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1 Engineering Management Support, Inc. Memorandum To: Jesse Aviles, EPA RPM, VB/I70 Superfund Site From: Timothy C. Shangraw Date: November 21, 2017 Re: POLREP #28 - Vasquez Boulevard/Interstate 70 (VB/I70) Superfund Site, Operable Unit 2, Removal Action ======================================================================= On behalf of the City and County of Denver (Respondent), Engineering Management Support, Inc. (EMSI) is submitting this Pollution Report (POLREP #28) in accordance with Section 4.c of Appendix C to the Administrative Settlement Agreement and Order on Consent for Removal Action, for the subject Superfund Site (the Site). This report follows the outline detailed in Section 4.c of Appendix C, and contains pertinent new information specified in the Superfund Removal Procedures, Removal Response Reporting: POLREP and On-Scene Coordinator (OSC) Reports (EPA, 1994). Section I Heading The date, site name, report author, report recipient, and report number are presented above. Section II Response Information This reporting period extended from October 1 through 31, 2017 during which time, the following activities occurred: Excavation of Regulated Asbestos-Contaminated Soils (RACS) and hauling to and disposing at the Denver Arapahoe Disposal Site (DADS); Construction of the concrete box conduit, outlet wing walls, and open channel sidewall footings through the Coliseum Parking Lot (CPL); Pumping and treatment of groundwater from dewatering zones 1, 2, 3a, and 3b; Construction of the drop inlet structure and reinforced box conduits (RBCs) in dewatering zone 2 (beneath Delgany sanitary sewers); Construction of lateral drain boxes in dewatering zone 3a; On-site and off-site monitoring for air quality, dust, and odors; and Updated the groundwater flow model to reflect new hydrogeologic conditions observed during construction. The volumes of RACS excavated and managed, and the volumes of water pumped, treated, and returned to the South Platte River, are summarized in Table 1. On-site monitoring for volatile organic compounds (including methane), odor, and visible dust emissions occurred continuously during excavation and drilling activities. In addition,

2 Memorandum POLREP #27 VB/I70, OU2 removal Action November 21, 2017 Page 2 monitoring for airborne asbestos fibers proceeded in accordance with Section 5.5 of the Colorado Department of Public Health and Environment (CDPHE) Solid Waste Regulations. Due to their overall size, daily monitoring reports for volatile organic compounds, odor, dust, and asbestos are being submitted under separate cover. Off-Site monitoring by Denver for PM 10, airborne lead and arsenic at four locations within the monitoring boundary continued throughout the reporting period. Sampling from these stations occurred every sixth day throughout the month. Results were all below Occupational Safety and Health Administration 8-hour limits and National Ambient Air Quality Standards. Monthly monitoring report are posted on the Globeville Landing Outfall (GLO) project web site at: As part of the GLO project s Community Outreach program, a community hotline was operated. No complaints were received during the reporting period. The Community Advisory Group (CAG) held its ninth meeting on November 14 th. Meeting minutes are posted on the VB/I-70 Superfund Community Advisory Group web site. The next CAG meeting is scheduled for December 12 th. The following project meetings were held in October: Weekly GLO Project Status Meetings (October 5, 12, 19, and 26, 2017); and EPA monthly progress meeting (October 18, 2017). Lastly, a 3-week look-ahead Construction Schedule is attached to this POLREP. Section III Issues, Resolutions, and Planned Activities A Quality Assurance Audit was performed on Asbestos-Containing Soils Daily Reports (ACSRs) prepared by Kleinfelder during the month of September for consistency with Section 5.5 of Colorado s Solid Waste Regulations (CSWRs) and the Final Materials Management Plan (MMP) (EMSI, 2016). No deficiencies were noted. A copy of this Audit Report is attached to this POLREP. Monitoring of treated effluent from the GLO project continued during the reporting period in accordance with Discharge Permit Number CO All monitored parameters with the exception of selenium met effluent discharge limits. A potentially dissolved selenium concentration of 23.7 ug/l, compared to a permit limit of 4.6 ug/l, was reported for an effluent sample collected on October 2 nd. Because the influent sample was detected at only 3.0 ug/l, and when compared to historical influent and effluent selenium concentrations since dewatering began (see summary table attached), the reported elevated selenium concentration appears anomalous. The Certified Operator of the treatment facility has requested the laboratory to reanalyze the sample to confirm or negate this apparent anomaly. As soon as results become available, they will be reported to EPA. Meanwhile, the treatment plant operator confirmed that plant operating parameters prior to and during the sampling event were within normal operating

