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Angelica Sandoval Marin [EH] From: Angelica Sandoval Marin [EH] Sent: Wednesday,January 07, 2015 2:50 PM To: Lang, Sherrie (Sherrie.Lang@arcadis-us.com) Subject: Re: 6100 N. Hwy 99 Sherri, I am emailing you in regards to the equipment blank data that was submitted for this site. I have discussed the method of how the equipment blank was taken with DTSC and wanted to inform you what was related to me. An equipment blank can be collected (prior to collecting the soil gas sample) by assembling the entire soil gas assembly and before doing the purge volume test, collecting air from within the entire assembly that would include pressure gauges, three-way values, ferrules, and hardware used to connect the assembly. Only the dead air within the assembly should be collected in a Summa canister and analyzed for the same constituents as the soil gas samples. Since the probe and tubing have already been tested, the only parts yet to be checked would be the connectors (hardware such as bolts, ferrules, etc.). This technique is true equipment blank, because you are actually testing all the parts that will be used during the soil gas sample. You can perform this equipment blank prior to the sampling date on January 13 or perform the equipment blank on the same day of the soil gas sampling event in addition to the soil gas sample. If an official/true equipment blank is not done, we may pick up a contaminant in the sample that is unexplainable. Nonetheless, if you do and something shows up, we can trace it back to the equipment blank and determine that it came from the equipment blank and not the sample. Please relate this to your technician, Wayne and have him call me if he needs clarification. Thanks Angelica Angelica Sandoval Marin,Senior REHS San Joaquin County, Environmental Health Department 1868 E. Hazelton, CA 95205 (209)468-2807 desk (209)468-0341 fax Email: amarin0sicehd.com 1