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Mr. Carl Mount. <br />IVovembec 2I, 2006. <br />P6ge 2 o,J 2 <br />trigger points will now-lie based on the known elevafion of the perimeter drain at each <br />monitoring well in order to evaluate the effectiveness of the,perimeter drain. <br />The locafions of the three monitoring wells aze shown on the attached, drawings„ To <br />.. <br />evaluate the effectiveness of the perimeter drain, and"to protect against adverse effects on <br />existing 'structures; the new trigger elevation for each monitoring well.will be' oRe foot <br />above the elevation of the top. of the drain at each well for three consecutive months. <br />Three 'consecutive months; is necessary to account for `seasonal fluctuations . in <br />gtoundwater flow in the azea, the relatively slow movement of groundwater to the <br />perimeter drain,. and to a11oW the perimeter. dtain sufficient time to effectively drain'the <br />groundwater: <br />Measwed groundwater elevations in excess of one foot above the perimeter drain for .. <br />ahree consecutive months will indicate that the perimeter drain is not functioning <br />properly,. or that groundwater mounding is in excessof the drain's capacity. Carma will <br />provide.the DMG with monthly monitoring well data bn a quarterly basis, except in the . <br />0vent that the monitoring wells ~hoW..three consecutive-months of exceedence of the one- <br />- "foot trigger in which case Carona will notify DMG witlvn 48 hows.. If the three-month; <br />`one-foot' trigger is reached, Garma will work. with DMG to evaluate the' cause of the <br />,excess mounding, and identify potential. solutions or additional mitigation measures at. <br />~ that time.. Carma will identify the additional mitigation measures or potential solutions <br />within 5 working days after notifying DMG of the exceedence. " . <br />Catma will comtni# to monitoring groundwater levels for a. period of.12 months, after Which <br />Canna will evaluate the need for additional monitoring. If offer 12 or more months of monitoring <br />Carina beliedes'tkere, is'sufficient data to demonstrate that the groundwater monitoring is no <br />longer needed at the site "Carina will submit a request to DMG to discontinue the groundwater <br />.monitoring. <br />If you have any questions.please do not hesitate to call me at (303) 452-6611. <br />Cordially, <br />Applegate Gtoup,J/nfc. ~ <br />Donald E.:Frick; E.I. . <br />Water Resource Engineer <br />I <br />N:\05151 Carina\Water Rights\Gen\Ltr - CMount Technieal Revision 11.21.2006.doc <br />I <br />i .. <br />