7 Del. Admin. Code § 7103-33.0

Current through Register Vol. 28, No. 4, October 1, 2024

Section 7103-33.0 - Groundwater and Surface Water Monitoring

33.1 Groundwater should be monitored on a periodic basis to evaluate increased levels of potentially mobile pollutants such as NO3--N. The number and location of wells required will depend on site characteristics, present groundwater quality and potential for groundwater degradation beyond allowable limits. Wells should be cased to prevent contamination from surface water. Groundwater monitoring is generally conducted in three primary areas:

3.1.1 up-gradient of the land treatment site to provide background information,

3.1.2 directly beneath the site, and

3.1.3 down-gradient of the site.

33.2 Parameters should be classified in priority levels and monitored at different frequencies depending upon priority level. Operational changes in the treatment process and/or waste stream character may dictate moving parameters from one priority level to another.

33.3 Surrounding surface waters should be monitored essentially for the same parameters as measured in groundwater, plus constituents that may move in surface runoff and erosion such as P and NH4 + N. Sampling locations will depend upon the hydrologic characteristics of the site. Channels or ditches and subsurface drains which drain the site should be sampled as a high priority.

7 Del. Admin. Code § 7103-33.0