UTC Case Docket Document Sets

Filing UG - 240588

Company: Northwest Natural Gas Company

DBA: NW Natural

Filing Type: Tariff Revision

Case Status: Closed

Dates (Opened & Effective): 07/15/2024 & 11/01/2024

Summary: Revises Tariff WN-6, Schedule 303, Washington Environmental Cost Recovery Mechanism, for remediation expenses associated with natural gas services incurred between January 1, 2023, and December 31, 2023, increasing revenues by $684,585, or 0.56 percent. A residential customer with average monthly usage of 57 therms would see a bill increase of $0.44 per month, or approximately 0.5 percent.

Document Type	Date	Description
Initial Filing	07/15/2024	Revises Tariff No. WN U-6, on behalf of Northwest Natural Gas Company d/b/a NW Natural, from Kyle Walker. USMS0038124.pdf 961 KB GASCO0051527.PDF 2 MB 2023-03-15 - February 2023 DMR.pdf 129 KB Tier4_2001036.pdf 58 MB Tier4_1903649.pdf 9 MB 2023-12-27 - FW_ Inspection Letter - NW Natural_Redacted.pdf 375 KB Anchor_A0A0639_Lvl_IV_DP.pdf 75 MB 2023-11-21 - FW_ Gasco Site_ DNAPL Monitoring Semiannual Summary Report January 1 through June 30, 2023_Redacted.pdf 349 KB 2023-06-16 - FW_ Final PGM Year 2 Monitoring Report is posted for download_Redacted.pdf 407 KB Tier4_2001350.pdf 50 MB 2023-08-15 - 2023-07 Gasco Prog Rpt.pdf 75 KB Anchor_A1D0628_Lvl_IV_DP.pdf 39 MB Anchor_A0D0476_Lvl_IV_DP.pdf 126 MB 2023-05-23 - 64379PW PermitWaiver20230523 (PGM).pdf 2 MB 2023-05-19 - FW_ Gasco_ Weekly Water Levels_ Koppers and LNG Basin Area_Redacted.pdf 325 KB Tier4_2001131.pdf 28 MB Tier4_2104189.pdf 52 MB Anchor_A0D0758_Lvl_IV_DP.pdf 104 MB 2023-09-26 - FW_ September 12, 2023 - DNAPL Dissolution Modeling Approach - Meeting Notes_Redacted.pdf 101 KB GASCO0050094.pdf 800 KB Tier4_2000411.pdf 36 MB 2023-11-01 - 02_FW_ NW Natural Gasco Property_ 1st Qtr 2023-2024 DMR_Redacted.pdf 181 KB 2023-10-05 - T-100 Coalescing Media Residuals Disposal Package.pdf 6 MB 310685_Results 122719.pdf 153 KB L1957339_ddp.pdf 17 MB Anchor_A0D0784_Lvl_IV_DP.pdf 41 MB Tier4_2002050.pdf 10 MB GASCO0051566.PDF 894 KB GASCO0066610.pdf 8 MB GASCO0049660.pdf 659 KB K2010413.pdf 18 MB 21E0081 CLPLIKE (Rev2).PDF 136 MB Anchor_A1C1211_Lvl_IV_DP.pdf 117 MB Tier4_1903655.pdf 48 MB 2023-07-28 - HCC 2022 Annual Report_FINAL_2023.07.28_Tagged.pdf 75 MB GASCO0053957.pdf 659 KB GASCO0049483.pdf 7 MB Anchor_A0G0472_Lvl_IV_DP.pdf 154 MB Tier4_1904161 Revision 1.pdf 79 MB Anchor_A0A0645_Lvl_IV_DP.pdf 51 MB B1NC0008207.pdf 702 KB 2023-07-03 - FW_ Details of Ecological Soil RBC_PRG Information Requested (DEQ Response)_Redacted.pdf 215 KB 21C0197 CLPLIKE (Rev0).PDF 54 MB A9J0663_Lvl_IV_DP.pdf 137 MB Tier4_2001111.pdf 114 MB 2023-09-28 - 2022 HC&C System Annual Report_DEQ Comments.pdf 309 KB Anchor_A0B0286_Lvl_IV_DP_AQrev_050420.pdf 59 MB Anchor_A0E0672_Lvl_IV_DP.pdf 105 MB 2023-03-31 - PGM Revised Year 2 Mon Report_DEQ Comments_033123.pdf 292 KB 2023-07-14 - FW_ _External_HC&C Operational Figures_Redacted.pdf 153 KB Tier4_1903431.pdf 20 MB 2023-02-02 - NWN Gasco 1200-z DMR Q2_2022-23.pdf 3 MB GASCO0054187.pdf 681 KB DownloadSanDiskSecureAccess_Mac.pdf 353 KB Anchor_A0E0280_Lvl_IV_DP.pdf 148 MB GASCO0051558.pdf 703 KB Tier4_2000977.pdf 18 MB GASCO0051523.pdf 673 KB 2023-01-20 - FW_ Gasco_ Weekly Water Levels; Koppers and LNG Basin Area_Redacted.pdf 249 KB Tier4_2002431.pdf 28 MB Anchor_A0G0765_Lvl_IV_DP.pdf 117 MB 2023-09-13 - LNG Foundation Support Pilings Ltr_09-13_2023.pdf 4 MB GASCO0049995.pdf 777 KB Anchor_A0C0030_Lvl_IV_DP.pdf 59 MB 2023-10-30 - Gasco OU_Ecological_COC-PRG Tables_Clean_2023-10-30.pdf 267 KB 2023-09-20 - FW_ DMR Compliance Review - NW Natural Gas Company (DEQ File 62231)_Redacted.pdf 174 KB dmrSubmission.pdf 34 KB 2023-07-14 - MAY2023CORRECTEDDMRSPREADSHEETLetter.pdf 155 KB Tier4_2001132.pdf 25 MB Anchor_A0A1010_Lvl_IV_DP.pdf 27 MB 2023-02-13 - Purge Water and Decontamination Residual Package 14.pdf 2 MB Anchor_A9J0463_Lvl_IV_DP.pdf 91 MB 2023-08-18 - FW_ NW Natural Former Koppers Basin Stormwater Pumping System Installation Report_Redacted.pdf 160 KB 2023-06-11 - 2023 Purge Water and Decontamination Residual Package 15.pdf 2 MB USMS0038171.pdf 672 KB Tier4_2000956.pdf 15 MB GASCO0049652.pdf 673 KB Tier4_2002157.pdf 50 MB 2023-04-10 - Portland Gas Prog Rpt 1Q-2023.pdf 200 KB Anchor_A0D0636_Lvl_IV_DP.pdf 82 MB Tier4_2001009 Revision 1.pdf 44 MB 2023-10-19 - Gasco FS Planning_Redacted.pdf 148 KB Anchor_A1E0219_Lvl_IV_DP.pdf 76 MB 2023-07-14 - June 2023 DMR and Second Quarter Eff Characterization.pdf 129 KB 2023-08-22 - T-50 Profile Cover Letter_082223.pdf 2 MB 2023-08-08 - PR 23-064841 SIGNED LUCS FORM (1).pdf 586 KB 20J0201 CLPLIKE (Rev0).PDF 87 MB K2104999.pdf 6 MB CPT and FFP 124-133 Combined.pdf 270 KB GASCO0054010.pdf 15 MB GASCO0048677.PDF 2 MB K2104780.pdf 12 MB USMS0029628.pdf 961 KB 2023-06-21 - 02_Gasco_monitoring waiver request_06.21.2023.pdf 831 KB 21E0089 CLPLIKE (Rev0).PDF 122 MB A0K0363 FINAL 01 18 21 0757 Anchor Gasco Siltronic.pdf 5 MB 2023-12-13 - FW_ [External]Portland Harbor Highly Toxic PTW Clarification_Redacted.pdf 215 KB 2023-10-30 - Gasco OU_Ecological_COC-PRG Tables_Redline_2023-10-30.pdf 272 KB Tier4_2000965.pdf 47 MB Tier4_2001034.pdf 23 MB 2023-06-15 - 2023-05 Gasco Prog Rpt.pdf 139 KB Anchor_A0E0310_Lvl_IV_DP.pdf 105 MB 2023-11-15 - 2023-10 Gasco Prog Rpt.pdf 89 KB 2023-02-09 - Request for No Longer Contained-In Determination_Redacted.pdf 203 KB GASCO0048830.pdf 37 MB 20K0192 CLPLIKE (Rev0).PDF 149 MB 2023-04-14 - First Quarter 2023 Characterization Monitoring Report Cover Letter.pdf 173 KB GASCO0052197.pdf 11 MB GASCO0051550.pdf 750 KB B1NC0008229.pdf 696 KB 2023-11-07 - RE_NW Natural_LNG