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Home My WebLink About1999-05-11 WSB AGENDAAGENDA ENGLEWOOD WATER AND SEWER BOARD MAY 11, 1999 5:00 p.m. CONFERENCE ROOM A 1. MINUTES OF THE APRIL 10, 1999 WATER AND SEWER BOARD MEETING. (ATT. 1) 2. STU FONDA -CENTENNIAL LEASE AGREEMENT. (ATT. 2) 3. OTHER WATER AND SEWER BOARD MINUTES APRIL 20, 1999 A TT. I 1. MINUTES OF THE MARCH 9, 1999 MEETING. The Englewood Water and Sewer Board Minutes from the March 9, 1999 meeting were approved as written. Mr. Otis moved; Mr. Burns seconded: Ayes: Nays: Members absent: Abstain: Motion carried. 2. SOUTHGATE SUPPLEMENT #143. To approve the March 9, 1999 Englewood Water and Sewer Board Minutes. Burns, Cassidy, Otis, Vobejda, Kasson None Clark, Higday, Bradshaw Habenicht, Burns A request was made by the Southgate Sanitation District representing the owner, Bette R. Mccolley, for inclusion into the Southgate Sanitation District. Supplement #143 is for an area approximately 2.3 acres. The zoning per Greenwood Village is Residential for a single-family residence, with the proposed use to stay the same. The legal is attached as Exhibit A. The property is located north of E. Orchard Ave., south of Belleview and west of Colorado Blvd. in Greenwood Village. The address is 3900 E. Garden Ave. Mr. Burns moved; Mr. Otis seconded: To recommend Council approval of Southgate Supplement #143 to Bette R. Mccolley for 3900 E. Garden Ave. Ayes: Nays: Members absent: Motion carried. Burns, Cassidy, Otis, Vobejda, Kasson, Habenicht, Burns None Clark, Higday, Bradshaw 3. LETTER FROM ED SCOTT DATED MARCH 8, 1999. The Board received a letter from Mr. Ed Scott, a former Englewood Water Board member and mayor, complimenting the current Board on its handling of the McLellan Reservoir property. 4. SEWER TAP AGREEMENT WITH DRURY INNS. In August of 1996 the Englewood Water board was approached by Drury Inn to establish a policy for setting sewer tap fees for hotels. The resulting Water Board policy based sewer tap fees for hotels on a per-day, per unit usage basis. Drury Inns, Inc. is building a hotel in the Southgate Sanitation District near the Park Meadows Mall, and is requesting to use this policy standard for tap fees. As a result, Drury Inns has submitted a Sewer Tap Agreement for Water Board and Council approval. Mr. Otis moved; Mr. Vobejda seconded: Ayes: Nays: Members absent: Motion carried. 5. CENTENNIAL PUMP STATION. To recommend Council approval of the Sewer Tap Agreement with Drury Inns. Burns, Cassidy, Otis, Vobejda, Kasson, Habenicht, Burns None Clark, Higday, Bradshaw Centennial Water and Sanitation District is proposing construction of an additional pumping station to transfer raw water from the McLellan Reservoir to their water treatment plant serving Highlands Ranch. The purpose of the proposed pump station is to increase the District's raw water transmission capacity from 22 mgd to 40 mgd. Centennial leases 65% of the storage capacity in McLellan Reservoir from the City of Englewood. The pump station will be located on the southwest shore of McLellan Reservoir adjacent to the existing spillway and will be fully enclosed in a masonry block building. The Grant of Easement is for a temporary easement for construction with a permanent easement to follow after completion. Mr. Otis moved; Mr. Vobejda seconded: Ayes: Nays: Members absent: Motion carried . To recommend Council approval of the Grant of Easement for the Centennial Pump Station at McLellan Reservoir. Burns, Cassidy, Otis, Vobejda, Kasson, Habenicht, Burns None Clark, Higday, Bradshaw 6. GUEST: DAVID HILL -WATER ATTORNEY. David Hill of Chrisman, Bynum and Johnson appeared to review Englewood's water rights and the impact of the Supreme Court ruling in Golden's case against Arvada, Northglenn, Thornton and Westminster. Downstream cities and irrigation companies filed a lawsuit in 1995 seeking to reduce the use of Clark Creek water, one of Golden's most senior and important water rights. Englewood participated in the Golden case as a friend of the court. 7. McLELLAN RESERVOIR. Mr. Fonda reviewed the McLellan Reservoir property development goals that were discussed with City Council at their April 19, 1999 meeting. A non-profit, Englewood/McLellan Foundation Board will be established to oversee the direction and management of Englewood's McLellan property. The goals are: 1. Protect the quality of Englewood's stored water. 2. Protect the reservoir ecosystem that was developed since access has been restricted. 3. Establish and maximize a future long-term income stream for the benefit of the City of Englewood after meeting the above listed goals. 4. Maintain the quality of the Highline Canal recreational facilities and the wetlands that exist between County Line Road and C-470. 5. Develop the land south of C-470 in a manner that minimizes the impact on McLellan Reservoir. 