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<br /> <br />'" <br /> <br />. <br /> <br />. <br /> <br />- - -- -. <br />---~- <br /> <br />'" <br /> <br />J. <br /> <br />'j:.- <br /> <br />,.. <br /> <br />.' <br /> <br />'" <br /> <br />.., <br /> <br />Individual sewage disposal systems, If Improperly located, designed, or <br />maintained, can cause contamination of ground and surface waters. In both of <br />the cases Illustrated, Insufficiently treated household effluent Is <br />contaminating waters used locally. On the left, the effluent reaches a stream <br />due to thin, permeable gravels lying over Impermeable shale. On the right, a <br />homeowner unknow I ng I y 15 po I I ut I ng his own we I I water due to the f low of <br />contaminated water from the septic system through the rock fractures. <br /> <br /> <br />UN.CONJ:r~t::.b Aq,Ul~E1L. <br /> <br />Th J 5 d I agrammat j c sketch shows common ground water cond i t i ens <br />found in Colorado. Well UAll, located near a stream <br />penetrates the water saturated sands and gravel. The ground <br />water is recharged prlmari Iy by the stream and Irrigation if <br />the area 15 agricultural. Water yields from this unconfined <br />aquifer can be as great as 2,000 gal Ions per minute and the <br />ground water table may be only a couple of feet below the <br />ground surface. Wel I 11811 Is located in older sand and gravel <br />on a stream terrace above the present stream. The ground <br />water levels and recharge are primarily the result of <br />precipitation, runoff, and lawn irrigation In the <br />subdivision. Notice the mounding of the ground water table <br />under the houses. Yields from this well will be less than <br /> <br />22 <br /> <br />TE'P-RAC.E <br /> <br /> <br />c <br /> <br />-tl.f~H.E1> WATER TABL:.e... <br />G'R.OUw.p WATER. ThlloL,J::. <br /> <br />:::;;:.:. :...:.".->-.-. <br /> <br />----- <br /> <br />IMPERIv\UZ,)...E BCD'lWC.K.._ _ ~ <br /> <br />" ',- <br /> <br />.', <br /> <br />, , <br />C(H'U~INEi> AltUIF}:~" <br /> <br />':-..:. <br /> <br />from "A" because of a sma II er saturated th i ckness and lower <br />permeabi I Ity of the aquifer. <br /> <br />Well "C" Is located on an upland surface characterized by <br />several feet of weathered bedrock at the surface. The well <br />penetrated th i 5 5 i I ght I Y more permeab I e I aver before pass i n9 <br />through the impermeable shale bedrock into a confined <br />sandstone aquifer. The ground water in the sandstone may be <br />recharged many mi les away and thus is susceptible to <br />overuti i Izatlon without the ability to fully recover. The <br />water may be artes i an, wh i ch means it wi 1 1 rise in the we I I <br />above the top of the aquifer. Yields from this type of <br />aquifer are highly variable. <br />