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ATTACHMENT A <br />FIELD AND LABORATORY PROCARES <br />Chevron Service Station 9-2033 508 west Charter Way, Stockton, CA <br />Health and Safety <br />As required by the Occupational Health and Safety Administration (OSHA) Standard <br />"Hazardous Waste Operations and Emergency Response" guidelines (29 CFR <br />1910.120), and by California Occupational Health and Safety Administration <br />(Cal -OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR <br />Title 8, Section 5192), SECOR will prepare a Site -Specific Health and Safety Plan for <br />use during fieldwork. The field staff and contractors will review the Site -Specific <br />Health and Safety Plan before beginning field operations at the site. <br />CPT Borings and Groundwater Sampling <br />The CPT soil borings will be advanced using a direct push cone penetrometer testing <br />(CPT) rig. Borings will be logged by CPT. Discrete groundwater samples will be <br />collected in selected intervals based on stratigraphy and field analytical data. Samples <br />will be collected using a hydro -punch and a stainless steel or Teflon bailer lowered into <br />accumulated groundwater in each boring, then retrieved and transferred into laboratory <br />supplied containers. The sample containers will be placed on ice for transport to the <br />laboratory accompanied by chain -of -custody documentation. Down -hole boring and <br />sampling equipment will be steam -cleaned prior to and following the completion of <br />each soil boring. Down -hole sampling equipment will be washed in a tri -sodium <br />phosphate or AlconoxTM solution between samples. <br />Exploratory Drilling <br />The soil borings will be drilled using an 8 -inch hollow -stem auger drilling equipment to <br />depths to be determined by field logs. A SECOR representative using the Unified Soil <br />Classification System and standard geologic techniques will log continuous samples <br />from each boring. Soil samples for logging will be collected continuously using either a <br />5 -foot dry core or using a California -modified split -spoon sampler. The sampler will be <br />driven a maximum of 18 inches using a 140 -pound hammer with a 30 -inch drop. All <br />soil samples for chemical analysis will be retained in brass liners, capped with Teflon <br />squares and plastic end caps, and sealed in clean zip -lock bags. The samples will be <br />placed on ice for transport to the laboratory accompanied by chain -of -custody record. <br />Down -hole drilling and sampling equipment will be steam -cleaned prior to and <br />following completion of each sample interval. <br />Laboratory Procedures for Soil Samples <br />Selected soil samples collected will be analyzed for the presence of TPHg and methanol <br />by EPA Method 8015, BTEX, and MtBE, DIPE, TAME, EtBE, TBA, EDB, 1,2 -DCA, <br />and ethanol by EPA Method 8260B. <br />