Basin and Former Koppers Basin GW Eval_Fill WBZ Interceptor Trench.pdf 3 MB 2023-02-21 - DNAPL Data Gaps.pdf 94 MB Tier4_2001035.pdf 31 MB 2023-10-26 - FW_ Final PGM Year 3 Monitoring Report_Redacted.pdf 142 KB 21D0182 CLPLIKE (Rev0).PDF 27 MB December 2022-A2L0842 FINAL 01 17 23 0559 Sevenson Gasco -- Monthly (2022).pdf 1 MB Tier4_2000945.pdf 22 MB Anchor_A0A0538_Lvl_IV_DP.pdf 46 MB USMS0024409.pdf 183 MB 2023-01-16 - FW_ Effective Solubility Data Collection_Redacted.pdf 144 KB 2023-06-15 - May2023DMRCoverLetter.pdf 159 KB 2023-10-19 - Interim FS potential hot spot figures.pdf 3 MB FC1984 - A2I0864 FINAL 10 28 22 0608 Sevenson Gasco Filtercake.pdf 967 KB Tier4_1903430.pdf 16 MB GASCO0049835.pdf 707 KB 2023-05-31 - 01_FW_ Berthing Practices to Minimize Propwash Scour during Fleet Week 2023_Redacted.pdf 401 KB 2023-01-03 - Soil Testing Analytical Results and Apex Lab Report No. A2G0645.pdf 1 MB Anchor_A0D0648_Lvl_IV_DP.pdf 106 MB 20J0239 CLPLIKE (Rev0).PDF 89 MB Tier4_2000957.pdf 40 MB A1E0100 AMENDED FINAL 07 26 21 1220 Gasco Siltronic.pdf 4 MB 2023-08-24 - FW_ Siltronic response to DEQ comments on the SOU RI Data Summary Report_ DEQ Reply.pdf 736 KB GASCO0051635.pdf 861 KB Anchor_A1C0423_Lvl_IV_DP.pdf 107 MB GASCO0052476.pdf 902 KB GASCO0048683.pdf 5 MB Tier4_2001022.pdf 34 MB Tier4_2001133.pdf 23 MB Tier4_2001995.pdf 39 MB 2023-03-23 - 15th Amendment to Siltronic Access Agreement_signedTP.pdf 1 MB GASCO0049832.pdf 718 KB Anchor_A9J0599_Lvl_IV_DP.pdf 48 MB Anchor_A0E0314_Lvl_IV_DP.pdf 138 MB 21D0152 CLPLIKE (Rev0).PDF 51 MB Tier4_2002375.pdf 33 MB Tier4_1904210.pdf 83 MB Anchor_A0J0472_Lvl_IV_DP.pdf 56 MB USMS0038350.pdf 980 KB 2023-11-01 - 01_FW_ Request to transport and dispose of oil-water mixture currently staged at Gasco (NW Natural)_Redacted.pdf 185 KB Tier4_1903652.pdf 43 MB 2023-06-21 - 01_FW_ NW Natural Gasco Property - 1200-Z Total Iron Monitoring Waiver_Redacted.pdf 142 KB Anchor_A9J0360_Lvl_IV_DP.pdf 80 MB Anchor_A0A0539_Lvl_IV_DP.pdf 44 MB Tier4_1903740.pdf 35 MB GASCO0054099.pdf 39 MB 2023-07-13 - PGM Year 3 Figures_Table.pdf 15 MB USMS0029671.pdf 26 MB Tier4_2001510.pdf 24 MB 2023-08-15 - July Discharge Monitoring Report.pdf 133 KB 20K0069 CLPLIKE (Rev0).PDF 71 MB 2023-12-15 - FW_ Gasco OU Uplands FS - FS Data Gap Screening and Summary Statistic Tables_Redacted.pdf 248 KB USMS0038315 - 2023-06-19 - FW_ US Moorings Second Phase PDI - FCR Form No. 2_Redacted.pdf 631 KB 2023-07-20 - FW_ Gasco_ Weekly Water Levels_ Koppers and LNG Basin Area_Redacted.pdf 325 KB 20J0385 CLPLIKE (Rev0).PDF 64 MB Anchor_A0B0411_Lvl_IV_DP.pdf 30 MB Tier4_2104185.pdf 47 MB 2023-11-02 - FW_ Gasco OU Revised Source Control Addendum (1)_Redacted.pdf 238 KB K2105001.pdf 7 MB 2023-09-13 - FW_ Portland LNG Compressor Equipment Foundation Needs, Gasco_Redacted.pdf 132 KB GASCO0049989.PDF 1 MB 2023-01-13 - NWN Source Control Treatment Plant Monthly Effluent Sampling Report Data.pdf 97 KB 2023-07-17 - 2023 Purge and Decontamination Residual Package 16.pdf 1 MB 2023-11-06 - FW-_ Gasco OU FS PRGs - Final Ecological COC-PRG Tables for Review_Approval_Redacted.pdf 227 KB K2010728.pdf 25 MB Anchor_A9K0412_Lvl_IV_DP.pdf 37 MB L2161038.pdf 1 MB GASCO0051546.pdf 880 KB Tier4_1903648.pdf 23 MB Anchor_A0D0632_Lvl_IV_DP_A.pdf 133 MB USMS0038346 - 2023-06-29 - US Moorings 2023 PDI FCR Form 3_2023-06-29.pdf 673 KB 2023-05-23 - Application Notice for PGM - Department of State Lands.pdf 115 KB Anchor_A1E0206_Lvl_IV_DP.pdf 224 MB Anchor_A9J0353_Lvl_IV_DP.pdf 70 MB Anchor_A0F0670_Lvl_IV_DP.pdf 34 MB Anchor_A0A0712_Lvl_IV_DP.pdf 42 MB 2023-08-29 - 02_DEQ_NWP_401_WQC_Former Portland Gas Manufacturing (PGM) Long-Term Monitoring and Contingency Action Project 2009-20-6.pdf 574 KB Anchor_A0C0024_Lvl_IV_DP.pdf 66 MB GASCO0050105.pdf 26 MB GASCO0052480.pdf 782 KB Anchor_A1E0079_Lvl_IV_DP.pdf 211 MB BF144 - A2I0874 FINAL 10 28 22 0544 Sevenson Gasco Filter Bags 111323.pdf 932 KB GASCO0054007.pdf 627 KB Tier4_1903546.pdf 18 MB GASCO0052469.pdf 924 KB Tier4_2000976.pdf 16 MB K2103235.pdf 15 MB BF143 - A2H0782 FINAL 09 08 22 0821 Sevenson Gasco Filter Bags 111323.pdf 894 KB GASCO0054348.pdf 682 KB K2010412.pdf 19 MB 2023-01-09 - Portland Gas Prog Rpt 4Q-2022.pdf 198 KB GASCO0052849.pdf 1 MB Results 052521.pdf 341 KB GASCO0049855.pdf 659 KB 2023-04-10 - FW_ Gasco OU - Human Health TPH PRG Tables and TPH RBC Workbooks for Review_Redacted.pdf 114 KB GASCO0051540.pdf 880 KB GASCO0055957.pdf 1 MB GASCO0054071.pdf 3 MB GASCO0051589.pdf 627 KB 21E0006 CLPLIKE (Rev2).PDF 216 MB GASCO0051562.pdf 1 MB Anchor_A0J0343_Lvl_IV_DP.pdf 22 MB GASCO0049443.pdf 712 KB USMS0038344 - 2023-06-24 - FW_ US Moorings Project Area Phase 2 Pre-Design Investigation Daily Progress Report, June 23, 2023_Redacted.pdf 672 KB Anchor_A0A0637_Lvl_IV_DP.pdf 33 MB K2010407.pdf 20 MB 2023-11-15 - OCT2023CoverLetter (NetDMR Submittal).pdf 145 KB USMS0038136.pdf 9 MB A9I0879_Lvl_IV_DP_A.pdf 44 MB 2023-06-20 - FW_ Gasco_ Weekly Water Levels; Koppers and LNG Basin Area_Redacted.pdf 243 KB Tier4_2000998.pdf 16 MB 2023-12-04 - FW_ Gasco OU Upland Feasibility Study_Redacted.pdf 178 KB 2023-02-28 - 01_FW_ Gasco_ HC&C Operational Figures July through December 2022_Redacted and attached Figures_Redacted.pdf 372 MB GASCO0053798.pdf 912 KB 2023-10-20 - FW_ Gasco_ Weekly Water Levels; Koppers and LNG Basin Area_Redacted.pdf 242 KB L2206076_ddpr01.pdf 16 MB A9J0530_Lvl_IV_DP.pdf 111 MB Anchor_A9J1007_Lvl_IV_DP.pdf 68 MB 2023-10-06 - FW_ Draft PGM Year 3 Monitoring Report_Redacted.pdf 194 KB 21C0175 CLPLIKE (Rev0).PDF 46 MB GASCO0049467.pdf 2 MB 2023-07-13 - FW_ Gasco_ DNAPL Mobility Meeting follow-up_Redacted.pdf 441 KB