HomeMy WebLinkAboutDU20 Email Summary 06162025From:Jason Williams
To:Ota, Christopher A CIV USN NAVFAC SW SAN CA (USA)
Cc:Michael K. Klosky; Mike Sargent; Jake Lippman; Ray Velazquez; Courtney Bigelow; Jim Bob Rodriguez; Karl
Milinkovic; G. Thompson; Henry Moreno
Subject:[Non-DoD Source] Tustin Air Monitoring Summary 06-23-25
Date:Thursday, June 26, 2025 10:03:41 AM
Good morning, Chris.
Please find below an update of events for 06/23 8am to 06/24 8am:
Bainbridge performed air monitoring ( 7am to 7pm) at 9 stations throughout the day and
analytical sampling at one station.
1. The 24-hr TWA (from 06/23/25 to 06/24/25, 8am-8am) for PM10 concentrations
from the DustTraks were as follows:
Around the immediate vicinity of the hangar (DU-01,08,10A,12) ranged from
16.05 mg/m3 to 21.99 µg/m3
Around the outer perimeter and community (DU-13,14,15,16,20) ranged from
18.22 mg/m3 to 33.62 µg/m3
2. Community sample from DU20 collected today for laboratory analysis and will
be reported in subsequent emails once results are available. Samples received
from 06-09 through 06-17 and no asbestos was detected in any of the samples
analyzed for those dates. Sample received for 06-08 and 1 fiber of asbestos was
detected in the sample analyzed for that date.
3. Containment samples for CU-05A collected today for laboratory analysis and
will be reported in subsequent emails once results are available. Samples
received from 06-09, 06-11, and 06-17 and no asbestos was detected in any of
the samples analyzed for those dates. Samples received from 06-10, 06-12, 06-
13, and 06-14 and asbestos was detected in the samples analyzed for those
dates (Below the 70 fiber threshold).
4. Other observations for the day included:
Prevalent wind on the site once wind speeds were at or above 5 mph came from the
southeast, east and south and ranged from 0 to 25 mph as recorded by the weather station
attached to DU01A