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Section 5. Special Standards. Most of the factors involved in determining safe distances in
<br /> a particular area are usually not known. Based on past
<br /> A. In locations where existing geologic or ground experience and general knowledge, the following horizontal
<br /> water conditions require standards more restrictive than distances are considered safe where dry upper unconsolidated
<br /> those described herein, such special additional standards may formations, less permeable than sand, are encountered:1/2/
<br /> be prescribed by the enforcing agency.
<br /> Sew@r, watertight septic tank,- 50 feet
<br /> B. Special standards are necessary for the con or pit privy (l5 metres)
<br /> struction of recharge or injection wells,] horizontal wells
<br /> and other unusual types of wells. Design of these wells is Subsurface sewage leaching 100 feet
<br /> subject to the approval of the enforcing agency. field (30 metres)
<br /> Section Well Drille:_ Cesspool or seepage pit 150 feet
<br /> (45 metres)
<br /> The construction, alteration, or destruction
<br /> wells shall be performed by contractors licensed in Animal or fowl enclosure 100 feet
<br /> accordance with the provisions of the Contractors Lie( Lai (30 metres)
<br /> (Chapter 9, Division 3, of the Business and Professio3 ode',
<br /> unless exempted by that act. Where in the opinion of the enforcing agency
<br /> Section 7. Reports. adverse conditions exist, the above distances shall be
<br /> increased or special means of protection, particularly in the
<br /> Reports concerning the construction, a: :)n, o, construction of the well, shall be provided.
<br /> destruction of water wells shall be filed with t] form., B. In addition, if possible, the well shall be
<br /> Department of Water Resources in accordance with t. located up the ground water gradient (upstream) from the
<br /> sions of Sections 137 0 through 13755 (Division 7, specified sources of contamination. By doing so this
<br /> Chapter 10, Article of the California Water Cod, provides assurance that potential contamination would be
<br /> moving naturally away from the area of production. However,
<br /> xasz rreii ��e�suc�:iou in an unconfined aquifer consideration shall also be given to
<br /> ; ._ the possibility of reversal of gradient near the well due to
<br /> ,ec �on ts. wey i Lor:_r.�. ,, {_�,�: 1: t; ^:,:.ir_�� :-. pimping (see Figure 3), the pumping of nearby-wells, or
<br /> 011utants- general decline of the water table.'y
<br /> A. All wells shall be located an adequate h i C. The top of the casing shall terminate above
<br /> zontal distance from potential sources of contaminatio ani grade or above any known conditions of flooding by drainage
<br /> pollution._3/ or runoff from the surrounding land. For community water
<br /> supply wells this level is defined as above the
<br /> A program to protect underground drinking wate sources
<br /> from endangerment by the subsurface emplacemen oX- iu ds Because of the many variables involved isi the determina-
<br /> through well injection is required under the F deral Safe tion of the safe horizontal distance of a well from
<br /> Drinking Water Act. (Public Law 93-523) signed uto law potential sources of contamination and pollution, no one
<br /> December 16, 1974. On June 24, 1980, the U. Environ set of distances will be adequate and reasonable for all
<br /> mental Protection Agency issued rules and reg iti.o conditions. In areas where adverse conditions exist, the
<br /> establishing technical criteria and standards >ver distances listed should be increased. Conversely, where
<br /> the construction of injection wells. Revisi- especially favorable conditions exist or where special
<br /> August 27, 1981, and October 1, 1981. These ,Tula: means of protection, particularly in construction of the
<br /> are Part 146 of Title 40, Protection of Envir vent well are provided, lesser distances may be acceptable if
<br /> the Code of Federal Regulations (40CFR146). approved by the enforcing agency.
<br /> Information about the report is contained in f If the well is a radial collector well, these distances
<br /> Preparation of the Water Well Drillers Repc: , apply to the furthest extended points of the well.
<br /> of Water Resources, October 1977. _ ��
<br /> / When water is pumped from a well a drawdown cone of Such potential sources of contamination and .p
<br /> include: sewers., both sanitary and storm se-.. depression" is formed in the water surface surrounding the
<br /> fields (from septic tanks), .sewage and ind-ust well and ground water la the area of the cone flows
<br /> ponds, barnyard and 'stable. areas, feedlots, s toward the well. Similar cones formed by nearby area
<br /> being
<br /> disposal sites, tanks and pipelines (both abo gro influence the shape of the cone or edire tion area be
<br /> buried) for storage and conveyance of petrole pro drawn upon resulting in a change indirection of flow.
<br /> or chemicals, etc:.
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