Laserfiche WebLink
• • Page 3 of 4 <br /> Upon achieving a successful leak test and allowing for 120 minutes of equilibration time, the <br /> purge canister valve will be opened for a calculated period of time to allow for three calculated <br /> volumes of air to be purged. The purge canister vacuum gauge will be monitored to ensure a <br /> proper decrease of vacuum ensuring flow and purging. The purge volume will be determined by <br /> calculating the internal volume of the tubing, vapor implant and the volume of sampling void. <br /> Upon achieving the targeted purge volume, the purge canister valve will be closed and the <br /> sample canister valve will be opened. The initial pressure and time will be recorded. Upon <br /> reaching at least -5 in Hg or less, the sample canister valve will be closed and final pressure <br /> and time recorded. The sampling port on the sampling canister will be capped with a brass <br /> end-cap. For TO-17 analysis, the low-flow pump will be activated and allowed to operate for <br /> approximately 40 minutes at 100 ml/min to recover approximately 4 liters of soil-vapor. The <br /> initial start time and completion time will be recorded and the sorbent tube will be capped with <br /> brass end-caps. <br /> The samples will be transported under chain-of-custody procedure to a CDPH-certified <br /> laboratory. Each sample canister and tube will be labeled with sample designation, time, date <br /> and sampler's initials and analyzed for the constituents listed in Section 2.3. Additionally, <br /> sorbent tubes will be placed in a chilled container for transport and include a trip blank for TO- <br /> 17. <br /> Vicki, with this new method of soil-vapor sample collection the only materials being used is the <br /> Polyethylene Vapor Implant with Speed-Fit Fitting and 0.25-inch diameter Teflon tubing. Both <br /> products we have been purchasing from Environmental Service Products (ESP): <br /> 1) The Polyethylene Vapor Implant is listed as Item # SVPT91-14 on the ESP website------- <br /> --------- http //www envservprod com/Polyethylene-Vapor-Implant-with-Speed-Fit-Fitting- <br /> P1932C5.aspx <br /> 2) The 0.25-diameter Teflon Tubing is listed as Item #T250TEF on the ESP website--------- <br /> -- http //www envservprod com/store/Teflon-Tubing-316-x-14-OD-per-foot-P24C5.asox <br /> Material Blank Case: <br /> hftps //qeotracker.waterboards.ca.gov/esi/ul)ioads/geo report/1991891086/T0608797961.PDF <br /> -In July 2013, AGE performed a soil-vapor investigation at Borina Orchards in Watsonville, CA. <br /> During the investigation a disposable Polyethylene Vapor Implant (# SVPT91-14) and 0.25- <br /> diameter Teflon Tubing ( #T250TEF) were used to collect soil-vapor samples from two borings <br /> into one-liter Summa canisters and four-liter sorbent tubes. The analytical lab report from the <br /> soil-vapor samples is attached; ethanol and IPA were detected in V-1 but all analytes tested for <br /> were ND in V-2; results from soil-vapor sample V-2 indicate that contaminants of concern were <br /> not detected from the vapor implant and Teflon tubing used during the sampling. <br /> Please don't hesitate to contact me with any questions or comments. <br /> Thanks, <br /> Brian W. Millman <br /> California Professional Geologist#8574 <br /> Advanced GeoEnvironmental, Inc. <br /> Stockton • Los Angeles • San Francisco Bay Area <br /> Monterey • Spokane • Seattle • Portland • Reno • Dallas <br /> 6/20/2014 <br />