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Page 1 of 2 <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Friday, January 21, 2011 2:49 PM <br /> To: 'Larry' <br /> Cc: 'Dinesh Rao'; 'Yarone(Ron) Madnick' <br /> Subject: RE: Work Plan for Soil Gas Collection <br /> Larry: <br /> The Department of Toxic Substances Control guidance document Interim Final- Guidance for the Evaluation and <br /> Mitigation of Subsurface Vapor Intrusion to Indoor Air, dated December 14, 2004, revised February 7,2005, <br /> recommends that ten percent of the soil gas samples collected in the field be confirmed with Summa canisters <br /> that are analyzed using TO-14A or TO-15. <br /> I do not understand why you are recommending the use of water standards by method 8260 to analyze <br /> these samples when these are air samples that should be analyzed using gaseous standards by either method <br /> TO-14 or TO-15. Please clarify. <br /> Vicki McCartney,Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Phone: (209)468-9852 <br /> Fax: (209)468-3433 <br /> Email: vmecartneyy&gcehd. om <br /> From: Larry [mailto:larryw@amiadini.com] <br /> Sent: Friday, January 21, 20112:15 PM <br /> To: Vicki McCartney [EH] <br /> Cc: 'Dinesh Rao'; 'Yarone (Ron) Madnick' <br /> Subject: RE: Work Plan for Soil Gas Collection <br /> Vicki, <br /> We would agree to add the following to the Description of the Work in the letter that was provided with the <br /> boring permit application: <br /> Duplicate Sampling <br /> The results of the field work utilizing a mobile laboratory will be independently confirmed through the <br /> collection of one duplicate soil gas sample in a 250 ml SummaTM canister. This duplicate sample will <br /> be analyzed using EPA Method 8260 in an off-site State-certified Environmental laboratory. The <br /> duplicate sample will be collected in an area where soil gas is suspected to be impacted with VOCs. <br /> We have added this statement to the permit letter, a copy of which is attached. <br /> We trust this will be acceptable. Please let us know should you require anything further. <br /> Sincerely, <br /> Larry Witwer <br /> 1/21/2011 <br />