6. Develop the land south of C-470 in a manner that enhances the quality of the neighborhood of which it is a part. 7. Establish a priority for Englewood residents on public and private facilities where appropriate. The next Water and Sewer Board meeting will be May 11, 1999 at 5:00 p.m. in Conference Room A. Respectfully submitted, Cathy Burrage Recording Secretary Exhibit A -Limits Englewood's lease of raw water not needed by Englewood at the time is divided into three price categories (high, medium and low). The highest price category is based on Englewood's most reliable water, and the other two categories are based on less reliable water. These categories are distinguished by a 10-year moving average delivery and a threshold, as illustrated by the following graph: Price Category Illustration 3000 ------------------------------------------------------------------------------------------------------. Qi ~ 2000 -t-----/ QI ... CJ < c ·;;; 1500 - QI ... QI :? ~ 1000 - 500 - .. -. 7 THRESHOLD I High Price j 0 _.__ ________________________ ...,.,.. ________________________ _. Year The following tables of limits apply to Centennial's obligation to take Englewood's raw water under this agreement in the high and medium price categories. Centennial is NOT OBLIGATED to take water in the low price category, or water above the limits, under any circumstances. However, water Centennial chooses to take above the limits or in the low price category is counted in the 10-year average which separates the medium and low price categories. Water not taken in the low price category or above the limits is not counted in the 10-year average. The first table of monthly limits will be used when this agreement is consummated. The next (second) table of limits will be triggered when Centennial's previous year's raw water demand from all sources [or should this be taps? To be determineef] first exceeds 16,000 acre feet. Once Centennial's total demand has reached 20,000 acre feet in a single year, the third (final) table will comprise the permanent limits that will apply thereafter as long as this agreement is in effect. Centennial's demand as used in this section includes calendar year total treated and untreated water use from ALL water sources, including Englewood deliveries, Centennial's water resources, and supplies from other sources such as the City of Denver or other entities. This Draft Printed 04/19/99 Exhibit A -continued Limits of Centennial's Obligation to take Englewood's Water in Acre Feet (NOTE : Centennial's annual demands in acre feet may be converted into a specific number of taps to trigger these limits before finalizing this agreement) 1. Before Centennial's demand reaches 16,000 AF/yr: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 260 260 260 500 1070 1280 1430 1100 980 320 300 300 AF 2. After Centennial's demand reaches 16,000 AF/yr, but before 20,000 AF/yr: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 390 390 390 750 1605 1920 2150 1650 1470 480 450 450 AF 3. After Centennial's demand reaches 20,000 AF/yr: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 520 520 520 1000 2 140 2560 2860 2200 1960 640 600 600 AF This Draft Printed 04/19/99 Exhibit B -Annual Example of Threshold Operation The table and graph on the following page illustrate a hypothetical operation of the threshold and virtual storage, based on various deliveries of water from Englewood to Centennial. Beginning in 1988, the table shows a 10-year period of 1500 AF deliveries (column B), followed by annual deliveries of 1600, 1700 and 1800 AF. For each year, the threshold, 10-year minimum and 10-year average deliveries are based on the previous year or period, since a new one isn't computed until the current year's values are known. Columns E through J of the table show a storage loop, in which the 900 acre-foot virtual storage reservoir is "filled" and "drained." Columns D through N show the threshold loop, in which virtual storage is combined with current annual deliveries and the 10-year minimum to determine if the threshold should change. Columns P through R show the three categories of water assigned for the current year, based on this year's beginning (last year's ending) threshold, 10-year minimum and 10-year average deliveries. The graph shows the annual delivery as a lightly-shaded bar graph (yellow if color), with virtual storage contents (beginning at 500 AF) as a cross-hatched bar graph stacked on top. The 10- year average delivery is shown as a narrow dashed line (red if color), the 10-year minimum delivery is shown as a wide dashed line, and the heavy solid line represents the value of the threshold. The threshold used during any year is the value computed at the end of the previous year. This hypothetical example of assumed annual deliveries demonstrates the reduction