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~F. <br />~E~E>1 ~E~ <br />Greg Lewicki And Associ ?^~? <br />OlYiei..- . _ <br />9054 S. Forrest Drive Phone/Fax: (303) 346-5196 <br />Highlands Ranch, CO USA 80126 E-Mail: lewicki7@attbi.com <br />April 30, 2002 <br />Wally Erickson <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, 2nd Floor <br />Denver, CO 80203 <br />Dear Wally: <br />Received <br />'~T~io.Vras ~i~ <br />MpY ~ 3 2pp2 ~ PefM,t IJo. M-1476 -azo <br />~.61-M-o I 1 J <br />pu ot~~ ~ ~Geolo9Y,/~v~~C°r~r 1'~a1Fi~a.(S~r: <br />D'Nlapo <br />Enclosed are the responses to your adequacy letter regrading the Thomas Pit of Four <br />Comers Materials dated April 18, 2002. <br />Item 1: Monte Potter has sent in a new certification page with the correct wording. <br />Item 2: Enclosed is the manufacturers specification sheet for the Excelsior S-2 erosion <br />control mat. Four Corners commits to installing the mat per manufacturers <br />recommendations. <br />Item 3: Four Corners will comply with any and all requirements of the CDPHE <br />regarding the abandoned sewage treatment ponds. <br />Item 4: The deposit will be mined to a depth of 40 feet although the full depth of the <br />gravel at this location is not known. Past pre-law mining of gold in the dredge hole <br />(north of the lake) was said to have been 60 feet in depth of gravel. I estimate that the <br />depth of the gravel in the lake area is 50 to 60 feet. The gravels are underlain by the <br />Hermosa Formation of the Pennsylvanian Period, which consists of approximately 2000 <br />feet thickness of marine fossil-beazing sandstones, shales, conglomerates and limestone. <br />Additional Item: Page 39 has been re-worded to eliminate the use of the ditch for site <br />water demands. <br />Additional Item: The well permit for the lake has been applied for by the landowner. <br />Additional Item: The comment made in Dennis Pierce's letter regarding the location of <br />