... Unified School District’s Chemical Hygiene Program (http://www.lausd-oehs.org /chemical- hygiene.asp) allows only approved chemicals to be used in school laboratories. Controlling what chemicals ... procedures, and record-keeping requirements. • Establish a district-level chemical purchasing policy, chemical products evaluation process, and a district-approved chemicals and products ... | 4 Chemical Management Resource Guide for School Administrators II. Hazardous Chemicals and Products in Schools II.A. Chemicals and Products of Concern Approximately 75,000 chemical...