2011-01-10_HYDROLOGY - M1977348

• Permit No: M1977348
• IBM Index Class Name: HYDROLOGY
• Doc Date: 1/10/2011
• Doc Name: September 2010 Groundwater Monitoring
• From: Golder Associates
• To: DRMS
• Permit Index Doc Type: Hydrology Report
• Email Name: ECS
• Media Type: D
• Archive: No

Golder
Associates ,
January 6, 2011 Project No.: 103-81640
Mr. Eric Scott ?
Colorado Division of Reclamation Mining and Safety
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203,
RE: RESULTS OF THE SEPTEMBER 2010 GI?QI?I?!?WATER MONITORING EVENT NEAR THE
CEMENT KILN DUST DISPOSAL AREA A2 AT THE BOETTCHER LIMESTONE QUARRY,
LA PORTE, COLORADO
Dear Mr. Scott:
On behalf of Holcim (US) Inc. (Holcim), Golder Associates Inc. (Golder) is pleased to present this letter
report describing the activities and results of the September 2010 groundwater monitoring event for the
Boettcher Limestone Quarry (Site) in La Porte, Colorado. This report has been prepared in response to
the letter, File No. M-1977-348; Boettcher Limestone Quarry, Review of Historical Groundwater Data and
Request for Additional Groundwater Sampling, from the Colorado Division of Reclamation Mining and
Safety (DRMS) dated February 18, 2010 to Holcim (DRMS 2010a). All monitoring activities were
conducted in accordance with the procedures described in the Groundwater Sampling and Analysis Plan
(SAP) for the Site (Golder, 2010a), which was approved by DRMS in June of 2010 (DRMS 2010c).
In addition to monitoring groundwater levels and collecting samples for water quality analysis,
supplementary activities were performed to address comments from DRMS in their letter of May 20, 2010
(DRMS 2010b) and as described in Holcim's response to these comments (Golder 2010b).
This letter report documents the following:
¦ Relevant Site information (Section 1);
¦ Field activities performed from late July through September of 2010 (Section 2);
¦ Groundwater monitoring results and validation (Section 3);
¦ Comparison of results to benchmark levels (Section 4); and
¦ Discussion of results and conclusions (Section 5).
Additional details of some activities are presented as attachments to this letter report.
1.0 GENERAL SITE INFORMATION
The Boettcher Limestone Quarry is located in Larimer County near LaPorte, Colorado. More specifically,
the quarry comprises portions of Township 8 and 9 North, Range 69 West of the 6th Principal Meridian.
The original permit to operate the Boettcher Quarry (Permit No. M-77-348) was approved on
October 10, 1978 by the Colorado Mined Land Reclamation Board (MLRB), of the Department of Natural
Resource to Ideal Basic Industries. Although the Boettcher Quarry had several owners during the active
lifetime of the quarry, the quarry is currently owned by Holcim, thus Holcim will be referred to as the
owner/operator in this document.
is\10\81640\0400\gwrep_ nl_06jan11\10381640 holcim gwrep_fnl-Itr 06jan11.dom
Golder Associates Inc.
44 Union Boulevard, Suite 300
Lakewood, CO 80228 USA
Tel: [phone] Fax: [phone] www.golder.com
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