TANK TANK BOTTOM BOREHOLE WEST -3160 -942 - PASS 4 PREM TANK TANK STP BOREHOLE NORTH -1544 -1022 - PASS 5 PREM TANK TANK STP BOREHOLE CENTER -1008 -953 - PASS 6 PREM TANK TANK STP BOREHOLE SOUTH -1703 -882 - PASS 7 UNL TANK TANK STP BOREHOLE NORTH -1531 -921 - PASS 8 UNL TANK TANK STP BOREHOLE CENTER -970 -899 - PASS 9 UNL TANK TANK STP BOREHOLE SOUTH -1825 -850 - PASS 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: ALL CATHODIC PROTECTION POTENTIALS MEET OR EXCEED MINIMUM REQUIREMENTS, PER STI. NOTE: THE RECTIFER HAS AN INTERNAL ISSUE WHICH CAUSES IT TO SHUT OFF WHEN BUMPED. THIS SHOULD BE ADDRESSED IMMEDIATLY WITH TROUBLSHOOTING OF THE RECTIFIER TO CORRECT OR RECTIFIER REPLACEMENT. WE WILL SEND A PROPOSAL TO ADDRESS THIS ISSUE. 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: ATTACHMENT 3 – REFERENCE ELECTRODE CALIBRATION TEST PERFORMED Copper-Copper Sulfate reference electrode field calibration test (half-cell) The following reference electrode calibration test is performed quarterly: Visual inspection: The field reference electrode should always have a quantity of undissolved copper sulfate crystals present in the solution to assure that the solution is saturated. The solution should be azure blue and clear since contaminants can make the solution cloudy. Parts required to perform field calibration test: QUANTITY DESCRIPTION 1 COPPER-COPPER SULFATE CuCu/SO 4 HALF CELL – CALIBRATION STANDARD – NOT USED IN FIELD 1 COPPER-COPPER SULFATE CuCu/SO 4 HALF CELL – TO BE CALIBRATED – FIELD REFERENCE ELECTRODE INSTRUCTIONS: 1. Place both the CALIBRATION STANDARD – NOT USED IN FIELD half-cell and the half cell to be calibrated into a container of distilled water. 2. Connect the half-cells to the leads of a voltmeter capable of giving reading in mill volts. 3. Turn on the voltmeter and see if the voltmeter reads a potential difference of (+/-) 10mV or more. 4. Wait up to five (5) minutes. 5. If half-cells show 10mV or more difference of potential, the half-cell being calibrated is out of calibration and should be replaced or cleaned and re-checked. ATTACHMENT 4 – FLUKE MULTIMETER CALIBRATION The following equipment shows the Fluke Multi-meters used for testing of CP potentials for these surveys: The 77, 87, 175, 177, & 179 Manufacturer’s Calibration Information provides the information necessary to adjust and verify the performance of the Fluke Models 175, 177, and 179 True RMS Multi-meters. WE PERFORM A PERFORMANCE TEST ON THESE DEVICES QUARTERLY (within the last 90 days): The performance tests verify the operation of the Meter when measuring low voltage DC potentials, such as those encountered during a CP survey. We check the accuracy of each Meter function against its specifications as referenced to a precision, stable, low-voltage supply reference that is accurate to within 0.007% (plus or minus 350uV) as measured by a calibrated 8.5 digit Keysight 3458A DMM that has an accuracy of 0.0008% (Keysight Technologies, Loveland Standards and Calibration Labs Certificate of Calibration 1-7581424013-1, (valid through January 21, 2024). If meter fails any part of the test per specifications of the manufacturer (+/- .09 volt @ 5 VDC ), calibration adjustment and/or repair is indicated it is sent to the manufacturer for repair and or calibration. WE PERFORM A CALIBRATION ON THESE DEVICES QUARTERLY (within the last 90 days): Calibration test of multi-meters was performed against its specifications as referenced to a precision, stable, low-voltage supply, as indicated above. Signature showing calibration test of multi-meters completed within the last 90 days: ____________________________ Signature ____________________________ Printed Name RRRRobert Butner, STI CP INspector/ NACE CP2obert Butner, STI CP INspector/ NACE CP2obert Butner, STI CP INspector/ NACE CP2obert Butner, STI CP INspector/ NACE CP2 Page 1 of 6 M&M Cathodic Protection Services ■ 303 Redberry Rd. Draper, UT 84020 ■ Phone: (888) 763-8572 Website: CathodicProtectionUtah.com April 14, 2024 Golden Spike Sinclair ATTN: Nick Manning Facility ID: 1200059 5500 West 5500 South Hooper, UT SUBJ: SPECIFICATION FOR IMPRESSED CURRENT CP SYSTEM DESIGN Mr. Manning, We completed the design for the replacement of the CP anode groundbed for the 3 underground storage tanks at your property. The specification and design criteria for this system are listed below. SPECIFICATION AND DESIGN- GENERAL The CP (herein referred to as “CP”) system was designed to provide proper CP potentials to