Anchor_A0F0251_Lvl_IV_DP.pdf 84 MB 2023-08-24 - PH Data Management Plan and Summary of Parent-Field Duplicate Averaging Methods_Redacted.pdf 102 KB 2023-06-21 - Gasco LNG-Koppers Basin_Q2-Q4_2022_2023-06-21.pdf 43 MB K2104993.pdf 9 MB K2010405.pdf 12 MB 2023-02-06 - Gasco OU_ 2021 Hydraulic Control and Containment System Annual Report_Redacted.pdf 220 KB 21C0277 ARISample FINAL 16 Apr 2021 1253.pdf 2 MB USMS0024010.pdf 68 MB Anchor_A0C0034_Lvl_IV_DP.pdf 43 MB USMS0038336 - 2023-06-21 - FW_ US Moorings Project Area Phase 2 Pre-Design Investigation Daily Progress Report, June 20, 2023_Redacted.pdf 672 KB GASCO0051554.pdf 732 KB USMS0038169.pdf 672 KB USMS0038306 - 2023-06-19 - FW_ US Moorings First Phase Pre-Design Investigation DSR and Second Phase PDIWP_Redacted (2).pdf 1 MB 2023-07-03 - FW_ Details of Ecological Soil RBC_PRG Information Requested_Redacted.pdf 100 KB K2104778.pdf 14 MB No 4 CP 2020-03-26_I-II.pdf 157 KB GASCO0049637.pdf 776 KB 2023-03-15 - Gasco-Revised ISS TSWP_DEQ Comments.pdf 400 KB Report 2-25-2020.pdf 733 KB K2010401.pdf 3 MB GASCO0049870.pdf 9 MB 2023-05-22 - FW_ Gasco OU - Ecological Soil COC and PRG Tables PRG Tables for Review_Redacted.pdf 180 KB Anchor_A0E0668_Lvl_IV_DP.pdf 44 MB GASCO0056170.pdf 425 MB USMS0032304.pdf 1 MB GASCO0055220.pdf 769 KB 2023-11-01 - 03_NWN Gasco 1200-Z Q1_2023-24 DMR.pdf 858 KB GASCO0054049.pdf 1 MB 2023-07-07 - FW_ Gasco_ DNAPL Mobility Meeting follow-up_Redacted.pdf 305 KB Tier4_2000962.pdf 25 MB Tier4_2103100.pdf 26 MB GTX_312774_Results 020221 Revised.pdf 661 KB 2023-04-22 - FW_ 64379-PW application review_Redacted.pdf 274 KB Tier4_2000961.pdf 16 MB USMS0024331.pdf 14 MB 2023-02-07 - 23-02-07 Inspection Letter.pdf 280 KB Anchor_A0D0205_Lvl_IV_DP.pdf 37 MB Anchor_A0I0556_Lvl_IV_DP.pdf 54 MB 240588-NWN-2023-ECRM-Exh C-07-15-24.pdf 3 MB 2023-03-15 - February2023DMRCoverLetter.pdf 164 KB Anchor_A9J0594_Lvl_IV_DP.pdf 92 MB Anchor_A0A0996_Lvl_IV_DP.pdf 43 MB 2023-05-15 - April2023DMRCoverLetter.pdf 165 KB Anchor_A0D0553_A_Lvl_IV_DP.pdf 153 MB 2023-07-19 - FW_ Gasco OU Upland FS Schedule_Redacted.pdf 149 KB Tier4_2000195.pdf 29 MB GASCO0054047.pdf 628 KB K2102811.pdf 10 MB A0K0482 AMENDED FINAL 09 09 21 0654 Anchor Gasco Siltronic.pdf 3 MB Anchor_A0F0117_Lvl_IV_DP.pdf 91 MB Tier4_2002159.pdf 97 MB 2023-03-02 - PGM_Year 2 Monitoring Report_2023-03-02.pdf 49 MB 2023-10-06_1138_DEQ Approval PGM Year 3 Report.pdf 246 KB 2023-11-13 - DEQ_NLCI Letter 11-13-2023.pdf 1 MB USMS0038357.pdf 684 KB Tier4_2000329.pdf 19 MB Anchor_A0A0716_Lvl_IV_DP.pdf 47 MB GASCO0051638.pdf 56 MB 2023-02-06 - 2021 HCC System Annual Report_RTC Matrix_2023-02-06.pdf 159 KB 2023-10-13 - Sept2023DMRCoverLetter.pdf 162 KB GASCO0049455.pdf 1 MB 21E0017 CLPLIKE (Rev1).PDF 133 MB USMS0038342 - 2023-06-23 - FW_ US Moorings Project Area Phase 2 Pre-Design Investigation Daily Progress Report, June 22, 2023_Redacted.pdf 672 KB GASCO0053961.pdf 675 KB Tier4_2104305.pdf 25 MB GASCO0051560.pdf 688 KB 2023-07-25 - Gasco OU FS Schedule (conditional approval).pdf 326 KB 2023-12-18 - FW_ Gasco OU Uplands FS - FS Data Gap Screening and Summary Statistic Tables_Redacted.pdf 159 KB Anchor_A0C0026_Lvl_IV_DP.pdf 33 MB Tier4_2001039.pdf 40 MB GASCO0049822.pdf 670 KB GASCO0049863.pdf 661 KB 20J0121 CLPLIKE (Rev0).PDF 67 MB 2023-05-23 - FW_ Gasco_ DNAPL Mobility Meeting follow-up_Redacted.pdf 240 KB GASCO0052468.pdf 675 KB GASCO0066827.pdf 94 MB Tier4_1904208 Revision 1.pdf 84 MB USMS0021764.pdf 816 KB GASCO0049859.pdf 659 KB Anchor_A0D0196_Lvl_IV_DP.pdf 34 MB 20J0203 CLPLIKE (Rev0).PDF 123 MB 2023-07-28 - FW_ Gasco OU_ 2022 Hydraulic Control and Containment System Annual Report_Redacted.pdf 309 KB L1944688_ddpr01.pdf 7 MB 2023-03-31- DNAPL Monitoring Summary Report.zip 21 MB USMS0029581 - Appendix H_Second Phase PDI QAPP - Att A_Lab SOPs & QA Manuals.zip 28 MB 2023-05-15 - April 2023 Discharge Monitoring Report.pdf 114 KB 2023-05-04 - FW_ Gasco_ DNAPL Mobility Meeting follow-up_Redacted.pdf 191 KB Anchor_A0E0138_Lvl_IV_DP.pdf 94 MB 21E0106 CLPLIKE (Rev0).PDF 53 MB Tier4_2001037.pdf 46 MB Anchor_A0B0288_Lvl_IV_DP.pdf 29 MB Anchor_A9J0096_Lvl_IV_DP.pdf 70 MB 2023-12-08 - FW_ Gasco_ Groundwater Quality Database through the 2023 Annual Event_Redacted.pdf 161 KB Tier4_2104002.pdf 92 MB Tier4_2001110.pdf 46 MB GASCO0067444.pdf 7 MB Anchor_A0A0994_Lvl_IV_DP.pdf 35 MB GTX310685-Final-Report-11202019.pdf 13 MB 2023-01-16 - 2022-12 Gasco Prog Rpt.pdf 142 KB Anchor_A0J1068_Lvl_IV_DP_A.pdf 151 MB Anchor_A9J1006_Lvl_IV_DP.pdf 73 MB A9I0922_Lvl_IV_DP.pdf 54 MB BF147 - A3A0118 FINAL 01 17 23 0625 Sevenson Gasco Filter Bags 11323.pdf 895 KB Tier4_2000948 Revision 1.pdf 46 MB Tier4_2000407.pdf 35 MB GASCO0049827.pdf 705 KB Anchor_A9K0165_Lvl_IV_DP.pdf 26 MB 2023-01-11 - NWN_1200z_MonitoringWavierRequest.pdf 2 MB 20K0075 CLPLIKE (Rev0).PDF 83 MB Tier4_2000927.pdf 64 MB GASCO0054273.pdf 8 MB Tier4_2000953.pdf 28 MB GASCO0054199.pdf 696 KB A9J0063_Lvl_IV_DP.pdf 92 MB Anchor_A0E0669_Lvl_IV_DP.pdf 63 MB 2023-05-01 - Certificate of Liability Insurance State of Oregon - 61743-RAEA.pdf 354 KB GASCO0053953.pdf 659 KB 2023-08-17 - Monitoring Waiver Approval.pdf 364 KB Anchor_A0C0715_Lvl_IV_DP.pdf 22 MB 2023-02-02 - (PFAS Letter EPA Memo) NPDES_PFAS_State Memo_December_2022.pdf 315 KB 2023-10-26 - PW-6U Well Replacement Design DEQ Reply_Redacted.pdf 187 KB GASCO0054087.pdf 691 KB A9J0690_Lvl_IV_DP.pdf 81 MB Anchor_A9K0332_Lvl_IV_DP.pdf 92 MB GASCO0067512.pdf 764 KB 2023-10-02 - FW_ Gasco Site_ DNAPL Monitoring Semiannual Summary Report January 1 through June 30, 2023_Redacted.pdf 201 KB Tier4_2105023.pdf 41 MB 2023-07-17 - 2023-06 Gasco Prog Rpt.pdf 76 KB