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10 May 2019 AdvancedGeo <br /> AGE Project No. 18-4574 Environmental <br /> Page 5 of 7 <br /> 4.1.1. 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 /> 4.1.2. Sampling Equipment <br /> Sampling equipment included: screw-cap sampling container, alcohol, sterile gauze <br /> wipes, chemical protective gloves and 100 square centimeter template. Disposable <br /> supplies were used once and discarded. <br /> 4.1.3. Analytical Laboratory and Methodology <br /> The collected wipe samples were analyzed by a CDPH certified analytical laboratory. <br /> Wipe samples were analyzed for methamphetamine using Liquid Chromatography Mass <br /> Spectrometry (LC/MS). <br /> 4.1.4. Quality Assurance and Control <br /> A blank wipe sample was submitted for laboratory analysis of methamphetamine for <br /> quality assurance and control purposes. <br /> 4.2. WASTE STREAM DISPOSAL <br /> All waste stream materials, including wastewater, will be disposed of at an EHD approved <br /> landfill. A waste disposal manifest is included as Appendix A. <br /> 4.3. POST ABATEMENT SAMPLING RESULTS <br /> 04 April 2019 - Initial post-abetment sampling <br /> After decontamination of all areas, discrete post abatement wipe samples were collected <br /> from the following locations (Figure 4): <br />