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• � Page 1 of 2 <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Thursday, April 10, 2014 1:37 PM <br /> To: 'bmillman@advgeoenv.com' <br /> Subject: RE: Main Street Investments-601 Main Street, Stockton, CA-Approval letter dated 3-11-14 <br /> Attachments: QA-QC for soil gas sampling and analysis.pdf <br /> Hi Brian, <br /> In response to question Number 1 below, the answer is"yes". <br /> I have appended two pages from Advisory-Active Soil Gas Investigation, dated April 2012, published <br /> by California EPA DTSC, LA Regional Water Quality Control Board and SF Regional Water Quality Control <br /> Board. Section 6.3.2 of the appended information explains the differences between collecting a duplicate <br /> sample verses collecting a replicate sample. Please collect a duplicate sample in a Summa canister and <br /> analyze the sample for TPH-g, BTEX, MTBE, ETBE, TAME, DIPE, TBA, EDB, 1-2-DCA and IPA. Please collect a <br /> replicate sample when collecting the TO-17 sample and analyze the sample for naphthalene, TPH-d and TPH- <br /> mo. <br /> In response to question Number 2 below, the answer is"yes". Analyze the trip blank for naphthalene, TPH-d <br /> and TPH-mo. Please refer to Section 6.3.1. of Advisory-Active Soil Gas Investigation concerning trip blanks. <br /> In response to question Number 3 below, a material blank tests the soil gas probe, tip and tubing <br /> assembly to determine if materials used for soil gas sampling contain any of the contaminants of concern. For <br /> this reason, the material blank should be analyzed prior to soil gas sampling. Please refer to Section 6.3.1. <br /> of Advisory-Active Soil Gas Investigation concerning material blanks. <br /> Please do not hesitate to contact me if you are still unclear about the conditions listed in the EHD letter dated 11 <br /> March 2014. <br /> Thanks, Brian, for asking. <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: vmccartnev(dsicehd.com <br /> t <br /> y <br /> From: Brian Millman [mailto:bmillman@advgeoenv.com] <br /> Sent: Thursday, April 10, 2014 10:18 AM <br /> To: Vicki McCartney [EH] <br /> Subject: Main Street Investments - 601 Main Street, Stockton, CA - Approval letter dated 3-11-14 <br /> Hi Vicki, I have a couple questions regarding the conditions in the work plan approval letter, <br /> dated 11 March 2014, for Main St Investments. <br /> 1. Condition#3 states to collect one duplicate soil gas sample and analyze the duplicate for <br /> 4/10/2014 <br />