HYDRO31005

• Permit No: C1981012
• IBM Index Class Name: Hydrology
• Doc Date: 1/6/2003
• Doc Name: 3rd Quarter 2002 DMR
• From: Peak Project Management
• To: DMG
• Permit Index Doc Type: DMR’s
• Media Type: D
• Archive: No

RECEO~E~
JAN psi
UtV~sion of Minerals and CealogY
January 2, 2003
Ms. Carla Lenkey,
Colorado Department of Health
Water Quality Control Division
Permits and Enforcement Section
WQCD-PE-B2
4300 Cherry Creek Drive South
Denver, CO 80246-1530
Peak Project Management
3800 County Road 63.9
Trinidad, CO 81082
Telephone/Fax: [phone]
e-mail: ronthompson rr, sensonics.orR
RE: NPDES Permit No. 000000906: Revision of NPDES Discharge Number 007
Monitoring Report for Third Quarter 2002
Dear Ms. Lenkey:
Attached is a revised discharge monitoring report for Discharge Point 007. Based on
three discharges during the 90 day period, the frequency of analysis and average quality
or concentration were miscalculated. First it was incorrectly assrttned (For frequency of
analysis) that an observation of "no-discharge" impacted the frequency of analysis.
Secondly a numerical average of all samples was reported, rather than the highest average
during each 30 day period. The revised DMR correctly reports these parameters.
Intermittent rainfall during the period August 1-6, 2002 resulted in a pond discharge
being observed and sampled on August 5, 2002. (The satnple date was initially reported
as August 6, the date the sample was received by the laboratory). The discharge does not
exceed permit limitations and no application of Alternative Limitations is requested.
Only a trace of rainfall was noted at the Trinidad Lake field office on August 4, 2002;
Rainfall of 0.6" was recorded at the mine site.
Rainfall events at the Mine of 1.2" ou September 9 and 1.6" on September 18, 2002 were
sampled on September 10 and September 19, 2002 respectively. The September 10
sample was submitted for laboratory analysis as required by pertnit. Results indicated an
excedence of both Total Iron and Total Suspended Solid. The September 19 sample was
analyzed for field parameters only. The Mine is requesting the application of Alternate
Limitations (for events less than or equal to the 10-year, 24-hour precipitation event) for
Total Iron and Total Suspended Solids for the September 10 sample event.