Laserfiche WebLink
Soil Vapor Survey Workplan Clarification <br /> Moore Petroleum Bulk Plant,5491 F Street,Banta,California <br /> Page 2 <br /> non-reactive sampling probe is inserted into the soil to a prescribed depth. . . . Whole-air <br /> sampling is typically accomplished using an evacuated Summa or equivalent canister or by <br /> evacuation to a Tedlar bag". Pertinent parts of these documents have been included as Appendix <br /> C. <br /> Soil gas samples will be obtained through shallow driven points, approximately five feet below <br /> ground surface (bgs). Areas where concrete or asphalt is encountered will require the use of a <br /> Roto Hammer prior to sample collection. Once the area is cleared, a slam bar or impact driver <br /> will drive a %2 inch hole; to a depth of 18 to 24 inches. A clean vapor extraction rod will be <br /> inserted into the hole and driven to the desired depth, approximately five feet bgs. Once the rod <br /> has been inserted, bentonite will be placed around the surface to create a vapor barrier between <br /> the ambient air and the vapor point sample. A sample pump will be connected to the vapor probe <br /> and used to draw three purge volumes of air through the rod prior to collecting the sample in a <br /> Tedlar bag. <br /> One purge volume is estimated as the volume of the soil vapor probe (radius of 0.25 inches and <br /> 6 feet length) and the volume of the sample tubing (radius 0.125 inches and 3 feet length) for a <br /> total purge volume of 0.01 cubic feet. An SKC universal pump model number 224-PCXR4 will <br /> be used to draw the sample at a flow rate of 200 milliliters per minute (ml/min). After a <br /> minimum of 1.4 minutes or three purge volumes have been collected, a photo ionization detector <br /> (PID) will be used to record field concentrations. Once field concentrations reach a maximum <br /> level, an air sample will be collected. If no concentrations are present after seven purge volumes <br /> have been obtained, a sample will be collected. Once it has been determined that a sample will <br /> be collected, a Tedlar bag will be connected to the sample pump and a sample will be collected. <br /> Once sampling has been completed, the probe will be withdrawn and decontaminated according <br /> to Apex's SOP prior to the next sample location. <br /> Samples will be collected in a Tedlar sampling bag. Soil vapor probe samples will be submitted <br /> under chain of custody(COC) to a State certified analytical laboratory for analysis of total <br /> petroleum hydrocarbons as gas (TPHg), benzene, toluene, ethyl benzene, and total xylenes <br /> (BTEX). Five oxygenates, methyl tertiary butyl ether(MTBE), tertiary butyl alcohol (TBA), Di- <br /> isopropyl ether(DIPS), ethyl tertiary butyl ether(ETBE), tertiary amyl methyl ether(TAME), <br /> 1,2-dichloroethane, and ethylenedibromide will also be sampled for by EPA Method 8260B <br /> RESULTS REPORT <br /> Upon completion of the soil vapor survey, Apex will prepare a results report documenting the <br /> results. <br />