3 Memorandum POLREP #27 VB/I70, OU2 removal Action November 21, 2017 Page 3 ranges, and that sampling procedures, preservation, chain of custody, and delivery procedures were followed exactly as in the past. CDPHE personnel (Mr. Dave Kurz and Mr. Eric Minc) were notified of the potential exceedance and agreed with the steps being taken to address the situation. Planned activities for the next reporting period consist of: Finish construction of the concrete box conduit through the CPL; Continue construction of outlet wing walls and open channel sidewall footings through the CPL; Installation of the strengthening layer in the CPL and GLP; Continued construction of lateral drain boxes in the GLP; Continued construction of outlet structures and riprap downstream of the RBCs in the GLP; Continued dewatering in zones 1, 2, 3a and 3b; and Continued on-site and off-site monitoring of air quality. To maintain effective and transparent communication during GLO implementation, EPA and CDPHE personnel are invited to participate in weekly coordination meetings at Kiewit s RiNo office. The next two EPA Monthly Status meeting will be held on November 15 th and December 20 th at 9:00 in the Webb building. Please call Jennifer Luthi ( ) or me ( ) if you have any questions. Attachments: October 2017 Summary of GLO Construction Activities 3-Week Look-Ahead Schedule QA Audit Report #6 Summary of Effluent and Influent Analytical

4 Table 1: Summary Construction Report for October 2017 Current Month QTY QTY to date Comments EXCAVATION/HAULING # of days Excavation occurred Globeville park # of days Excavation occurred Municipal Landfill 31 Volume of Racs Excavated (CY) 7,896 83,255 From Globeville Park and Coliseum Parking lot Volume of Racs hauled to DADS (CY) 7,896 83,255 From Globeville Park and Coliseum Parking lot Volume of Non-Racs Excavated (CY) 0 58,577 Volume of Non-Racs stockpiled onsite (CY) 0 12,606 Claystone from drop inlet stockpiled for reuse Volume of Non-Racs hauled to DADS (CY) 0 45,971 Volume Hauled to Clean Harbors (CY) 0 GROUT AND STONE COLUMNS number of grout columns installed this month 0 1,091 All Stone and Grout columns are complete Grout column SPT testing results 0 0 All Stone and Grout columns are complete number of stone columns installed per month All Stone and Grout columns are complete stone column test results 0 0 All Stone and Grout columns are complete REMEDIATION DEWATERING AND TREATMENT LF of underdrain/wick wells installed Volume of water transported and treated at MFEI 1,701,500 21,881,875 Volume of treated water, including dilution, discharged to S. Platte 1,717,396 22,313,800 Analytical results 0 Sept DMR submitted CONSTRUCITION DEWATERING status of permit compliance LINER INSTALLATION % complete during the month N/A QC/QA testing results N/A Issues and Resolutions N/A MODCP RESULTS Daily Methane, Odor, and Dust monitoring reports Issues and Resolutions COMMUNITY OUTREACH Summary of Calls to hotline Issues and Resolutions

5 Globeville Phase 2/Brighton Segment 2 Schedule Title Current Week Phase 2-3 week schedule Monday, November 13, 2017 Item Activity Description Work performed by Start Finish Shift Current Forecast Forecast Forecast 11/13 11/13 11/14 11/14 11/15 11/15 11/16 11/16 11/17 11/17 11/18 11/18 11/19 11/19 11/20 11/20 11/21 11/21 11/22 11/22 11/23 11/23 11/24 11/24 11/25 11/25 11/26 11/26 11/27 11/27 11/28 11/28 11/29 11/29 11/30 11/30 12/01 12/01 12/02 12/02 12/03 12/03 12/04 12/04 12/05 12/05 12/06 12/06 12/07 12/07 12/08 12/08 12/09 12/09 12/10 12/10 M T W T F Sa Su M T W T F Sa Su M T W T F Sa Su M T W T F Sa Su 1 WORK BY OTHERS 2 Lower Xcel Million Volt Line?? 3 Lower Zayo line at 44th?? 4 AT&T from 40th to 44th 11/20/17 11/30/17 5 Lower JUT Comcast Manhole between 40th and 41st?? 6 LVL3/8x8 conflict at 44th?? 7 8 BRIGHTON BLVD SEGMENT 2 11 Finish Waterline Abandonments at 44th/Brighton Ames 11/14/17 11/15/17 Day 10 F/P/S SSP 37Z, 67a and 88 Ames 11/10/17 11/20/17 Day 9 Install Pipe/Backfill SSPs 36z, 67a and 88 Ames 11/27/17 11/29/17 Day 12 D/L/B MH38 to CB45 Ames 11/27/17 11/28/17 Day 13 D/L/B Box to CB43 Ames 11/28/17 11/29/17 Day 14 D/L/B 15" RCP to MH68 Ames 11/30/17 12/01/17 Day 13 D/L/B MH66 to CB86 Ames 12/04/17 12/05/17 Day 14 D/L/B MH67 to CB88 Ames 12/05/17 12/06/17 Day 15 Prep for detour paving Ames 11/29/17 12/06/17 Day 16 Pave for detour and shoo fly Ames 12/07/17 12/08/17 Day GLOBEVILLE PHASE 'x12' BOX CULVERT 20 Drive Sheets for precast boxes Ames 07/08/17 12/15/17 Night 21 Install 8x8 Precast Box Culvert ( ) Ames 11/09/17 11/30/17 Day 22 Install 8x8 Precast Box Culvert ( ) - 44TH CLOSURE Ames 11/30/17 12/04/17 Day 23 Install 8x8 Precast Box Culvert ( ) - END OF PH2 Ames 12/07/17 12/15/17 Day 23 Install 14x12 Precast Box Culvert ( ) Ames 11/06/17 12/07/17 Day 24 Install Shoring/Excavate for 40th 14x12 CIP Bend Ames 12/08/17 12/18/17 Day 25 Install 14x12 Precast Box Culvert (28+08 to 29+18) Ames 12/19/17 01/05/17 Day 26 Backfill CIP Bends/Install Basket Wall/Remove Shoring Ames 11/10/17 11/29/17 Day Note: Shoring activities will take place at night (5:00pm to 5:00am) starting 9/5/17 Closure of 44th

