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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 U5 away from the well. o Z D. Where a well is to be near a building, the well 3 a: LL! shall be far enough from the building so that the well will o cn cUj be accessible for repair, maintenance, etc. p W w Cr a Section 9. Sealing the Upper Annular Space. lCD x o 4M a The space between the well casing and the wall of 01 N o t Q the drilled hole (the annular space) shall be effectively W 3 W W sealed to protect it against contamination or pollution by w a W� H entrance of surface and/or shallow, subsurface waters. �_ o A. Minimum depth of seal below ground surface for various uses of wells: l o 2 Minimum Depth of Seal yTypes (below ground surface) W 0 Community Water Supply Wells 50 feet (15 metres) C'3 Individual Domestic Wells 20 feet4J 6.1 metres) Industrial Wells 50 feet4,,./ (15 metres) Agricultural Wells 20 feetZ (6.1 metres) Air-Conditioning Wells 20 feet (6.1 metres w w -� Observation and Monitoring Wells 20 feetE/ (6.1 metres) 3 Q [) 3 � W If compliance with this requirement for community water > supply wells is not possible, the enforcing agency should ^? w be contacted regarding alternative means for protection. *- Annular seals are also installed to provide protection for N1LLthe casing against corrosion, to assure structural integ- 0 rity of the casing, and to stabilize the upper formation. _J�- In those cases where it is not possible to meet or, when U_- V necessary, increase, the lateral distances from pollution wIr W sources described in Section 8 of these standards, an a LL, alternative (or special) means of protection for the well 2-0 UL is to increase the depth of,the seal. 0_ W Exceptions are shallow wells where the water to be Bevel- _ CL.�CL oped is at a depth less than 20 feet (6 metres). In this W 1 instance, the depth of seal may be reduced but in no case less than 10 feet (3 metres) and special precautions taken L in locating the well with respect to sources of pollution. J ; J �/ The annular space shall be sealed to a depth of 50 feet —} (15 metres) from the surface when the well is close to v + + 1 iTL sources of pollution listed in Section 8. a 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.