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 10 30 AM PARCEL MAURO PC FAX N0. •
a an its ntlBtle reEeot~RrostwitoN 20 CR 8, $-97
AII.RIG}CiZtiE4RVED

ocnbrtrrrards. TN's additional effort should help Tdenity seasonal trends n the dab
of the etfeeb of seasonal wriation or slugs of eorrmmirtrdion if praserd'sr tfte sample
dwadeeize spatial variaOTdy, an owner/operator may watr to irtsmti and sample he
and compliance walls. I(svfRoent data s made avatlabk through these additional r
owmer/operatar may employ sh4~ca1 procedures such as moving everagee and fn
eeasonal and temporal effects. lJhlaation of siteapeeifie draradervations fo shatiet
eroeeedenee of standards requires debited knowledge of the sine. For owners/open
methods they should tx aWe m identify the uppemtost aquifer, and aquifers hydraul
beneath the hdlay property, indu6rtg groundwater flow direction and rate. and the I
iderdification.
P, 04/05
Para t1
t pemnt evaluation
To better
nuftiple badCgrourd
anafysir; to reduce
y evaluate an
~ to use these
forfhat
U many sibratione't may benafitlhe arvnerloperamr Ta irsbll itrterrrredpte monitoring . Thaw
monitoring paints could be doser to the source or activity, orwitivn the urtsabaatad m The monitoring
porter could function fo alert Ute ovvnerloperatorto apotential eonbmiafion problem fore it readies tits
poirrt of wrnpianca.
'CONTAMINATION' DEFINITION
~,
C~
eenuse ti'a used several times in the point of mmpfma prove.ions, a definition of Thq term
'oorrbmination' Itas been added 1o the definitions section. Tftis farm's defined broadly to provide a
thnslfold detemrinafion of when nen-naturally oewrtinp pollution is pteserR and to hd identify the
approprbte loofiora for poirrG of compliance. This defeiton doers not detemrete who' responral~le (or
deaninp up arty specific conbminafion. R's not the t;ommssion's invention by th6 definition b
nuke inrividuals respor~sWe for rantamsration posed by others. Nors it the Com 's infenfion b
adopt an antidsgradation standard for groundwater. The regulation does not state That II'eortbmination'
must bs avoided or daaned up; rather, any adopted ground wafer standards remain target for
regulatory activities.
)ac
HYDROLOGICALLY DOWNGRADIENT LIMIT
Contain was ettpressed durhrg the hearing regarding the use of the term 'hydrologinl downgradent
fu'nit' This phrase s commonly used a ffie industry. Generaly, it refers to the •d am• edge of the
ground ureter in question. For eample, 'the frydrologicaly downgradient limit of the a belowthe
ad'erity potentialy impac4ng grouts water quafd~ is located by a vertinl plane at the ' edrate edge of
the surface activity it question, on the ode of the actively toward which the ground vrabr' fiow'eg.
SURFACE WgTER DISCHARGES
The Commssion has itduded ~ sedan 3.11.6 (D) language 1p addee-s poirNs of eem cs for surfari
water discharges that may adversety impact ground wafer. Spepfinlly, the Commssien has added a
cross-referenea fn the Disdrarge Permits System Regulations, where suds poirrty of co pfmnee w61 be
addressed. The CommisAOn also added language b section 3.11.6 (D)(1)(b)(a7 and (D (~(b)(71v add
the qualify of water disdrarged to the factors b tx considered toy the DTvtslon in setturg of
eompGanee.
f3. OT11t=R REVISIONS
1. Table f:omecttarra.
Other dwngea to the Basle Sbndards, first pointed out at the biennial review. irrvo ~ eerteetlons to
bble 1 and table A. b bolo 1 duplicative standards that aro akeady establ'slted in a sb>ewide
standards for radioactive rrraEerels and orgaere pollubnts have been deleted. Into A the detemon
level for the pestiades chlordane, DDT, and dieklrirt were incorrectly fated in the G rmlumn. The
eorreded detection kveJ of 0.1 ugA is now under the GC column hearing. These - ' es are part
THE CODE OF COLORADO REGULATIONS ;~ CCR 1002-41