GASCO0051501.pdf 731 KB GASCO0054008.pdf 682 KB Anchor_A0G0267_Lvl_IV_DP.pdf 85 MB GASCO0053833.pdf 902 KB Tier4_1904016.pdf 43 MB 2023-10-09 - 02_3Q23 No Discharge_Gasco_500.022.pdf 282 KB 2023-11-21 - 2023 Filter Press Cake Profile 115116OR Renewal.pdf 10 MB FC2000 - A2J0597 FINAL 12 02 22 1255 Sevenson Gasco Filtercake 111323.pdf 970 KB Anchor_A9J0903_Lvl_IV_DP.pdf 65 MB Tier4_2000967.pdf 41 MB Anchor_A0D0764_Lvl_IV_DP.pdf 83 MB 2023-04-26 - 01_FW_ PGM_ SDU-averaged bathymetric difference measurements (1)_Redacted.pdf 155 KB Anchor_A9J0950_Lvl_IV_DP.pdf 67 MB Tier4_2000960.pdf 14 MB GASCO0049861.pdf 659 KB 2023-01-13 - 4Q22 No Discharge_Gasco_500.022.pdf 311 KB 2023-06-15 - May 2023 DMR.pdf 132 KB USMS0038184 - 2023-06-16 - Appendix G_PDI FSP_2023-06-15.pdf 4 MB Tier4_2103219.pdf 50 MB 2023-05-05 - FW_ NWN PGM site easement application 61743-RAEA - Certificates of Insurance_Redacted.pdf 128 KB 2023-09-15 - 2023-08 Gasco Prog Rpt.pdf 84 KB Anchor_A1E0180_Lvl_IV_DP.pdf 190 MB L2020213_ddpr01.pdf 19 MB Anchor_A0G0825_Lvl_IV_DP.pdf 94 MB EGL Paint Filter SOP.pdf 198 KB Anchor_A0J0298_Lvl_IV_DP.pdf 9 MB GASCO0053769.pdf 742 KB 2023-04-26 - NWN Gasco 1200-Z DMR Q3_2022-23 Cover Letter.pdf 221 KB 20J0202 CLPLIKE (Rev0).PDF 91 MB GASCO0049820.pdf 686 KB GASCO0053788.pdf 1 MB GASCO0051521.pdf 674 KB 2023-09-28 - Portland LNG Compressor Equipment Foundation Needs, Gasco_Redacted.pdf 150 KB Results 041221.pdf 147 KB Tier4_1904159.pdf 55 MB 2023-12-15 - NovemberDMRCoverLetter.pdf 163 KB Tier4_2000952.pdf 29 MB Tier4_2105020.pdf 19 MB K2010068.pdf 16 MB USMS0038173.PDF 699 KB Anchor_A1D0450_Lvl_IV_DP.pdf 32 MB Anchor_A0A0633_Lvl_IV_DP.pdf 29 MB Anchor_A0D0741_Lvl_IV_DP.pdf 48 MB GASCO0055966.pdf 812 KB Anchor_A0K0578_Lvl_IV_DP.pdf 187 MB 2023-04-17 - 2023-03 Gasco Prog Rpt.pdf 143 KB 2023-10-16 - 2023-09 Gasco Prog Rpt.pdf 76 KB 2023-05-04 - DNAPL Mobility Follow-up Meeting Materials.pdf 9 MB 2023-02-21 - FW_ Gasco Upland FS DNAPL Data Gaps Investigation Data Package_Redacted.pdf 137 KB 240588-NWN-2023-ECRM-Rpt-07-15-24.pdf 258 KB 19J0011 CLPLIKE (Rev0).PDF 8 MB 21C0277 CLPLIKE (Rev0).PDF 65 MB Anchor_A0C0029_Lvl_IV_DP.pdf 32 MB Anchor_A0K0255_Lvl_IV_DP.pdf 202 MB GASCO0052464.pdf 999 KB GASCO0052189.pdf 667 KB Tier4_1903739.pdf 17 MB 2023-09-29 - DNAPL Monitoring Summary 1st Half 2023_Tagged.pdf 11 MB 2023-01-13 - December2022DMRCoverLetter.pdf 166 KB 2023-03-31 - FW_ Gasco Site_ DNAPL Monitoring Semiannual Summary Report July 1 through December 31, 2022_Redacted.pdf 203 KB Anchor_A0D0694_Lvl_IV_DP.pdf 90 MB USMS0038334 - 2023-06-20 - FW_ US Moorings Project Area Phase 2 Pre-Design Investigation Daily Progress Report, June 19, 2023 _Redacted.pdf 672 KB GASCO0054185.pdf 638 KB 2023-04-21 - APP0064379-Revised Application-4_21_2023 (PGM).pdf 6 MB 2023-06-16 - PGM_Year 2 Monitoring Report_2023-06-16.pdf 40 MB USMS0037477.pdf 41 MB 2023-03-10 - FW_ Gasco OU - Human Health COC and PRG Tables and RBDM_RBC Workbooks for Review_Redacted.pdf 102 KB FC1952 - A2G0558 FINAL 08 25 22 0848 Sevenson Gasco Filtercake 111323.pdf 968 KB 2023-02-16 - DEQ Response RE Proposed Groundwater Monitoring Program Modification_Redacted.pdf 224 KB GASCO0053971.pdf 648 KB GASCO0055334.pdf 715 KB 2023-11-03 - FW_ Gasco OU FS PRGs - Final Ecological COC-PRG Tables for Review_Approval_Redacted.pdf 217 KB 21F0303 CLPLIKE (Rev0).PDF 15 MB 2023-07-14 - CorrectedMay2023DMR-Final.pdf 96 KB 2023-01-25 - 23-01-25 Monitoring Waiver Partial Approval.pdf 172 KB Tier4_2002493.pdf 28 MB Tier4_2002173.pdf 85 MB GASCO0067407.pdf 11 MB 21C0244 CLPLIKE (Rev0).PDF 71 MB Tier4_1903736.pdf 52 MB GASCO0053450.pdf 1 MB 2023-02-01 - PGM Year 2 Mon Report_DEQ Comments_020123.pdf 334 KB 2023-08-02 - FW_ NW Natural Proposal for a Completeness Check for Potential Cross-Media COCs in the Gasco OU FS_Redacted.pdf 189 KB 2023-08-25 - Tables 1 and 2_Eco Surface Soil COCs & PRGs_2023-08-24.pdf 131 KB 240588-NWN-2023-ECRM-Exh B-07-15-24.pdf 1 MB 2023-02-06 - FW_ PW-10U Replacement Well_Redacted.pdf 139 KB Anchor_A9K0039_Lvl_IV_DP.pdf 22 MB GASCO0054189.pdf 660 KB GASCO0051513.PDF 812 KB 2023-10-19 - 01_FW_ Gasco PW-6U Replacement Well Design_Redacted.pdf 122 KB Anchor_A0A0539_Lvl_IV_DP_A.pdf 43 MB 2023-07-14 - Lf_Response to DEQ Comments on SOU Data Summary Report.pdf 11 MB 2023-07-11 - 2Q23 No Discharge_Gasco_500.022.pdf 454 KB GASCO0054431.pdf 862 KB GASCO0051542.pdf 879 KB Tier4_2000999.pdf 25 MB Anchor_A1E0174_Lvl_IV_DP.pdf 96 MB Anchor_A9J0553_Lvl_IV_DP.pdf 109 MB USMS0029665.pdf 863 KB 2023-10-19 - Interim FS potential hot spots and RAOs.pdf 139 KB 2023-09-12 - FS Modeling Meeting_DEQ Meeting_2023-09-12.pdf 10 MB Anchor_A9J0841_Lvl_IV_DP.pdf 126 MB GASCO0048820.PDF 2 MB A9J0479_Lvl_IV_DP.pdf 137 MB USMS0032305.pdf 183 MB A9J0417_Lvl_IV_DP.pdf 132 MB Anchor_A0K0482_Lvl_IV_DP.pdf 60 MB GASCO0051509.pdf 672 KB GASCO0067517.pdf 1 MB 2023-11-20 - FW_ Gasco_ Weekly Water Levels; Koppers and LNG Basin Area_Redacted.pdf 242 KB USMS0021775.pdf 666 KB GASCO0049658.pdf 659 KB GASCO0051511.pdf 673 KB Anchor_A0D0210_Lvl_IV_DP.pdf 33 MB Tier4_2002532.pdf 26 MB GASCO0054460.pdf 1 MB Anchor_A9J0959_Lvl_IV_DP.pdf 53 MB 2023-03-01 - FW_ Effective Solubility Data Collection_Redacted and attachments.pdf 2 MB GTX310685-Report-11262019.pdf 2 MB Tier4_1903460.pdf 13 MB Tier4_1903741.pdf 17 MB October 2022-A2J0589 FINAL 12 02 22 1241 Sevenson Gasco -- Monthly (2022).pdf 1 MB K2010456.pdf 26 MB 2023-04-14 - March 2023 DMR Submission.pdf 124 KB 2023-09-20 - 23-02-15 DMR & Labs_Revised.pdf 4 MB 2023-07-18 - FW_ PGM Year 3 Bathymetry Results_Redacted.pdf 477 KB Anchor_A0E0132_Lvl_IV_DP.pdf 88 MB Tier4_1903738.pdf 38 MB K2010308.pdf 