properly protect the underground storage tanks located at Golden Spike Sinclair, Facility ID: 1200059, 5500 West 5500 South, Hooper, UT. Proper CP potential is defined as: A negative (cathodic) potential of at least 850 mV with the CP applied. This potential is measured with respect to a Copper Copper-Sulfate Electrode (CSE) contacting the electrolyte. Voltage drops other than those across the structure/electrolyte boundary must be considered for valid interpretation of this potential measurement. Review of past CP reports show that two tanks are currently electrically continuous with the rectifier. However the UNL tank showed issues with continuity to the rectifier. A review of the operating history of the UST system from provided reports was completed, including the date of installation, tightness testing, internal inspection (where available), leak history (where available), previous structure-to-soil potentials, and as-built drawings (where available). This system was designed per criteria from NACE SP0285-2011 (formerly RP0285), “Corrosion Control of Underground Storage Tank Systems by CP” SPECIFICATION AND DESIGN – APPLICATION SPECIFIC The project Golden Spike Sinclair, Facility ID: 1200059, 5500 West 5500 South, Hooper, UT consists of three (3) Underground Fuel Storage Tanks (UST) that are steel in construction, with FRP piping and flex connecters in containment. CP has been provided for many years via an installed impressed current system. The most recent CP survey performed, showed that the system was not operating per minimum CP specifications. M&M Cathodic Protection Service, Inc. conducted a series various tests on the system, groundbed, wiring, and rectifier. After testing, it was determined that the anode ground bed was depleted and required replacement. Additionally a structure bond from the UNL tank to the PREM tank is also required to ensure continuity to the UNL tank. In preparation of a CP system design to replace the groundbed at the facility, past data was reviewed. It was determined to install an impressed current groundbed around all three (3) USTs. It should be noted once the proposed bond from UNL to PREM is completed that continuity testing will confirm the integrity of the electrical bonding between all of the tanks in this system. PHYSICAL DESCRIPTION OF LOCATION: Quantity of three (3) 12,000 gallon capacity underground storage tanks constructed of steel, located in close proximity to each other (within a 40’ x 35’ area). Page 2 of 6 M&M Cathodic Protection Services ■ 303 Redberry Rd. Draper, UT 84020 ■ Phone: (888) 763-8572 Website: CathodicProtectionUtah.com PROPERTIES OF ELECTROLYTE (soil): Soil Type: Assumed native with backfill TANK SPECIFICATIONS: Tank #1: (DSL Tank), 12,000 gallon, type Steel. Diameter: 8’, Length: 32’ Tank #2: (PREM Tank), 12,000 gallon, type Steel. Diameter: 8’, Length: 32’ Tank #3: (UNL Tank), 12,000 gallon, type Steel. Diameter: 8’, Length: 32’ Per our continuity test, all tanks are electronically continuous to each other. Therefore total surface area for the protected structure is the sum of surface areas for all tanks. Tank #1: (Diesel Tank) surface area: 904.32 ft2 Tank #2: (PREM Tank) surface area: 904.32 ft2 Tank #3: (UNL Tank) surface area: 904.32 ft2 Total surface area for all tanks (protected structure): 2,712.96 ft2 CP SYSTEM DESIGN CALCULATIONS: ANODE GROUNDBED OVERVIEW To provide CP for 100% of the external surface (2,712.96 ft2), assuming the external surface was not coated, the total current requirement would be approx. 59.68 Amps. This was calculated utilizing a current requirement of 20mA per ft2, which provides for adequate protection for the soil resistivity range to be expected for this region. Additionally, a Safety Factor (the application of intentional error in the calculations which would move the result toward a more protected state) of 10% was added to compensate for any anomalies that could be encountered. Because the external surface of the tanks is coated, we calculated the CP system current requirements to protect 10% of the external surface (meaning we are calculating to provide CP to all external tank surfaces in the event that 10% of the external coating failed). To properly protect 10% of the external tanks surface, a CP current requirement of approx. 