Well Standards and Rules
DWR Bulletin 74-7, Water Well Standards, ARROYO GRANDE BASIN, SAN LUIS OBISPO COUNTY
WELL ABANDONMENT AND COTRUCTION STANDARDS
Zone I.
To protect the quality of the affected water, a well not in use for one year shall be destroyed or maintained as defined under Section 21, DWR Bulletin No. 74. Those wells that no longer serve a useful purpose or have fallen into such a state of disuse and disrepair that they may became a means for degradation to ground water quality should be destroyed in a manner that will prevent impairment. In portions of the study area, supplemental. standards , in addition to those in DWR Bulletin No. 74, are needed t o protect the quality of ground water when a well is destroyed. Such standards are for sealing off water of impaired quality. Wells in Zone I should be destroyed according to the standards in DWR Bulletin No. 74
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Zone II.
In Zone II, all wells to be destroyed shall be filled and sealed with impervious sealing material from the ground surface to the elevations shown on Figure 2. The remainder of the well may be filled with inert filler material.
Zone III.
I n addition to the requirements in Zone II, wells to be destroyed shall be filled and sealed with a 20·foot-thick impervious; sealing material extending upward from. 20 feet below those elevations shown on Figure 3. The remainder of the well shall be filled with inert filler material.
1/Before any water well is destroyed, the San Luis Obispo County Flood Control and Water Conservation District or the State Department of Water Resources should be consulted. Use of such wells for monitoring of ground. water conditions will be reviewed.