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E-21 Engineering Inc. Phone 303-991-6000 <br />Enaineerina for the Mst Centuru Fax 303-991-6001 <br />2695 South Raritan Street Phone 888-628-1083 <br />Englewood, Colorado 80110 Fax 888-628-1084 <br />January 28, 2008 <br />Ms. Erica Crosby <br />Senior Environmental Protection Specialist <br />Colorado Division of Mines and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Subject: Response to Your Request of 1-15-08 for Additional Items <br />Technical Revision 3 Application <br />DMG Permit No. M-1982-015, St. Vrain Lakes aka Bayshore Ponds <br />Carma Bayshore, LLC <br />Dear Ms. Crosby, <br />In response to your Adequacy Letter of January 15, 2008, we are submitting the following <br />information and supplement our application letter of December 10, 2007, for Technical Revision 3 to <br />the amend Reclamation Permit Number M-1982-015. <br />1. The impacts to St. Vrain River have minimized through the following actions and the river water . <br />has been sampled as follows: <br />a. The contaminated slurry and most of the contaminated soil was removed and disposed of <br />off-site. <br />b. The impermeable barrier wall was installed through the area of the groundwater impacts and <br />effectively cut off most of the groundwater contamination plume from the river. <br />c. The remediation system was installed on both sides of the barrier wall and into the impacted <br />groundwater remaining between the barrier and the river. The remediation system has been <br />operating since late October 2007. <br />d. The plume of impacted groundwater is being monitored by groundwater monitoring wells <br />and additional wells are being placed to further define the plume. <br />e. We have established surface water gauging and monitoring points along the St. Vrain River <br />downstream of the subject release at 2 points. We have sampled and analyzed the water for <br />the constituents of concern on 9 occasions to-date during the period of 12-18-06 to 11-17-07 <br />with no detection of benzene, toluene, ethylbenzene, xylenes (BTEX) methyl tertial butyl <br />ether (MTBE), or other hydrocarbons. A summary table of results through 8-11-07 is <br />attached. The table with the 11-17-07 results is in preparation. <br />f. The Integrated Corrective Action Plan (ICAP) and addendum prepared in accordance with <br />Colorado Department of Public Health and Environment (CDPHE) regulations to mitigate <br />and remediate this impact to groundwater and potential migratory impacts to surface waters <br />1 of 2