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"...floodplain of a 100 year flood..." or above "...any recorded high tide, .", (Section 64417, "Siting Require- ments", Title 22 of the California Administrative Code). In addition, the area around the well shall slope away from the well and surface drainage shall be directed N I away from the well. z , ZD. Where a well is to be near a building, the well o �, shall be far enough from the building so that the well will d 3 3 W o zo w o be accessible for repair, maintenance, etc. Iw �3 m < Section 9. Sealing the Upper Annular Space. Za I o z CD Thespace between the well casing and the wall of o(n o�-a the drilled hole (the annular space) shall be effectively Uj 3�? W sealed to protect it against contamination or pollution by w w I oz(n _ H entrance of surface and/or shallow, subsurface waters. �Z I 3 3 o A. Minimum depth of seal below ground surface for various uses of wells: I � Z Minimum Depth of Seal LU Types (below ground surface) w 0 _j Community Water Supply Wells 50 feet (15 metres) C7 Individual Domestic Wells 20 feet4J (6.1 metres) U. Industrial Wells 50 feet4/ (15 metres) 0 Agricultural Wells 20 feetZV (6.1 metres) Air-Conditioning Wells 20 feetT (6.1 metres ,�,� -j Observation and Monitoring Wells 20 feetE/ (6.1 metres) U.j3 ti N 3 X W If compliance with this requirement for community water > supply wells is not possible, the enforcing agency should ;7 w be contacted regarding alternative means for protection. � I 3 W Annular seals are also installed to provide protection for the casing against corrosion, to assure structural integ- N a z 0 rity of the casing, and to stabilize the upper formation. In those cases where it is not possible to meet or, when V necessary, increase, the lateral distances from pollution I u_,°C,., W sources described in Section 8 of these standards, an n. U. alternative (or special) means of protection for the well 2.0 LL is to increase the depth of,the seal. b _ W Exceptions are shallow wells where the water to be devel- oped is at a depth less than 20 feet (6 metres). In this 4/ LU �"� instance, the depth of seal may be reduced but in no case Z -► — _ "'i — — ;/ less than 10 feet (3 metres) and special precautions taken CL in locating the well with respect to sources of pollution. The annular space shall be sealed to a depth of 50 feet _ _ (15 metres) from the surface when the well is close to Co LL sources of pollution listed in Section 8. Because they are constructed to measure specific condi- tions, the annular space in such wells is usually sealed to make the intake section "depth-discrete". Depending on the circumstances, this depth may be very shallow.