1. (a) Monitoring wells shall be designed, installed, and decommissioned in accordance with the practices described in:

   1. (1) “Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process”, ASTM E1527-13, 2013, available as noted in Appendix B;
   2. (2) “Standards Related to Environmental Sampling”, Fifth Edition, ASTM SAMP14, 2014, available as noted in Appendix B; or
   3. (3) “Standard Guide for Decommissioning of Groundwater Wells, Vadose Zone Monitoring Devices, Boreholes, and Other Devices for Environmental Activities,” ASTM D5299-99(2012)e1, 2012, available as noted in Appendix B.
2. (b) The permittee shall install at least one hydraulically up-gradient groundwater monitoring well to monitor ambient groundwater quality.
3. (c) The permittee shall install at least 2 hydraulically down-gradient monitoring wells to monitor groundwater quality related to the activity for which the permit was issued.
4. (d) Monitoring wells shall be constructed and decommissioned only by licensed New Hampshire water well contractors holding a valid technical drillers license under RSA 482-B.

Source. (See Revision Note at part heading for Env-Wq 402) #8955, eff 7-26-07; ss by #11036, eff 3-1-16 (from Env-Wq 402.09)