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30 January 2019 AdvancedGeo <br />AGE Project No. 18-4574 Environmental <br />Page 3 of 7 <br />2.2.1. Types and Methods of Wipe Sampling <br />The "Proposed Surrogate Method" as devised by Bruce Lazarus, CIH, was used during <br />collection of samples. The Surrogate Method consists of a limited number of samples <br />taken from selected locations representative of the clandestine laboratory site and <br />production method associated with the site. For this reason, samples were analyzed for <br />methamphetamine and not the main constituents of manufacturing. <br />A single discrete wipe sample was collected from a 100 -square centimeter surface area <br />at each sampling location. Alcohol was applied to a sterile gauze wipe and that wipe was <br />passed across the sampling area multiple times in multiple directions, horizontally and <br />vertically, in a "z" or "n" pattern. The sample was then placed in a uniquely labeled screw - <br />cap container. <br />2.2.2. Sampling Equipment <br />Sampling equipment included: screw -cap sampling container, alcohol, sterile gauze <br />wipes, chemical protective gloves and 100 square centimeter template. <br />Reusable tools and the sampling template were cleaned after each use, in accordance <br />with EHD requirements. Disposable supplies were used once and discarded. <br />2.2.3. Analytical Laboratory and Methodology <br />The collected wipe samples were analyzed by a CDPH certified analytical laboratory. <br />Wipe and water samples were analyzed for methamphetamine using Liquid <br />Chromatography Mass Spectrometry (LC/MS). <br />2.2.4. Quality Assurance and Control <br />A blank wipe sample was submitted for laboratory analysis of methamphetamine for <br />quality assurance and control purposes. <br />2.3. SAMPLING RESULTS AND DISCUSSION <br />A total of sixteen (16) discrete samples were collected from the common rooms of the <br />residence. A total of six (6) composite samples were collected from auxiliary rooms within <br />the residence. Sample locations are depicted in Figure 3. <br />The EHD indicates that methamphetamine levels below 1.5 pg/100cm2 are safe for <br />human occupancy. <br />