operation and maintenance annual report …...2 2015 start-up: as noted in the 2013 reservoir...

CHERRY CREEK RESERVOIR

DESTRATIFICATION FACILITIES

OPERATION AND MAINTENANCE

ANNUAL REPORT

2015

i

Prepared For:

Prepared By:

JRS Engineering Consultant LLC 6013 E. Briarwood Drive Centennial, CO 80112 (303) 726-5577 James R. “Jim” Swanson P.E.

CHERRY CREEK BASIN WATER QUALITY AUTHORITY


℅ CHUCK REID CLIFTONLARSONALLEN LLP

8390 E CRESCENT PARKWAY, SUITE 500 GREENWOOD VILLAGE, CO 80111

ii

COVER .………………………………….…………......…………………..…………………….............. PRESENTATION ..……..….………………………………..……………………....……....................... Page i

TABLE OF CONTENTS .….………………………………..……………………....…........................... Page ii

INTRODUCTION.…….………………………………………………………………..……..................... Page 1

START-UP PROCEDURE AND OPERATING POLICY UPDATE................................................... Page 1

2015 START-UP.............................................................................................................................. Page 2

OPERATION PERIOD / INSPECTIONS.…………….………………………………..…..................... Page 2

EQUIPMENT REPAIRS AND MAINTENANCE ………..………………............................................... Page 3

ELECTRICAL USAGE / RATE SCHEDULE........................................................................................ Page 3

RECOMMENDATIONS ...................................................................................................................... Page 3

APPENDIX A - OPERATION POLICY REGARDING ICE

APPENDIX B - DESTRATIFICATION SYSTEM COMPRESSOR START-UP PROCEDURE

APPENDIX C - 2015 AERATION EQUIPMENT OPERATING DATA LOG

APPENDIX D - 2015 ELECTRICAL MONITORING LOG

APPENDIX E - 2015 AERATION SYSTEM MAINTENANCE SUMMARY

TABLE OF CONTENTS

1


℅ Chuck Reid CliftonLarsonAllen 8390 E. Crescent Parkway, Suite 500 Greenwood Village, Colorado 80111

CHERRY CREEK BASIN WATER QUALITY AUTHORITY RESERVOIR DESTRATIFICATION FACILITIES

OPERATION AND MAINTENANCE ANNUAL REPORT

2015 INTRODUCTION: JRS Engineering Consultant LLC was retained under the “Capital Projects Consultant” contract to operate, and coordinate maintenance of, the destratification system including the compressor and aeration system commonly referred to as the Cherry Creek Reservoir Destratification Facilities. This is the eighth consecutive year for operation of the facilities. START-UP PROCEDURE AND OPERATING POLICY HISTORY/UPDATE: Prior to the beginning of the 2014 operating season, the Authority reviewed the prior year's Reservoir Destratification System operating policies and procedures in light of reservoir data collected from system operations for the years from 2008 through 2013. Data collected during this time period (2008 through 2013) indicates that the destratification system provides two primary benefits. One is the reduction in the dominance of blue-green algae as part of the whole algal assemblage and the second is the reduction in the periods when the reservoir is thermally stratified during the summer.1 The data further suggested that operating the aeration system in early spring did not significantly affect blue-green algae (i.e.: cyanobacteria) growth, since the primary cyanobacteria growth period is from June through September when water temperatures are warmer2. The aeration system additionally provides destratification of the reservoir reducing the tendency for the reservoir to "turn over" bringing up anoxic water and higher concentrations of nutrients from the reservoir floor. The data from 2008 through 2013 suggested that the reservoir begins to stratify in late-April to mid-May. After review of the data, it was concluded that operation of the destratification system, beginning in 2014, shall be modified as follows:

a. System start-up shall occur between the dates of May 1st and May 10th. b. System shut-down shall occur between the dates of November 1st and November 15th.

Additionally, operation of the destratification system shall be limited to those times when ice is not present on the reservoir, except under specific scenarios. The "Operation Policy Regarding Ice" policy adopted by the Authority's Board on February 20, 2014 is included in Appendix A. The "Destratification System Compressor Start-up Procedure" approved by the Authority's Technical Advisory Committee on April 3, 2014 is included in Appendix B.

1 CCBWQA January 28, 2013. Compressor Design Basis - Daily Operation, William P. Ruzzo, P.E., Craig Wolf, GEI. 2 GEI, Consultants, Inc. January 2014. Cherry Creek Reservoir 2013 Water Year Aquatic Biological Nutrient Monitoring Study and Cottonwood Creek Pollutant Reduction Facilities Monitoring.

