California Water Well Standards, DWR Bulletin 74 ... - County of Glenn

c.STANDARDSPart I.GeneralSection 1. Definitionsl.AB.Monitoring Well. The term "monitoring well" is defined in Section 13712 of the CaliforniaWater Code as:"...any anificial excavation by any method for the purpose of monitoringfluctuations in groundwater levels, quality of underground waters, or theconcentration of contaminants in underground waters."roloration Hole (or Boring). An uncased temporary excavation whose purpose is the immediatedetermination of hydrologic conditions at a site.Enforcing Ageng. An agency designated by duly authorized local, regional, or State governmentto administer and enforce laws or ordinances penaining 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.Under certain circumstances the enforcing agency may waive compliance with these standards and prescribealternate requirements. These standards may be waived where they are impractical or ineffective because ofunusual conditions or would result in an unsatisfactory condition or well function. In waiving any of thesestandards the enforcing agency shall, if at all possible, require measures be implemented to provide the sameor greater level of water-quality protection that would otherwise be provided by these standards.Section 4. Exclusions.Most standards in Part II, "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 indepth 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 backhoetrenches, 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 andthe backfill compacted in lifts to attain at least 90 percent relative compaction in order to restore physicalconditions in the excavation as much as possible. If a layer or layers of material that serve to impede the