5.96 Amps would be required; this is because the other 90% of the external surface is protected by the intact coating. This result is based upon a number of assumptions, actual current usage for the system is dependant on the actual coating condition and other factors. However, with the high current requirement variable used (20mA per ft2) in these calculations, along with the Safety Factor added, we expect this system to operate at or above the design specification herein. CP SYSTEM DESIGN CALCULATIONS: NUMBER OF ANODES REQUIRED (based on consumption weight) To calculate the number of anodes necessary we used the following calculations (reference industry standard NW Cathodic High Silicon Chrome Cast Iron anodes PN #60100, see ATTACHMENT: NW Cathodic High Silicon Chrome Cast Iron anodes PN #60100 Specification Sheet: Weight per anode: NW Cathodic PN #60100 = 50lbs. Consumption Rate: NW Cathodic PN #60100 = between 0.2 and 1.2 lbs per A-yr. (We used the 1.2 lbs per A-yr) Desired Life: 20 years Current Requirement (to protect 10% of surface area): 5.96 Amps Utilization Factor: .85 Minimum Number of anodes needed: 3.3 Anodes After taking into consideration the above as well as adequate current distribution for the life of the system, we specified a quantity of 5 NW Cathodic PN #60100 High Silicon Chrome Cast Iron anodes to replace the damaged groundbed. Based on calculations, we can expect to provide effective CP for the tanks for a period exceeding 20 years or more. Page 3 of 6 M&M Cathodic Protection Services ■ 303 Redberry Rd. Draper, UT 84020 ■ Phone: (888) 763-8572 Website: CathodicProtectionUtah.com BORE HOLE SIZE AND ANODE PLACEMENT Anode holes are to be bores using non-destructive Hydrovac, approx. 8" to 12" in diameter, approx. 6' to 9' down. Placed per ATTACHMENT 1: System Design Layout & Anode Placement. Once anodes are placed, all bore holes are then to be filled with Loresco Type RS-3, Rapid Sinking and Super Conducting Earth Contact Backfill to within 6” to 12” of grade. TYPE OF EARTH CONTACT BACKFILL RECOMMENDED Loresco earth contact backfills are produced exclusively for the corrosion control industry. Each type has been modified to enhance the functionality in relation to its suggested use. The enhancements insure intimate anode contact and enable electrolytic discharge to occur at the backfill periphery. All Loresco products have a greater than 99% fixed carbon content. This high carbon content, coupled with low resistivity, assures long system performance. Loresco earth contact backfills set the performance standard. See ATTACHMENT: Loresco Type RS-3, Rapid Sinking and Super Conducting Earth Contact Backfill Specification Sheet. TYPE OF RECTIFIER RECOMMENDED No rectifier is recommended, because the existing rectifier has been verified to be operating properly and will provide protection current necessary, per this CP design specification. Our technician installed a 1 Ohm precision power resistor on the rectifier DC output and verified proper operation over a range of output settings. Specifications of existing rectifier are listed below: MANUFACTURER: Guardian MODEL: GVASSA 48-12-4-B RATED DC OUTPUT: 48 VOLTS, 12 AMPS SERIAL NUMBER: 70472 Submitted for review and approval of M&M Corrosion Expert, by NACE Cathodic Protection Technician: Robert A. Butner NACE (National Association of Corrosion Engineers) CP2, Certification Number #59361 Steel Tank Institute - UST STI Inspector, Certification #CP-16053 State of Utah DERR Certified UST Installer, Certification #TL-0471 State of Utah DERR Certified UST CP Tester, Certification #0362 State of Wyoming DEQ Certified UST CP Tester, License #CP-2017-C-22 REVIEWED/APPROVED BY CORROSION EXPERT/NACE CATHODIC PROTECTION SPECIALIST (CP4): SIGNATURE: ________________________________________ NAME: Dale Claassen, P.E., NACE CP4 COMPANY NAME: M&M Cathodic Protection Service, Inc. NACE INTERNATIONAL CERTIFICATION: Cathodic Protection Specialist (CP4) & Corrosion Engineer NACE INTERNATIONAL CERTIFICATION NUMBER: CP4 - 9179 Page 4 of 6 M&M Cathodic Protection Services ■ 303 Redberry Rd. Draper, UT 84020 ■ Phone: (888) 763-8572 Website: CathodicProtectionUtah.com ATTACHMENT 1: System Design Layout & Anode Placement Page 5 of 6 M&M Cathodic Protection Services ■ 303 Redberry Rd. Draper, UT 84020 ■ Phone: (888) 763-8572 Website: CathodicProtectionUtah.com ATTACHMENT 2: NW Cathodic High Silicon Chrome Cast Iron anodes PN #60100 Specification Sheet Page 6 of 6 M&M Cathodic Protection Services ■ 303 Redberry Rd. Draper, UT 84020 ■ Phone: (888) 763-8572 Website: CathodicProtectionUtah.com ATTACHMENT 3: Loresco Type RS-3, Rapid Sinking, Super Conducting Earth Contact Backfill