21 MB Anchor_A9K0330_Lvl_IV_DP.pdf 36 MB Tier4_1903285 Revision 1.pdf 77 MB 2023-03-15 - 2023-02 Gasco Prog Rpt.pdf 141 KB Tier4_2002432.pdf 32 MB Anchor_A0E0265_Lvl_IV_DP.pdf 108 MB GASCO0054091.pdf 706 KB 2023-10-30 - FW_ Gasco OU FS PRGs - Final Ecological COC-PRG Tables for Review_Approval_Redacted.pdf 222 KB B1NC0008209.pdf 909 KB Anchor_A9J0718_Lvl_IV_DP.pdf 36 MB 21E0098 CLPLIKE (Rev0).PDF 140 MB GASCO0052844.pdf 754 KB 2023-09-26 - FW_ Gasco OU FS PRGs - Riverbank COC_PRG Tables 5a and 5b_Redacted.pdf 211 KB A0K0167 AMENDED FINAL 08 16 21 1242 Anchor Gasco Siltronic.pdf 5 MB Anchor_A0K0224_Lvl_IV_DP.pdf 205 MB 20K0168 CLPLIKE (Rev0).PDF 87 MB GASCO0054061.pdf 696 KB 20J0215 CLPLIKE (Rev0).PDF 86 MB GASCO0051548.pdf 692 KB Anchor_A0F0667_Lvl_IV_DP.pdf 36 MB USMS0038359.PDF 702 KB Anchor_A0L0210_Lvl_IV_DP.pdf 32 MB Anchor_A1E0225_Lvl_IV_DP.pdf 173 MB 2023-03-31 - FW_ Draft Final PGM Year 2 Monitoring Report - for your review_Redacted.pdf 632 KB Anchor_A0J0993_Lvl_IV_DP.pdf 12 MB USMS0037421.pdf 2 MB 2023-03-10 - HH PRG Meeting Tables_2023-03-10.pdf 479 KB Anchor_A0E0670_Lvl_IV_DP.pdf 25 MB Tier4_2002006.pdf 29 MB Anchor_A0D0763_A_Lvl_IV_DP.pdf 75 MB 2023-02-24 - Annual Flow Meter and Outfall Inspections.pdf 3 MB Anchor_A0C0036_Lvl_IV_DP.pdf 40 MB Tier4_2000996.pdf 38 MB 2023-02-15 - 2023-01 Gasco Prog Rpt.pdf 133 KB 2023-08-31 - Gasco_ HC&C Operational Figures January through June 2023_Redacted.pdf 294 KB GASCO0049829.pdf 660 KB Tier4_2000787.pdf 33 MB Anchor_A0K0477_Lvl_IV_DP.pdf 166 MB Tier4_2001005.pdf 32 MB Tier4_2002492.pdf 26 MB 2023-02-06 - PW-10U Replacement Well Reference Documents.pdf 4 MB Anchor_A9J0558_Lvl_IV_DP.pdf 88 MB 2023-05-15 - 2023-04 Gasco Prog Rpt.pdf 105 KB 2023-02-13 - Gasco-Feasibility Study Data Gaps Work Plan_DEQ Conditional Approval.pdf 322 KB Tier4_1903647.pdf 23 MB 2023-09-21 - FW_ Gasco OU FS PRGs - Riverbank COC_PRG Tables 5a and 5b_Redacted.pdf 121 KB FC2033 - A3A0116 FINAL 01 17 23 0613 Sevenson Gasco Filtercake.pdf 907 KB Tier4_2000975.pdf 15 MB Tier4_2103150.pdf 60 MB GASCO0066761.pdf 5 MB Tier4_2105042.pdf 32 MB 2023-08-14 - 1st and 2nd QTR Bag Filter APEX Lab Report.zip 5 MB Anchor_A2A1041_Lvl_IV_DP.pdf 46 MB 2023-12-05 - Gasco Request for No Longer Contained-In Determination_Redacted.pdf 763 KB USMS0029592.pdf 947 KB K2102462.pdf 12 MB 2023-09-15 - DMR Submission.pdf 133 KB BF146 - A2K0621 FINAL 12 03 22 1302 Sevenson Gasco Filter Bags 111323.pdf 950 KB Tier4_2103216.pdf 65 MB 2023-10-26 - PGM_Year 3 Monitoring Report_2023-10-26.pdf 13 MB 2023-02-02 - Liquid Phase Carbon (Solids Residuals) Disposal Package.pdf 8 MB Anchor_A9K0695_Lvl_IV_DP.pdf 39 MB GASCO0051535.pdf 717 KB 240588-NWN-2023-ECRM-Trf Sheet-07-15-24.pdf 2 MB Anchor_A0A0638_Lvl_IV_DP.pdf 37 MB 2023-09-15 - Aug2023DMRcoverletter.pdf 161 KB 2023-02-28 - DSL Easement Application PGM.pdf 34 MB 2023-03-16 - Doane Creek Source Control Outfall 22C Sampling Program request to revise storm criteria for sw sampling_Redacted.pdf 100 KB September 2022-A2I0865 FINAL 10 28 22 0553 Gasco Monthly (2022) 000029-02-20-2.pdf 1 MB Tier4_1903651_Revision 1.pdf 13 MB GASCO0067529.pdf 2 MB Anchor_A9J0033_Lvl_IV_DP.pdf 64 MB Anchor_A9J0095_Lvl_IV_DP.pdf 47 MB Tier4_2000855 Revision 1.pdf 26 MB B1NC0008231.pdf 696 KB Tier4_2001154.pdf 22 MB 2023-12-15 - November 2023 DMR Submission.pdf 127 KB K2010309.pdf 29 MB 2023-11-29 - 64753AA Authorization.pdf 7 MB 2023-12-15 - December 2023_NW Natural_Navigation Channel_Quarterly Progress Report.pdf 161 KB Anchor_A0B0061_Lvl_IV_DP_AQrev_050420.pdf 81 MB 2023-04-13 - 1Q23 No Discharge_Gasco_500.022.pdf 266 KB GASCO0054056.pdf 892 KB Anchor_A9K0421_Lvl_IV_DP.pdf 108 MB USMS0038175 - 2023-06-16 - FW_ US Moorings First Phase Pre-Design Investigation DSR and Second Phase PDIWP_Redacted (1).pdf 2 MB 2023-05-01 - cert_SEA_State of Oregon Department of_3366104_43 (002).pdf 43 KB USMS0038250 - 2023-06-16 - Appendix H_PDI QAPP_2023-06-15.pdf 2 MB A9J0562_Lvl_IV_DP.pdf 102 MB Tier4_2000950.pdf 35 MB GASCO0052508.pdf 9 MB GASCO0051025.pdf 57 MB Tier4_2105022.pdf 18 MB Anchor_A0A1002_Lvl_IV_DP.pdf 28 MB A9J0507_Lvl_IV_DP.pdf 165 MB GASCO0054093.pdf 668 KB 2023-07-14 - 2ndQuarter2023TransmittalLetter.pdf 178 KB 2023-07-17 - FW_ Gasco OU - Human Health COC and PRG Tables and RBDM_RBC Workbooks for Review_Redacted.pdf 220 KB Anchor_A0D0677_Lvl_IV_DP.pdf 202 MB 2023-08-03 - FW_ Doane Creek Outfall 22C Data Export as Requested_Redacted.pdf 166 KB K2104776.pdf 6 MB 2023-08-10 - DNAPL Delineation and Sensitivity Analysis_2023-08-10.pdf 4 MB USMS0031876.pdf 12 MB Tier4_2000964.pdf 31 MB Anchor_A0A0718_Lvl_IV_DP_Amended.pdf 48 MB Anchor_A0D0056_Lvl_IV_DP.pdf 41 MB 2023-07-27_Gasco-LNG-Koppers-Basin-Q2-Q4-2022_DEQ Comments.pdf 322 KB Anchor_A0J0371_Lvl_IV_DP_A.pdf 30 MB K2010727.pdf 11 MB USMS0038338 - 2023-06-20 - FW_ US Moorings Second Phase PDI - FCR Form No. 2 (Approval)_Redacted.pdf 617 KB 2023-08-14 - 1st and 2nd QTR Filter Cake APEX Lab Reports.zip 5 MB 2023-12-20 - FW_ Gasco_ Weekly Water Levels; Koppers and LNG Basin Area_Redacted.pdf 229 KB 2023-04-06 - Data Gaps_IDW Letter_Attachments_signed.pdf 5 MB 2023-08-24 - RTCs on Siltronic OU RI Data Summary Report Comments_DEQ Reply.pdf 453 KB Tier4_1903461.pdf 37 MB 2023-04-26 - NWN Gasco 1200-Z DMR Q3_2022-23.pdf 3 MB 21E0099 CLPLIKE (Rev1).PDF 32 MB 2023-07-19 - Gasco Upland FS Schedule_2023-07-19.pdf 532 KB Tier4_2000933.pdf 74 MB 2023-11-30 - 23-11-30 Inspection Letter.pdf 431 KB 2023-08-15 - July2023DMRCoverLetter.pdf 145 KB GASCO0049853.pdf 673 KB 2023-08-14 - FW_ Siltronic response to DEQ comments on the SOU RI Data Summary Report_Redacted.pdf 181 KB Tier4_2001155.pdf 