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Angelica Sandoval Marin [EH] <br /> From: Hung,Wayne <Wayne.Hung@arcadis-us.com> <br /> Sent: Monday,January 12, 2015 10:08 AM <br /> To: Angelica Sandoval Marin [EH] <br /> Cc: Lang, Sherrie <br /> Subject: Equipment/material blank for BP-595, Stockton <br /> Attachments: IMG_0808.1PG; 1412110A_d.pdf <br /> Hi Angelica, <br /> Per our discussion today,the equipment blank(EB-12-8-14)collected on December 8, 2014, has fulfilled the <br /> requirement for both DTSC and San Joaquin County material blank.Attached is a picture of the equipment/material <br /> blank that I collected on 12/8/2014 in the Walnut Creek office. Per Eurofins Air Toxics Laboratory requirement, if we <br /> only collected the dead air inside of the Teflon tubing,the sample volume would not be sufficient for the lab to run the <br /> test.Therefore,we connected a canister filled with pure/lab graded nitrogen to the sampling canister with a flow <br /> controller,tee fitting,and Teflon tubing(same batch from the well installation).As we opened both nitrogen and <br /> sampling canisters,the sampling canister collected both the dead air in the tubing and the nitrogen from the nitrogen <br /> canister. Feel free and let me know if you have any additional questions or concerns. <br /> I will be on site tomorrow to collect the soil vapor samples starting 8 am. Feel free to stop by if you are interested to see <br /> how the samples are collected. <br /> Thanks! <br /> Wayne Hung I Environmental Engineer I wayne hung(&arcadis-us com <br /> ARCADIS U.S., Inc. 12999 Oak Road, Suite 300 1 Walnut Creek,CA,94597 <br /> Office:925-296-7852 Cell:650-492-3935 <br /> www.arcadis-us.com <br /> ARCADIS, Imagine the result <br /> Please consider the environment before printing this email. <br /> 1 <br />