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<br /> Lori Duncan [EH]
<br /> From: Arron Wilder [AWilder@clearwatergroup .com]
<br /> Sent: Friday, May 21 , 2010 2:23 PM
<br /> i To: Lori Duncan [EH]
<br /> Cc: Olivia Jacobs; Jim Jacobsl ; Jim Jacobsl ; John McCain ; Nuel Henderson [EH]
<br /> Subject: FW: ZB178A - Barnes Trucking , Soil Investigation May 2010 Summary
<br /> Dear Lori -
<br /> Following is a brief summary of the two-day soil and groundwater investigation that took place at the 1817 S.
<br /> Fresno Ave. , Stockton Site (Barnes Trucking). All soil borings were advanced to 32 feet bgs, continuously
<br /> logged , and samples were collected above, within and below the impacted zones, as observed in the field. A
<br /> grab groundwater sample was collected from each boring. Samples are being delivered to Kiff Analytical today,
<br /> May 20th , 2010 for 7-day turn-around time:
<br /> On Tuesday, May 18th, 2010, Clearwater Staff members arrived on-Site at 0930 and set up the Geoprobe rig at
<br /> the first soil boring , SB-16, which was located approximately 74 feet south of the tank cage and 3 feet from the
<br /> eastern-most fence. This boring was advanced to 32 feet bgs. PID and visual observations from this boring
<br /> indicated that no obvious impacts were present.
<br /> At 1200, SBA 7 was set up and advanced to 32 feet bgs . SBA 7 was located approximately 43 feet west of the
<br /> eastern property fence, approximately 20 feet south of SB-15. Observed lithologic information suggests that no
<br /> major impacts were present within soil encountered at this boring . This boring may define the southern boundary
<br /> of the sorbed-phase impacts, pending lab results.
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<br /> At 1445, SB-18 was set up and advanced to 32 feet bgs. SB-18 was located equidistant between the eastern
<br /> and western corners of the building on-Site, in the middle of the southern-facing wall , approximately 2 feet from
<br /> the wall . Impacts were observed , with the zones of greatest impacts present between 22 feet bgs and 26 feet
<br /> bgs with a high PID reading of 1 , 177 PPM . These impacts were defined vertically, using the PID and visual/odor
<br /> indications, pending lab results.
<br /> -0900 on Wednesday,ad y,May 1 in, 2010, SB-1 w� up approximately oximately(rfee et ast oflheGuirdmg ann 5 feet
<br /> north of the building's southeast corner. The PID was calibrated using 100 PPM isobutylene gas, and SB-19 was
<br /> advanced to 32 feet bgs. Impacts were noted with a PID reading of 3,308 PPM between 22 and 24 feet bgs, with
<br /> vertical definition mostly acheived at 32 feet (based on low PID detections), pending lab results.
<br /> At 1045, SB-20 was placed 20 feet north of SB-19, in line with SB-19, and advanced to define the area north of
<br /> SBA 9. This boring was advanced to 32 feet bgs. Impacts were noted at this boring between 24 and 28 feet bgs,
<br /> with a high PID reading of 1 ,717 PPM at 24 feet bgs. At 32 feet, impacts were observed to be decreased, borne
<br /> out with a relatively low PID reading. Vertical definition on this boring is expected to be achieved , pending lab
<br /> results .
<br /> At 1315, the final boring, SB-21 , was set up and advanced to 32 feet bgs. SB-21 was located approximately 25
<br /> feet north of the building , approximately 2 feet west of the western-facing wall of the building on-Site, in a location
<br /> presumed to be up/cross gradient from SB- 18. No impacts were noted within soil cores at SB-21 .
<br /> Please feel free to let me know if you have any questions regarding this summary information .
<br /> Best Regards,
<br /> i
<br /> Arron Wilder, CPSS #322410 Project Manager/Project Geoscientist
<br /> Clearwater Group
<br /> 229 Tewksbury Ave.
<br /> Point Richmond, CA 94801
<br /> 5/21 /2010 510-307-9943 ext. 236- office
<br /> 510-590- 1096 - cell
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