Standards for the construction, reconstruction, abandonment or destruction of wells shall be the standards recommended in the bulletins of the California Department of Water Resources as follows: Bulletin No. 74-81 Chapter II Water Wells, and Bulletin No. 74-90 (Supplement to Bulletin 7481) as these bulletins may be amended by the state from time to time. The content of those bulletins is hereby incorporated by reference with the following additions or modifications:
Bulletin No. 74-90 Monitoring Well:
(A) Exploration holes for determining immediate geological or hydrological information relating to onsite sewage disposal systems, liquefaction studies, hazardous materials investigations, or geotechnical investigations for construction purposes, such as foundation studies, are exempt from the monitoring well destruction standards of Part 111, Bulletin 74-90, provided that a zone of low permeability overlying sediments with water bearing capabilities has not been penetrated. For the above-listed cases, the excavation or boring shall be backfilled with native soils immediately after the investigatory work has been completed. Where a zone of low permeability has been penetrated, the hole shall be abandoned as specified in Bulletin 74-90, Part 111. When the excavation or boring is to be left open and unattended (such as at the end of a work shift), the person in charge of the construction shall take all necessary precautions to ensure the excavation has not created a public health or safety hazard.
('61 Code, § 24.121) (Ord. 1041, passed - - ; Am. Ord. 1103, passed 11-20-91)