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JAN-19-1999 TUE 10;30 AM ~CEL MAURO PC FAX N0. • ~ P. 03!05 ' Page t0 ~I .~ regulations, The Commission has scheduled a rulemakinp hearin0 titer the year fo r revisions to ~., the dsetwpe permit regulations, 6.1.0 (5 CCR 1002-2) to address deseharges to group wa4r. Atth's lime there are no esnIIol regulations governing ground weber impaeh, and no speeafie ulatiorrs of this type have been sedseduled for consideration bythe Commisson. Nowevar, the Com ~ ~ n believes that >t is advsaWe to.have the poled oaf compliance process in place, so tlsat R should not be to 1et~ere the regulation when new control regulations are adopted or• the permit rtgulatior~, are revised. The Commasion intends that detertncsations of a paint e>i complnnce wltltin tiassified ar•~, as well as for statewide standards. by the Divsion w01 be appeahbk. The eoart process for web epp~als would be set forth in amendments to the pertnd regulations or any new central regulation. ~- WHERE T1iE STANDARD IS APPLIED Alter standards, the mast importarrt issue regarding Around water protections the I point at which the starbard should be applied. At what Acid in the aquifer does ooraamination noneompianex9 Among Ure poutl5 considered were the site boundary, the tirrut of ~ eorAamination, or some speeded ttistane:e from the wntamination source. Q eves detetmirsed that the eta boundary should set the outer unit for a pout of eompGan (eoxept for surface water dsrharpes, as eliseussed below) because it dsmsguished areas that a rrsrble party controls from areas where the general public maybe alfeesed. For the inner limit we ch the edge t1f the activity ar eorrhmination source boundary to nrninae the area aflee:tad. These Gnsih consrstent witlr previous Commistion rulRgs on me statewide standards For e»tirp activities esntamination may have. to some etrberd, merged with the immediate tsearourre5ngs, nnldrrp the ooetlarnirration source boundary ddfkirlt and espesssave to define. Wham the ndard6 might be a:Deeded Dory in the immediate vicinity of a source, the east of romediation to avoid the eseeadencB miptR be unjustified in relation m the benefih of remedratiorc Therefore, feu eoistirg aetiviY the . reDldatwn allows tiro Division to establish the point of oomplhnee at a speedfied dmtanoe the ebrrbmination source, faldesg ieto account sits~spseirie fae3s es aexnidance witis exiteria s ed out in the regulation. Applsation of the standards at the apedfie ae~v~ly boundary might not serve th intendrd purpose of avoiding largo e~endrurres for very ittie gait, and yet setting seine large a dunce would be inwtfieiently proteesve_ For those hoi~BS who have emndueied prior inves3gatia b eliseover and map the eneert of emtinp eonmmination, the option clefs to set the point of tmmpGan at the kadasp edge of the plume. For ru.vr ae:tiviti~, new DppoeWs>Ees for site salerban and preparation become available. F r new sites we propose 1o apply the standards at the specitie ae3r3y boundary. N effceX fhis's as as appyirp them atthe spe~afic mntaminadon source (e.g., the point atthe bottom of an lingo ndment at which a leak oexurs), wh0e a0owirp;ome benefd from stxption and dYution in immedrafely jaerent Around, n rase small leaks Demur. ~IQW THE STANDARD IS APPLIF~ The t:omnirasion reemgn¢ed the dil6earlly of eAmplyiig wits a eonoartbation unit standard a feed point r space, when operating wilts the temporal and spatial variatiors urherent in groDrd vrater~low. The iderrt er< erry permit or control regulation should be to pemnt sampling frequeetry and ' elation that adequately rofiecis groundwater quality ruhtion aver time. Owners and operators rho Id have latlhrde n rtes regard provided that an aexeplabk msinum number of samples are takers m each well annually. At the d'senetitm of the owner/operator a shorter sampfery interval maybe empl to ttamorrsir~ that an exeeedenee of standards ~ due too temperel eRet~ This interval shou be demrmirad aRer avaleotirg the aquifers efisetivs peroaiy, hydreuic eonduedivity, and hydra Ge grddisnt (which would govern rates of Aow), and use fate and transport e3rareedertsti s of the poterstial r~~_ _j ._. CCR 1t]02.41 THE CODE OF COLORADO REGULATIONS G •