Groundwater Sample Collection for VOC Analyses Sample Clauses

Groundwater Sample Collection for VOC Analyses. Samples for analysis of VOCs must be collected using a technique/ methodology that prevents analyte losses through volatilization. The sample collection procedure presented below includes preparing the test glass container (i.e., 40 -xX xxxx ) to verify that sample preservation is adhered to and to prevent volatilization . The preferred method for collecting g roundwater samples is the use of a bladder or submersible stainless-steel pump with capability of flo w rates of less than 100 milliliters per minute. RWQCB does not advocate the use of bailers when samples are being collected for VOCs analysis due to the likelihood of analyte losses . Use of bailers should be limited to those situations where use of a pump is not possible. The rationale for use of bailers must be documented in the facility -specific work plan for approval by RWQCB. When using the pump, groundwater samples are collected using a flow rate of 100 milliliters per minute or less . The groundwater is pumped directly into a vial containing two drops of hydrochloric acid . To reduce volatilization, the sample bottle is held at a 45-degree angle to the discharge to enable the groundwater to flow directly into the vial and down the side of the vial, whic h should prevent splashing and volatilization. As the vial fills, it is slowly turned to the vertical position. This step is continued until the vial is filled and a reverse meniscus develops at the top of the vial. Once this step is complete a Teflon™ septum is slid onto the top of the vial and cap. To verify that no headspace remains in side the vial , the vial is inverted to observe for bubbles. Note : bubbles smaller than the size of a small green pea are acceptable. When collecting samples using a xxxxxx, a Teflon xxxxxx or other suitable inert material with a bottom-emptying device must be used. The xxxxxx must be lowered into and removed from the well in a manner that causes as little agitation as possible. The bottom-emptying check valve must be used t o slowly discharge the sample from the xxxxxx into the sample vial so there is no agitation of the sample. Bailers must be decontaminated between samples , or disposable bailers must be used. At each groundwater well , a test vial will be prepared to determi ne whether sufficient preservative is being used. The VOC test sample is prepared in the manner identical to the field samples. Once the test vial is filled and capped, the vial is inverted and then opened and pH or litmus paper is...
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