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Sent By: APPLEGATE GROUP, INC.; 999 OFFICE OF THE STATE ENGINEER Dlvl~inn of water 12r<raurr,c~ I>eparunrrtt of Natur,ll Nrscaur~es LiU Ghhman Sl.eer, huwin ql ll npnvci COlnrndo 802111 Phony: 1.20719Gh-;591 Mx 00519L6-)9tl'1 hnN1/wilrr,.wtc.~n uNrlcl,w ll.hrm 30345266tH a~c~ivc~ aug-tu-Ot [:o[rrni • rape ero ~'.,~i ~ o ~~~~ STATE OF ~'OLOIZADO oc c`o_~. .. may; ,~ s° g, ~~~. ~a~~~~ Bdl rw,.ns AUgll$t 6, 2001 t:nvarnui Mr. Jason Morrow Applegate Group, Inc. 1499 West 120t° Avenue, Suitt; 200 Denver, CO 80234-2728 Re: Mann Lake Gravel Pit, Substitute Water Supply Plan DMG Fife No. M-82-147 SE'/. SE'/. Section 33 <and all of Section 34, T1 S, R67W, 6th P. M. Water Division t, Water District 2 Dear Mr. Morrow: firer r w,li n., Exetmi~+' 116 rnnr Hal n ~~rnnann. Y L 4ale Fur„n-:r This letter is in response to your application of April 5, 2001 and amendment datetl May 2, 2001 requesting a substitute water supply plan for a sand and gravel pit to be operated by Western Mobile, Inc., a subsidiary of Lafarge Corporation (Lafarge), in at:cordance with 37-80-120 C.R.S. The Applicants shall bE~ responsible for compliance with this plan, but the State Engineer's Office may also pursue the landowner for eventual compliance. The required fee of $1,343 for the substitute water supply plan has been paid. You estimate the annual maximum depletion to the South Platte River due to operation of the Mann Lake Pit to be 1(10.6 acre-feet per year. This total includes: 71.1 acre-feet of evaporative loss from approxirately 25.5 acres of exposed lake surface, 26.5 acre-feet of water lost in product (4% moisture of 900,000 tons of raw material) and 3.0 acre-feet for dust cul2trol. The proposed sources of replacement water are anon-tributary Arapahoe aquifer well (Permit No. 55586-F) located near Sedalia, Colorado along Plum Creek, excess Fulton Ditch shares owned by the Applicant and a lease agreement with the City of Greeley for wastewater treatment plant (WWTP) effluent. The non-tributary well is permitted in the name of Mobile Premix Concrete, Inc. antl allows an annual appropriation of 151.7 acre-feet. The permit for this well requires that 2 percent of the water pumped must be directly returned to the Plum Creek drainage. As a result, 148.7 ar-re-feet of water is available from ibis well for augmentation purposes. This ~NCII source also provides replacement water for substitute water supply plans associated wilts three other Lafarge aggregate mining operations. These include the Dunes Development site (M-99-093), the Tanabe Pit (M-00-002) and the Fort Lupton Pit (M-85-088). Replacement obligations, including transit losses, for these sites total 93.9 acre-feet (27.3 acre-feet, 17.3 acre-feet and 39.3 acre- feet, respectively). This leaves approximately 64.8 acre-feet available to offset replacement requirement at the Mann LakE~ Pit. The well is located approximately 35 miles upstream of the aggregate operation. A 0.25 percent per mile transit loss (8.75 percent overall loss) has been accounted for in the replacement schedule leaving approximately 59 6 acre-feet available to offset depletions.