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<br />.. <br /> <br />,.... <br />o <br />CD <br />00 <br /> <br />approximately 50 yards west of his water well. Amoco employees and COGCC staff <br />visited the site and confirmed these reports were accurate. <br /> <br />The initial investigation involved evaluating the design and mechanical integrity of <br />existing gas wells and searching for abandoned gas wells in the area to determine if <br />they might be the source of the gas at the subdivision. <br /> <br />Since 1987, eleven Fruitland Coal wells have been drilled within two miles of the Pine <br />River Subdivision. The .cOGCC reviewed records of wellbore construction arid <br />bradenhead tests from these gas wells. The review of these records indicated all the <br />producing gas wells within a two-mile radius had surface casing set at the required <br />depth and cemented to surface. Also, production casing for these wells was cemented <br />to surface as required by the COGCC for Fruitland Coal wells. Bradenhead tests for <br />these wells. were reviewed. From this information the COGCC determined these <br />well bores were constructed as required by regulations and were notthe direct source <br />of the gas sl:leps. In addition, no abandoned wells were found in the area. <br /> <br />Amoco performed additional bradenhead tests on their wells in the area. These tests <br />also indicated the Amoco wells were not leaking in a manner that could have caused <br />the gas seeJ'lage at the subdivision. <br /> <br />It was then noticed that the Pine River Subdivision was directly over the Fruitland .coal <br />subcrop. Amoco obtained and analyzed a gas sample from the resident's water well <br />and gas from a nearby Fruitland Coal gas well. The gas samples were very similar <br />with methane being the major component of each sample. In addition, the carbon-13 <br />isotope values for the methane in both samples were also very similar. Amoco also <br />analyzed a water sample from the resident's well. The results indicated the water, had <br />a relatively high total dissolved solids value of 680 parts per million even though the <br />well was completed in the alluvium and very close to the Pine River (50 - 100 ppm). <br />The results also indicated the sample was very high in bicarbonates. These results' are <br />typical of produced Fruitland Coal water in this area. Both the gas and water analyses <br /> <br />2 <br /> <br />j,' <br /> <br />.,5- 11;;.'.' , <br />