24 MB GASCO0049825.pdf 686 KB 20K0073 CLPLIKE (Rev0).PDF 73 MB Anchor_A0E0264_Lvl_IV_DP.pdf 149 MB GASCO0053959.pdf 694 KB Anchor_A0J0281_Lvl_IV_DP.pdf 37 MB GASCO0049654.pdf 707 KB GASCO0049839.pdf 660 KB 2023-09-21 - PGM_Year 3 Monitoring Report_2023-09-21.pdf 20 MB 2023-05-18 - FW_ PGM Year 2 Monitoring Report - final redlines for your review_Redacted.pdf 909 KB GASCO0055343.pdf 26 MB 19K0394 CLPLIKE (Rev0).PDF 17 MB GASCO0054350.pdf 9 MB 2023-04-14 - March 2023 DMR Cover Letter.pdf 161 KB Anchor_A0A0991_Lvl_IV_DP.pdf 46 MB 2023-10-31 - T-50 Profile Cover Letter_Tradebe_103123_signed.pdf 2 MB Tier4_1903743.pdf 6 MB GASCO0053955.pdf 659 KB 2023-10-25 - PW-6U Well Replacement Design_Redacted.pdf 186 KB Tier4_2002434.pdf 30 MB Anchor_A0J0995_Lvl_IV_DP_A.pdf 129 MB GASCO0051590.pdf 2 MB Anchor_A9J0514_Lvl_IV_DP.pdf 80 MB 2023-11-29 - FW_ 64753-AA Authorized Short Term Access Agreement document attached_Redacted.pdf 97 KB GASCO0067351.pdf 738 KB 20K0191 CLPLIKE (Rev1).PDF 181 MB 2023-02-20 - FW_ Gasco_ Weekly Water Levels; Koppers and LNG Basin Area_Redacted.pdf 230 KB 2023-03-16 - FW_ Effective Solubility Data Collection_Redacted.pdf 186 KB Anchor_A9K0692_Lvl_IV_DP.pdf 131 MB GASCO0048818.pdf 720 KB GASCO0053772.pdf 3 MB GASCO0049848.pdf 760 KB 2023-02-27_2021 HCC System Annual Report_RTC Matrix_DEQ Replies.pdf 192 KB Anchor_A9J0861_Lvl_IV_DP.pdf 57 MB Tier4_1903645.pdf 9 MB K2010403.pdf 9 MB USMS0038087.pdf 955 KB USMS0037355.pdf 4 MB 20K0285 CLPLIKE (Rev0).PDF 74 MB 2023-12-15 - December 2023_NW Natural_US Moorings_Quarterly Progress Report.pdf 163 KB 2023-04-26 - FW_ PGM_ SDU-averaged bathymetric difference measurements_Redacted.pdf 253 KB GASCO0054085.pdf 688 KB 2023-01-25 - FW_ Gasco OU Draft Feasibility Study Comprehensive Data Gaps Work Plan_Redacted.pdf 183 KB Anchor_A0D0782_Lvl_IV_DP.pdf 12 MB 2023-03-02 - PGM_Year 2 Monitoring Report_Redline_2023-03-02.pdf 16 MB 2023-02-15 - January 2023 Discharge Monitoring Report.pdf 128 KB 2023-11-13 - FW_ Gasco_ Request for No Longer Contained-In Determination_Redacted.pdf 248 KB USMS0032255.pdf 39 MB USMS0029459.pdf 4 MB 2023-12-08 - FW_ Request to transport and dispose of soil and well construction material_Redacted.pdf 112 KB 2023-08-29 - 01_Cover Email DEQ 401 WQC for Former Portland Gas Manufacturing (PGM) Long-Term Monitoring_Redacted.pdf 562 KB Anchor_A1D0627_Lvl_IV_DP.pdf 36 MB Anchor_A1D1195_Lvl_IV_DP.pdf 142 MB 2023-05-22 - Signed-2023-05-22 Purge Water and Decontamination Tank Residuals Disposal Request Cover Letter (002).pdf 107 KB GASCO0049663.pdf 6 MB 2023-11-03_Gasco OU_Ecological_COC-PRG Tables_DEQ Comments.pdf 319 KB 2023-01-23 - NW Natural Source Control Groundwater Treatment Facility - Spent Bag Filters Disposal Package.pdf 14 MB A9I0885_Lvl_IV_DP_A.pdf 36 MB 2023-09-20 - 23-08-15 DMR & Labs_Revised.pdf 7 MB Tier4_2104131.pdf 47 MB Tier4_1903419 Revision 1.pdf 34 MB Anchor_A9I0890_Lvl_IV_DP.pdf 45 MB Tier4_1903654.pdf 50 MB Tier4_2002003.pdf 17 MB K2104735.pdf 19 MB 2023-05-31 - 02_PGM_Yr2WPA_April-2022 to June-2022 Isopach.pdf 2 MB Tier4_2105037.pdf 11 MB Anchor_A0D0729_Lvl_IV_DP.pdf 83 MB GASCO0053969.pdf 662 KB Tier4_2002298.pdf 11 MB Tier4_1903742.pdf 20 MB 2023-04-14 - Gasco_ DNAPL Mobility Meeting follow-up_Redacted.pdf 98 KB 2023-02-09 - Gasco OU-IDW-No Longer Contained In Memo.pdf 320 KB 2023-05-18 - PGM_Year 2 Monitoring Report_Redline_2023-05-18.pdf 761 KB Sevenson_A0H0330_Lvl_IV_DP.pdf 8 MB GASCO0055336.pdf 2 MB 2023-08-08 - FW_ _External_Signed LUCS form for PR 23-064841 LUCS_Redacted.pdf 152 KB GASCO0053811.pdf 1 MB GASCO0052474.pdf 712 KB Anchor_A0D0659_Lvl_IV_DP.pdf 31 MB 2023-02-07 - Proposed GW Monitoring Program.pdf 2 MB Anchor_A0E0312_Lvl_IV_DP.pdf 26 MB A9I0877_Lvl_IV_DP_A.pdf 16 MB Tier4_2001156.pdf 16 MB Tier4_2002549.pdf 61 MB Tier4_1903420.pdf 16 MB 2023-08-24 - PH_Program-DMP_Final_20211008.pdf 6 MB GASCO0050697.pdf 880 KB Anchor_A0B0681_Lvl_IV_DP.pdf 51 MB 2023-08-14 - 1st and 2nd Quarter Residual Lab Data Soft Copy Lab Package Submittal.pdf 766 KB Riverbank Stabilization Data Sheets.pdf 75 KB USMS0038077.pdf 10 MB FC1968 - A2H0778 FINAL 09 08 22 0746 Sevenson Gasco -- Filtercake.pdf 894 KB Tier4_2000440.pdf 20 MB GASCO0054210.pdf 32 MB GASCO0067524.pdf 831 KB USMS0029640.pdf 10 MB GASCO0066712.pdf 1 MB Tier4_2002132.pdf 27 MB 2023-03-20 - RE_Doane Creek SC Outfall 22C Sampling Program Req. to revise criteria for stormwater sampling_Redacted.pdf 156 KB 2023-12-15 - 2023-11 Gasco Prog Rpt.pdf 82 KB GASCO0049837.pdf 658 KB 2023-12-06 - FW_ Gasco OU Uplands FS - FS Data Gap Screening and Summary Statistic Tables_Redacted.pdf 164 KB Tier4_2001033.pdf 23 MB Tier4_2000951 Revision 1.pdf 32 MB 310685_Results 021720.pdf 3 MB Tier4_2002435.pdf 20 MB K2102809.pdf 17 MB USMS0029582.pdf 10 MB 19K0396 CLPLIKE (Rev0).PDF 13 MB 21E0105 CLPLIKE (Rev0).PDF 75 MB GASCO0051587.pdf 781 KB 2023-12-01 - FW_ Gasco OU Upland Feasibility Study_Redacted.pdf 114 KB GASCO0053973.pdf 14 MB 2023-08-22 - PW-10_IDW Letter_082223.pdf 5 MB GASCO0052854.pdf 54 MB 2023-02-01 - BES initial PFAS letter to NW Natural.pdf 249 KB Anchor_A9J1114_Lvl_IV_DP.pdf 36 MB K2009806.pdf 17 MB 2023-12-08 - Disposal of Nonhazardous Wastes, PW-10U and PW-10Lb, NW Natural Gasco Site.pdf 6 MB 2023-11-02 - Revised Source Control Addendum Report and Appendices A - F.pdf 60 MB 2023-03-10 - HH RBDM and TPH RBC Workbooks.zip 0 KB Anchor_A0E0004_Lvl_IV_DP.pdf 121 MB Tier4_1903737.pdf 41 MB GASCO0053963.pdf 724 KB GASCO0067535.pdf 1 MB L2202953_ddp.pdf 50 MB Anchor_A1C0499_Lvl_IV_DP.pdf 68 MB 2023-02-22 - FW_ Request to discontinue manual measurements at the former Koppers basin_Redacted.pdf 