Memorandum To: Jesse Aviles, EPA RPM, VB/I70 Superfund Site

From: Timothy C. Shangraw

Date: January 25, 2018

Re: POLREP #30 - 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 #30) 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 December 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 outlet wing walls and open channel sidewalls through the Coliseum Parking Lot (CPL);

Construction of inlet and outlet wing walls, open channel sidewalls, lateral drain boxes, UV treatment box, Arkins Court transition structure, and outlet rip rap through the Globeville Landing Park (GLP);

Pumping and treatment of groundwater from dewatering zones 1, 2, 3a, and 3b;

On-site and off-site monitoring for air quality, dust, and odors;

Finalizing groundwater flow modeling that evaluated new hydrogeologic conditions observed during construction; and

Preparing Addendum 3 to the Final Design Report (EMSI, 2016a) that proposes leaving sheet piles in place along the south side of the GLO project and eliminating the check dam in the strengthening layer.

Engineering Management

Support, Inc.

Memorandum

POLREP #30

VB/I70, OU2 removal Action

January 25, 2018

Page 2

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 activities. In addition, monitoring for airborne asbestos fibers proceeded in accordance with Section 5.5 of the Colorado’s Solid Waste Regulations (CSWRs). 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 PM10, 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 reports are posted on the Globeville Landing Outfall (GLO) project web site at: https://www.denvergov.org/content/denvergov/en/environmental-health/environmental-quality/land-use-and-planning.html.

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 eleventh meeting on January 9

th. Meeting minutes are posted on the VB/I-70

Superfund Community Advisory Group web site. The next CAG meeting is scheduled for February 13, 2018.

The following project meetings were held in December and earlier this month:

Weekly GLO Project Status Meetings (December 7, 14, and 21, 2017);

EPA monthly progress meeting (December 20, 2017); and

Tour of the GLO Phase 1 and Phase 2 (Pepsi property) projects (January 17, 2018).

Lastly, a 3-week look-ahead Construction Schedule is attached to this POLREP. Section III – Issues, Resolutions, and Planned Activities

Quality Assurance (QA) Audit Report #8 was prepared in December. It involved a day-long independent assessment of environmental monitoring activities by an EMSI representative in accordance with the Section 5.5 of the CSWRs and the Final Materials Management Plan (MMP) (EMSI, 2016b), and comparison of activity observations with those of field personnel from Kleinfelder. Only one deficiency was identified. It was corrected and the audit was closed. A copy of the 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 CO0049002. All monitored parameters met

discharge limits during the month.

Memorandum

POLREP #30

VB/I70, OU2 removal Action

January 25, 2018

Page 3

Planned activities for the next reporting period consist of:

Continue construction of wing walls and open channel sidewalls through the CPL and GLP;

Continued construction of lateral drain boxes in the GLP;

Continued construction of outlet structures, transition zones, and riprap in the GLP;

Continued final grading of the drainage channel in preparation for placement of the strengthening layer;

Continued dewatering in zones 1, 2, 3a and 3b;

Continued on-site and off-site monitoring of air quality; and

Submittal of Addendum 3 to the Final Design Report (EMSI, 2016a).

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 EPA Monthly Status meeting will be held on February 21st at 9:00 am in the Webb building.

Please call Jennifer Luthi (720.865.5432) or me (303.619.5179) if you have any questions. Attachments:

December 2017 Summary of GLO Construction Activities 3-Week Look-Ahead Schedule QA Audit Report # 8 Summary of Effluent and Influent Analytical Results

Table 1 - December 2017 Construction Summary

Current Month QTY QTY to date Comments

EXCAVATION/HAULING

# of days Excavation occurred Globeville park 1 98

# of days Excavation occurred Municipal Landfill 35

Volume of Racs Excavated (CY) 364 89,527 From Globeville Park

Volume of Racs hauled to DADS (CY) 364 89,527 From Globeville Park

Volume of Non-Racs Excavated (CY) 58,969

Volume of Non-Racs stockpiled onsite (CY) 12,606

Volume of Non-Racs hauled to DADS (CY) 46,363

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 0 575 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 650

