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i 1 <br /> COLORADO LEGACY LAND 01960.11V ® <br /> 4601 DTC Boulevard,Suite 120,Denver,CO 80237 OCT 24 209 <br /> T.(303)862-3928 <br /> October 18,2019 "ON OF RECLAMATION <br /> Ms.Amy Eschberger MININGAND SAFETY <br /> Division of Reclamation,Mining,and Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street,Room 215 V-S/r `rill m a pS <br /> Denver,CO 80203 <br /> Subject: Technical Revision#29:Monitoring Well Removal <br /> Mine Land Reclamation Permit M-1977-300,Former Schwartzwalder Mine,Golden,Colorado <br /> Dear Ms. Eschberger: <br /> Colorado Legacy Land, LLC (CLL) is currently executing a soil excavation project in support of the ongoing <br /> environmental remediation and reclamation work at the Former Schwartzwalder Mine site in Golden, n 3 <br /> Colorado. <br /> Five monitoring wells in the current quarterly monitoring network(four shallow alluvial monitoring wells,and o <br /> one deep bedrock monitoring well) are within the boundaries of the excavation areas (Figure 1). Four of �4 <br /> these monitoring wells were installed in the alluvial material are recommended for removal and disposal ��, W <br /> in the Minnesota Adit onsite. Table 1 summarizes the well location, construction information, N C <br /> lithology, and justification for removal. Detailed soil boring logs and monitoring well construction reports <br /> are included in Attachment A. <br /> Monitoring wells MW-1, MW-2, MW-3A, and MW-9 are recommended for removal to ensure that the <br /> surrounding contaminated alluvial soils are appropriately excavated and disposed of in the Minnesota Adit. <br /> Excavation around these wells in anticipated to extend to bedrock,therefor these alluvial wells will not yield <br /> representative data once the surrounding alluvium have been removed. The current groundwater monitoring <br /> network (Figure 2) provides sufficient delineation of upgradient, downgradient, and cross-gradient <br /> monitoring locations. Well removal shall be documented with a Well Abandonment Report, Form GWS-09 w <br /> (Attachment B)and filed with the State of Colorado,Office of the State Engineer within 60 days of removal. n <br /> Monitoring well 18(MW-18)is a deep bedrock well,originally installed to 235 feet deep near the Illinois Fault 3 o I�Na <br /> zone.This well provides pertinent groundwater monitoring data and will be protected during excavation work. °; N <br /> If needed the PVC well casing can be shortened to the match new ground surface,and licensed land surveyors <br /> will mark the new top of casing location(easting,nothing,elevation). <br /> If you have any questions regarding this technical revision,please don't hesitate to contact me. <br /> Sincerely, <br /> y <br /> A. <br /> Jim Harrington,Managing Director <br /> COLORADO LEGACY LAND <br /> Jim@ColoradoLegacy.Land <br /> cc: Paul Newman-CLL,Managing Director,paul@coloradolegacy.land <br /> Eric Williams-CLL,Managing Director,eric@coloradolegacv.land <br /> Billy Ray-Alexco Water&Environment Inc,Project Manager,bray@alexcoenv.com <br /> PAGE 1 OF 10 <br />