of the threshold through a series of low-delivery years in which virtual storage is depleted as multiple annual deliveries fall below the current threshold. This results in a decline of the threshold as long as these conditions occur. Then, a period of high deliveries fills the virtual storage back to 900 AF. The increase in the threshold doesn't take place until at least 10 years of annual deliveries have exceeded the previous threshold (which has nothing to do with virtual storage). The new threshold then becomes the 10-year minimum delivery for the previous 10-year period. Although the threshold can fall based on a single year's performance, it takes 10 years for it to rise again. The threshold is used to distinguish between the high and medium price categories. The previous 10-year average delivery is used to distinguish between the medium and low price categories. The 10-year minimum delivery is used to determine when and by how much the threshold will be raised after a prolonged (10-year) period of increased deliveries. As stated in Exhibit A, water Centennial chooses to take above the limits or in the low price category is counted in the 10-year average which separates the medium and low price categories. Utilization of monthly limits are not shown on the table or graph on the following page. This Draft Printed 04/19/99 Exhibit B -continued Example Table and Graph of Annual Threshold Operation A B c D E F G H J K L M N 0 p Q R Prev beg thresh paten paten end lower higher net Prev High Med Low 10-yr begin 900 hold thresh star star 900 change change thresh new 10-yr Price Price Price Year Del iv MIN thres star water excess gain loss stor thresh thresh chge thresh AVE Water Water Water 198B 1500 1989 1500 1990 1500 ALL VALUES IN ANNUAL ACRE FEET 1991 1500 1992 1500 NOTE : The hypothetical va lues in this spreadsheet do not include the application of limits . 1993 1500 I I I 1994 1500 THRESHOLD LOOP 1995 1500 I I I 1996 1500 STORAGE LOOP 1997 1500 199B 1600 1500 1500 500 2100 100 100 0 600 0 0 0 1500 1500 1500 0 100 1999 1700 1500 1600 600 2300 100 100 0 700 0 0 0 1600 1510 1600 0 190 2000 1 BOO 1500 1700 700 2500 100 100 0 BOO 0 0 0 1700 1530 1700 0 270 2001 2000 1500 1BOO BOO 2BOO 200 200 0 900 0 0 0 1BOO 1560 1BOO 0 440 2002 1 BOO 1500 1 BOO 900 2700 0 0 0 900 0 0 0 1BOO 1610 1BOO 0 190 2003 1500 1500 1BOO 900 2400 -300 0 -300 600 0 0 0 1BOO 1640 1500 0 0 2004 1400 1500 1BOO 600 2000 -400 0 -400 200 0 0 0 1BOO 1640 1400 0 0 2005 1000 1400 1BOO 200 1200 -800 0 -800 0 -QOO 0 -QOO 1200 1630 1000 0 0 2006 BOO 1000 1200 0 BOO -400 0 -400 0 -400 0 -400 800 1580 BOO 0 0 2007 500 BOO BOO 0 500 -300 0 -300 0 -300 0 -300 500 1510 500 0 0 200B 400 500 500 0 400 -100 0 -100 0 -100 0 -100 400 1410 400 0 0 2009 1 BOO 400 400 0 1BOO 1400 1400 0 900 0 0 0 400 1290 400 890 510 2010 2000 400 400 900 2900 1600 1600 0 900 0 0 0 400 1300 400 900 700 2011 2500 400 400 900 3400 2100 2100 0 900 0 0 0 400 1320 400 920 11BO 2012 2700 400 400 900 3600 2300 2300 0 900 0 0 0 400 1370 400 970 1330 2013 2BOO 400 400 900 3700 2400 2400 0 900 0 0 0 400 1460 400 1060 1340 2014 2500 400 400 900 3400 2100 2100 0 900 0 0 0 400 1590 400 1190 910 2015 2500 400 400 900 3400 2100 2100 0 900 0 0 0 400 1700 400 1300 800 2016 2000 400 400 900 2900 1600 1600 0 900 0 0 0 400 1850 400 1450 150 2017 2100 400 400 900 3000 1700 1700 0 900 0 0 0 400 1970 400 1570 130 201 B 2300 400 400 900 3200 1900 1900 0 900 0 0 0 400 2130 400 1730 170 2019 2700 1 BOO 400 900 3600 2300 2300 0 900 0 1400 1400 1BOO 2320 400 1920 3BO 2020 2500 2000 1BOO 900 3400 700 700 0 900 0 200 200 2000 2410 1BOO 610 90 Hypothetical Englewood Deliveries to Centennial c=:::J Deliveries ~Virtual Storage -Threshold --10-yr Min . -. -. --10-Yr. Ave. 4000 1!3500 u.3000 GI ~2500 -=2000 ~1500 ~1000 GI c 500 0 --~~~~~~~~-~•--a--E·-~·-·--~-~i-~I~ ---• ...-I"'!!"~ _.,ii!"' ______ l'i"'_ I_~ f-~ i i I I ~ _I .... ..,_""~ I I i I I _ r-f-_ ~J _! ~ i . --:_:_ ·. i _ -!=------~--~---'-.--.. -_ -----'-:_:_--~--~ -~If:/ ~"" ----~-~-~-~ -----1 I- --------ni--1~r11-"~ n~~~~~~+.1)- . . . . . . . . . . . . . . . This Draft Printed 04/19/99 Exhibit B -continued General Formulas for Computations in Exhibit B Table: Column: Description/Computation/Formula: A Input data (year) B Input data (assumed annual delivery in AF) c Minimum delivery for previous 10-year period (AF) D Beginning threshold= last year's ending threshold (Col. N) once reaching 1800 AF E Begin virtual storage = last year's Col. J (begin first month at 500 AF) F Col. B + Col. E (threshold water: amount considered to possibly reduce threshold) G Col. B -Col. D (delivery excess over threshold -deficit if negative) H Col. G if positive (potential virtual storage gain -not yet truncated) I Col. G if negative (potential virtual storage loss -not yet truncated) J 0 <(Col. E +Col. H +Col. I)< 900 (end of year virtual