Volume of water transported and treated at MFEI 1,702,404 25,271,775

Volume of treated water, including dilution, discharged

to S. Platte 1,425,181 25,460,838

Analytical results 0 Nov 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

Current Forecast Forecast Forecast Comments

Work

performed byShift

01/2

2

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01/2

9

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0

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1

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1

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2

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8

M T W T F Sa Su T W T F Sa Su T W T F Sa Su T W T F Sa Su

1

2 EARTHWORK (Park Channel)

3 Install Tensar & 18" Rock Sta 6+70 to 8+50 Ames 01/05/18 01/22/18 day

4 Install Grouted boulders on Conduit Apron Ames 01/12/18 01/31/18 day

5 remove sheet pile in front of drop inlet Ames 01/19/18 01/26/18 day

6 Grade channel 4+50 to 6+70 Ames 01/29/18 02/02/18 day

7

8

9 OUTFALL CHANNEL

10 Excavate for Grouted boulders drop outlet Ames 01/25/18 01/30/18 day

11 Place grouted boulders drop outlet Ames 01/26/18 02/02/18 day

12 Place bedding and soil rip rap around drop outlet Ames 01/24/18 02/02/18 day

13 Remove sheets by river edge Ames 02/02/18 02/09/18 day

14

15

16 S. LATERAL DRAIN BOX

17 Form Deck sections 1-6 Ames 01/08/18 02/28/18 day

18

19

20

21 N. LATERAL DRAIN BOX

22 F/R/P N. Lateral Walls sections 1-4 Ames 01/02/18 01/25/18 day

23 F/R/P N. Lateral deck sections 1-4 Ames 02/05/18 02/25/18

24

25 EAST PARK WALL

26 F/R/P section 8 East park wall Footings Ames 02/12/18 02/17/18 day

27 F/R/P section 8 East park wall wall Ames 02/20/18 02/28/18 day

28

29 WEST PARK WALL

30 F/R/P West Park wall section 2,4 Walls Ames 01/16/18 01/26/18 day

31

32 N. Coliseum Wall

33

34

35 UV Vault

36 Drive sheets for UV vault shoring Ames 01/31/18 02/09/18 day

37 F/R/D UV vault footing Ames day

38

39 N. Bridge Abutment

40 Finegrade for abutment footing Ames 01/29/18 02/01/18 day

41 F/R/P N. Abutment Footing Ames 02/05/18 02/15/18 day

42

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Phase 1A 3 week schedule

Monday, January 22, 2018

Item

Globeville Phase 1ASchedule Title

Current Week

Finish Start Activity Description

M M

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Current Forecast Forecast Forecast Comments

Work

performed byShift

01/2

2

01/2

2

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M T W T F Sa Su T W T F Sa Su T W T F Sa Su T W T F Sa SuM

Phase 1A 3 week schedule

Monday, January 22, 2018

Item

Globeville Phase 1ASchedule Title

Current Week

Finish Start Activity Description

M M

43 S. Bridge Abutment

44 F/R/P Abutment wing walls Ames

45

46 Arkins outlet

47 F/R/P South Wing walls A1, J1, K1 Ames 01/17/18 01/26/18 day

48 Drive sheets along Arkins Ames 01/24/18 01/29/18 day

49 Excavate for North Wing wall footings Ames 01/29/18 02/02/18 day

50 F/R/P North Wing walls Footings A1, J1, K1 Ames 02/05/18 02/20/18 day

51

52

53

54

55

56

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58

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Page 1

Engineering Management

Support, Inc.

