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SOP No. 240 <br /> Page 2 of 3 <br /> 2. EQUIPMENT <br /> A DPT rig will be used to conduct subsurface soil sampling activities. The DPT <br /> (Geoprobe®, PowerProbeTM or similar) device may be operated using a dual tube <br /> methodology which allows the collection of subsurface soil samples through an outer <br /> casing that is set to maintain the integrity of the boring. Using the DPT rig, borings are <br /> advanced by simultaneously driving an outer stainless steel casing and disposable inner <br /> Lexan tube into the ground. Upon reaching the desired penetration depth, the inner <br /> Lexan® tube is extracted to collect the discrete subsurface soil samples, leaving the <br /> outer casing in place. To sample the next interval of soil, a new length of Lexan® <br /> tubing is then inserted into the outer casing (already in the ground) attached to a length <br /> of drive pipe, and another length of outer casing is attached to the top of the outer <br /> casing that is already in the ground. The following materials should be available, as <br /> required, during the subsurface soil sampling: <br /> • equipment necessary for surface soil sampling(see SOP 200); <br /> • Personal Protective Equipment (PPE) and air monitoring equipment as required <br /> by the HASP; <br /> • DPT sampling equipment; <br /> • decontamination equipment per the QAPP and FSP; <br /> • measuring device; <br /> • photoionization detector(PID); <br /> • camera; and <br /> • field log book and forms as specified in other SOPS. <br /> 3. PROCEDURES <br /> The following procedures will be employed to collect subsurface soil samples: <br />