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• (Page 2) • MINE iD # OR PROSPECTING ID # INSPECTION DATE 09/25/98 The following observations were The final Proctor tests on the u were made during this site visit M-94-117 INSPECTOR'S INITIALS CLK OBSERVATIONS made during this inspection of this 8.4 acre 110(2) site. stream raise to the dam, and the final compacted dam layers, Observations of the procedures were recorded at this time. Density and moisture tests were done by Jim Riley of HP Geotech, using a nuclear densipmeter (stan.dard Troxler 3430) and sand-cone testing tools (6" frame, pre-measured sand, cone, and digging tools). Five sample areas, approximately 100 feet apart and staggered across the dam, were tested with the nuclear densiometer, and three of those areas were tested with the sand cone equipment. These locations were noted by the tester by their distance from a power pole east of the dam, and were reasonably close to previously tested sample locations. The nuclear densiometer tests were taken at 6" and 12" in depth. A hole was made with a standardized frame, measuring stake, and hammer, then the nuclear densiometer was placed into the Y~ole and readings taken. Care was taken for all observers to remain 3' away from the machine while it was taking readings, so as not to confuse the moisture gauge. Measurements were taken for 1 minute, with the following results noted by the DMG inspector: 1) 6" 134.6 PCF, 7. 7$ mc; 12" 137 PCF(pounds per cubic foot), 7.3$ moisture content 2) 6" 128 .7 PCF, 3. 9$ mc; 12" 126. 7 PCF, 4.2$ me 3) 6" 131 .8 PCF, 5. 1$ mc; 12" 134. 5 PCF, 4.9$ me 4) 6" 126 .4 PCF, 4. 4$ mc; 12" 133. 1 PCF, 4.1$ me 5) 6" 124 .4 PCF, 4. 8$ mc; 12" 130. 1 PCF, 4.7$ me These numbers will be compared to pre-set curves derived from laboratory tests of the various soil types present in the dam, and to the soil dug up from the holes in question after the nuclear densiometer tests were taken. Comparisons will be made to ascertain that the level of cc•mpaction for these densities and these moisture contents is above 90$ for each soil type. From the first look, using the most conservative curve derived for these values, it appears that all of the measurements indicate compactions well above 90$. Three sand cone tests were done at locations 1, 3, and 5, using holes 4.5" to 8" deep (depending on how deep it was possible to dig the hole without collapsing the cylindrical surface). The soil was dug out and stored in sealed bags for moisture content testing at the lab, and the hole which had been dug out was filled with fine, pre-measured sand. Care was taken to keep the digging frame flush with the ground, and all equipment operation was halted while the sand was filling the holes, so as to prevent excess settling of the material in the hole. It appears that all tests were conducted with the care necessary to obtain accurate results. Copies of the results are to be sent to DMG as soon as possible. I & E Contact Address NAME Maxine Stewart OPERATOR ITEC Environmental STREE'T' 707 17`" Street. Suite 310 CITY/.STATE/ZIP Denver, Co 80202 cc: Carl B. Mount, DMG ^ CE ^ BL ^ FS ^ HW ^ HMWhID (CH) ^ SE ^ WQCD (CH) ^ Other Ted Gengler, ITEC (see above)