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Page 1 of 4 <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Friday,June 20,2014 4:10 PM <br /> To: 'Brian Millman' <br /> Cc: Nuel Henderson [EH] <br /> Subject: RE: Collecting a material blank <br /> Good afternoon Brian, <br /> I have reviewed the proposal to use a disposal polyethylene vapor implant with speed-fit fitting and Teflon tubing to <br /> collect soil gas samples at Main Street Investors located at 601 Main Street in Stockton. One thing that I would like to <br /> change is the flow rate from 100 mL per minute to 50-66 mL per minute when using sorbent tubes to sample for the TO- <br /> 17 analytes. <br /> What do you mean by'pre-hydrated bentonite"will be placed above the dry bentonite from 8 feet bsg to near surface? <br /> I question whether the leak detector, isopropyl alcohol, can be used for the TO-17 method. Will you please check with <br /> the laboratory to confirm this? <br /> Thanks, Brian. <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Phone: (209)468-9852 <br /> Email: vmccartney(asicehd.com <br /> From: Brian Millman [mailto:bmillman@advgeoenv.com] <br /> Sent: Monday,June 16, 2014 2:15 PM <br /> To: Vicki McCartney [EH] <br /> Cc: Nuel Henderson [EH] <br /> Subject: RE: Collecting a material blank <br /> Hello Vicki/Nuel, <br /> I apologize for the delay with this project since last speaking with you and Nuel. I have been <br /> reviewing soil-vapor sampling investigations that we have performed over the past year. Over <br /> the past year we have performed several vapor investigations using a new procedure to collect <br /> soil-vapor samples. The new procedure consists of a sampling train with less components and <br /> a much reduced chance of cross-contamination or contamination from the sampling materials. <br /> Because documentation is required to demonstrate that the equipment being used for <br /> collecting soil gas samples do not contain any contaminants of concern, AGE would like to <br /> addend the procedures for soil-vapor sampling that were proposed in the AGE-prepared, Site <br /> Assessment and Vapor Intrusion Investigation Work Plan, dated 11 February 2014. The <br /> addendum is proposed for two reasons: 1) to update the procedures and equipment now being <br /> used by AGE to collect soil-vapor samples and 2) to provide documentation from current soil- <br /> vapor investigations to demonstrate that the equipment being used does not contain any <br /> contaminants of concern. <br /> 6/20/2014 <br />