2

2015 START-UP: As noted in the 2013 Reservoir Destratification System Operation and Maintenance Annual Report, the compressor shut down unexpectedly on October 22, 2013. The compressor motor had seized up and required replacement. Prior to the anticipated system start-up date, installation of a new electric motor for the compressor was completed on April 17, 2014. Prior to the start of the 2014 operation of the destratification season, a question surfaced regarding whether, or not, the system should be started to allow for reservoir data to be collected with the destratification system in non-operational mode. This would provide additional water quality data to be collected for the in-progress reservoir modeling effort currently underway. The Authority's Technical Advisory Committee took this question under advisement and at their May 1, 2014 meeting recommended to the Authority's Board that the system not operate during the 2014 season. The Authority's Board, at their May 15, 2014 meeting, approved a change in the Destratification Operating Policy such that the system not be placed into operation for the entire 2014 season. The Authority's Technical Advisory Committee (TAC) took the question of whether the destratification system should operate in 2015 under advisement at their February 5, 2015 meeting and recommended to the Authority's Board that the system not operate during the 2015 season. The Authority's Board, at their February 19, 2015 meeting, approved TAC's recommendation to not operate the destratification system for the entire 2015 season. It was recommended by Power Service Inc., the compressor maintenance contractor, that the new motor and compressor operate periodically during the 2015 season to maintain it in a "ready state" condition incase operation was required. During operation of the compressor, air was blown-off to the atmosphere at the five aeration manholes, located on the north shore of the reservoir. OPERATION PERIOD / INSPECTIONS: The compressor exercise (periodic system operations) was conducted during the summer and fall of 2015, for varying lengths of time and at various "Unload" and "Load" air pressure settings. Prior to each compressor exercise operation an email was sent to Authority representatives, Cherry Creek State Park representatives and the Marina operator, notifying them that the compressor would be exercised that day and air would be blown off to the atmosphere. Since this "blow off" is noisy and located adjacent to the dam trail (now open across the face of the dam for Park users) three orange cones were placed adjacent to the manholes directing trail users to the dam side of the trail. See photo. The orange cones were set up each time the system was operated. The valves in the manholes were adjusted prior to each operation so that each was exercised regularly and all compressed air was discharged through a selected aeration zone manhole blow-off. The orange cones were picked up following each system exercise.

3

The initial compressor exercise was performed on Tuesday, May 26, 2015 at 8:00 AM. The table in Appendix C - 2015 Aeration Equipment Data Log summarizes the operating data recorded each time the system was operated during the destratification system exercise program. Prior to the equipment start-up, the electrical voltage was checked at the compressor. The amperage draw was checked during the compressor operation as well. This information is recorded on the table in Appendix D - 2015 Compressor Electrical Monitoring Log. EQUIPMENT REPAIRS AND MAINTENANCE: ROUTINE SERVICE:

Since the compressor was exercised once a week for a short duration of time during the 2015 destratification system exercise program, regular maintenance to the compressor was deferred to 2016. Aerator inspection, cleaning and maintenance of the in-lake system was performed in 2015. The summary is included in Appendix E - 2015 Aeration System Maintenance Summary. ELECTRICAL USAGE / RATE SCHEDULE: During the 2015 destratification system operation season, the Xcel electrical rate schedule continued through the destratification system exercise program under Schedule SGL.

Schedule SG (Secondary General Service) includes higher monthly demand charges and lower kilowatt usage rates. Operation under this billing rate schedule is more economical when operating the destratification system continuously. Schedule SGL (Secondary General Low-load Factor) includes lower monthly demand charges and higher kilowatt usage rates. Operation under this billing rate schedule is more economical when operating the destratification system in the exercise mode.

The customer service representative from Xcel stated that since the Authority operates the system seasonally, there isn't an issue with changing from one rate schedule to the other during the year to "best fit" the system's seasonal operation. A paragraph will be added to the Destratification System Compressor Start-up Procedure, during its next update, to outline the procedure to establish the Authority's billing rate schedule to the optimum rate schedule for the system's operational status. RECOMMENDATIONS:

The following recommendations are provided for consideration to improve system operation:

Determine if the destratification system should operate in 2016 and if so what that operation procedure should be.

Install a meter to measure and monitor the total volume and rate of air flow (from 2012 annual report).

