Laserfiche WebLink
Standard Operating Procedures <br /> Subsurface Soil Sampling using Direct <br /> Push Technology Methods <br /> • Thread the sampler onto the drive head. <br /> 4.3.2 Sampling <br /> • Using the percussion/probing machine, drive the sampler into the ground until the drive head reaches <br /> the ground surface. <br /> • For deeper samples, the borehole walls must remain stable. The cutting shoe is designed with a <br /> tapered surface to limit sidewall scraping. Add additional probe rods until the sampler reaches the <br /> targeted sample interval,then drive the sampler through the desired sample interval. <br /> • Use the machine hydraulics to pull the sampler from the borehole. <br /> 4.3.3 Sample Recovery <br /> • Once the sampler has been removed from the borehole,the sampler must be unthreaded from the <br /> drive head, the cutting shoe unthreaded from the sampler, and the liner/shoe assembly removed from <br /> the sample tube. <br /> • Disconnect the cutting shoe from the liner which contains the soil sample. The recovered soil sample <br /> may now be viewed, logged, and extracted from the liner for analysis(refer to Section 4.5 for sample <br /> containment procedures). <br /> 4.4 Sampling Procedures— Large Bore Sampler <br /> (Note:These procedures are excerpted from GeoprobeTM Systems literature. This SOP assumes that the <br /> subcontractor will perform sampling;therefore, detailed procedures regarding sample acquisition are not <br /> provided. Additional detailed sampling procedures for this specific item of equipment is presented in <br /> GeoprobeTM Technical Bulletin No.93-660, appended to this SOP.) <br /> 4.4.1 Sampler Preparation <br /> • Decontaminate the sampler parts (cutting shoe, piston rod/tip, sample tube, liners) before assembly. <br /> • Assemble the sampler by first placing the liner on the cutting shoe,then threading the liner/shoe <br /> assembly into the sample tube, then connecting the piston tip to the piston rod, and then finally <br /> inserting the piston tip/rod assembly into the sample tube. Tighten the cutting shoe with the shoe <br /> wrench. <br /> • Thread the sampler onto the drive head. Thread the stop-pin onto the drive head (stop-pin holds the <br /> piston tip/rod in place while driving the sampler to the desired sample interval). <br /> • Sampling <br /> Page 8 of 14 <br />