Dames & Moore, 1999 - USDA Forest Service

time frame. The concentration of each of these metals increased from SP-14 Upper, to SP-14, and finally
to SP-14 Lower with the exception of iron. Iron at SP-14 Lower (30 pg/L) was similar to SP-14 Upper
(~20 pg/L). The iron concentration at SP-14 (480 pgL) was above the samples collected at SP-14 Upper
and SP-14 Lower. Field pH readings ranged from 4.5 to 6.1 SU. The lowest pH (4.5 SU) was recorded at
SP-14 Lower. Minor seepage was observed flowing from the 800-level waste rock pile and into the
intermittent drainage during a Site visit in June 1998.
Samples were collected from the lower portion of the Honeymoon Heights drainage at seeps SP-23 and
SP-23B in May 1997, SP-23 UP in July 1997, and SP-23 and SP-23 Vent ~6ad in October 1997.
Additionally, samples were collected weekly at SP-23 from May 23, 1997 to June 16, 1997 to assess
event-related variability. SP-23 was also sampled in May 1998. SP-23 Up is located on the upside of the
1500-level ventilator portal road in line with the SP-23 drainage. Sample SP-23 Vent Rd. is located in the
drainage as it crosses the portal ventilator road. Sample locations are shown on Figure 5.4-1.
Seeps SP-23 and SP-23B were both sampled originally on May 23, 1997. Concentrations of aluminum,
cadmium, copper, manganese, and zinc at SP-23 were generally above SP-23B concentrations but within
an order of magnitude. lron was not detected at either location. Aluminum, cadmium, copper,
manganese, and zinc continually decreased at SP-23 from May 23 through June 16, 1997. This location
was not sampled during the July 1997 field effort as it was not flowing. A sample was collected in
October 1997 after a precipitation event. Concentrations of aluminum, cadmium, copper, and zinc in
October were similar to those detected on June 16, 1997. Manganese increased from 79 pg/L to 128 pg/L.
Iron was not detected at SP-23 during any of the 1997 field sampling events. A sample was collected at
SP-23 in May 1998. Concentrations fo; aluminum, cadmium, copper, maiganese, and zinc were slightly
below' concentrations detected in May 1997. Iron was not detected.
SP-23 Up was sampled in July 1997. Seeps lower in the drainage were not flowing during this sampling
event. Concentrations of aluminum, cadmium, copper, manganese, and zinc at SP-23 Up were above
concentrations detected at SP-23 but within the same of order of magnitude. lron was not detected.
SP-23 Vent Rd. was sampled in October 1997. Concentrations of aluminum, cadmium, copper,
manganese, and zinc were similar to those detected at SP-23 Up in July and to SP-23 in October. lron
was not detected at SP-23 Vent Rd.
Field pH measurements at the SP-23 locations (SP-23, SP-23B, SP-23 Up, and SP-23 Vent Rd.) ranged
from 4.2 to 5 SU.
SP-12 is located adjacent to Railroad Creek, downstream of SP-23 and upstream of the mouth of the
portal drainage. Samples were collected in May and July 1997. Aluminum, cadmium, copper, and zinc
concentrations were similar during both sampling events. Manganese increased from 53 pg/L in May to
93 pg/L in July. Iron was not detected at SP-12. Field pH measurements ranged from 5.03 to 5.48 SU.
SP-12 was not flowing during the fall 1997 field event and was not sampled.
\U)M~SEAI\VOLI\COMMOMWP\WPDATAUX)~\REWRTSWOLDEN-~UUU~.~OC 5-44 : DAMES
17693-005-019Uuly 28.19991 1:09 AM;DRAFT FINAL RI REPORT
& MOORE