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GENERAL INTRODUCTION Improperly coaslructt, .al(". maintained, or destroyed wells are u potential path--ay for inTmducing Immr quality water, pollutants, and contaminanis to grmd-quality ground water. The potential for ground water quality degradation increases as the; number of wells and borings in an area inLyeascs, Improperly constructed,altered, maintained,or destroyed wells can faciMalc ground water quality degradation by allowing: • Pollutants. oantan:inanm and wager to enter a well bore or casing: Poor quality surface and subsurface: water, pollutants, and arntamjnants to move between the ca5irjg 317d borehole wall; • poor equality ground water, pollutants, and c;omaminants to move from one stratum or aquifer 10 another, and, ■ The well Wre; to be tiled for illegal waste disposal. PerMne,ntly inactive, or "abandaned" wells [fiat have not been properly destroyed pose a seriows threat to water quality. They..are frequently forgot Iun and become dilapidated with time,and thus can become;conduits for ground water quality dcgir.3datioa. In addition, humans and animals c-in fall into wells left open at the su rFact. History of D R Standards The Depariment of Water R crur= has responsibility for cic;vaioping standards for wells for tlic proictEion of water quality undefr California Water Code Section 231, Water Code Section 231 wis enactcZ in 1949G twvwlde standards for water wells were first formally puhlishcd in 1968 as D R Bulletin 74, Wurer Well .Siandards,' Stare of CafijbWa. Standards for lhotlic proteetiort wells &:Rowed in 1.973 ns Bulletin 74-1, Carhadic Protection Weft Standards: .Stare of C'alrfewim. Bulletins 74 and 74-1 are now out of print. A revised edition of Bulletin 74 was publi�shW in 1981 as Bulictin 74-81 Water Well Aan r&. .Stare of C'ufrfornia. -Bulletin 74-81 i;i enclmd in the hack ever of this report, `Inc law for establishing and implementing wdI standards was changed signiftc andy in 1936 by Assembly Pill 3127 and Senate$ill IS17 (tiuw Chaptea 1152 and 1373. S tat ato of 1<986)i Assembly Bill 3127 (Water Codc ,ction 13901) mgttires that (1) $y September I, M9, the State Water Rostources Conirul Snard adopt a model wail ordinance implemendrig D" standards. (2) By January 15, 19M. all coundf:S and cities, and water agency, where apppL)priate, adapt a well ordinance that rnLels or excvxAs DWR well. standards. (3) By Februgry 15, 19". the Board's model ordinanLc its to be:enforced by any county,city,or-water agency failing To adopt a weal ordinance. e,nate;Bill 1817 asnimcicd the Water Code to specifically fadude:monitoring wells. It was previously assumed that monituring we% were inducted in the oollactive term 'well' used in the law. _3