Skip to Main Content
U.S. flag

An official website of the United States government

You are here:
Contact Us

Property Details for Surface Water and Groundwater Sampling - Hansville Landfill


On this page:


Legal Notices

Profile Information

Government
260708
31912 Little Boston Rd NE KINGSTON, WA 98346
1303
Multiple Parcels; Kitsap County
47.852077986045 / -122.569224006761
6
Morales, Susan
Morales.Susan@epa.gov
206-553-7299


Top of Page

Property Location



Top of Page

Property Progress


Top of Page

CAs Associated with this Property

CA NameCA #StateTypeAnnouncement Year
Port Gamble S'Klallam TribeBF01J86201WAAssessment2020


Top of Page

Assessment Activities at this Property

ActivityEPA FundingStart DateCompletion DateCAAccomplishment Counted?Counted When?
Phase II Environmental Assessment$47,745.2406/12/202409/30/2024Port Gamble S'Klallam TribeYFY25


Is Cleanup Necessary? Yes
EPA Assessment Funding: $47,745.24
Leveraged Funding:
Total Funding: $47,745.24


Top of Page

Climate Adaption and Mitigation - Planning or Assessment

There is no data for Climate Adaption and Mitigation - Planning or Assessment.


Top of Page

Contaminants and Media


Other Contaminants
NOT Cleaned up
Ground Water
Surface Water
NOT Cleaned up
NOT Cleaned up


Top of Page

Cleanup Activities

There are no current cleanup activities.


Cleanup/Treatment Implemented:
Cleanup/Treatement Categories:
Addl Cleanup/Treatment info:
Address of Data Source:
Total ACRES Cleaned Up: 1303
Number of Cleanup Jobs Leveraged:
EPA Cleanup Funding:
Leveraged Funding:
Cost Share Funding:
Total Funding:


Top of Page

Climate Adaption and Mitigation - Demolition or Cleanup

There is no data for Climate Adaption and Mitigation - Demolition or Cleanup.


Top of Page

Institutional and Engineering Controls

U
U


Top of Page

Redevelopment and Other Leveraged Accomplishments

There are no current redevelopment activities.


Number of Redevelopment Jobs Leveraged:
Actual Acreage of Greenspace Created:
Leveraged Funding:


Top of Page

Climate Adaption and Mitigation - Redevelopment

There is no data for Climate Adaption and Mitigation – Redevelopment


Top of Page

Additional Property Attributes

The scope of work for Stantec's surface water and groundwater sampling was designed to assess
potential impacts from contaminated groundwater migration from the Hansville Landfill onto the PGST
Reservation. To accomplish these objectives, the scope of work as outlined in the SAP included the
following:
* Collection of three surface water samples from two locations on Middle Creek (SW-01 and SW-02),
also located on the PGST Reservation. This included two primary samples and one field duplicate.
One primary surface water sample was located near the headwaters of the creek (SW-02), and a
second primary surface water sample was collected near the terminus of the creek (SW-01). Surface
water samples were submitted to the project laboratory for PFAS and PCBs analysis.
* Collection of three groundwater samples from two groundwater monitoring wells (MW-13D and MW-
12I) associated with the landfill's monitoring well network and located within the boundaries of the
PGST Reservation. This included two primary samples (one from each monitoring well) and one field
duplicate. Groundwater samples were submitted to the project laboratory for PFAS and PCBs
analysis.

Based on the analytical results of this sampling event Stantec has identified the following:
* PFAS were detected in the surface water and groundwater samples collected during this sampling
event:
? One PFAS analyte (PFOA) was detected in the surface water sample from SW-02 (collected at
the headwaters of Middle Creek) at a concentration of 5.2 ng/L that exceeded the applicable most
stringent screening level (EPA MCL of 4.0 ng/L).
? The groundwater sample collected from monitoring well MW-12I had detected concentrations of
three PFAS analytes PFOA, perfluorononanoic acid (PFNA), and perfluorooctanesulfonic acid
[PFOS] that exceeded their applicable most stringent screening levels. Specifically this included
PFOA at a concentration of 47 ng/L (EPA Tap RSL of 0.0027 ng/L), PFNA at a concentration of
7.9 ng/L (EPA Tap RSL of 5.9 ng/L), and PFOS at a concentration of 88 ng/L (EPA Tap RSL of
0.20 ng/L).
* The analytical results appear to suggest that the Hansville Landfill may be a source of PFAS
contamination.
* PCBs (Aroclor compounds) were not detected in any of the surface water or groundwater samples
collected during this sampling event.
* The equipment blank and field blank samples had no detections.
* Data validation completed as part of this sampling event indicated that the surface water and
groundwater analytical data are of known and acceptable quality as qualified, based on regulatory
and laboratory-established control limits and the data quality objectives of the project.

Based on the findings of this sampling event, Stantec recommends additional investigation to delineate
the nature and extent of PFAS contamination in surface water and groundwater at the PGST Reservation.
This should include collecting additional surface water and groundwater samples within the boundaries of
the PGST Reservation as well as from the existing monitoring well network associated with the Hansville
Landfill. In addition, Stantec recommends preparing an updated conceptual site model for the PGST
Reservation that incorporates contaminant migration from the adjacent Hansville Landfill and PFAS as a
confirmed contaminant of concern.


Top of Page

Release 3.0.2