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28 December 2018 AGE Project No. 18-4574 Page 9 of 12 AdvancedGeo Environmental Centers for Disease Control and Prevention, or the National Institute of Occupational Safety and Health. The California Methamphetamine Contaminated Property Cleanup Act of 2005 (Chapter 6.9.1, Section 25400 of the California Health and Safety Code) outlines criteria for the assessment and cleanup of properties affected by clandestine drug laboratory activity. Specifically, the Property Cleanup Act of 2005 established a State Re -Occupancy Criteria of 1.5 micrograms of methamphetamine per 100 square centimeters (1.5 pg/100 cm2). Surfaces where methamphetamine contamination is detected at concentrations above this threshold must be remediated until additional sampling indicates the methamphetamine concentrations on remaining surfaces are below the threshold. 4.1 SAMPLING PROTOCOLS Sampling protocols for samples will be in adherence to EHD requirements. Collected samples will be enclosed in tamper resistant containers, tracked via chain of custody form and shipping tracking documentation, and shipped via courier. 4.1.1. Types and Methods of Wipe Sampling The "Proposed Surrogate Method" as devised by Bruce Lazarus, CIH, will be used when collecting samples. The Surrogate Method consists of a limited number of samples taken from selected locations representative of the clandestine laboratory site and production method associated with the site. For this reason, samples will be analyzed for methamphetamine and not the main constituents of manufacturing. A single discrete wipe sample will be collected from a 100 cm2 surface area at each sampling location. Methanol will be applied to a sterile gauze wipe and that wipe will be passed across the sampling area multiple times in multiple directions, horizontally and vertically, in a "z" or "n" pattern. The sample will then be placed in a uniquely labeled screw down container. Composite samples are collected in the same method, except several 100 cm2 areas are sampled or multiple wipe samples are composited at the laboratory for analysis. 4.1.2. Sampling Equipment Sampling equipment includes: screw top sampling container, methanol, sterile gauze wipes, chemical protective gloves and 100 cm2 template. Reusable tools and the sample template will be cleaned and decontaminated after each use in accordance with EHD requirements. Disposable supplies will be used once and discarded.