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r <br /> r <br /> • <br />' hole A new sampler is lowered into place, and advanced further to collect the next sample <br /> interval This process continues until a desired depth has been reached <br /> rUpon recovery, a portion of the soil sample is placed into a plastic bag and sealed for later <br /> screening with a photo ionization detector (PID) Another portion of the sod sample is used for <br />' classification and description <br /> The soil sample is collected, labeled, and handled according to the Quality Assurance Plan A <br /> geologist from ENSR continuously logs (if required) each borehole using the Sail Classification <br /> Method Section during advancement and constantly checks sod samples for indications of first <br /> recognizable occurrence of groundwater <br /> Soil Classification <br /> As the samples are obtained in the field, they are classified by the geologist in accordance with <br /> the Unified Soil Classification System (USCS) visual and manual methods Representative <br /> portions of the samples are retained for further examination and for verification of the field <br /> classification Logs of the borings indicating the depth and identification of the various strata, <br /> and pertinent information regarding the method of maintaining and advancing the borehole are <br />� . made <br /> Soil Sample Screening <br /> A portion of the soil sample from each sample tube is placed in a resealable plastic bag After <br /> the vapors in the sod samples are allowed to equilibrate with the air in the headspace of the <br /> plastic bags, the organic vapors within the headspace are screened with a flame ionization <br /> detector or photo ionization detector The sample bag is opened, and the detector probe <br /> immediately placed within the headspace of the bag The highest observed reading is recorded <br /> This number provides a relative comparison of the volatile organic compounds concentration <br /> with the soil samples but is not quantitative The field readings are recorded on the boring logs <br /> WELL DEVELOPMENT <br /> This section describes the field and analytical procedures to be followed by ENSR throughout <br /> the investigation <br /> General Well Develo meat Procedures <br /> The water level and well depth is measured with a water level indicator and written on the well <br /> development record This information is used to calculate the volume of standing water (i e , the <br /> well volume) within the well <br /> E <br />