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NOVA <br /> CONSULTING <br /> technique. Physical evidence of any unusual odors or staining will be recorded on the field <br /> log. <br /> The headspace technique consists of half-filling a quart sized zip-lock bag with a soil <br /> sample and quickly sealing the bag. Headspace development proceeds for between 10 to <br /> 20 minutes. The bag is shaken vigorously for 15 seconds,at both the beginning and the end <br /> of the headspace development period. After headspace development, the bag is opened <br /> slightly and the PID probe is inserted to one-half the headspace depth. The highest reading <br /> observed on the PID will be recorded. The PID readings will be on the boring logs. <br /> 2.4 Laboratory Chemical Analyses <br /> One soil sample will be submitted for analysis from each of the shallow interior borings. <br /> One soil sample will be submitted for analysis from each of the deeper exterior borings. <br /> One groundwater sample will be obtained from each of the exterior borings. <br /> The soil and groundwater,samples will be submitted to the laboratory for analysis of VOCs. <br /> The samples will be placed into laboratory-supplied containers, stored in a cooler under <br /> refrigerated conditions, and transported to Environmental Science Corporation (ESC) in <br /> Mount Juliet, Tennessee using chain-of-custody procedures. ESC is certified to analyze <br /> environmental samples collected in the State of California. <br /> WORK PLAN PAUL'S CLEANERS AT RALEY'S STOCTON <br /> PAGE 4 NOVA PROJECT NO.B13-0472 <br />