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Home My WebLink AboutDERR-2025-001319IMPRESSED 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 COMPANY NAME: JACKSONS FOOD STORES ADDRESS: 3450 E. COMMERCIAL COURT CITY: MERIDIAN STATE: ID ZIP: 83642 FACILITY NAME: JACKSONS #238 FACILITY ID#: 1200338 FACILITYADDRESS: 4805 SOUTH 1900 WEST CITY: ROY STATE: UT ZIP: ZIP 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: 12-11-2024 (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: 6-11-2024 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: 6-14-2024 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 PREM 10,000 GAL STIP3 FRP CP@STP/CONTAIN@DISP 2 UNL 10,000 GAL STIP3 FRP CP@STP/CONTAIN@DISP 3 DSL 6,000 GAL STIP3 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: LTASSA-48-12-C RECTIFIER SERIAL NUMBER: 93259 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" 6-11-2024 A 2 0 V 0 A 57426/4 0 mV (shunt) x 0.3 = 0 A "AS LEFT" 6-11-2024 A 3 7.7 V 3.69 A 57426/4 12.3 mV (shunt) x 0.3 = 3.69 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: TESTS WERE CONDUCTED TO ESTABLISH STRUCTURE CONNECTION. THIS SERVICE STATION WAS UNDER REMODEL AND PER OUR INSTRUCTION, THEY EXCAVATED CERTAIN AREAS AND TRENCHED OUT FOR OUR ANODE AND STRUCTURE HEADER WIRES. RECTIFIER WAS RELOCATED. WE FOUND THAT THE DSL TANK CONNECTION WAS ABLE TO BE REUSED. WE INSTALLED NEW CADWELDED TANK TOP CONNECTION ON PREM AND UNL TANKS. FOLLOWING THAT WORK WE INSTALLED 6 ANODES PER ENGINEERS DESIGN. ALL NEW HEADER WIRES WERE RAN TO NEW LOCATION OF RECTIFIER AND CONNECTED. BOND WIRE FROM TANK TOP TO (SEE NEXT COMMENT) 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 326 ISOLATED PREM TANK BOTTOM PREM STP RISER 239 ISOLATED PREM TANK BOTTOM PREM ATG RISER 109 ISOLATED PREM TANK BOTTOM PREM TANK TOP 0.1 CONTINUOUS PREM TANK BOTTOM RECT. NEG. 0.2 CONTINUOUS DSL TANK BOTTOM DSL FILL RISER 308 ISOLATED DSL TANK BOTTOM DSL STP RISER 236 ISOLATED DSL TANK BOTTOM DSL ATG RISER 196 ISOLATED DSL TANK BOTTOM DSL TANK TOP 0.2 CONTINUOUS DSL TANK BOTTOM RECT. NEG. 0.1 CONTINUOUS UNL TANK BOTTOM UNL FILL RISER 296 ISOLATED UNL TANK BOTTOM UNL STP RISER 159 ISOLATED UNL TANK BOTTOM UNL ATG RISER 360 ISOLATED UNL TANK BOTTOM UNL TANK TOP 0.3 CONTINUOUS UNL TANK BOTTOM RECT. NEG. 0.4 CONTINUOUS REMARKS/OTHER: STP PIPING WAS ALREADY ESTABLISHED WITH A BOND TO THE TANK SHELLS. FOLLOWING OUR WORK WE CONDUCTED A FULL SURVEY AND FOUND THAT TANKS AND STP'S PASS ALL MINIMUM REQUIREMENTS. ADDITIONALLY, ALL TANK BOTTOMS ARE CONTINUOUS WITH EACH FLEX CONNECTORS AT STP. 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 BOREHOLE NORTH -3151 -854 - PASS 2 PREM TANK TANK BOTTOM BOREHOLE CENTER -3174 -869 - PASS 3 PREM TANK TANK BOTTOM BOREHOLE SOUTH -2523 -833 -520 313 PASS 3 DSL TANK TANK BOTTOM BOREHOLE NORTH -2556 -813 -503 310 PASS 4 DSL TANK TANK BOTTOM BOREHOLE CENTER -2370 -767 -501 266 PASS 5 DSL TANK TANK BOTTOM BOREHOLE SOUTH -2670 -880 - PASS 5 UNL TANK TANK BOTTOM BOREHOLE NORTH -2582 -833 -523 310 PASS 5 UNL TANK TANK BOTTOM BOREHOLE CENTER -3386 -896 - PASS 8 UNL TANK TANK BOTTOM BOREHOLE SOUTH -3364 -976 - PASS 9 PREM TANK PIPE AT STP BOREHOLE CENTER -1259 -596 -426 170 PASS 10 DSL TANK PIPE AT STP BOREHOLE CENTER -1228 -575 -416 159 PASS 11 UNL TANK PIPE AT STP BOREHOLE CENTER -1320 -585 -410 410 PASS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - REMARKS/OTHER: SYSTEM PASSES ALL MINIMUM REQUIREMENTS FOR CATHODIC PROTECTION. WE WILL BE SEDING A PROPOSAL TO CONDUCT THE FEDERAL AND STATE LAW REQUIRED 6 MONTH FOLLOWUP SURVEY TO BE COMPLETED NO LATER THAN DECEMBER 2024. 