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HomeMy WebLinkAboutDERR-2024-012088 Memorandum 6440 South Millrock Drive Suite 300 Holladay, UT 84121 United States www.jacobs.com 1 Subject 2024 Annual Cofferdam and Soil Cover Inspection Report Attention Ken Wangerud/USEPA Mazie Cox/UDEQ Justin Anderson/Ogden City From Terence Mares/Jacobs Date October 28, 2024 Copies to Becky Rewey/UPRR This document presents the findings from the annual inspection of the Union Pacific Railroad (UPRR) Ogden Railyard, Operable Unit 1 cofferdam and soil cover, that occurred on September 10, 2024. This inspection was conducted to comply with section 5.f.ii of the Environmental Covenant. The inspection was completed by Terence Mares (Jacobs) on UPRR’s behalf. Mazie Cox (UDEQ) and Ryan Parent (Ogden City Area Maintenance Supervisor) were in attendance for the annual inspection. A completed cofferdam and soil cover inspection form (Attachment 1) and representative photo log (Attachment 2) are attached. Summary of Inspection Each component of the cofferdam structure was inspected. Observations on the appearance and condition of each component have been documented in the attached table and photographs are presented in the attached photo log. The rip-rap section was intact but has vegetation is coming up through the rip-rap (Photos 1 and 2). The limited vegetation shown in Photo 2 will be cut down by Ogden City. The soil cover east of the rip-rap also had vegetation coming up. Ogden City continues to handle the vegetation coming up through the rip-rap by mechanically cutting the vegetation. The soil cover was moist. (Note: The remedial design was for this soil cover to be submerged, but Ogden City has given permission to the water ski company using the pond to maintain a lower water elevation and therefore leaving the soil cover exposed and dry.) There was no evidence of subsidence or cracking of the soil cover. The drainage slope continues to be to the west toward the pond as it has historically been. The inlet control structure was not blocked and looked to be in good order (Photo 3). The inlet piping had flow into the pond and was not blocked and in good condition (Photo 4). The north and south manhole access covers over the drain line vaults were in place and secure (Photo 5 and 6). A tape measure was used to tag the bottom of each the sump and no hydrocarbon DNAPL was visually detected, on the tape measure, in either vault. 2024 Annual Cofferdam and Soil Cover Inspection Report 2 The Restricted Access signs and posts located in the cofferdam area were upright and in good condition (Photo 7). The cable holding the buoys and signage across the pond was intact and facing in the correct direction (Photo 8). The perimeter fencing was in good condition and was not compromised. All gates around the soil cover and cofferdam were intact and locked (Photo 9 and 10). Attachment 1 Cofferdam and Soil Cover Inspection Form Cofferdam and Soil Cover Inspection 21st Street Pond, Ogden, Utah 1 Item Inspection Criteria Observation Recommended Action Corrective Action Taken 1. Inlet Structure Inlet Control Structure Functional and clear of debris? Structure inlet plugged with debris? Functional – Yes Clear of debris – Yes No NO ACTION NO ACTION 2. Rip Rap Rip Rap Rip rap in place and intact, even across west face of cofferdam? Rip rap missing? Yes - Vegetation coming up through rip-rap. No Continue mechanical removal of vegetation NO ACTION Ogden City cut down remaining vegetation 3. Cover Integrity East of Cofferdam Soil Cover – Moist Is soil cover submerged? No NO ACTION Inspection Date: September 10, 2024   Inspector: Terence Mares Signature:         Cofferdam and Soil Cover Inspection 21st Street Pond, Ogden, Utah 2 Item Inspection Criteria Observation Recommended Action Corrective Action Taken 4. Manholes Manhole Access Covers Access covers in place and secure? Access covers loose and/or unsecured? Yes No NO ACTION NO ACTION Manholes Gauged For Presence of DNAPL DNAPL in North manhole? DNAPL in South manhole? No No NO ACTION NO ACTION 5. Cover Integrity East of Cofferdam Soil Cover – Moist Evidence of subsidence and ponding? Drainage slope not maintained and/or not sloping to west? Desiccation cracking? Burrow holes? No Based on visual inspection the slope is to the west. No No NO ACTION NO ACTION NO ACTION NO ACTION Soil Cover – Moist – Cover Vegetation Coverage uniform across soil cover? Bare areas or dead vegetation? Yes - Vegetation coming up through rip-rap. No Continue mechanical removal of vegetation NO ACTION Ogden City cut down remaining vegetation Cofferdam and Soil Cover Inspection 21st Street Pond, Ogden, Utah 3 Item Inspection Criteria Observation Recommended Action Corrective Action Taken 6. Discharge Piping Groundwater Discharge Pipes Pipe ends intact and undamaged? Pipes damaged? Discharge from pipes flowing freely? Pipes plugged? Yes No Yes No NO ACTION NO ACTION NO ACTION NO ACTION 7. Soil Cover and Cofferdam Security Perimeter Fence and Signage Fence intact and secure? Fence fabric broken or cut? Fence posts upright and firmly anchored? Posts loose and/or tilted? Signs intact? Sign(s) missing or damaged? Yes/Yes No Yes No Yes No/No NO ACTION NO ACTION NO ACTION NO ACTION NO ACTION NO ACTION NO ACTION Gates and Locks Gates/locks intact and operable? Gates inoperable? Locks inoperable? Yes/Yes No No NO ACTION NO ACTION NO ACTION Attachment 2 Photograph Log Photograph Log Jacobs Engineering Group Inc. 1 Project Title 2024 Annual Cofferdam and Soil Cover Inspection Report Location Ogden, Utah Date September 23, 2024 Photo 1: Overview of the cofferdam and vegetation coming up through rip-rap. Photo 2: Trees coming up near rip-rap to be removed. 2 Photo 3: Inlet to pond from the Ogden River. Photo 4: Inlet into pond from the Ogden River. Free of debris. 3 Photo 5: View of the northern vault. Both the north and south manhole covers are intact and vaults have no presence of DNAPL. Photo 6: View inside of the northern vault. 4 Photo 7: Typical restricted area sign attached to T-Post inside fenced area. Photo 8: Overview buoys and signage across the pond. 5 Photo 9: South access gate secured and operable. All gates were operable. Photo 10: Locked gate. All gates were locked.