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r r <br /> SAMPLING METHODS AND FIELD PROCEDURES <br /> This attachment describes procedures to be followed by ADR Environmental Group, Inc. <br /> (ADR), during collection of samples of subsurface soil. Sampling procedures were based on <br /> sampling guidance documents from the American Society of Testing and Materials (ASTM) and <br /> the California Environmental Protection Agency, Department of Toxic Substances Control <br /> (DTSC). <br /> A. EXPLORATION BORING/SOIL AND GROUNDWATER SAMPLING PROCEDURES <br /> Soil sampling will be performed under the direction of an ADR geologist. The soil borings will <br /> be advanced using truck-mounted direct push drilling (DP) techniques as specified in the <br /> project Work Plan. DP soil samples will be collected from each soil boring at 4 feet or less bgs <br /> as the borings are advanced with a "large bore"sampler containing a 4-foot long acrylic tubing <br /> liner. The bottom portion of the recovered sample tubing will be retained for possible <br /> laboratory analysis; other sections of the samples will be used for soil description (in <br /> accordance with the guidelines of ASTM D-2487-85) and PID screening. <br /> Soil samples, retained for possible chemical analysis, will be immediately placed in an ice <br /> chest (cooled to approximately 4° Celsius) awaiting transport to a state certified analytical <br /> laboratory. Sample custody procedures outlined in Section C of this attachment will be <br /> followed. <br /> The DP soil sampling assembly will be cleaned to prevent contamination across sampling <br /> intervals using procedures described in Section B. Any soil generated from the soil borings will <br /> be stored in 55-gallon drums (unless otherwise directed by agencies or the client) or other <br /> appropriate containers and labeled with the corresponding boring number, date, and address <br /> of the facility. <br /> B. DECONTAMINATION AND DISPOSAL PROCEDURES <br /> All equipment that comes into contact with potentially contaminated soil, drilling Fluid, air, or <br /> water will be decontaminated before each use. <br /> Drilling and sampling equipment will be decontaminated as follows: <br /> 1. Drill rig rods and samplers will be washed with a TSP solution prior to use and between <br /> borings. Visible soil, grease, and other impurities will be removed. <br /> 2. Soil sampling equipment will be washed with a TSP solution prior to use and between <br /> each boring. Prior to individual sample collection, any sampling device will also <br /> cleaned in a TSP solution and rinsed twice in clean water. Any visible soil residue will <br /> be removed. <br /> B.1 Buried Utility Locations <br /> Prior to commencement of work on site, ADR will contact the appropriate utility companies or <br /> contract with a private locator to have underground utility lines located. ADR will also visually <br /> survey the site to estimate the locations of potentially unmarked underground utilities. <br /> B.2 Lithologic Logging <br /> Logs of soil conditions encountered during the drilling and sample collection will be maintained <br /> using the ASTM D-2487-85 classification system by an ADR geologist. <br /> The collected soil samples will be examined and the following information recorded: boring <br /> location, sample interval and depth, color, soil type, moisture content (qualitative), and depth <br /> at which groundwater (if present) is first encountered. Also recorded on the soil boring logs <br /> will be the field screening results derived from the use of a portable PID. <br />