6 Engineering Management Support, Inc. QA Audit Report #6 To: From: cc: Matt Ceresa, Kiewit, Tim Shangraw, EMSI Jennifer Luthi, DEH; Steve Gonzales, DEH; Bret Banwart (DPW); Brian McLaren (DPW); and Patrick Riley (DPW) Date: November 14, 2017 Re: Audit of Kleinfelder CABI Notes, September 2017, Globeville Landing Outfall Project Representatives from Engineering Management Support, Inc. (EMSI) reviewed Asbestos- Containing Soils Daily Reports (ACSRs) prepared by Kleinfelder during the month of September 2017 for consistency with Section 5.5 of Colorado s Solid Waste Regulations (CSWRs) and the Final Materials Management Plan (MMP) (EMSI, 2016). Documentation of the review is presented in the attached summary table. AUDIT FINDINGS Quality Control continues to be implemented well. As shown in the attached table, all audited parameters complied with Section 5.5 of the CSWRs and the MMP. ACTION REQUIRED No corrective action is required. Denver and EMSI will continue to monitor Ames/Kleinfelder s implementation of agreed-to reporting procedures and identify any area(s) in need of improvement during monthly progress meetings and if necessary, in subsequent QA Audit Reports. Page 1

7 September 2017 QA of CABI daily logs per Colorado Regulation L (Documentation) and Final Materials Management Plan 1C 1A 1B 1D Personnel Date Grid Grid Site Description Description Description of Description Description Friability per CABI diagram description of site of equipment hand removals of types of suspect of ACMs Notes agree w including activities use including of debris materials discussed CABI location locations Tyler Godby 9/1/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/1/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/2/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/5/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/5/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/6/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/6/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/7/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/7/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/8/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/8/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/9/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/11/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/11/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/12/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/12/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/13/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/13/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/14/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/14/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/15/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/15/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/16/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/18/17 yes yes yes yes yes yes yes yes yes Mitchell Reese 9/18/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/19/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/19/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/20/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/20/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/21/17 yes yes yes yes yes yes yes yes yes Page 1

8 September 2017 QA of CABI daily logs per Colorado Regulation L (Documentation) and Final Materials Management Plan 1C 1A 1B 1D Personnel Date Grid Grid Site Description Description Description of Description Description Friability per CABI diagram description of site of equipment hand removals of types of suspect of ACMs Notes agree w including activities use including of debris materials discussed CABI location locations Lanaia Carveth 9/21/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/22/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/22/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/23/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/26/17 yes yes yes yes yes yes yes yes yes Lanaia Carveth 9/27/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/27/17 yes yes yes yes yes yes yes yes yes Tim Ponder 9/27/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/29/17 yes yes yes yes yes yes yes yes yes Mitchell Reese 9/29/17 yes yes yes yes yes yes yes yes yes Tyler Godby 9/30/17 yes yes yes yes yes yes yes yes yes Notes: 1) NVE = no visible emissions observed 2) in the table "yes" designates that documentation was completed Page 2

