| Form 27/27A |  Related  Doc |
| Date Submitted: | 9/26/2024 |
| Date Recv'd: | 9/26/2024 | Assigned by: | Alexander Ahmadian |
| DocNum: | 403934799 | Facility ID: | 487298 |
| Document Type: | FORM 27 | Project Number: | 37167 |
| Operator Information: |
| Operator: | PDC ENERGY INC |
| Oper. No. | 69175 |
| Address: | 1099 18TH STREET SUITE 1500 DENVER CO 80202 |
| Type Of Facility: | SPILL OR RELEASE |
| Fac. Name | Seltzer LD Pad |
| County Name: | ADAMS |
| Operator contact: | Karen Olson |
| qtrqtr: NWNE | section: 4 | township: 1S | range: 67W | meridian: 6 |
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| Remediation Details: |
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| Reason for Report: SPILL |
| Cause of Condition: SPILL OR RELEASE |
| Potential Receptors: Surface Water within 1/4 mile - 793 ft W, Signal Reservoir #2
Occupied Buildings within 1/4 mile - 1 |
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| FURTHER SITE INV: | Boron remains in exceedance of ECMC standards and background values. PDC shall resample via hand auger the two soil samples that exceeded the boron Table 915-1 standard (S Wall-4 and E Wall-4) and will run analysis to confirm the presence of boron. Laboratory analysis will be reported in a supplemental Form 27. |
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| HOW REMEDIATE: | The excavation via hydrovac equipment has adequately remediated petroleum constituents from the release area. However, exceedances of arsenic, barium and boron still need to be resolved. Elevated pH and SAR were also present in one sample (E Wall-4) but were less than the background concentrations in the imported fill area, therefore, these levels can be attributed to native concentrations.
On 9/16/24, a produced fluids sample was collected from the separator and analyzed for total recoverable metals. These data were used to determine the mass of metals that were released in the 0.32 bbl spill (the release amount was rounded up to 1 bbl for calculation purposes). This mass was compared to the calculated mass of metals removed as a result of the excavation. Table 5 (arsenic) and Table 6 (barium) provide these calculations and comparisons. Table 7 provides a summary of the total recoverable metals from the laboratory report.
As shown on Table 5, the amount of arsenic removed was approximately 770,166 times more than the amount of arsenic that was released.
As shown in Table 6, the amount of barium removed was approximately 600 times more than the amount of barium that was released.
Since the amount of arsenic and barium removed were significantly greater than the amount of these metals that were released, the additional metals removed can be attributed to native concentrations and the presence of these metals in the excavation samples can be considered resolved.
Boron concentrations were present in two soil samples (S Wall-4 and E Wall-4) that exceeded the Table 915-1 standard. Since these concentrations were substantially greater than surrounding concentrations, PDC proposes to resample those two locations and analyze the two soil samples for boron. If the boron concentrations are less than the Table 915-1 standard, PDC will request that a no further action determination be provided by ECMC.
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| INITIAL ACTION: | On 7/16/24, an independent bypass line became compromised during pressure testing activities. Fresh water was used to conduct the pressure test; however, residual crude oil in the line mixed with the fresh water and daylighted to the surface. An estimated 0.32 BBL fresh water/oil mix was released. Impacted soil was excavated using hydrovacs. Approximately 12 cubic yards of impacted soil were removed and transported to Republic Services Tower Road Landfill for disposal. |
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| RECLAMATION PLAN: | The location will be reclaimed in accordance with the ECMC 1000 Series rules. |
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| SOURCE REMOVED: | Approximately 12 cubic yards of impacted soil were removed and transported to Republic Services Tower Road Landfill for disposal. |
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| Correspondence Log: |
| Final Resolution | | Date | Case Closed? | Letter Sent? | CECMC Person | | N/A | N | | Alexander Ahmadian | | | 6/5/2025 | Y | | Alexander Ahmadian | | | N/A | N | | Alexander Ahmadian | |
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| Coordinates: |
| Type | Facility ID | Facility Name/Num | Lat/Long |
| Facility | 487298 | Seltzer LD Pad
| 39.999206/-104.891922 |
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