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 May 15, 2024 Jackson's Store #238 ATTN: Steve Bennett Facility ID: 1200338 4805 South 1900 West Roy, UT SUBJ: SPECIFICATION FOR IMPRESSED CURRENT CP SYSTEM DESIGN Mr. Bennett, 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 Jackson's Store #238, Facility ID: 1200338, 4805 South 1900 West, Roy, 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 all tanks are currently electrically continuous with each other (as this system has been protected via an impressed current CP system for some time). 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 Jackson's Store #238, Facility ID: 1200338, 4805 South 1900 West, Roy, UT consists of three (3) Underground Fuel Storage Tanks (UST) that are steel in construction, with FRP piping and flex connecters at STPs with ICCP and flex connectors at dispensers in containment. CP has been provided for many years via an installed impressed current system. Recent concrete repair work has damaged the cathodic protection system min several areas. M&M Cathodic Protection Service, Inc. was commissioned to design and install a new cathodic protection anodes groundbed and structure wiring from the relocated rectifier to the tank systems. In preparation of a CP system design to replace the groundbed at the facility, past data was reviewed. PHYSICAL DESCRIPTION OF LOCATION: Quantity of three underground storage tanks constructed of steel, located in close proximity to each other (within a 20’ x 55’ area). PROPERTIES OF ELECTROLYTE (soil): Soil Type: Assumed native with backfill Page 2 of 6 M&M Cathodic Protection Services ■ 303 Redberry Rd. Draper, UT 84020 ■ Phone: (888) 763-8572 Website: CathodicProtectionUtah.com TANK SPECIFICATIONS: Tank #1: (REG), 10,000 gallon, type Steel. Diameter: 8’, Length: 27’ Tank #2: (DSL), 6,000 gallon, type Steel. Diameter: 8’, Length: 16’ Tank #3: (PREM), 10,000 gallon, type Steel. Diameter: 8’, Length: 27’ 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: (REG) surface area: 779.16 ft2 Tank #2: (DSL) surface area: 502.66 ft2 Tank #3: (PREM) surface area: 779.16 ft2 Total surface area for all tanks (protected structure): 2,060.98 ft2 CP SYSTEM DESIGN CALCULATIONS: ANODE GROUNDBED OVERVIEW To provide CP for 100% of the external surface (2,060.98 ft2), assuming the external surface was not coated, the total current requirement would be approx. 56.67 Amps. This was calculated utilizing a current requirement of 25mA 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. 5.66 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 (25mA 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 3: 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): 5.66 Amps Utilization Factor: .85 Minimum Number of anodes needed: 3.19 Anodes After taking into consideration the above, as well as desired current distribution (these tanks are arrange in a vertical row), we specified a quantity of 6 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 up to 10% of the total surface of 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 4: 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: LTASSA-48-12-C RATED DC OUTPUT: 48 VOLTS, 12 AMPS SERIAL NUMBER: 93259 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 3: 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 4: Loresco Type RS-3, Rapid Sinking, Super Conducting Earth Contact Backfill