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' > Continuous Core Sampling <br /> Soil sampling beyond 5 feet bgs is conducted in accordance with ASTM 1586-84 Using <br />' this procedure, a 4-inch outside diameter split spoon sampler or a 4 inch inside diameter <br /> California -type sampler is driven into the soil simultaneously and at the same depth as <br />' the drill bit advances As these tools are advanced, the sampling barrel collects the <br /> sample This sampler is then retrieved while the hollow stem augers remain in place, <br /> protecting the integrity of the hole A new sampler is lowered into place, and advanced <br /> further to collect the next sample interval This process continues until a desired depth <br />' has been reached <br /> Upon recovery, a portion of the soil sample is placed into a plastic bag and sealed for <br />' later screening with a photo ionization detector (PID) Another portion of the soil sample <br /> is used for classification and description <br /> The soil sample is collected, labeled, and handled according to the Quality Assurance <br />' Plan A geologist from ENSR continuously logs (if required) each borehole using the <br /> Soil Classification Method Section during advancement and constantly checks soil <br /> samples for indications of first recognizable occurrence of groundwater <br />'. Soil Classification <br /> As the samples are obtained in the field, they are classified by the geologist in <br />' accordance with the Unified Soil Classification System (USCS) Representative portions <br /> 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 <br /> strata, and pertinent information regarding the method of maintaining and advancing the <br />' borehole are made <br />' Soil Sample Screening <br /> A porton of the soil sample from each sample tube is placed in a resealable plastic bag <br /> After the vapors in the soil samples are allowed to equilibrate with the air in the <br /> the <br /> within the Ian rain re --re scrnene d <br /> heaaspace of ane plastic Days, u�� organic vapors ������n .ham „�au�ra.r� u... �....,........ <br /> with a flame ionization detector or photo ionization detector The sample bag is opened, <br /> and the detector probe immediately placed within the headspace of the bag The <br /> highest observed reading is recorded This number provides a relative comparison of the <br /> Ivolatile organic compounds concentration with the soil samples but is not quantitative <br /> The field readings are recorded on the boring logs <br />