All pollutant analyses, including sampling techniques, shall be performed in accordance with the techniques prescribed in 40 CFR Part 136, unless otherwise specified in an applicable categorical pretreatment standard. If 40 CFR Part 136 does not contain sampling or analytical techniques for the pollutant in question, sampling and analyses must be performed in accordance with procedures approved by the EPA or the County. Unless otherwise specified by the County, data submitted to the County, except for flow, pH, temperature, and parameters used solely for internal process control, shall be prepared by a laboratory registered or accredited under the provisions of Chapter 173-50 WAC, and reports of pollutant analyses shall include a statement of compliance with this requirement.