Install a pressure switch on the discharge pipeline. The switch initiates an alarm when the discharge pressure decreases to a minimum set-point. A “Low Pressure Alarm” would call out regardless of the reason for a compressor shut down: high temperature, power interruption, air line leak, etc (from 2012 annual report).

Incorporate the air conditioner or a form of mechanical cooling for the oil heat exchanger on a permanent basis (from 2012 annual report).

APPENDIX A - OPERATION POLICY REGARDING ICE

Cherry Creek Basin Water Quality Authority Cherry Creek Reservoir Destratification System

Operation Policy Regarding Ice Board Adopted Version

February 20, 2014

Operation of the Cherry Creek Reservoir Destratification System shall be limited to those times when ice is not present on the Reservoir, except under the following scenario: System Start-up before ice is off the Reservoir if either:

1. The Authority has determined that doing so is in the best interest of the Authority to assist in protection of the constructed Pollutant Reduction Facilities (PRF's)1.

2. The Park Manager has determined that doing so is in the best interest of the Park to assist in protecting the Park facilities such as the marina, constructed PRF's, other Park improvements or the unprotected shoreline. Or, has determined that doing so would alleviate a dangerous condition/situation for Park users2.

All start-up and shut-down notifications, decisions, procedures, detail, dates and conditions shall be documented in the Destratification Facilities - Operation and Maintenance Annual Report. Start-up of the destratification system each year shall be performed in accordance with the "Compressor Start-up Procedures". The Authority, at its sole discretion, may shut the destratification system down at any time during the aeration season if, or when, there is no water quality benefit to continued operation.

1 If floating ice is observed on the Reservoir and it is believed that constructed PRF's will be damaged by the

ice, the Authority, authorizes the Authority Manager after consultation with the Authority's engineering, water quality and legal consultant, and the TAC chair, to make the determination on start-up. Prior to start-up of the destratification system, the notification procedures outlined in the "Compressor Start-up Procedure" shall be completed and documented in writing (by email, letter or fax). All start-up decisions, detail and notifications shall be documented and included in the annual report. Board and TAC members shall be notified by email if the system is started under this condition. 2 If the Park Manager notifies the Authority, in writing (by email, letter or fax), that starting the system while ice

is on the Reservoir is in the best interest of the Park, the Authority Manager, with assistance of the Authority engineering and water quality consultants, will confirm that water quality conditions are satisfactory prior to start-up. The Park Manager shall then perform the notification procedures outlined in the "Compressor Start-up Procedure" and provide copies of the written notifications to the Authority Manager. All written notifications shall state the Reservoir conditions and concern prompting the request. Parks shall assist the Authority to confirm no persons are on the ice when the system is started. Once the ice condition is no longer an issue as determined by the Park Manager, the Authority, at its sole discretion, may elect to shut the destratification system down.

APPENDIX B - DESTRATIFICATION SYSTEM COMPRESSOR START-UP PROCEDURE

CompressorStartProceduredraft032514 Page - 1 -

CHERRY CREEK BASIN WATER QUALITY AUTHORITY CHERRY CREEK RESERVOIR DESTRATIFICATION SYSTEM

COMPRESSOR START-UP PROCEDURE March 25, 2014

Start-up Criteria: Operation of the Cherry Creek Reservoir Destratification System shall be in accordance with the terms, conditions and policy set forth in the Destratification System - Operation Policy Regarding Ice; adopted by the Authority's Board on February 20, 2014. This policy requires that operation of the system be limited to those times when ice is not present on the Reservoir, except when early start-up is determined necessary as outlined in the operation policy. An on-site inspection shall be conducted by the Authority's System Operator to verify that ice is not present on the Reservoir prior to start-up. In the event that early start-up is required while ice is on the reservoir, the Authority's System Operator shall confirm that all notifications, responses and other details are completed in accordance with the Destratification System - Operation Policy Regarding Ice. The Authority's System Operator shall then log the detail of the start-up procedure in the Cherry Creek Reservoir Destratification Facilities Operation and Maintenance Annual Report. Start-up Procedure: The system shall be started, following the pre-start system check outlined in the Operation and Maintenance Manual, utilizing the soft-start procedure as follows:

Starting the system shall be accomplished by opening up one aeration zone at a time with some interval (i.e.: 2 to 4-hours) before opening the next zone. A soft start also includes a lower than normal unload / load pressure for start-up of the initial zone (typically 45.0 psi / 39.0 psi) and then increasing the pressure when each additional zone is brought on-line, over the start-up period as necessary to cause bubbles to rise to the surface, until the unload / load pressure reaches 52.0 psi / 48.0 psi with all five zones operating.