QA Audit Report #8

To: Matt Ceresa, Kiewit,

From: Tim Shangraw, EMSI

cc:

Jennifer Luthi, DEH; Steve Gonzales, DEH; Bret Banwart (DPW); Brian McLaren (DPW); and Patrick Riley (DPW)

Date: January 4, 2018

Re:

Audit of Kleinfelder’s Environmental Monitoring Activities on December 6, 2017 at Globeville Landing Outfall Project

On December 6, 2017, a representative from Engineering Management Support, Inc. (EMSI) conducted a day-long QA audit of environmental monitoring activities at the Globeville Landing Outfall (GLO) project for consistency with Section 5.5 of Colorado’s Solid Waste Regulations (CSWRs) and the Final Materials Management Plan (MMP) (EMSI, 2016). Mr. David Matteocci with Matteocci & Associates, LLC represented EMSI and Ms. Lanaia Carveth and Mr. Billy Godby represented Kleinfelder.

With respect to Section 5.5 of the CSWRs, the audit involved an independent inspection of asbestos handling activities, identifying the types and frequencies of suspect material encountered, documentation of findings, sampling, assessment of regulated work areas (RWAs) and how they were protected, who entered the RWAs and what personal protection they were wearing, decontamination procedures, observations of possible visible emissions from RWAs, and other possible indicators of impacted soils.

With respect to the MMP, the audit involved an independent inspection of environmental screening activities of excavated materials, as well as odor and dust control monitoring.

The EMSI representative completed his own environmental observations and documentation of the day’s monitoring activities performed by Kleinfelder, and excavations performed by Ames and its subcontractors. He then met with Kleinfelder personnel to review their observations and logs, and discussed discrepancies. Any discrepancies or omissions were resolved and documented in both EMSI’s logs and Kleinfelder’s logs. Copies of EMSI’s logs are attached to this Audit Report. Due to their size, copies of Kleinfelder’s logs are submitted under separate cover.

AUDIT FINDINGS

One minor issue was identified, and two recommendations were added in the field audit report on page 5 of 5.

QA Audit Report #8, GLO Project January 4, 2018

Page 2

Billy Godby’s paperwork had listed J3 and J4 in his descriptions and notes, but was not highlighted on the grid map.

ACTION REQUIRED

Add J3 and J4 to grid map on Billy Godby’s paperwork. Kleinfelder completed this action. Therefore, this audit is closed.

Attachments

Bulk Sample References Use (ID,RES#) in ACSR- Rows 1A/1B

Use ID’s and RES#’s to search for picture in Bulk Sample Log document to verify that material has been sampled

Commonly Identified Debris/ Suspect Materials (Non-detect): Red Brick (white mortar): (GLO-171127-J4-RB2, RES#395261) Yellow Brick: (GLO-171006-PL-1, RES#391561) Plaster-White (non-granular): (GLO-171127-J4-DW1, RES#395261) Tan ceramic tile (stripe indentation): (GLO-171127-J4-C1, RES#395261) Yellow fire brick: (GLO-171006-PL-1, RES#391561) Light Weight Concrete- (GLO-171006-LWC-1, RES#391561) White(ish) insulation (fiberglass): (GLO-170906E4-MM1, RES#389239) Green painted concrete: (GLO-170828-K12-C1, RES#388403) Orange fire brick (GLO-GR09-04, RES#373941) ** Re-sample if seen Hexagonal white ceramic tile: (GLO-170828-I7-PT1, RES#388403) Brown fiberboard w/ off-white paint: (GLO-171017-J4-3, RES#392363) Commonly Identified Suspect Materials (ACM): Tile- Gray w/ black adhesive (ACM): (GLO-170725-FT4, RES#385419) Black floor tile w/ white streak pattern (ACM): (GLO-170725-J4-FT1, RES#385332) Transite- Large fibrous brick (ACM): (GLO-170714-T1, RES#384551) Green floor tile w/ white streak pattern (ACM): (GLO-GR11-07, RES#373491) Thermal System Insulation (ACM): (GLO-171006-TSI-1, RES#391561) Black floor tile (ACM): (GLO-171127-J4-FT3, RES#395261) White checkered tan linoleum (ACM): (GLO-171127-J4-FT1, RES#395261) Transite Siding (ACM): (GLO-171127-J4-FT4, RES#395261)

