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C ( ti Organic Vapor Monitoring Procedures Soil samples collected at 5400t depth intervals during drilling activities and hand augering will be analyzed in the field for ionizable organic compounds using a photo - ionization detector ( PID ) with a 10 . 2 ultra- violet ( UV ) lamp . The test procedure will involve measuring approximately 30 grams from an undisturbed soil sample , placing this sub -sample in a sealed container ( either a zip- lock bag or a mason jar) . The container will be warmed for approximately 20 minutes ( in the sun ) , then the head- space within will be tested for total organic vapor, measured in parts per million as benzene ( ppm ; volume/volume ) . The instrument will be calibrated prior to drilling using a 100 - ppm isobutylene standard ( in air) and a sensitivity factor of 55 , which relates the photo - ionization potential of benzene to that of isobutylene at 100 ppm . PID and FID readings are useful for indicating relative levels of contamination , but cannot be used to evaluate hydrocarbon levels with the confidence of laboratory analyses . Laboratory Procedures for Soil and Ground Water Samples Selected soil and water samples collected will be analyzed for total petroleum hydrocarbons as gasoline (TPHg ) and total petroleum hydrocarbons as diesel (TPHd ) , total petroleum hydrocarbons as motor oil (TPHmo) , and total petroleum hydrocarbons as jet fuel (TPHj ) by EPA Method 8015 , benzene , toluene , ethyl - benzene , xylenes ( BTEX) , and methyl tertiary butyl ether ( MtBE ) , by EPA Method 8260B . Soil Borings and Sampling The borings will be , logged by a SECOR representative using standard geologic techniques . Soil samples for logging will be , collected at five-foot intervals using a standard hand auger . A 6 - inch standard auger will be used to advance the soil borings to a depth of approximately 15 feet bgs . Soil samples collected for chemical analysis will be retained in brass sleeves , then sealed in clean zip= lock bags . The samples will be placed on ice for transport to the laboratory accompanied by chain - of-custody record . Down - hole drilling and sampling equipment will be steam - cleaned prior to and following completion of each sample interval . Temporary Well Installation and Sampling The borings will be converted to temporary groundwater monitoring wells by installing 24ch diameter , 0 . 010- inch slotted well screen in the bottom of the boring and threaded to blank pipe to extend above the ground surface . Groundwater samples will be collected using a dedicated polyethylene tubing and a peristaltic pump or a disposable bailer , placed into appropriate EPA- approved containers , labeled , placed on ice , and transported to a California State Certified laboratory accompanied by chain -of- custody documentation . Soil Cuttings and Rinsate Water Soil cuttings generated during drilling operations will be temporarily stored onsite and covered with plastic sheeting pending characterization and disposal . Soil cuttings will be removed by Chevron ' s disposal contractor to an appropriate disposal facility. Water generated during steam cleaning will be temporarily stored in DOT- approved 55- gallon drums pending transport by Chevron ' s disposal contractor to an appropriate disposal or treatment facility . Soil cuttings and rinsate water drums will be temporarily stored onsite for approximately 6 to 10 weeks .