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GREG LEWICKI TEL:1-303-629-9335 <br />Apr 02,93 18:17 hJo.001 P.04 <br /> <br />Levels of pH at this site range from 6.1 to 7.2. <br />This well normally recorded EC's in the range of 220 to 7(tb, however, there were <br />times when, according io P&M's environmental engineer, mined overburden has <br />leached some salts into the alluvium and resulted in some Higher numbers, such as the <br />EC of 2610 recorded on 10/18/95. Much of the increased salt was due to increases in <br />sulfate, magnesium and calcium, <br />There have been no known effects on the alluvial aquifer by the mining or the <br />~ reclamation of the Apex site. During reclamation, all tanks were removed in a safe <br />way. Any oils, greases or other chemicals were removed with no spillage. No visible <br />contamination of the soil or subsoil was noticed at any time during the reclamation. <br />Due to potential quality problems with the P&M ""I'R-1.5" location from downstream <br />sources and since the TR-1.5 site is a significant distance downstream, Sunland agreed, <br />at the wishes of the DMG, to abandon the use of the 7'lz-1.5 date and to sample <br />groundwater at a pains intmedietc]y downstream of the mine disturbed area, as shown <br />on the revised Map Exhibit P-3. This change took effect in the fall of 1997. "fhe new <br />location is on the Baumgartel property adjacent to the mincsite. A hydraulic auger was <br />used to drive a 3" diamter hole 2 feet lower than the alluvial water surface. The hole <br />was augered to a depth of 7 feet. A 1.5" inner diameter I'VC pipe with a slotted <br />section on the bottom was installed in the hole after first adding bentonite to the <br />bottom on the outside of the pipe. Sand was then filled around the outside of the <br />slotted section followed by bentonite and then soli to the top. A cap was placed on the <br />open pipe. Sampling will take place inside the slotted 1'VC pipe. The slots ere 1120 <br />size, providing 2.15 square inches of open area per linear foot. The slotted section is <br />4' in length. Mr. Bob Baumgartel has given permission ibr the installation on his <br />property and for tri-annual monitoring of the silt. <br />~ The sampling program for the well on the Baumgartel property is described under <br />"Surface Water Monitoring and Sampling" on page 65.06. The sample from that well <br />which is collected each year by August 3] will be analyzed for the following <br />parameters, in addition to the field paramaters listed for the alluvial wells: <br />total suspended solids calcium nitrate-nitrite <br />total dissolved solids total iron silver <br />total alkalinity manganese sodium <br />aresnic magnesium sulfate <br />bicarbonate mercury zinc <br /> <br />Revised 8/2d/97 /f'/1~- O~ <br />~, `2./ <br />