Start-up / Shut-down Schedule: System start-up shall occur between the dates of May 1st and May 10th to provide the system operator flexibility in scheduling the start-up, unless early start-up is required.

System shut-down shall occur between the dates of November 1st and November 15th. Start-up Conditions with Ice on the Reservoir: When it becomes necessary to operate the system before ice is off the Reservoir then three conditions need to be considered during start up:

1. The rising bubbles may bring anoxic water from the bottom to the surface under the ice, trapping the fish in an unsafe habitat. Past experience has shown that by using the “soft start” approach, which starts the aeration lines one at a time under or near open water areas, then a hazardous fish environment was not created. Dissolved Oxygen profile information will be provided and analyzed as a part of the start-up procedure.

2. Starting the system prior to March 1 potentially creates problems for CCSP. The aquatic nuisance control program (i.e.: zebra and quagga mussel inspection) requires that all boats be inspected, which begins on March 1st.

3. Starting the system while ice is present on the Reservoir requires written notification to the following parties and written confirmation of their concurrence to start the system while ice is on the Reservoir. All written notifications and confirmations shall be in the form of email, fax or letter.

Cherry Creek State Park (CCSP) Park Manager. Colorado Parks and Wildlife (CPW) Sr. Aquatic Biologist; Platte Basin. Marina Operator. Cherry Creek Basin Water Quality Authority Manager.

Memorandum

To: CCBWQA Technical Advisory Committee and Destratification Sub-committee From: James R. Swanson, PE- JRS Engineering Consultant, LLC, William P. Ruzzo, PE, LLC Date: March 18, 2014 Subject: Destratification System Compressor Start-up Procedure -------------------------------------------------------------------------------------------------------------------------------------- Presented in the memorandum is a summary of the Authority's destratification system compressor start-up procedure, discussion of prior years practice, review and discussion of the water quality data from prior year's operation and resulting start-up procedure modifications to optimize water quality conditions and system operating efficiency. Background: The destratification system consists of a rotary screw air compressor, piping and 116 air diffusers placed at the floor of the deepest part of the reservoir. The system works by pumping air into the bottom of the reservoir providing mixing and oxygenation of the water. The Authority began operation of the destratification system on April 4, 2008. Prior to initial start-up in 2008, it was determined the aeration system would be operated for as long of a season as practical, typically from approximately March 1st through the end of November1. In doing so, continued water quality data monitoring developed a consistent baseline from which to evaluate, and predict, the benefits of operating the aeration system and to manage various water quality parameters within the reservoir. Specific start-up and shut-down dates were previously determined annually based on the Reservoir water quality data, weather patterns, ice cover and other factors. It was found the destratification system needed to operate for approximately two weeks to attain full development of the water column circulation pattern, thereby reducing thermal stratification. Data collected during this time period (2008 through 2013) indicates that the destratification system provides two primary benefits. One is the reduction in the dominance of blue-green algae as part of the whole algal assemblage and the second is the reduction in the periods when the reservoir is thermally stratified during the summer.2 Data Results and Trends: Water quality data collected from 2008 through 2013 suggests that operating the aeration system in early spring does not significantly affect blue-green algae (i.e.: cyanobacteria) growth, since the primary cyanobacteria growth period is from June through September when water temperatures are warmer3. A summary of this data is attached. Cyanobacteria are generally most active at temperature ranges above 15° C, which makes them most active in the summer months. This trend is supported by comparing chlorophyll a concentrations for pre and post-aeration system conditions, as shown in the attached data. Also, the daily maximum ambient temperatures near the reservoir are generally below 15° C from October through April (see attached data) providing further support for a later season system start date.

1 March 1 is the start of the boating season. Allowing boater access to the Reservoir before March 1 required Parks to have their safety

and ANS (Aquatic Nuisance Species, such as Quagga and Zebra mussels) inspection personnel in place sooner, which potentially created an administrative problem. Starting the system before March 1 could clear the ice cover on the Reservoir and allow boaters to launch before Parks was ready. 2 CCBWQA January 28, 2013. Compressor Design Basis - Daily Operation, William P. Ruzzo, P.E., Craig Wolf, GEI.

3 GEI, Consultants, Inc. January 2014. Cherry Creek Reservoir 2013 Water Year Aquatic Biological Nutrient Monitoring Study and

Cottonwood Creek Pollutant Reduction Facilities Monitoring.