Historical Influent and Effluent Water Quality, GLO Water Treatment Plant

Influent* Effluent** Influent* Effluent** 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 N/R 32.9 N/R 31.9

pH standard units 3 days/wk 6.5 - 9 N/R 7.05 - 7.98 N/R 7.53 - 8.11 N/R 6.83 - 8.13 N/R 7.37 - 8.21 N/R 6.8 - 8.4 N/R 7.1 - 8.4 N/R 7.1 - 8.0 N/R 7.2 - 8.1

Total Residual Chlorine mg/L 3 days/wk 0.5 N/R 0 - 0.35 N/R 0 - 0.29 N/R 0.01 - 0.29 N/R 0 - 0. 14 N/R 0 - 0.02 N/R 0 - 0.22 N/R 0 - 0.01 N/R 0 - 0.03

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 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 N/R N/R N/R N/R

Total Suspended Solids mg/L Weekly 30 - 45 N/R <5 - 21 N/R 1.4J - 7.3 N/R <5 - 2.5J N/R <2.5 - 13.3 N/R 0.6 - 21.9 N/R 1.7 - 7.7 N/R <2.5 - 20.4 N/R <2.5 - 3.8

E. Coli #/100 ml Weekly 126 - 252 N/R 0 - 2 N/R 0 N/R 0 N/R 0 - 105 N/R 0 - 54 N/R 0 - 1 N/R 0 - 1 N/R 0 - 11

BOD5 mg/L Monthly 30 - 45 N/R <2 N/R <1 N/R <1 N/R 1.1 N/R 2.6 N/R <1.0 N/R 11.4 N/R 7.4

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 N/R 5.9 N/R 5.9

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 N/R 0.38 N/R 1.2

Arsenic, total recoverable ug/L Monthly 3.0 7.4 <0.6 3.0 0.55 3.9 <0.4 3.6 0.76 4.1 0.93 3.5 0.61 3.8 0.73 4.5 0.65

Cadmium, potentially dissolved ug/L Monthly 0.87 1.88 <0.1 0.9 <0.2 0.74 <0.2 1.2 <0.2 1.6 <0.2 1.7 <0.2 0.81 <0.2 1.1 <0.2

Copper, potentially dissolved ug/L Monthly 5,656 - 6,975 14.8 1.1 6.1 3.2 - 6.1 4.7 4.1 6 5.9 4.3 <4.0 7.1 6.8 4.5 4.8 6.4 10.9

Iron, total recoverable ug/L Monthly 253,000 8020 50 259 78.2 - 91 332 <500 115 43.4 106 <20 254 53.8 99 315 369 443

Lead, total recoverable ug/L Monthly 13,005 47.2 0.6 1.8 0.8 - 1.0 1.4 <1.0 2.1 <1.0 <1.0 <1.0 1.4 <1.0 1.3 <1.0 1.3 <1.0

Lead, potentially dissolved ug/L Monthly 2,405 42.3 0.5 1.6 0.8 - 1.1 3.2 <1.0 1.1 1.9 <1.0 <1.0 1.4 <1.0 1.2 <1.0 <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 N/R 0.6 N/R <0.1

Selenium, potentially dissolved ug/L Monthly 4.6 3.0 - 3.1 3.3 3.2 2.4 - 3.8 4.5 2.2 3.3 1.9 2.5 <0.8 3.0 23.7 4.0 2.3 1.1 2.6

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 N/R N/R N/R N/R

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-17Jun-17Parameter Unit

Sample

Frequency

Effluent

Permit Limit

May-17 Dec-17Nov-17Sep-17 Oct-17Aug-17