9 September 2017 QA of CABI daily logs per Colorado Regulation L (Documentation) and Final Materials Management Plan 2A and 2B 4 5B 1E 1F Personnel Date Bulk sampling Decontamination Spill Observations Observations Observations Photo-log / documentation visual inspection response of visible of non-earthen of other description and clearance activities emissions / material / indicators of Reponses commented soil impact Tyler Godby 9/1/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/1/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/2/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/5/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/5/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/6/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/6/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/7/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/7/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/8/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/8/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/9/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/11/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/11/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/12/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/12/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/13/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/13/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/14/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/14/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/15/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/15/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/16/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/18/17 Not conducted yes No spills NVE yes yes yes Mitchell Reese 9/18/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/19/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/19/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/20/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/20/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/21/17 Not conducted yes No spills NVE yes yes yes Page 3

10 September 2017 QA of CABI daily logs per Colorado Regulation L (Documentation) and Final Materials Management Plan 2A and 2B 4 5B 1E 1F Personnel Date Bulk sampling Decontamination Spill Observations Observations Observations Photo-log / documentation visual inspection response of visible of non-earthen of other description and clearance activities emissions / material / indicators of Reponses commented soil impact Lanaia Carveth 9/21/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/22/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/22/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/23/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/26/17 Not conducted yes No spills NVE yes yes yes Lanaia Carveth 9/27/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/27/17 Not conducted yes No spills NVE yes yes yes Tim Ponder 9/27/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/29/17 Not conducted yes No spills NVE yes yes yes Mitchell Reese 9/29/17 Not conducted yes No spills NVE yes yes yes Tyler Godby 9/30/17 Not conducted yes No spills NVE yes yes yes Page 4

11 Historical Influent and Effluent Water Quality, GLO Water Treatment Plant Parameter Unit Sample Frequency Effluent Permit Limit May-17 Jun-17 Influent* Effluent** Influent* Effluent** Influent* Effluent** Influent* Effluent** Influent* Effluent** Influent* Effluent** Flow Rate (monthly ave) gpm Continuous 100 N/R 95.5 N/R 96.8 N/R 91.2 N/R 84.5 N/R 54.6 N/R 38.5 ph standard units 3 days/wk N/R N/R N/R N/R N/R N/R Total Residual Chlorine mg/l 3 days/wk 0.5 N/R N/R N/R N/R N/R N/R Oil and Grease (visual) visual presence 3 days/wk Report N/R None N/R None N/R None N/R None N/R None N/R None Oil and Grease (lab) mg/l Contingent upon visual presence 10 N/R N/R N/R N/R N/R N/R N/R N/R N/R N/R N/R N/R Total Suspended Solids mg/l Weekly N/R <5-21 N/R 1.4J N/R <5-2.5J N/R < N/R N/R E. Coli #/100 ml Weekly N/R <1-2 N/R <1 N/R <1 N/R <1-105 N/R <1-54 N/R <1-1 BOD 5 mg/l Monthly N/R <2 N/R <1 N/R <1 N/R 1.1 N/R 2.6 N/R <1.0 Total Inorganic Nitrogen mg/l Monthly 10 N/R 8.4 N/R 8.7 N/R 8.7 N/R 8.3 N/R 5.9 N/R 6.8 Ammonia mg/l Monthly Report N/R 0.48 N/R 0.3 N/R 0.26 N/R 0.38 N/R 0.38 N/R 0.04 Arsenic, total recoverable ug/l Monthly < < Cadmium, potentially dissolved ug/l Monthly < < < < < <0.2 Copper, potentially dissolved ug/l Monthly 5,656-6, < Iron, total recoverable ug/l Monthly 253, < < Lead, total recoverable ug/l Monthly 13, < <1.0 <1.0 < <1.0 Lead, potentially dissolved ug/l Monthly 2, < <1.0 < <1.0 Mercury, total ug/l Monthly 3.5 N/R <0.2 N/R <0.2 N/R <0.1 N/R <0.1 N/R <0.1 N/R 2.0 Selenium, potentially dissolved ug/l Monthly < WET Testing LC 50 Quarterly 100 N/R N/R N/R Failed, then passed N/R N/R N/R N/R N/R N/R N/R Passsed shaded cell indicates compliance with permit limit shaded cell indicates influent exceeds discharge limit; treatment required shaded cell indicates effluent exceeds permit limit * Metals Screen required per Section 1.A.3 of GLO Discharge Permit. VOC and SVOC screens confirmed only trace detections. ** Monitored parameters required per Section 1.A.2 of GLO Discharge Permit N/R Not Required Jul-17 Aug-17 Sep-17 Oct-17

The date, site name, report author, report recipient, and report number are presented above.

The date, site name, report author, report recipient, and report number are presented above. Engineering Management Support, Inc. Memorandum To: Jesse Aviles, EPA RPM, VB/I70 Superfund Site From: Timothy C. Shangraw Date: October 17, 2017 Re: POLREP #27 - Vasquez Boulevard/Interstate 70 (VB/I70)