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t . <br /> Appendix 8 <br /> Drilling and Sampling Procedures <br /> The procedures that were used for drilling the borings and collecting groundwater samples are <br /> presented below <br /> G An encroachment permit for the field investigation was obtained from the <br /> California Department of Transportation prior to the fieldwork <br /> o A drilling permit was obtained from the San Joaquin County Environmental <br /> Management Department <br /> Drilling Methods <br />' o Two soil borings were advanced to a depth of 30 5 meters (100 feet) below the <br /> ground surface (BGS) using CPT sampling equipment <br /> • All drilling and sampling equipment was washed prior to drilling In addition, the <br /> tprobe casing, probe tips, screen, and bailer were decontaminated by steam <br /> cleaning between each sample <br /> G Wastewater generated during the field activities were contained in 208-liter (55- <br /> gallon) United Nations approved drums The drums were stored at the site <br /> pending laboratory analysis <br /> Groundwater Sampling Procedures <br /> a Field activities were recorded on field report forms <br /> • The groundwater samples were collected from Hydropunch-type sampling <br /> equipment using either a new disposable polyethylene or Teflon bottom-valve <br /> bailers, stainless steel bailer <br /> • Polyethylene bailers were discarded after each sample was collected The <br /> stainless steel bailer was washed prior to sampling <br /> • New nylon rope was used to lower the bailers into the wells The nylon rope was <br /> discarded after each well <br /> • Groundwater samples were placed into laboratory-supplied containers containing <br /> the appropriate preservatives, as needed <br /> • Discharge to the containers was conducted in a manner to minimize bubbling and <br /> agitation of the liquid The containers were filled to the top forming a meniscus <br /> to rruninuze the headspace <br /> k1fQTodminyNWaOPL-X2wWJai&%M7 seeeoc B-1 <br />