Protocol for the Collection, Transfer and ANSI/AARST MW-RN 2020 Measurement of Radon in Water 4 SECTION 3.0 FIELD OPERATIONS— PREPARE FOR COLLECTING WATER SAMPLES 3.1 Prepare to document testing Informative advisory —Proper documentation is critical and is part of any defensible Quality Assurance Plan (see AARST MS-QA Standard for Radon Measurement Systems Quality Assurance) . 3.2 Required documentation when collecting samples Information to be recorded for the testing of radon in water shall include all of the following: 3.2.1 Test purpose The reason or purpose for the sample collection and measurement shall be documented, with the intent to identify the purpose as initial, confirmatory, seasonal, or post-mitigation. 3.2.2 Collector and sampling method The name of the sample collector, the supplier of the collection device, and the method of collection shall be documented when a professional service is used. 3.2.3 Location and sampling information For every sample, an address and a description of exact location of the spigot used for sample collection, and the volume of water expelled prior to collection, shall be recorded. A description of water treatment and/or storage tanks prior to the sampling spigot shall be documented. 3.2.4 Collection date and times Due to the short half-life of radon, a sample collector shall record the exact water collection date and time for use in calculating the decay factor and radon concentration. 3.2.5 Water temperature - If water temperature is used to indicate a fresh water supply, identification of the device used to determine the temperature and the water temperatures immediately before and after the sample collection shall be recorded. - If the water temperature is not used to indicate a fresh water supply, the method used (such as measured or calculated volume) to assure fresh water shall be described. - When flushing holding tanks or water lines to obtain samples because there is no suitable faucet or spigot prior to the holding tank, the volume of water discarded shall be recorded. 3.2.6 Extenuating factors Discrepancies or peculiarities regarding sample collection (such as an aerator could not be removed, or bubbles formed in the sample vial) shall be recorded. 3.3 Preparation for sample collection, handling and shipping Persons collecting water samples are to: a) Prepare to take samples immediately after flushing water lines and holding tanks; b) Prepare to collect two water samples ( duplicates ) at a spigot in accordance with Section 4 ; c) Prepare to forward water samples to the laboratory immediately or within 24 hours as described in Sections 6.1 ; and d) Prepare to handle water samples with care for temperatures where stored and transported as described in Sections 6.2 and 6.3 . 3.4 Vacant building testing Sampling protocols for occupied and vacant buildings are to be identical. Note—Water measurements done at vacant buildings should be remeasured within 30 days of occupancy if the water supply has not supplied by a municipal treatment facility.