storage -must be between 0 and 900) K If Col. F <Col. D, (Col. F -Col. D); otherwise , 0. (amount by which threshold is lowered) L If Col. C > Col. D, (Col. C -Col. D); otherwise, 0. (amount by which threshold is raised) M Col. K +Col. L (net threshold change) N Col. D +Col. M (sum of previous threshold and net change to threshold= new threshold) 0 10-year average of previous deliveries (from Col. B) p Minimum of Col. Band Col. D (High price category delivery in AF -lesser of delivery and thresh.) Q =if(O>P, if (O>B,B-P,0-P),O) (Medium price category delivery in AF -between thresh & 10-Yr.) R =if(B>O,B-0,0) (Low price category delivery in AF -above 10-year average) NOTE: Formula format for "if' statements: =if( condition, if true, if false) This Draft Printed 04/19/99 Exhibit C -Example of Monthly Limits and Price Categories Operation The graph that follows is a monthly breakdown of the three price categories and the application of limits for a high-delivery year (over 5000 acre feet delivered) in which limits AND all three price categories are demonstrated. In general, the high priced water is assumed to be delivered first, medium price next, and low price last. Where monthly limits are less than the water available, and Centennial elects not to accept the excess water available, water in excess of the limits is assumed to be not delivered and does not become part of subsequent 10-year average calculations in this example. In actual practice, should Centennial choose to take water above limits or in the low price category (neither of which it is obligated to take), those deliveries are counted in subsequent 10-year average calculations. For the year 1960 from a simulated yield based on historical hydrology and river calls, certain of Englewood's water rights and water supply contracts were modeled (by Englewood's consultant; Mr. Wood) to produce a monthly yield available to Centennial in excess of Englewood's need for water at the time. The graph on the following page illustrates the application of monthly limits (angled stripe portion of bar graphs) to Englewood's yields, by excluding those yields from further analysis in this study. In this scenario, the angled stripe areas are assumed not taken by Centennial, and not stored or otherwise delivered at a time more convenient to Centennial. They are, in effect, assumed to be spilled from both Englewood's and Centennial's use. The following description includes references to both black and white and color graphs: The darkest shaded area of bar graph (purple if color) represents Englewood's deliveries of high-priced water up to the limits, and up to the 1800 acre foot threshold in this case. Once the 1800 acre-foot threshold has been reached, the shading on the bar graph turns to a gray color (light blue if color), representing the further allocation of water to the medium price category (again, up to the limits). Notice that in the month of May, some of the medium priced water is spilled as well, since it goes over the limit for that month. Finally, the blank bar graphs (light yellow if color) show the remaining yield over the 10-year average delivery, which is the low price category yield. In some years (not this one), there are limits which apply to the low price category as well, but this application is moot, since Centennial is not obligated to take either low-priced water or water available above the limits. Notice that the current limits (dashed line) create a spill situation, whereas the buildout limits (solid line -red if color) would not. In this particular year and scenario, Englewood would not have to spill any water once Centennial has grown into at least a 20,000 acre foot total demand (triggering the buildout limits). While there may be months in which Englewood's water will be spilled even after the buildout limits are in effect, Englewood may have opportunities to manage its water supplies so as to minimize or eliminate those spills, including the temporary use of Centennial's storage space in McLellan Reservoir. This Draft Printed 04/19/99 Exhibit C (continued) Potential Delivery High Price Medium Price Low Price Above Limit 3500 .... Projected Operation from one year in Historical Study Period for a High-Yield Example JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV 513 477 523 361 1276 1193 585 388 288 118 0 260 260 260 361 659 0 0 0 0 0 0 0 0 0 0 411 1193 121 0 0 0 0 0 0 0 0 0 0 464 388 288 118 0 253 217 263 0 206 0 0 0 0 0 0 Englewood Delivery Categories -High Price ~Above Limit -Medium Price Current Limits c:==i Low Price --Buildout Limits DEC toUmax 0 5721 0 1800 0 1725 0 2195 0 938 ~ 3000 -!--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ ~ ~ 2500 c: "' 2000 ~ -... ~ .:::: 1500 -~ c ~ 1000 .c: .... c: 0 ~ 500 0 .. .. .. .. _ - ' --------. JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1960