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CA ARNG Field Quality Assurance Project Plan - bailer is used to control sample flow into sample containers for samples collected for volatile and semivolatile analyses; other samples are collected by carefully decanting the water into sample containers. Sample containers for volatile organic compound analyses and other applicable parameters are pre -preserved. VOC samples will be collected first, followed by SVOCs, inorganics, and finally water quality samples. 9.1.5.20 All groundwater sample containers are pre -chilled at 4'C prior to filling to minimize volatilization and reduce any reactions with the preservatives. All appropriate measures are taken to obtain representative water samples and avoid loss of volatiles in wafer samples. Extraction Well Sampling 9.1.5.21 Extraction wells are sampled using in-line influent and effluent spigots to purge the water first and then to collect water samples. The equipment required for extraction well sampling includes: • Water level, pH, temperature, SC, and turbidity meters; and • Plastic buckets. HydroPunch® Sample Collection 9.1.5.22 The HydroPunch® is a groundwater sampling tool that allows collection of water samples from precise depths without installation of a monitoring well. The HydroPunch® H sampler has a 2 -inch OD and is 5 feet in length. A disposable polypropylene or PVC screen (S feet long) is attached to a disposable tip. The screen and internal parts of the tool are sealed from the exterior by an O-ring seal at the base of the cone when the -tool is in the closed -position. The screen and cone will be inserted into the body of the HydroPunch® and advanced to the desired sample depth below. The body of the tool is pulled back, exposing the intake screen to formation groundwater. When groundwater enters the sampler, a small diameter bailer is lowered through the casing and body of the tool into the screened zone for sample collection. HSA 9.1.5.23 Using HSA drilling, the HydroPunch® will be advanced to a depth approximately 2 to 4 feet below the water table .inside an HSA boring drilled to fust encountered groundwater. Groundwater °samples will be bailed from the HydroPunch® tool and handled as described in Section 9.1.9. Ground- water samples will be transferred to laboratory -prepared sample bottles, labeled, and placed immediately into a chilled cooler for storage and transport to an off-site laboratory. The samples will be stored and shipped as described in the QAPP. 9.1.5.24 HydroPunch® holes will be backfilled with neat cement grout to prevent aquifer cross -contamination contamination from occurring. A tremie pipe will be used to fill the hole from bottom up. If the hole collapses and the tremie cannot be advanced into the hole, a hollow drill rod equipped with a sacrificial trip can be forced back down the original hole and used as a tremie. All sampling locations in asphalt surfaces will be topped off with cold -patch asphalt to existing grade. A permanent identification marker will be installed at the HydroPunch® location. field QAPP.DOC 9-9 May 2000