From: HOOD Robert * DEQ
Sent: Tue Oct 26 08:53:50 2021
To: Jeff Jackman
Subject: 5917 Pacific Coast Industrial Laundry-DEQ Comments
Importance: Normal
Jeff. DEQ reviewed PSS’s Phase I ESA and DEQ’s 2015 expanded preliminary assessment. DEQ agrees with PSS’s recommendations to conduct a limited subsurface investigation (soil and soil vapor), which should include a geophysical survey to search for abandoned underground storage tanks (USTs) and former UST excavations. Below other observations/conclusions from DEQ’s review:
· Dry cleaner chemicals were detected in indoor air samples during DEQ’s 2015 investigation work, but below occupational screening levels. Benzene and ethylbenzene were greater than occupational screening levels. In the sub-slab samples, benzene was less than occupational screening levels. DEQ concluded it was likely that benzene detections were from site operations and not related to subsurface environmental releases.
· With the exception of one sample (PC-4 and 91,000 ug/m3), TPH soil gas results were below urban residential screening levels. However, this result is below the occupational screening level for inhalation from soil gas, which is the current site use.
· Please locate and identify sanitary/storm drains lines, other utility lines, and other features of potential environmental concern where releases may have occurred or that may act as preferential contaminant pathways. Please also show the above and following features on a figure(s): stormwater drains to adjoining roadways and catch basin in the paved storage yard (?north side of site), parts washer in the tool repair area, drainage hole in boiler room floor, iron gate (west side of building somewhere), and tool repair area.
· If the site is redeveloped for urban residential use, additional investigation is needed to determine the nature and extent of sub-slab soil gas exceedances and potentially soil remediation based on the investigation results. The owner can do this now and further evaluate for urban residential pathway or agree to an EES/NEC if they still fail for this pathway and do not want to do this work now.
· Drinking water is not apparent. At this time, DEQ does not see the need for going to ~164’ to collect groundwater samples. After new soil data is collected, we can see what the new soil sampling results indicate, and determine whether or not additional soil and/or groundwater sampling is necessary.
· Please indicate when the natural gas boiler was removed.
All the above information should be put into a report (along with earlier data) with investigation work and a full human health and ecological risk evaluation should be completed. Please provide a work plan for your upcoming work along with the figures that show all other areas of potential concern so we can maximize your upcoming investigation work. –Rob
Robert A. Hood, Jr.
Natural Resources Specialist 4
Oregon DEQ
700 NE Multnomah Street, Ste. 600
Portland, OR 97232
Office (503) 229-5617-Note* I am not working in the office until further notice, please call my Cell (503) 860-9661 or email me.