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Limited Phase II Site Assessment Work Plan <br />239 West 11 th Street <br />Tracy, California <br />Project No. 2E-1108004 <br />Page 5 <br />3.1.2. Soil Field Screening and Analysis <br />A replicate portion of each soil sample will be placed in a resealable container for field <br />screening. A PID equipped with the appropriate lamp based on the ionization potential <br />of the residual VOC vapors will be utilized. Screening results from the PID are <br />registered in parts per million (ppm) based on an isobutylene standard which is <br />referenced to the ionization potential of benzene. Screening results will be noted on <br />Records of Subsurface Exploration. The PID will be calibrated on a daily basis. The <br />field staff will maintain a log of daily calibration that will be included as part of their field <br />documentation. Replicate samples, intended for laboratory analysis will not be used for <br />PID screening. <br />Based on the results of the PID field screening and/or the specifications of the work plan, <br />replicate soil samples will be selected for laboratory analysis. Soil samples will be <br />submitted to Accutest Analytical Testing Corporation (Accutest), located in San Jose, <br />California, for analysis. Giles proposes that five (5) select soil samples collected from <br />the Geoprobe® borings be submitted. The chemical analysis will include TPH-CC <br />(8015B); and VOCs (8260B). <br />3.2. Groundwater Sampling Methods <br />3.2.1. Temporary Wells and Sampling <br />Giles will install three of the soil borings to temporary wells and collect groundwater <br />samples. The samples will either be obtained through dedicated tubing and a peristaltic <br />pump, or a disposable polyethylene bailer. Groundwater samples will be submitted to <br />Accutest for analysis. Three (3) groundwater samples will be analyzed for VOCs. <br />3.3. Decontamination procedures <br />Field decontamination procedures for direct -push sampling equipment will be implemented <br />to provide representative samples by reducing the potential for cross -contamination <br />between sampling locations. The cutting shoe at the time of the direct -push sampling <br />device will be cleaned and decontaminated between successive samples and the entire <br />sampling device including core barrel and shoe will be cleaned and decontaminated <br />between successive boring locations. If additional decontamination techniques are required <br />(i.e. methanol, deionized water, or nitric acid rinses), they will be specified in the work plan <br />for the field event. <br />Disposable polyethylene tubing will be used for sampling temporary wells. This tubing will <br />not be used between successive samples. <br />GILES ENGINEERING ASSOCIATES, INC. <br />