109 KB Tier4_1904160 Revision 1.pdf 58 MB Anchor_A9K0609_Lvl_IV_DP.pdf 39 MB Anchor_A0D0207_Lvl_IV_DP.pdf 43 MB 2023-08-31 - Combined HC&C Operation Figures 1.1 to 7.30-print.pdf 21 MB A9J0058_Lvl_IV_DP.pdf 74 MB K2102458.pdf 2 MB Anchor_A1D0625_Lvl_IV_DP.pdf 18 MB GASCO0051627.pdf 630 KB Tier4_2002433.pdf 26 MB 21D0022 CLPLIKE (Rev2).pdf 79 MB GASCO0054432.pdf 2 MB 2023-03-02 - FW_ Draft Final PGM Year 2 Monitoring Report - for your review_Redacted.pdf 224 KB A9I0780_Lvl_IV_DP_A.pdf 24 MB Tier4_1903565.pdf 22 MB Anchor_A1E0078_Lvl_IV_DP.pdf 200 MB 20K0319 CLPLIKE (Rev0).PDF 90 MB L2019694_ddpr01.pdf 8 MB Tier4_2002171.pdf 44 MB L1954309_ddp.pdf 32 MB 2023-12-21 - FW_ Notification of Offloading and Disposal Completion - Gasco ISS Field Pilot Study_Redacted.pdf 88 KB Anchor_A0H0627_Lvl_IV_DP.pdf 100 MB K2104775.pdf 13 MB Tier4_2000412.pdf 43 MB Tier4_1904021.pdf 33 MB USMS0023980.pdf 12 MB Tier4_1904337.pdf 34 MB Anchor_A0B0680_Lvl_IV_DP.pdf 48 MB GASCO0053967.pdf 664 KB 2023-07-03 - FW_ Proposed groundwater monitoring program modification_Redacted.pdf 224 KB L2161038_ddp.pdf 26 MB 19K0228 CLPLIKE (Rev0).PDF 25 MB 2023-10-10 - Portland Gas Prog Rpt 3Q-2023.pdf 195 KB Geotech Results.pdf 18 MB GASCO0053794.pdf 2 MB 2023-07-14 - June2023DMRCoverLetter.pdf 160 KB Anchor_A0D0776_Lvl_IV_DP.pdf 91 MB 21E0096 CLPLIKE (Rev0) (1).PDF 134 MB Tier4_2105047.pdf 49 MB 2023-07-14 - FW_ Details of Ecological Soil RBC_PRG Information Requested_Redacted.pdf 335 KB USMS0038324 - 2023-06-20 - 02_License_DACW57-3-23-0056_NWN_Sample_Monitor_USMoorings_signed (2).pdf 762 KB Anchor_A0A0648_Lvl_IV_DP.pdf 61 MB GASCO0054097.pdf 748 KB 2023-07-13 - FW_ PGM Year 3 Bathymetry Results_Redacted.pdf 158 KB Tier4_2105021.pdf 25 MB Anchor_A0H0740_Lvl_IV_DP.pdf 96 MB GASCO0049448.pdf 886 KB 2023-05-22 - PRG-Memorandum Table 1 QC Review and Ecological Soil COC and PRG Tables Combined.pdf 383 KB GASCO0051533.pdf 716 KB 2023-04-14 - Revised Table 2_Free Product Mobility and Physical Parameters_2023-04-04.pdf 112 KB 2023-05-31 - 03_Figure 3b_June 2022 Bathy.pdf 3 MB Tier4_2002374.pdf 20 MB Anchor_A0E0568_Lvl_IV_DP.pdf 182 MB Anchor_A0H0387_Lvl_IV_DP.pdf 96 MB Anchor_A0C0058_Lvl_IV_DP.pdf 50 MB Anchor_A0B0059_Lvl_IV_DP_AQrev_050420.pdf 65 MB Tier4_1903827.pdf 38 MB 2023-01-03 - DEQ NLCI Letter_January 2023.pdf 223 KB USMS0024359.pdf 39 MB GASCO0054467.pdf 60 MB 2023-09-21 - Gasco OU_COC-PRG Tables_5a and 5b_2023-09-21.pdf 117 KB 20K0170 CLPLIKE (Rev1).PDF 122 MB Tier4_2000997.pdf 22 MB 2023-03-15 - Koppers Tank Basin Soils Disposal Package.pdf 6 MB Tier4_2000958.pdf 15 MB 2023-03-02 - Gasco_ Groundwater Quality Database through the 2022 Annual Event_Redacted.pdf 198 KB GASCO0049646.pdf 2 MB GASCO0051525.pdf 672 KB CalPortlandSample.pdf 76 KB Tier4_2001112.pdf 26 MB Tier4_2002436.pdf 15 MB Tier4_2002358.pdf 13 MB GASCO0051537.pdf 668 KB Tier4_1903646.pdf 14 MB A9J0357_Lvl_IV_DP.pdf 84 MB Anchor_A0A0715_Lvl_IV_DP.pdf 59 MB GASCO0049866.pdf 659 KB Anchor_A0J0978_Lvl_IV_DP.pdf 92 MB A9J0315_Lvl_IV_DP.pdf 90 MB 2023-04-14 - 05_Gasco Upland FS Schedule_2023-04-07.pdf 488 KB GASCO0048825.pdf 868 KB Tier4_2002535.pdf 13 MB 2023-04-14 - 04_FW_ Gasco Upland FS Schedule update_Redacted.pdf 99 KB GASCO0054089.pdf 705 KB GASCO0049634.pdf 1 MB GASCO0049857.pdf 659 KB GASCO0052503.pdf 881 KB Tier4_2002008.pdf 51 MB Tier4_2000194.pdf 43 MB GASCO0067505.pdf 736 KB GASCO0066786.pdf 7 MB GASCO0051629.pdf 2 MB Anchor_A0K0346_Lvl_IV_DP.pdf 159 MB L1954985_ddp.pdf 14 MB 2023-05-23 - T-201 NAPA Recovery Tank Disposal Package 3.pdf 1 MB K2010070.pdf 18 MB GASCO0053827.pdf 2 MB 21B0118 CLPLIKE (Rev0).PDF 40 MB EM2003~1.PDF 268 KB GASCO0051544.pdf 878 KB GASCO0049842.pdf 754 KB GASCO0052487.pdf 1 MB GASCO0049817.pdf 659 KB GASCO0067362.pdf 13 MB 2023-10-17 - T-125 Vapor Phase Carbon Residuals Disposal Package.pdf 8 MB GASCO0049814.pdf 676 KB 2023-08-18 - Final Former Koppers Basin Stormwater Pumping Installation Report (08.16.2023).pdf 2 MB GASCO0053965.pdf 677 KB 19I0422 CLPLIKE (Rev0).PDF 9 MB 2023-08-14 - 1st and 2nd QTR Monthly APEX Lab Report.zip 6 MB Tier4_2104304.pdf 15 MB GASCO0049986.pdf 659 KB GTX-313591-Final-Report-Results 05252021.pdf 341 KB GASCO0054184.pdf 636 KB 2023-08-22 - 2023 Data Gaps_IDW Letter_082223.pdf 5 MB Tier4_2001007.pdf 37 MB Anchor_A0E0281_Lvl_IV_DP.pdf 221 MB EM1903~1.PDF 169 KB 2023-10-25 - 02_B-57 Boring Log.pdf 60 KB Anchor_A0E0268_Lvl_IV_DP.pdf 146 MB 21D0180 CLPLIKE (Rev1).PDF 64 MB 2023-04-20 - FW_ Gasco_ Weekly Water Levels_ Koppers and LNG Basin Area_Redacted.pdf 325 KB GASCO0049845.pdf 677 KB 2023-02-28 - Q3 and Q4 2022 Residual Lab Data Package NW Natural Source Control Groundwater Treatment Facility_Redacted.pdf 497 KB 2023-08-14 - Assessment of DF at Siltronic Property_2023-08-14.pdf 7 MB GTX313361-Final-Report-04222021.pdf 2 MB Tier4_2105046.pdf 17 MB 2023-02-07 - Email re Proposed GW Monitoring Program_Redacted.pdf 97 KB Tier4_2001153.pdf 54 MB 2023-02-23 - FW_ Request to discontinue manual measurements at the former Koppers basin (DEQ approval)_Redacted.pdf 321 KB 2023-08-25 - Gasco OU Uplands FS - Ecological COC PRG Tables 1-5 for Discussion on August 31st_Redacted.pdf 134 KB GASCO0052843.pdf 657 KB Anchor_A1E0100_Lvl_IV_DP_A.pdf 183 MB GASCO0054192.pdf 676 KB 2023-08-18 - Email Mott Gasco_ Weekly Water Levels; Koppers and LNG Basin Area.pdf 311 KB Anchor_A9K0600_Lvl_IV_DP.pdf 104 MB 20K0188 CLPLIKE (Rev0).PDF 138 MB A9J0149_Lvl_IV_DP.pdf 181 MB 2023-11-15 - October Discharge Monitoring Report.pdf 132 KB 2023-02-09 - PW-10U Well Replacement (DEQ Approval)_Redacted.pdf 257 KB 2023-07-10 - Portland Gas Prog Rpt 2Q-2023.pdf 126 KB Anchor_A0H0152_Lvl_IV_DP.pdf 