The aeration system additionally provides destratification of the reservoir reducing the tendency for the reservoir to "turn over" bringing up anoxic water and higher concentrations of nutrients from the reservoir floor. The data from 2008 through 2013 suggests that the reservoir begins to stratify in late-April to mid-May. This varies from year-to-year, typically caused by an influx of snowmelt in the early spring and/or cold rainfall in the warm summer months causing temperature stratifications. It is noted that the aeration system is effective in minimizing stratification within the reservoir. Conclusions:

1. The aeration system should be operational on, or about, May 15th to minimize the dominance of the blue-green algae (cyanobacteria) growth in the reservoir.

2. The aeration system should be started on, or about, May 1st to provide a fully developed water column circulation pattern by mid-May.

3. Operation of the destratification system beyond mid-November isn't supported by ambient temperature or algal population data for cyanobacteria or diatoms.

In summary, operation of the destratification system shall be modified as follows: a. System start-up shall occur between the dates of May 1st and May 10th. b. System shut-down shall occur between the dates of November 1st and November 15th.


DATE DAY OF

WEEK

TIME OF

DAY

DAILY

RUNTIME1

UNIT

STARTS

MINUTES READING USAGE RUNNING ELAPSED LOADED ELAPSED TOTAL ELAPSED OUTSIDE AMBIENT OUTLET ELEMENT OIL UNLOAD LOAD26-May Tuesday 9:30 AM 47538 35143 15320 4989 53826-May Tuesday 10:45 AM 60 35144 1 15321 1 4989 0 539 66 69 86 425 118 45.0 40.03-Jun Wednesday 11:45 AM 178 47544 6 35147 3 15322 1 4990 1 540 67 73 92 470 126 48.5 44.08-Jun Monday 9:15 AM 81 47545 1 35148 1 15323 1 4990 0 541 77 97 91 355 127 48.5 44.0

18-Jun Thursday 8:50 AM 71 47548 3 35150 2 15323 0 4990 0 542 68 71 87 445 122 48.5 44.022-Jun Monday 7:30 AM 397 35154 4 15324 1 4990 0 543 86 90 90 420 121 35.0 30.023-Jun Tuesday 7:45 AM 430 35158 4 15325 1 4990 0 544 85 90 91 400 124 35.0 30.024-Jun Wednesday 7:40 AM 494 47562 14 35163 5 15325 0 4990 0 544 89 92 91 390 120 35.0 30.025-Jun Thursday 7:30 AM 554 47569 7 35172 9 15326 1 4991 1 547 87 92 98 391 128 35.0 30.013-Jul Monday 8:30 AM 317 47579 10 35186 14 15327 1 4991 0 549 87 92 100 388 135 35.0 30.024-Jul Friday 8:00 AM 101 47584 5 35188 2 15328 1 4991 0 550 82 87 105 484 144 48.5 44.011-Aug Tuesday 7:45 AM 60 47588 4 35189 1 15329 1 4991 0 552 70 77 97 440 138 48.5 44.019-Aug Wednesday 9:15 AM 78 47591 3 35190 1 15329 0 4991 0 553 65 68 92 455 125 48.5 44.014-Sep Monday 7:20 AM 119 47595 4 35192 2 15330 1 4992 1 554 60 78 93 433 140 48.5 44.028-Sep Monday 7:30 AM 65 47598 3 35193 1 15331 1 4992 0 555 57 69 91 484 136 48.5 44.09-Oct Friday 7:35 AM 82 47601 3 35194 1 15332 1 4992 0 556 52 64 80 413 129 48.5 44.0

26-Oct Monday 7:45 AM 87 47605 4 35196 2 15332 0 4992 0 557 51 63 75 423 119 48.5 44.0

OUTLET PRESSURE

Footnote 1 - Daily Runtime recoreded by Mission Controller.

