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STANDARDS Part I. General Section 1. Definitions1. A. Monitoring Well. The term "monitoring well" is defined in Section 13712 of the California Water Code as: "...any artificial excavation by any method for the purpose of monitoring fluctuations in groundwater levels, quality of underground waters, or the concentration of contaminants in underground waters." B. Exploration Hole(or BoEj . An uncased temporary excavation whose purpose is the immedi- ate determination of hydrologic conditions at a site. C. Enforcing Agency. An agency designated by duly authorized local, regional, or State govern- ment to administer and enforce laws or ordinances pertaining to the construction, alteration, maintenance, and destruction of monitoring wells. Section 2. Application to Well Type. These standards apply to all types of monitoring wells, except as prescribed in Sections 3, 4, and 5, below. Before a change in use of a well is made, any standards for the new use must be complied with. Section 3. Exemptions for Unusual Conditions. r Under certain circumstances the enforcing agency may waive compliance with these standards and prescribe alternate requirements. These standards may be waived where they are impractical or ineffective because of unusual conditions or would result in an unsatisfactory condition or well function. In waiving any of these standards the enforcing agency shall, if at all possible,require measures be implemented to provide the same or greater level of water-quality protection that would otherwise be provided by these standards. Section 4. Exclusions. Most standards in Part 11, "Monitoring Well Construction," page 41, do not apply to "exploration holes." However,provisions of Section 7,"Reports," below and Part III,"Destruction of Monitoring Wells,"page 50, do apply directly to exploration holes. Exploration holes for determining suitability of on-site domestic sewage disposal that are less than 10 feet in depth are exempt from the reporting and destruction requirements of these standards. Large volume excavations for determining the suitability of on-site domestic sewage disposal,such as backhoe trenches, that exceed ten feet in depth are exempt from the requirements of Part III of these standards. However, such excavations shall be backfilled with the excavated material or other suitable fill material and the backfill compacted in lifts to attain at least 90 percent relative compaction in order to restore physical conditions in the excavation as rtaa)cb as possible. if a layer or lavers of material that serve. to impede the t Sclected technical terms are du fined in Appendix A, gage 77. -39-