Laserfiche WebLink
J <br /> Field Practices and Procedures <br /> Page 3 <br /> Generally two soil samples from each soil boring will be submitted for chemical analysis <br /> unless otherwise specified in the scope of work. Soil samples selected for analysis <br /> typically represent the highest PID reading recorded for each soil boring and the sample <br /> just above first-encountered groundwater. <br /> Stockpiled Drill Cuttings and Soil Sampling <br /> Soil generated during drilling operations will be stockpiled on-site. The stockpile will be <br /> set on and covered by plastic sheeting in a manner to prevent rain water from coming in <br /> contact with the soil. Prior to collecting soil samples, Stratus personnel will calculate the <br /> approximate volume of soil in the stockpile. The stockpile will then divided into sections, <br /> if warranted, containing the predetermined volume sampling interval. Soil samples will <br /> be collected at 0.5 to 2 feet below the surface of the stockpile. Four soil samples will be <br /> collected from the stockpile and composited into one sample by the laboratory prior to <br /> analysis. The soil samples will be collected in cleaned brass, two by six inch tubes using <br /> a band driven sampling device. To reduce the potential for cross-contanlination between <br /> samples, the sampler will be cleaned between each sampling event. Upon recovery, the <br /> sample container will be sealed at each end with Teflon sheeting and plastic caps to <br /> minimize the potential of volatilization and cross-contanlination prior to chemical <br /> analysis. The soil sample will be labeled, placed on ice, and delivered to a state-certified <br /> analytical laboratory, along with the appropriate chain-of-custody documentation. <br /> Direct Push Technology, Water Sampling <br /> A well known example of direct push technology for water sampling is the Hydropuncho. <br /> For the purpose of this field method the term hydropunch will be used instead of direct <br /> push technology for water sampling. <br /> The hydropunch is typically used with a drill rig. A boring is drilled with hollow stem- <br /> augers to just above the sampling zone. In some soil conditions the drill rig can push <br /> directly from the surface to the sampling interval. The hydropunch is conveyed to the <br /> bottom of the boring using drill rods. Once on bottom the hydropunch is driven a <br /> maximum of five feet. The tool is then opened by lifting up the drill rod no more than <br /> four feet. Once the tool is opened, water enters and a sample can be collected with a <br /> bailer or tubing utilizing a peristaltic pump. Soil particles larger than silt are prevented <br /> from entering the tool by a screen within the tool. The water sample is collected, labeled, <br /> and handled according to the Quality Assurance Plan. <br /> Monitoring Well Installation <br /> Monitoring wells will be completed by installing 2 to 6 inch-diameter Schedule 40 <br /> polyvinyl chloride (PVC) casing. The borehole diameter for a monitoring well will be a <br /> minimum of four inches larger than the outside diameter of the casing. The <br /> 2-inch-diameter flush-threaded casing is generally used for wells dedicated for <br /> groundwater monitoring purposes. <br /> WField Practices\Field P and P with CPT for Joes-revised 07-2004 by SJC.doc <br />