ELECTRIC METER

KWHRS

UNIT HOURS LOAD RELAY

COUNTS (X1000)

TEMPERATURE; DEGREES FAHRENHEIT (°F)

APPENDIX D - 2015 ELECTRICAL MONITORING LOG

APPENDIX D - 2015 COMPRESSOR ELECTRICAL MONITORING LOG

DATE DAY OF

WEEK

L1 - G L2 - G L3 - G L1 - L2 L1 - L3 L2 - L3 L1 L2 L3 L1 L2 L3 UNLOAD LOAD26-May Tuesday 286 286 286 495 496 494 45.0 40.03-Jun Tuesday 287 286 287 496 498 494 119 112 114 70 65 66 48.5 44.08-Jun Monday 286 286 287 495 496 494 119 115 117 71 66 68 48.5 44.0

18-Jun Thursday 284 285 287 494 495 494 119 111 116 69 65 67 48.5 44.022-Jun Monday 284 283 286 493 494 494 118 113 117 71 68 68 35.0 30.023-Jun Tuesday 284 285 286 494 495 493 119 112 119 70 66 69 35.0 30.024-Jun Wednesday 287 286 288 496 497 495 118 110 118 69 64 67 35.0 30.025-Jun Thursday 286 284 286 494 494 492 120 116 117 70 68 67 35.0 30.013-Jul Monday 286 285 287 495 496 496 119 117 118 69 68 66 35.0 30.024-Jul Friday 284 284 285 492 493 491 119 111 115 69 65 66 48.5 44.011-Aug Tuesday 283 284 285 492 493 491 117 112 115 66 64 66 48.5 44.019-Aug Wednesday 286 285 286 494 495 493 119 113 118 68 66 68 48.5 44.014-Sep Monday 285 285 286 494 495 493 121 115 119 68 68 70 48.5 44.028-Sep Monday 286 285 287 496 497 494 120 117 119 70 67 69 48.5 44.09-Oct Friday 286 285 285 493 495 493 119 115 119 69 66 68 48.5 44.0

26-Oct Monday 288 287 288 498 499 497 121 116 120 70 67 71 48.5 44.0

OUTLET PRESSUREMOTOR VOLTAGE MOTOR AMPERAGE

LOADING UNLOADING

APPENDIX E - 2015 AERATION SYSTEM MAINTENANCE SUMMARY

From: Blair WachaTo: Jim SwansonSubject: Invoice Cherry Creek Basin AuthorityDate: Saturday, June 27, 2015 8:29:52 AMAttachments: INVOICE - Cherry Creek Basin Authority 062715.pdf

B&RW _W9_2015.pdf

Hi Jim,

I'm attaching an invoice for work completed to date. We are not yet complete, but should finish within the amount of my original proposal from last month. All of zones 1,3,4 &5 are finished. Zone 2 is complete from 201 - 209. As we've discussed, head #210 is damaged and we've been unable to pull it to the surface.

A few photos from this week... 1 & 2) typical before and after cleaning; 3) disassembly and

cleaning in progress;

4) deterioration of metal fitting; 5) air dispersion at head 210, with automobile on top of it; 6)

red larvae found on several heads, we've never seen this in the past
mailto:[email protected]:[email protected]

Cherry Creek Basin Water Quality Authority c/o Jim Swanson Aurora, CO 80046-0363

Invoice - Annual maintenance on the aerators at Cherry Creek Reservoir. Work to date,

approximately 90% complete with work on the water.

June 27, 2015

1 lump sum Mobilize @ $550.00/ each $550.00

4.5 days 3 man crew work days @ $1,800.00/day 8,100.00

5 days Barge rental @ $325.00 1,625.00

3 man hours Shop labor to clean and repair parts @ $80.00/hr 240.00

4 hours Diving to locate, untangle and free parts @ $150.00/hr 600.00

Total due this invoice $11,115.00

Thank you for the opportunity to serve,

Blair Wacha

President

In general, zones 4 & 5 were buried deeply in soft bottom silt and were much more difficult to

hook and retrieve, probably because maintenance was not performed last year. In two cases, we had to dive to locate heads. In these zones, heads were typically retrieved and dirty to handle, but had less damage than other zones.

Zones 1,2 & 3 were retrieved in generally cleaner condition, but had more build up of a more

rigid algae and showed more damaged parts than zones 4 & 5.

I'll keep in touch with you, when our return date to finish can be more closely anticipated.