74 MB 2023-08-25 - Tables 3 through 5_Eco GW COCs & PRGs_2023-08-24.pdf 173 KB Tier4_2000959.pdf 15 MB Anchor_A0E0276_Lvl_IV_DP.pdf 112 MB Tier4_2104188.pdf 200 MB 2023-10-13 - 3rdQuarter2023TransmittalLtr.pdf 172 KB Tier4_2000142.pdf 55 MB Anchor_A0F0647_Lvl_IV_DP.pdf 33 MB GASCO0053455.pdf 48 MB 2023-04-12 - FW_ _External_64379-PW application review_Redacted.pdf 431 KB BF145 - A2J0599 FINAL 12 02 22 1304 Sevenson Gasco Filter Bags 111323.pdf 972 KB Tier4_2000856.pdf 23 MB GASCO0051564.pdf 705 KB Anchor_A0K0363_Lvl_IV_DP.pdf 186 MB Tier4_1904207.pdf 24 MB Tier4_2000946.pdf 19 MB Anchor_A0D0212_Lvl_IV_DP.pdf 56 MB 2023-10-13 - Sept 2023 DMR.pdf 126 KB Anchor_A0E0186_Lvl_IV_DP.pdf 136 MB USMS0038348.pdf 740 KB Tier4_1903829.pdf 7 MB GASCO0051503.pdf 2 MB 21D0179 CLPLIKE (Rev0).PDF 70 MB A9J0470_Lvl_IV_DP.pdf 127 MB GASCO0055971.pdf 23 MB GASCO0055328.pdf 1 MB Tier4_1903653.pdf 11 MB Tier4_2000406.pdf 51 MB 20K0291 CLPLIKE (Rev0).PDF 125 MB 2023-01-25 - FS DGWP_RTC_2023-01-25.pdf 8 MB 240588-NWN-CLtr-07-15-24.pdf 950 KB 2023-02-02 - FW_ PFAS Letter_EPA Memo_Redacted.pdf 251 KB Anchor_A0K0339_Lvl_IV_DP.pdf 160 MB 20K0204 CLPLIKE (Rev0).PDF 74 MB K2010495.pdf 16 MB GTX312732-Final-Report-01192021.pdf 1 MB Tier4_2202058.pdf 15 MB 2023-08-15 - Gasco_ Groundwater Quality Database through the 2023 Annual Event_Redacted.pdf 172 KB Tier4_2000968.pdf 21 MB USMS0031906.pdf 68 MB Anchor_A1C0736_Lvl_IV_DP.pdf 92 MB Anchor_A1C0625_Lvl_IV_DP.pdf 106 MB July 2022-A2G0560 FINAL 08 16 22 0839 Sevenson Gasco Monthly (2022).pdf 1 MB 2023-04-10 - HH PRG Meeting Tables.pdf 104 KB 2023-10-26 - 02_NWN USM Project Area DSL Short Term Access App Wyatt.pdf 25 MB 20K0203 CLPLIKE (Rev0).PDF 108 MB 2023-02-15 - January2023DMRCoverLetter.pdf 156 KB GASCO0054069.pdf 688 KB Tier4_2000143.pdf 55 MB K2010069.pdf 22 MB 2023-06-01- DEQ Comments_Siltronic Data Summary Report.pdf 733 KB GASCO0054063.pdf 1 MB GASCO0053796.pdf 730 KB 2023-03-20 - FW_ Gasco_ Weekly Water Levels_ Koppers and LNG Basin Area_Redacted.pdf 295 KB BF142 - A2G0559 FINAL 08 25 22 0903 Sevenson Gasco Filter Bags 111323.pdf 927 KB Anchor_A1E0049_Lvl_IV_DP.pdf 226 MB August 2022-A2H0777 FINAL 09 14 22 1127 Sevenson Gasco -- Monthly (2022).pdf 1 MB USMS0038316 - 2023-06-19 - US Moorings 2023 PDI FCR Form 2_2023-06-19.pdf 3 MB 2023-04-10 - HH TPH RBC Workbooks.zip 0 KB Tier4_2000947.pdf 14 MB Anchor_A0K0582_Lvl_IV_DP.pdf 157 MB GASCO0054194.pdf 3 MB GASCO0049851.pdf 662 KB GASCO0049999.pdf 27 MB 2023-10-31 - FW_RE_ Final Year 3 (2023) Monitoring Report for PGM Site is attached for your use (61743-RAEA)_Redacted.pdf 180 KB 240588-NWN-2023-ECRM-Exh A-07-15-24.pdf 995 KB 2023-02-03 - Gasco Upland FS Schedule.pdf 190 KB 2023-09-20 - 23-05-15 DMR & Labs_Revised.pdf 6 MB Anchor_A0J0273_Lvl_IV_DP.pdf 31 MB 240588-NWN-2023-ECRM-Exh D-07-15-24.pdf 285 KB Anchor_A0A0911_Lvl_IV_DP.pdf 28 MB USMS0021776.pdf 26 MB Tier4_1903826.pdf 55 MB 2023-02-27 - FW_ Gasco OU_ 2021 Hydraulic Control and Containment System Annual Report_Redacted and attached matrix_Redacted.pdf 2 MB 2023-12-07 - FW_ Inspection Letter - NW Natural_Redacted.pdf 250 KB Tier4_2000144.pdf 44 MB GASCO0053939.pdf 984 KB November 2022-A2K0622 FINAL 12 27 22 1313 Sevenson Gasco Monthly (2022).pdf 1 MB Anchor_A0E0612_Lvl_IV_DP.pdf 159 MB Anchor_A0D0701_Lvl_IV_DP.pdf 114 MB Anchor_A0J0344_Lvl_IV_DP_A.pdf 39 MB GASCO0054457.pdf 977 KB 2023-07-21 - FW_ _External_HC&C Operational Figures_Redacted.pdf 248 KB USMS0029525.pdf 1 MB GASCO0054202.PDF 2 MB Anchor_A0D0673_Lvl_IV_DP.pdf 96 MB Anchor_A0K0288_Lvl_IV_DP.pdf 259 MB Tier4_2000856 Revision 1.pdf 23 MB Anchor_A0A1011_Lvl_IV_DP.pdf 47 MB 2023-08-02 - NWN Gasco 1200-Z DMR Q4_2022-23.pdf 4 MB Tier4_2000974.pdf 16 MB L1951399_ddp.pdf 6 MB Tier4_2000301.pdf 14 MB USMS0021773.PDF 699 KB Anchor_A0B0406_Lvl_IV_DP.pdf 7 MB Anchor_A0K0733_Lvl_IV_DP.pdf 23 MB A9I0771_Lvl_IV_DP.pdf 31 MB USMS0032227.pdf 14 MB Anchor_A1E0231_Lvl_IV_DP.pdf 31 MB GASCO0049868.pdf 629 KB USMS0038340 - 2023-06-22 - FW_ US Moorings Project Area Phase 2 Pre-Design Investigation Daily Progress Report, June 21, 2023_Redacted.pdf 673 KB Tier4_2000995.pdf 49 MB GASCO0050099.pdf 1 MB Anchor_A0A0636_Lvl_IV_DP.pdf 37 MB GTX_312780_Results 010521.pdf 113 KB GASCO0051552.pdf 717 KB A9I0936_Lvl_IV_DP.pdf 109 MB Tier4_2001050.pdf 15 MB 2023-04-26 - 02_PGM SDU-Averaged Isopach Volumes_2023-04-26.pdf 140 KB GTX313591-Final-Report-06142021.pdf 4 MB Anchor_A9J0954_Lvl_IV_DP.pdf 82 MB Anchor_A9J0893_Lvl_IV_DP.pdf 90 MB Tier4_2002158.pdf 63 MB 2023-09-20 - FW_ Gasco_ Weekly Water Levels; Koppers and LNG Basin Area_Redacted.pdf 242 KB 2023-07-27 - FW_ PGM Year 3 Bathymetry Results_Redacted.pdf 156 KB Tier4_2000954.pdf 21 MB B1NC0008215.pdf 2 MB 2023-01-13 - 4thQuarter2022TransmittalLetter.pdf 169 KB Anchor_A0E0347_Lvl_IV_DP.pdf 54 MB GASCO0049984.pdf 659 KB 2023-10-19 - 02_Proposed PW-6Ub design documents.pdf 4 MB 2023-08-17 - FW_ Gasco OU - DNAPL Mobility and Sensitivity Analysis Meeting Follow up_Redacted.pdf 93 KB Anchor_A9J0716_Lvl_IV_DP.pdf 41 MB SanDisk_SecureAccess_QSG.pdf 3 MB Anchor_A0B0679_Lvl_IV_DP.pdf 66 MB GTX312780-Final-Report-01192021.pdf 2 MB USMS0038161.pdf 1 MB Tier4_1903650.pdf 43 MB Tier4_1903828.pdf 31 MB 2023-09-28 - FW_ Gasco OU_ 2022 Hydraulic Control and Containment System Annual Report_Redacted.pdf 297 KB Anchor_A0E0223_Lvl_IV_DP.pdf 72 MB GASCO0052191.pdf 668 KB Anchor_A0A0538_Lvl_IV_DP_A.pdf 48 MB GTX_312732_Results 011521.pdf 122 KB 2023-11-15OCT2023CoverLetter.pdf 145 KB B1NC0008222.pdf 908 KB GASCO0055228.pdf 2 MB FC2014 - A2K0620 FINAL 12 03 22 1207 Sevenson Gasco Filtercake 111323.pdf 906 KB GASCO0052193.pdf 865 KB