1. (a) At all sites that are subject to Env-Or 600, the responsible party shall:

   1. (1) Monitor groundwater quality at all sites to ensure that groundwater quality complies with the terms of the permit, if any, and the groundwater quality criteria specified in Env-Or 603.01, after accounting for seasonal, atmospheric, and hydrogeologic variability;
   2. (2) Monitor surface water points and water supply wells to ensure that water quality complies with applicable water quality standards and the terms of the permit, if any;
   3. (3) Monitor sampling points in the remediation or treatment system to ascertain that design treatment efficiencies are achieved;
   4. (4) Install at least one hydraulically upgradient groundwater monitoring well to monitor ambient groundwater quality; and
   5. (5) Operate and maintain the monitoring wells, piezometers, and other measurement, sampling, and analytical devices so that they perform to design specifications throughout the life of the monitoring program.
2. (b) The parameters to be monitored shall be determined on a site-specific basis depending on the regulated contaminants present in the discharge or contaminated area.
3. (c) The frequency and location of water quality monitoring shall be determined on a site-specific basis depending on the hydrogeologic and contaminant characteristics of the site, predicted rates of groundwater flow, and treatment methods employed.
4. (d) The frequency and location of soil sampling locations shall be determined on a site-specific basis depending on the source of discharge, geologic and contaminant characteristics of the site, site uses, and treatment methods employed.
5. (e) The frequency and location of soil vapor or indoor air sampling locations shall be determined on a site-specific basis depending on the source of discharge, hydrogeologic and contaminant characteristics of the site, site uses, predicted rates of groundwater flow, and treatment methods employed.
6. (f) Analyses shall contain information necessary to make the determinations specified in Env-Or 609.02(a), (c), and (d) and shall be performed by a laboratory certified by the U.S. Environmental Protection Agency (US EPA) or the department pursuant to Env-C 300.

7. (g) Sampling shall be performed in accordance with the following references, available as noted in Appendix B, as applicable:

   1. (1) “Practical Guide for Ground-Water Sampling,” document identification number EPA/600/2-85/104, US EPA, dated September 1985;
   2. (2) “RCRA Ground-Water Monitoring: Draft Technical Guidance,” document identification number PB87107751, US EPA, dated November 1992;
   3. (3) “Standard Guide for Sampling Ground-Water Monitoring Wells,” ASTM D4448-01 (2019);
   4. (4) “Standard Guide for Selection of Passive Techniques for Sampling Groundwater Monitoring Wells,” ASTM D7929-20, dated 2020;
   5. (5) “Compendium of Methods for the Determination of Toxic Organic Compounds in Ambient Air, Second Edition” document identification number EPA/625/R-96/010b, US EPA, dated January 1999;
   6. (6) “SW 846 Test Methods for Evaluating Solid Waste, Physical/Chemical Methods”, US EPA, dated 2020; and
   7. (7) “Standard Guide for Sampling Waste and Soils for Volatile Organic Compounds” document identification number ASTM D4547-20, dated 2020.

Source. (See Revision Note at chapter heading for Env-Or 600) #8812, eff 2-1-07; ss by #10831, eff 6-1-15; ss by #14419, eff 11-4-25, EXPIRES: 11-4-35