See you in a couple of weeks, Blair

From: Wolf, CraigTo: Jim SwansonCc: "Reid, Chuck"; "Bill Ruzzo"Subject: RE: Red Larvae @ CCSPDate: Monday, June 29, 2015 9:56:39 AM

Jim, These are chironomid larvae (aka “blood worms”) common to benthic lake sediment, and their adult life stage is the midge fly. These species are well adapted to environmental conditions of low dissolved oxygen and nutrient rich organic matter. The red color is due to hemoglobin which helps bind oxygen in the oxygen poor environment. Blair is finding these organisms because the aerator heads have worked their way into the active sediment layer where these organisms spend a portion of their life-stage. In years past, when the system was operated the aerator heads likely stayed on the surface of the sediment (over winter) and did not have a chance to sink into the soft sediment layer. Cheers!Craig

From: Jim Swanson [mailto:[email protected]] Sent: Monday, June 29, 2015 7:33 AMTo: Wolf, Craig; 'Bill Ruzzo'Cc: 'Reid, Chuck'Subject: Red Larvae @ CCSP Craig / Bill: Attached please find a photo (PDF format) taken by Blair during the aeration system maintenance work. Blair’s comment was “Red larvae found on several heads, we’ve never seen this in the past.” Any thoughts on what it is and why it may be present this year and not seen in past years?Jim James R. "Jim" Swanson PE

JRS Engineering Consultant LLC6013 East Briarwood DriveCentennial, CO 80112

[email protected](303) 726-5577(303) 484-3833 - fax

mailto:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]

Head location

Clean head & adjust

position, check fitting

tightness

Clean or replace

filter

Upper cam pins replaced

Lower cam pins replaced

Replace cam

leversReplace O Ring

Replace other broken parts

Actual latitude N 39 deg, xx.xxx min

Actual longitude W 104 deg, xx.xxx

min

Stainless Steel Band Clamp Thickness

(new .025") / End of Line Blow Off Valve

Pressure (distribution vault pressure 47 psi) Notes

101 x clean 0 0 0 38.506 51.907 tighten stainless steel fittings

102 x clean 0 0 0 38.476 51.891 took photo typical head

103 x clean 0 1 0 38.444 51.879

104 x replace 0 1 1 lower 38.412 51.869

105 x clean 0 0 0 38.374 51.877

106 x clean 0 0 0 38.358 51.898

107 x clean 0 0 0 38.338 51.932

108 x replace 0 0 0 38.323 51.955 blow off

109 x replace 0 0 0 38.358 51.822

110 x clean 0 0 0 38.336 51.829

111 x replace 0 0 0 38.324 51.845

112 x clean 0 0 0 38.299 51.872


114 x clean 0 0 0 38.349 51.783

115 x clean 0 0 0 38.338 51.737

116 x clean 0 0 0 38.330 51.709

117 x clean 0 0 0 38.376 51.667

118 x clean 0 0 0 x 38.322 51.624 replaced cone

119 x clean 0 0 0 38.310 51.584


121 x clean 0 0 0 38.479 51.992

122 x clean 0 0 0 38.463 52.039

2015 repairs to Cherry Creek aereation system

123 x replace 0 0 0 x 38.437 52.078 replaced cone

124 x clean 0 0 0 38.413 52.115 blow off

Head location

Clean head & adjust


tightness

Clean or replace

filter



Replace cam





min

Stainless Steel Band Clamp Thickness/

End of Line Blow Off Valve Pressure

(distribution vault pressure 47 psi) Notes

201 x clean 0 0 0 38.544 51.828

202 x replace 0 0 0 38.512 51.812

203 x clean 0 0 0 38.482 51.796

204 x replace 0 0 0 38.459 51.772

205 x replace 0 0 0 x 38.436 51.741 changed head assembly, needs shop cleaning


207 x clean 0 0 0 38.382 51.670

208 x clean 0 0 0 x 38.361 51.602 changed head assembly, needs shop cleaning

209 x clean 0 0 0 38.346 51.546

210 x replace 0 0 0 x 38.331 51.484

Had to dive, spent some time working around an automobile that was overturned directly on this head, replaced entire head

