ENFORCE35595

• Permit No: M1988112
• IBM Index Class Name: Enforcement
• Doc Date: 1/19/1999
• Doc Name: FAX COVER
• From: PARCEL MAURO PC
• To: BRUCE HUMPHRIES
• Media Type: D
• Archive: No

JAN-19-1999 TUE ]030 AM ~ EL MAURO PC FRX N0. ~ P, 05/05
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~~ of a dremipl group known as ctrbruafad orgatties and ffierefore should lre tested the GC method '
only. Contain was eaaressad at the hearing as to whether a second column eon n would be •
, !'~• conducted te achieve these practical quantilation furaZg, pr. Serdon of the Neafth D ertrneni
Laboratory testified that they routinely use such eonfirtnations b accordance with ih EPA methods.
2 Molybdenum Standard.
Ths Commssion has agreed in response to a proposal by AMAX. Inc, io delete the ous
molybdenum standard from Table 3, Agricultural Standards. The Commesion has ken this action
beOUSe it does not believe that the information suDmiCed in the hearing was adaqu Lb support any
sperafic numerical standard at this time. The Commission has not made a detertnin 'on that
molybdenum poses no rsk to potential benefieisl uses of ground water, If better info aeons
SubmiCed at a later date regardng an appropriate numerical protection level for mot enum, the
Commrs9on wiU reconsider the potential need for a standard at that time.
PARTIES TO TFIE PROCEEDINGS OF
THE PUBLIC RULEMAIQPIG 1iEARUVG
FOR TFiE BASIC STANDARDS FOR GROUND WATER
1, Holme, Roberts !k Owen
2 Yranesh 3 Raisdr
3. Colorado turning Assodation
~. City of Colorado Springs
5. North Front Range Regional Planning Agency
6. Homestake Mining Company
. 7. Rodry Mourthin Or16 Gas Assooation
r!. Amoco Production Company
9. Saunders. Snyder, Ross b Dickson

~.,,
10. Welborn, Dufford, Brown 3 Tooiey •
11. Environmental Defense Fund
41.15
The prwmons of section 258-202(1)(a),(b) and (Z); 25.8-2A3; and 25-8.204; CR.S., provide the specific
statutory authority for adoption of the attached regulatory amendments. The Commission so adopted, in
compliance with section 24~-103(4) C.A.S., the following statement or basis and purpose,
S7ATEIMDE NUMERICAL STANDARDS
Organic Chemigls.
In 1989, the Commssion adopted eenain interen organic pollutant standards, applicable to round water
shatewide. Several revisions and add~ons to tttase interim standards are now being ado b general,
the primary purpose of these changes s >D provide a more thorough system fn assure prole 'on of
Colorado's water tesourses with respect m potential adverse impact, from organic the .One
change adopted's to combine previous Tables A and B m>n a single, consolidated Table A. The
Commssion believes that this tortnat wdl be easier m read, and helps to assure eGminaoon f potential
inconsatendes between the separate tables.
a. Risk-based Water Supply Standards.
When the Comm~sion adopted "urterim organic chemical standards in 1989, the Commbso adopted
standards based on mamnum mrttaminant levels (MCI,s) for aU poUUtar~ for which MCLt lad been
lac.':
5 CCR 1002-41 THE CODE OF COLORADO flFGULATIONS ~
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