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STATE OF <br />COLORADO <br />011 4 <br />GA S <br />N COMMISSION <br />DEPARTMENT OF NATURAL RESOUR ES <br />9/// Owens, Gov rnor <br />1120 Lincoln St„ Suit 80.1 <br />Deriver, CO 8 203 ;. <br />Phone: (303) 894 100 <br />FAX: (303) 894- 109 <br />October 25, 2000 <br />RECEIVED <br />Mr. Stanley Barron 0 CT 3 0 2000 <br />President <br />Spanish Peaks-Purgatoire River SCD DMslon of Minerals & Geology <br />422 East First Street <br />Trinidad, CO 81082 <br />Re_ M-ethaae•gas-seep- on-the-Toupal Property, Center of Sec, 28-T339-R-67W, Las <br />Animas County, Colorado <br />Dear Mr. Barron, <br />The Colorado Oil and Gas ConservatigX, Commission (COGCC) has investigated a <br />methane gas seep reported north and South of Highway 12 at the east end of the Basin <br />Resources Inc. Mine, centered in Section 28, Township 33 South, Range 67 Vilest, Las <br />Animas Cotjnty. Two shut-in gas wells d4wngradient were implicated as the possible <br />source of the seep. Fibld investigation revealed methane-in the bradeoliead of the eastein <br />well, the Pickotwire 28-10; the bracfenhead also had 20-potmds of pressure. No pressure <br />was found in the casing or bradenhead in the western well, the Picketwire 28-11. <br />Investigation of the sQ adjacent tta the wells, using aFlame Ionization Device (FID), <br />revealed no methane- The FID is capable of mrasuring .0001 percent hydrocarbons, <br />Four monitor wells installed by Basin Mine consultants (Greystone) near the Picketwire <br />28-11 had varying levels of methane when tested with the FID. These monitor wells are <br />37 feet to 105 feet away from the Pickotwire 28-11. Two monitor wells near the <br />Picketwire 28-10 were tested with the FID; there was no gas in these monitor wells. <br />Sttdgsed of dead vegetation is present at the-seep. -The areas of'dead vegetation, the gas <br />wells and the monitor wells were mapped using a Global Position System (GPS) - <br />instrument capable of 1 to 3 meter acatiracy with differen ial correction. The gas wells <br />were drilled in October, 1990, An infrared aerial photo dated August 26, 1990 was <br />ordered from the EROS Data, Center (see attached photo). Aa overlay of the GPS map <br />was made and attached to the infrared photo, it shows the stressed and dead vegetation <br />existed in almost the same spots before the gas wells were drilled. <br />The gas wells were never commercially produced. The Picketwire wells were plugged <br />October 9`t' and 10`h by GeoMet. You witnessed the plugging of the wells. The ground <br />around the gas wells was excavated to approximately 10 to 15 feet below ground surface <br />(bgs)_ The HD was used to check the soil around the well casing in the excavation, no <br />DEPARTMENT of NATURAL RFSgURCEs: Grog E. Wgkher, Ex-wl" Oiredor <br />COGCC coMM1331ON: Tan Ann casky . Bfleq cree - 3rmib Jphnim . MICheel Keen -Abe PMI9p% • Daniel Slrrabacz - Stephen Sonnenberg <br />COGCC STAFF: Richard S enabling, Director - Prhn I Macke, DePW Dire-tor . Morris Bon, Operellans Meouger <br />Parnda C. Beaver. Hearings Managar - Thomas J- Kerr. Informarlon Manager <br />l.? <br />i?. <br />I? <br />j. <br />i.