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S ECOR <br /> Attachment 5 <br /> Field and Laboratory Procedures <br /> Organic Vapor Monitoring Procedures <br /> Soil samples were collected between 6 and 7 feet below ground surface (bgs) and were <br /> analyzed in the field for ionizable organic compounds using a photo-ionization detector <br /> (PID) with a 10.2 ultra-violet (UV) lamp. The test procedure involved measuring <br /> approximately 30 grams from an undisturbed soil sample, placing this sub-sample in a <br /> sealed container (either a zip-lock bag or a mason jar). The container was warmed for <br /> approximately 20 minutes (in the sun), then the head-space was tested for total organic <br /> vapor, measured in parts per million as benzene (ppm; volume/volume). The instrument <br /> was calibrated prior to drilling using a 100-ppm isobutylene standard (in air) and a <br /> sensitivity factor of 55, which relates the photo-ionization potential of benzene to that of <br /> isobutylene at 100 ppm. <br /> Laboratory and Sampling Procedures for Soil and Groundwater Samples <br /> Selected soil samples were analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg) by CA LUFT Gasoline method, total petroleum hydrocarbons as diesel (TPHd), <br /> total petroleum hydrocarbons as jet fuel (TPHj), and total petroleum hydrocarbons as <br /> motor oil (TPHm) by modified EPA Method 8015B , benzene, toluene, ethyl-benzene, <br /> xylenes (BTEX), and methyl tertiary butyl ether (MtBE) by EPA Method 8260B. <br /> Soil samples collected for chemical analysis were retained in brass sleeves, labeled, and <br /> capped with Teflon squares. Soil and groundwater samples were placed on ice for <br /> transport to a California state certified laboratory accompanied by chain-of-custody <br /> documentation. <br /> Waste Management <br /> Soil generated during excavation activities was temporarily stored onsite and covered <br /> with plastic sheeting or placed in DOT approved 55-gallon drums. Water generated <br /> during decontamination procedures was temporarily stored in DOT approved 55-gallon <br /> drums. Soil and rinsate water was transported by a Chevron disposal contractor to an <br /> appropriate disposal facility. <br />