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<br />1.0 INTRODUCTION <br />This Analytical Results Report (ARR) is prepared in partial fulfillment of Aftematrve <br />Remedial Contracting Strategy (ARCS) Contract No. lib-W9-0025, Work Assignment No. <br />28-8JZZ issued to the Morrison Knudsen Corporation (MK) by the Region VIII office of the <br />U.S. Environmental Protection Agency (EPA). This ARR has been prepared to report the <br />analytical results from samples collected on April 26, 1995 as part of a Ske Inspection (SI) <br />of the Battle Mountain Gold Site located northeast of San Luis, Colorado (CERCLIS ID# <br />COD983774498). The Sampling Activities Report is included as Appendix A. <br />Based on information derived from the Preliminary Assessment and additional background <br />research, it was determined that surface water pathway targets may be at risk from <br />exposure to potential hazardous substance release originating at the Battle Mountain Gold <br />ske. The surface water pathway was presented as the focus for sampling activities in the <br />Sampling and Analysis Plan (SAP) prepared by MK. Although the ground water pathway <br />was determined to be potentially affected by site acctivvities, an adequate ground water <br />monitoring program incorporating focal drinking water quality monitoring is in place. No <br />site related contaminants are known to have been detected in independently analyzed <br />ground water samples collected from vicinity drinking water supplies (MK, 1995). <br />2.0 SITE DESCRIPTION <br />The Battle Mountain Gold site is located in Costilla County approximately 5 miles <br />northeast of San Luis, Colorado (see Fgure 1). Geographic coordinates of the site are <br />37°15'1.0" North latitude and 105°19'59.5' West longitude. <br />The current Battle Mountain Gold San Luis Project permit area covers 2,200 acres (641 <br />of which are planned for disturbance) in the Sangre de Cristo foothills northeast of San <br />Luis, Colorado. The sRe is the location of historical and current precious metal mining <br />operations. The current operation employs a carbon in leach process using cyanide to <br />extract gold and silver from crushed ore. The site's milling process involves an ore <br />crushing and grinding circuit, a cyanidation circuit, a gold recovery circuit and a tailings <br />treatment circuit (BMG, 1989). Site features include a processing mill, two ore piles, two <br />mine pits and ponds for tailings storage and leachate collection. The two current mine <br />pits are located in the northeastern portion of the permit area and cover a combined area <br />of 130 acres (Attachment i),(BMG, 1988). <br />a~eo~zaao~~aawomAc <br />1- <br />~" 4 o~/roive~ <br />4 <br />