From: HAFLEY Dan * DEQ

Sent: Tue Jan 25 15:59:27 2022

To: HANSON Don * DEQ; LEIDEL Alyssa * DEQ

Subject: FW: Camp Adair and COUTES QAPPs

Importance: Normal

 

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FYI

From: HAFLEY Dan * DEQ

Sent: Wednesday, July 14, 2021 1:25 PM

To: FARRIS Ann M * DEQ <ann.m.farris@deq.state.or.us>

Subject: Camp Adair and COUTES QAPPs

Ann –

A few comments on each of the two documents:

Draft Final Site Inspection UFP-QAPP Addendum, Camp Adair

  1. DEQ discourages the collection of discrete samples for reconnaissance-level sampling, in particular for surface soil where composite samples can be easily obtained. We recommend the collection of five-point composites whenever possible. For Camp Adair, DEQ recommends composite sampling, at a minimum, for soil sampling locations -04 and -05.
  2. Groundwater sample locations -06 through -08 are based on the assumption that groundwater flow is to the northeast. DEQ presumes that during the forthcoming site visit, the appropriateness of the (downgradient) locations will be confirmed. We also understand that an attempt will be made to survey groundwater elevations during field work to confirm groundwater flow direction.
  3. In reviewing/screening soil sampling results, DEQ recommends that risk-based levels for the protection of groundwater be considered to the extent available.

 

Draft Final Site Inspection UFP-QAP Addendum, Central Oregon Unit Training Equipment Site (COUTES)

  1. See Comment #1 above for Camp Adair. We recommend that surface samples from both AOI 1 and AOI 2 be collected as composites to provide greater areal coverage. See also Comment #3 regarding screening of soil sampling results.
  2. DEQ recommends that a composite sediment sample be collected from the three catchbasins in AOI 1 and analyzed for PFAS, the purpose being to qualitatively assess the potential for historical releases of PFAS. This recommendation is consistent with DEQ’s Guidance for Evaluating the Stormwater Pathway at Upland Sites (2009, updated 2010). Data from this sampling will be helpful in assessing whether PFAS releases have historically occurred, in particular if cleanout of the catchbasins has been infrequent or has not occurred.

 

Also, we understand that for both sites, investigation-derived waste will be stored at the respective facilities. We recommend that you consult with DEQ prior to final disposal.

Respectfully,