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:HAPTER II. STANDARDS The standards presented in this chapter are intended to apply to the construction (including major reconstruction) or destruction of water wells throughout the State of California. However, under certain circumstances, adequate protection of ground water quality may require more stringent standards than those presented here; under other circumstances, it may be necessary to substitute other measures which will provide protection equal to that provided by these standards. Such situations arise from practicalities in applying any standards or, in this case, from- anomalies in ground water geology or hydrology. Since it is impractical to prepare standards for every conceivable situation, provision, has been made for deviation from the standards as well as for additional ones. However, the Department believes that for most conditions encountered in the State,the standards presented in this report are satis- factory for the protection of ground water quality. In the past, the Department expended considerable effort in'defining areas where standards should be applied to prevent the mixing of waters of differing qualities in specific ground water areas in California. For example, ground waters of,varying quality in the San Joaquin Valley are naturally separated by a confining bed commonly called the "Corcoran Clay". The standards presented in this chapter continue to support the findings and recommendations made -ding the appplication'of standards to the specific areas .ously studied. (See Table 1, Chapter I.) Par- General �3C�'J.Gi+ = I�i'5:13."1Ti34:70 A. We].' or Wa 1, 13710 L1:= _,-I, r c e. wall :Pr _. .... "...means any artificial excavation constructed by any method for the purpose bf extracting water from, or injecting water into, the under- Faound. - This defnition, shall not include: ) oil and gas wells, or geothermal wells constructed under the jurisdiction of the Department of Conservation, except those wells converted to use as water wells; or (b) wells used for the purpose of (1) dewatering exca- vations during construction, or (2) stabilizing hillsides or earth embankments." B. Community Water Supply Well. A water well used .y water for domestic purposes in systems subject to 1hapter 7, Part 1, Division 5 of the California Health and safety :ode. Included are wells supplying public water systems classified by the Department of Health Services as mica: te: are Lef: Led in Appendix A