April 4, 2017
To date, the remedial excavation of Source Areas 3, 6-11 have been completed and backfilled.
Work on Source Areas 1, 2 and 4 have been commenced. Additional excavation is required at Source Area 2 based on endpoint data, and additional work is needed at SA-1 (following underground storage tank removal – see below) and SA-4 (pending waste classification approvals as this area was noted to contain cosmetic debris).; Source Area 5, based on review of all soil pre-characterization data reviewed and approved by the NYSDEC, does not require soil excavation and off-site disposal.
All Source Area removal work is completed in accordance with the RAWP and the Scope of Work(s) finalized after NYSDEC and HDR review and approval. The CAMP monitors (minimum of 5) were all active during remediation and no elevated levels were observed during Source Area removal, or any other work (including grading or other soil movements) . On several occasions, additional CAMP monitors were used to monitor work activities conducted in two areas of the site concurrently.
Monitoring in and around each Source Area and grading work– with NYSDEC and HDR staff being present on-site – also did not note anything unusual in terms of instrument readings or significant odors. Source material and debris were observed (SA-3, SA-4) and appropriately removed, containerized, and are awaiting appropriate off-site disposal. As part of the Source Area scope, some additional testpit work will be conducted to evaluate if more source material is present in shallow soils at the site.
On March 15th, the Village issued a Grading permit for additional site work. This includes importing materials and screening on-site surface soils for possible use as backfill for remediated Source Areas. Even though the surface soil screening is only to depths of approximately 6” to 2 or 3 ft. below grade, air monitoring at these work locations and the necessary number of CAMP stations have been and will remain active.
Two 2,000 gallon Underground Storage Tanks (UST’s) were uncovered in the northern section of SA-1 on March 6, 2017. Work to remove the remaining liquid from the tanks via a vacuum truck was conducted on Friday March 31st, a total of 2091 gallons of fuel / water-fuel mix were removed from the tanks for disposal. The tanks were removed from the ground and taken off-site for disposal/metal recycling on Monday, April 3rd. All work involving the USTs was performed by a licensed UST removal specialist in accordance with the NYSDEC and Westchester County Department of Health (WCDOH) regulations.
On Friday, March 31st a permit was issued, after NYSDEC and HDR review and approval of a work scope, for an on-site Pilot Test to evaluate the proposed Micropiling procedures in the building footprint. Field observations during this 3-5 day pilot will dictate final review, conditions, and approval for the micropile and foundation scope of work. Pilot test to commence the week of April 3rd. All work monitored by NYSDEC and HDR and CAMP stations will remain active around the pilot work.