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California Regional Water Quality Control Board
Los Angeles Region

320 West Fourtl~ Street, Suite 200, Los Angeles, California 90013
(213) 576-6600 Fax (213) 576-6640
Linda S. Adams http.//www.waterboards.ca gov/losangeles
Acting Secretary for Edmund G. Brown Jr.
Environnzental Protection Governor

April 4, 201 1

Kr ' Mr. Mark Mishler
Chief Financial Officer
Breeze-Eastern Corporation
35 Melanie Lane
Whippany, New Jersey 07981

APPROVAL OF REQUEST FOR MODIFICATION TO WASTE DISCHARGE REQUIREMENTS
FOR DISCHARGE OF TREATED GROUNDWATER AT FORMER PLACERITA CANYON

-. , . FACILITY (a.k.a. SPACE ORDNANCE SYSTEMS), 25977 SAND CANYON ROAD, CANYON
'COUNTRY, CALIFORNIA 91351 (FILE NO. 88-02, ORDER NO. 89-16, CI-6857)

Dear Mr. Mishler:

On February 27, 1989, the Los Angeles Regional Water Quality Control Board (Regional
Board) adopted Waste Discharge Requirements (WDR) Order No. 89-16 for the disposal of
treated groundwater at the former Placerita Canyon Facility in Canyon Country, California.
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k. , ' ,Quarterly groundwater monitoring has been conducted at the site for nearly 20 years. The data
from groundwater samples collected from monitoring wells indicate the extent of VOCs is
localized to two specific monitoring locations at the site. The groundwater data from extraction
well samples collected from the main downgradient extraction well field show that VOCs have
only been detected at two extraction well locations during the past five years (or before). In
addition, a single extraction well located in an upgradient area of the site does not contain
sufficient groundwater to be extracted or treated.

, Additional studies conducted from 2002 to 2009 for the purpose of characterizing either the
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#extent of VOC-impact groundwater or identifying potential VOC source areas did not indicate
VOC-impacted groundwater to extend beyond the two localized areas or identify the presence
of VOC source areas. These additional studies included a soil gas survey, a comprehensive
1 site-wide groundwater investigation, installation of additional monitoring wells and groundwater
sampling, a "hydropunch" investigation, and soil sampling.

Currently, the concentration of only one VOC at one monitoring well locati~n exceeds its
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I maximum contaminant level. As a result, in a letter report dated December 7, 2010,
'* . ' ,Conestoga-Rovers & Associates, on behalf of Breeze-Eastern Corporation, proposed reducing
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the monitoring program sampling frequency from quarterly to semi-annually and the number of
sampling wells from eight to three.

The revised Monitoring and Reporting Program, which incorporates the requested
modifications, is enclosed. This revised Monitoring and Report Program Cl-6857 dated April 4,
201 1, supersedes the monitoring and reporting program dated February 27, 1989.

California Environmental Protection Agency
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*led Paper
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