Laserfiche WebLink
vi/ frr/ <br /> Work Plan for Temporary Soil Vapor Probes Boyett Petroleum-Manteca <br /> June 17, 2008 419 S. Main Street,Manteca, Cali ornia <br /> • Three volumes of air will be purged from the sample tubing before collecting the <br /> vapor sample. <br /> i <br /> • Summa canisters with vacuum gauges will be used instead of Tedlar bags for VOC <br /> sample collection. <br /> • A regulator will be used to collect the vapor samples at 100-200 milliliters/minute <br /> (ml/min) flow rate to inhibit partitioning or short-circuiting (-25-30 minutes for a 6 <br /> i <br /> liter Summa canister or —4-8 minutes for a 1 liter Summa canister, assuming 20 <br /> percent vacuum will be left in the canister). <br /> • Per the guidance outlined in the Interstate Technology and Regulatory Council Vapor <br /> I <br /> Intrusion Pathway: A Practical Guideline in Appendix D Section D.10, an additional <br /> outdoor air sample will be collected to characterize site-specific outdoor air <br /> background conditions. The outdoor air sample will be collected upwind and away <br /> from wind obstructions such as trees and buildings. The intake will be approximately <br /> 3 to 5 feet from ground surface and 5 to 15 feet away from the on-Site building. <br /> • The samples will not be chilled(they will be discarded if condensation is observed in <br /> the sample tubing). <br /> 2.5 Soil Vapor Sampling Analysis <br /> i <br /> The soil vapor samples will be transported under chain of custody to Air Toxics of Folsom, <br /> California. The samples will not be kept on ice. Samples will be analyzed by EPA Method <br /> TP-14A or TO-1,5 for benzene, toluene, ethylbenzene and total xylenes (BTEX), methyl <br /> tertiary butyl ether (MTBE), ethyl tertiary butyl ether (ETBE), di-isopropyl (DIPE), tertiary <br /> amyl methyl ether (TAME); tertiary butyl alcohol (TBA) and ethanol and by EPA Method <br /> TO-3 for TPHg. In addition, 02, CO2 and methane will be analyzed by ASTM-1946 <br /> ensuring that reporting limits are below typical atmospheric concentrations of these gases. <br /> i ! The samples will also be analyzed for isopropyl alcohol by EPA Method TO-15 to evaluate <br /> �+ whether leaks may have been present in the tubing run during sampling. <br /> Page 6 of 8 Closure Solutions,Inc <br />