Site Report: JBER-Elmendorf CG112 Wewak
| Site Name: | JBER-Elmendorf CG112 Wewak |
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| Address: | 20th Street and Sijan Avenue, Formerly Elmendorf Air Force Base before 10/01/2010, Elmendorf AFB (JBER), AK 99506 |
| File Number: | 2101.38.153 |
| Hazard ID: | 26540 |
| Status: | Active |
| Staff: | Ginna Quesada, 9074515960 ginna.quesada@alaska.gov |
| Latitude: | 61.241453 |
| Longitude: | -149.800209 |
| Horizontal Datum: | WGS84 |
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We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.
Problems/Comments
In July 2013, during the investigation of CG527, an area of unrelated smear zone soil contamination containing diesel-range organics (DRO) and gasoline range organics (GRO) was identified 100' south of Wewak Drive and Slammer Avenue. As a result, new site CG112 was created.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 4/1/2016 | Update or Other Action | Draft UFP-QAPP received for review & comment on several sites with also include this one. Site CG112 - Wewak is an area of petroleum contamination located on Joint Base Elmendorf-Richardson (JBER) - Elmendorf (JBER-E) in the vicinity of the intersection of 20th Street & Sijan Avenue, & south of Wewak Drive. CG112 was identified in 2013 during an investigation at Site CG527, an area of petroleum contamination related to underground storage tanks (USTs) & a former fuel loading dock south of the Jet Engine Shop (Building 8459). The investigation at CG527 determined that additional petroleum contamination with an unrelated source was present to the southeast of CG527. The source & extent of the contamination at CG112 have not been determined. Soil sample analysis results for the smear zone samples indicate that DRO (ranging up to an estimated 770 milligrams per kilogram [mg/kg]) & GRO (ranging up to 3,300 mg/kg) are above ADEC’s18 AAC 75 Method Two Table B2 migration to GW cleanup levels at all three locations. Samples were also collected for RRO; BTEX; PAHs; EPH; & VPH. Two additional analytes, benzene & total xylenes, were also detected above the project screening levels (SLs) in smear zone samples. Benzene was detected above the SL (0.025 mg/kg) at one location (13CG527-SB02) at 026 mg/kg; & total xylenes were detected at 13.8 mg/kg & 7.9 mg/kg, respectively. The purpose of the Phase 1 installations is to identify the locations with the highest petroleum contamination in the smear zone, & use that information in combination with the GW flow direction to narrow down the potential location of the unknown source. Six direct-push borings (CG112-SB01 to CG112-SB06) & one monitoring well (CG112-MW01) will be installed along two transects perpendicular to GW flow direction across the known area of smear zone contamination. All soil & GW samples will be analyzed for GRO, DRO, RRO, petroleum-related volatile organic compounds (VOCs), & lead. A limited subset of soil & GW samples (generally from locations of strong petroleum contamination) will also be analyzed for PAHs, VPH, & EPH. Soil & GW samples from the suspected source area will also be analyzed for the full suite of VOCs (low-level). During Phase 2, information collected during Phase 1 will be use to further guide placement of wells & borings to determine the location of the source of petroleum contamination & to further define the extent of contamination. Up to two GW monitoring wells (CG112-MW02 & CG112-MW03) will be installed to the northeast of CG112-MW01 (upgradient) along the estimated GW flow path in an attempt to locate the source of contamination. All soil & GW samples collected during the well installations will be analyzed for GRO, DRO, RRO, petroleum-related VOCs, & lead. A limited subset of soil & GW samples (generally from locations of strong petroleum contamination) will also be analyzed for PAHs, VPH, & EPH to characterize the source. Up to two additional monitoring wells (CG112-MW04 & CG112-MW05) may be installed to determine the extent of GW contamination to the southwest. Up to four additional soil borings (CG112-SB07 to CG112-SB10) may be installed to further define the extent of soil contamination in the smear zone perpendicular to GW flow. All soil & GW samples will be analyzed for GRO, DRO, RRO, petroleum-related VOCs, & lead. See site file for additional information. | Louis Howard |
| 4/11/2016 | Site Added to Database | A new site has been added to the database | Mitzi Read |
| 6/12/2018 | Update or Other Action | Draft Site Characterization report received for review. The extent of petroleum contamination has been delineated, except to the west where it overlaps with CG527. Estimated volume of soil from the main source area is 1.9 acres (830' long x 100' wide x 25' deep). GRO is a contaminant of concern in soil and groundwater. RRO, 1,1,2,2-tetrachlorethane, 1,2,4-trimethylbenzene, 1-methylnaphthalene, ethylbenzene, naphthalene, trichloroethylene and lead are contaminants of concern in water. However, the chlorinated contamination is from the overlapping site SS022 groundwater plume. See site file for additional information. | Louis Howard |
| 7/16/2018 | Document, Report, or Work plan Review - other | Staff commented on the draft site characterization report. Main comments were regarding the use of a bailer for collecting volatile organic compound samples and the loss of volatiles which will bias the sample result low. GRO, RRO, ethylbenzene, 1-methylnaphthalene, naphthalene, TCE and 1,2,4-trimethylbenzene exceed Table C cleanup levels in groundwater and also exceed the migration to groundwater cleanup levels, they are also contaminants of concern in soil. These contaminants had to have migrated through the soil in order for there to be observable impacts to groundwater. See site file for additional information. | Louis Howard |
| 7/19/2019 | Site Characterization Report Approved | Responses to comments on Site Characterization Report for CG112 - Wewak were satisfactory. ADEC approved the document. | Louis Howard |
| 4/12/2021 | Document, Report, or Work plan Review - other | DEC submitted comments on Draft JBER Basewide UFP-QAPP dated February 2021. | William Schmaltz |
| 5/19/2021 | Document, Report, or Work plan Review - other | DEC Reviewed and approved of Basewide Uniform Federal Policy - Quality Assurance Project Plan. QAPP summarizes general activities for a 5 year period on JBER. | William Schmaltz |
Contaminant Information
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Control Type
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Requirements
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No associated sites were found.