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IV. DISCUSSION OF RESULTS <br /> At present, "acceptable" limits for residual methamphetamine and iodide concentrations <br /> have not been established by the Occupational Safety and Health Administration <br /> (OSHA), the Environmental Protection Agency (EPA), the California Department of <br /> Health Services (DHS), the Centers for Disease Control and Prevention (CDC), or the <br /> National Institute of Occupational Safety and Health (NIOSH). NES utilizes guidelines <br /> for interpreting the clandestine laboratory sampling results compiled from the following <br /> sources: <br /> 1. Guidelines for Contamination Reduction and Sampling at Illesal Druiz <br /> Manufacturing Sites. Washington State Department of Health, Office of <br /> Toxic Substances. <br /> 2. Guidelines for Cleaning Up Former Methamphetamine Labs. Missouri <br /> Department of Health and Senior Services. <br /> I Clandestine Laboratory Contaminated Properties: Assessment and <br /> Remediation Strategies, Bruce Lazarus, CIH. Journal of Clandestine <br /> Laboratory Investigating Chemists,V.10,No.2, April 2000. <br /> 4. Criteria for the Assessment and Remediation of Clandestine <br /> Methamphetamine Laboratories. County of Sacramento, Environmental <br /> Management Department. <br /> Historically, NES has used phosphorous and chlorine data as an indicator of possible <br /> contamination and interprets the data with caution. NES places greater emphasis on <br /> methamphetamine and iodine results as the key indicators of residual contamination. <br /> Thus, NES looks for significant increases in phosphorous and chlorine levels obtained <br /> as compared to prior control and post-remediation data as evidence of possible residual <br /> contamination associated with methamphetamine production. In prior sampling events <br /> conducted by NES over approximately seven years, NES has seen chlorine levels <br /> ranging from 0-150 gg/wipe and phosphorous levels ranging from 0-500 µg/wipe in <br /> control and post-remediation sampling locations. Note: these are general data ranges <br /> and do not necessarily represent contamination thresholds as both chlorine and <br /> phosphorous are common in household cleaning products and may be found in varying <br /> levels throughout a residence based on location and cleaning applications applied. <br /> Based on recent County of Sacramento data interpretation guidance, NES used a non- <br /> BFC Properties 8 NETWORK ENVIRONMENTAL SYSTEMS,INC.m <br /> Preliminary Site Assessment NES Project Number 04-261 <br /> 26237 Miller Avenue, Escalon, California <br />