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AECOMStandard Operating Procedure DPT Groundwater Sampling • A surface pump attached to a Teflon sampling tube. • A stainless steel mini-bailer lowered through the sampler pipe. • A Hydropunch®-type sampler. 2. Collect the required samples as specified below. a. Fractions of the groundwater sample should be collected in the following order: i. VOCs ii. SVOCs iii. Unfiltered inorganics iv. Filtered inorganics v. Water quality parameters b. During sample collection, allow the water to flow directly down the side of the sample container without allowing the tubing the touch the inside of the sample container or lid, in order to minimize aeration and maintain sample integrity. Sample containers are specified in the sampling and analysis plan. c. Collect samples for volatile organics first. The sample vial must contain no air bubbles after it has been capped; ensure this by turning the vial upside down and tapping it lightly. If any bubbles are observed, discard the sample and collect a new sample. d. Fill the remaining sample containers at least 3/4 full for all other analyses. e. Preserve the samples in accordance with the QAPP. 3. If a situation arises in which the groundwater recharge is too slow to allow for efficient immediate sampling, install a temporary PVC standpipe for sampling at a later time. This well, however, must be installed according to the following specifications: • The well will be narrower in diameter than the DPT borehole,leaving annular space around the casing. • The well will be installed between 2 and 5 feet into the water table. • New PVC casing and pre-cleaned screen will be used. • Installation of standpipe will be conducted while wearing decontaminated gloves. • If left unattended or overnight, locking well caps should be used, or a seal should be used that can indicate tampering. 4. When the groundwater has recharged enough to allow sample collection,collect samples from the temporary well using a disposable bailer,peristaltic pump, or submersible pump. Follow the sample collection and preservation procedures described above in Step 2. 5. Complete the sample labels accurately and legibly and affix to the sample bottles. Package sample bottles in sealable plastic bags and store on ice prior to shipping. Follow labeling procedures described in AECOM SOP No. 02, and packaging procedures described in AECOM SOP.No.08.