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PFAS Sampling Guidance <br />IV. SAMPLING ACTIVITIES <br />Become thoroughly familiar with sample collection and shipping requirements before proceeding <br />to the site to collect water samples. Ensure adequate sample containers are on hand to sample <br />each site, including the trip blank and one field blank per site. <br />Keep clear and precise written field records. Implement the methods described in this <br />document conscientiously and consistently. Departure from these procedures requires <br />documentation in the field notebook. <br />All samples shall be collected directly from a sample tap on the well discharge line, with the well <br />operating and at a location prior to any treatment. The well should be flushed to waste at least <br />15 minutes before sample collection. <br />Use of a laboratory accredited to analyze for PFAS using EPA Method 537.1 or EPA Method <br />537 Revision 1.1 is required for samples reported to the Division of Drinking Water. A list of <br />laboratories accredited by the California Environmental Laboratory Accreditation Program <br />(ELAP) can be found at this internet site: <br />httos://www.waterboards.ca.gov/drinking water/certlic/drinkinowater/PFOA PFOS.html <br />AVOID SAMPLE CONTAMINATION <br />PFAS compounds are detected at very low levels (parts per trillion). Therefore, there could <br />be materials used by the sampler, or present at the sampling site, that could contaminate <br />the sample. All persons involved in the sampling event should refrain from the use of the <br />following products at least 24 hours prior to the sampling event and until the samples <br />have passed to the next person in the COC: <br />• Do not use 24 hours prior to sample event: <br />o Cosmetics, moisturizes, sun blocks, fragrances, creams, or other personal care <br />products (including hair products) <br />o Pre-packaged food, fast food or items wrapped in aluminum foil <br />o New or unwashed clothing <br />o Clothing washed with fabric softeners or dried with anti -static sheets <br />• Other items that are likely to contain PFAS and need to be avoided include: <br />o Teflon@ and other fluoropolymer containing materials <br />o Glass bottles, waterproof /treated paper on field notebooks <br />o Waterproof markers (such as Sharpie@, etc.) <br />o Adhesive paper products (such as Post -It @Notes or scotch tape) <br />19E-23 <br />