Arsenic removal from the former Hakalau Plantation Pesticide Mixing Site (aka Poison Mixing Shed and Seed Dipping Facility) on Hakalau Point:
During a County Finance Committee hearing on June 2, 2016, Steve Shropshire, principal of the Shropshire Group, LLC, which owns Hakalau Point, described the arsenic contamination at the site:
You may know that this is one of the highest concentrations of arsenic on the island and maybe the State. It was the result of a seed dipping facility...part of the Hakalau Plantation Infrastructure. (video segment from 30:43-31:06)
Details on the final cleanup action, including a summary of public comments, can be found in the Final Removal Action Report prepared by Integral Consulting Group for the Hawai`i Department of Health, dated June 18, 2014. Included below is an excerpt from the conclusions and recommendations:
Four removal action alternatives (plus the No Action alternative) were evaluated in term of effectiveness, implementability, and cost. Alternative 5, Consolidation and Capping of Arsenic Category C and D Soils at Source Area ("Capping in Place"), was determined to be the optimal remedy. All other alternatives (2, 3 and 4) included significant excavation of arsenic-impacted soils from within the 40-ft shoreline setback adjacent to the cliff face, and were determined to be technically infeasible due to slope stability concerns. Upon approval of the recommended removal action alternative by HDOH, a removal action work plan will be prepared to provide design specifications and guidance in implementing the proposed remedy. (p. 8-1)
The 1956 Sanborn Map below shows the location of the Poison Mixing Shed on Hakalau Point.
The figure below illustrates the plan for "Capping in Place". Soil from areas of higher concentration of arsenic contamination will be consolidated in the area of highest concentration of contamination, i.e., the location of the former Poison Mixing Shed.
Below, the photo on the left shows the location of the poison mixing shed, the area of highest arsenic concentration. The photo on the right below illustrates the instability of the cliffs.
Aerial photo from 1967 showing the Poison Mixing Shed. Photo courtesy of Cal Motoda.
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July 2014 posting of Hakalau Point showing cliff failure in area of highest arsenic concentration. Actual date the photo was taken is unknown. Accessed via vimeo.com/100024063
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On December 27, 2017, the Planning Director approved an SMA Minor Permit for the landowner of Hakalau Point to consolidate and resubdivide two lots into two lots and establish a distillery, food manufacturing and processing operation, watchman's quarters, brewery, tasting room, restaurant, and related improvements including fencing of the arsenic contamination area, landscaping, and the "as-built" carport, as presented in SAA 17-001574, subject to the applicant's compliance with the conditions of approval. Two of the conditions attached to this Minor Permit are related to the arsenic remediation:
As of April 11, 2019, the Remediation Implementation Work Plan had not been submitted for approval to DOH HEER and there had been no word from the developer on exactly when the (approved) cleanup would begin. DOH HEER has asked the owner to ensure the site is not accessible for public use or to use temporary fencing as appropriate to limit access, and has also been advised to not closely mow the site (i.e. let vegetation grow up on site) to discourage use/access by the public, and limit opportunities for any bare dirt on the site. No soil is to be excavated or removed from the site before the cleanup plan is implemented.
- Prior to applying for Plan Approval, the landowner is required to submit a copy of the approved Hawaii Department of Health Hazard Evaluation & Emergency Response (HDOH HEER) Remediation Implementation Work Plan that addresses soil arsenic contamination.
- Prior to issuance of the Certificate of Occupancy, the landowner must submit HDOH HEER documentation that the proposed remedy has been completed. Further, lead contamination remediation, if applicable, must also be documented.
As of April 11, 2019, the Remediation Implementation Work Plan had not been submitted for approval to DOH HEER and there had been no word from the developer on exactly when the (approved) cleanup would begin. DOH HEER has asked the owner to ensure the site is not accessible for public use or to use temporary fencing as appropriate to limit access, and has also been advised to not closely mow the site (i.e. let vegetation grow up on site) to discourage use/access by the public, and limit opportunities for any bare dirt on the site. No soil is to be excavated or removed from the site before the cleanup plan is implemented.