assembly, blow off after repairs

211 x clean 0 0 0 38.328 51.418 tighten stainless steel fittings

212 x replace 0 0 0 x 38.363 51.295 replaced cone


214 x clean 0 0 0 38.429 51.199

215 x clean 0 0 0 38.470 51.155

216 x replace 0 0 0 38.512 51.111

217 x replace 0 0 0 x 38.548 51.074 changed head assembly, needs shop cleaning

218 x replace 0 1 1 lower 38.597 51.041 blow off

Head location

Clean head & adjust


tightness

Clean or replace

filter



Replace cam





min




301 x clean 0 0 0 1 x 38.414 51.588 replaced cone

302 x clean 0 0 0 38.445 51.544

303 x clean 0 0 0 38.473 51.488

304 x clean 0 0 0 38.447 51.438

305 x clean 0 0 0 38.419 51.419 blow off

306 x clean 0 0 0 38.497 51.431

307 x replace 0 0 0 38.472 51.393

308 x clean 0 0 0 38.432 51.359

309 x clean 0 0 0 38.395 51.326 blow off

310 x clean 0 0 0 38.518 51.372

311 x replace 0 0 0 38.482 51.319

312 x replace 0 0 0 x 38.441 51.296 replaced eroded hose barb fittings, blow off

313 x replace 0 0 0 38.540 51.329


315 x replace 0 0 0 38.599 51.228

316 x clean 0 0 0 38.625 51.178 blow off

Head location

Clean head & adjust


tightness

Clean or replace

filter



Replace cam





min




401 x clean 0 0 0 38.526 51.636


403 x clean 0 0 0 38.553 51.563

404 x clean 0 0 0 38.579 51.514

405 x clean 0 0 0 38.605 51.459

406 x clean 0 0 0 38.630 51.404


408 x replace 0 0 0 38.687 51.297

409 x clean 0 0 0 38.707 51.248

410 x clean 0 0 0 x 38.738 51.190 replaced regulator

411 x clean 0 0 0 38.766 51.144 blow off

412 x replace 0 0 0 38.493 51.569

413 x clean 0 0 0 38.503 51.544

414 x clean 0 0 0 38.529 51.491

415 x clean 0 0 0 38.543 51.457

416 x clean 0 0 0 38.577 51.395

417 x clean 0 0 0 38.605 51.342

418 x clean 0 1 0 x 38.633 51.294 changed head assembly, needs shop cleaning

419 x clean 0 0 0 38.660 51.237

420 x clean 0 0 0 38.687 51.184 reset regulator

421 x clean 0 1 1 lower x 38.716 51.145 replaced cone, blow off

422 x clean 0 1 0 38.542 51.674


424 x replace 0 0 0 38.587 51.575

425 x replace 0 1 0 38.613 51.526

426 x clean 0 0 0 38.640 51.467

427 x clean 0 1 0 38.666 51.415

428 x clean 0 0 0 38.692 51.366

429 x clean 0 0 0 38.718 51.312

430 x clean 0 0 0 38.749 51.260 too deeply buried to hook, had to dive

431 x clean 0 0 0 38.770 51.209 blow off

Head location

Clean head & adjust


tightness

Clean or replace

filter



Replace cam





min




501 x clean 0 0 0 38.614 51.721

502 x clean 0 0 0 38.647 51.652

503 x clean 0 0 0 38.684 51.582

504 x replace 0 0 0 38.710 51.538

505 x clean 0 0 0 38.735 51.497

506 x clean 0 0 0 38.758 51.447

507 x clean 0 0 0 38.780 51.402

508 x clean 0 0 0 38.804 51.332

509 x clean 0 0 0 38.831 51.285 too deeply buried to hook, had to dive

510 x clean 0 0 0 38.841 51.236

511 x clean 0 0 0 38.638 51.107

512 x clean 0 0 0 38.615 51.109

513 x replace 0 0 0 38.578 51.145

514 x replace 0 0 0 38.553 51.183

515 x clean 0 0 0 38.528 51.232

516 x clean 0 0 0 38.502 51.275 blow off

517 x clean 0 0 0 38.573 51.677

518 x clean 0 0 0 38.589 51.638

519 x clean 0 0 0 38.609 51.589

520 x clean 0 1 0 38.641 51.539

521 x clean 0 0 0 38.659 51.492

522 x clean 0 1 0 38.689 51.432

523 x clean 0 0 0 38.720 51.367

524 x replace 0 0 0 38.744 51.326

525 x clean 0 0 0 38.776 51.275


527 x clean 0 0 0 38.822 51.175 blow off

20151_DestratificationSystem_AnnualReport_Dec20152015_DestratificationSystem_AnnualReport_Dec20152015 Annual_Report textAPPENDIX A DIVIDERAppendix A Operation Policy Regarding IceAPPENDIX B DIVIDERAppendix B CompressorStartProcedure032514Appendix B DestratSysCompStart-upProcedMemo031814APPENDIX C DIVIDERAppendix C - 2015 Aeration Equipment Inspection LogAPPENDIX D DIVIDERAppendix D - 2015 Electrical Monitoring Log

APPENDIX E DIVIDER20152_DestratificationSystem_AnnualReport_Dec20152015_DestratificationSystem_AnnualReport_Dec2015Appendix E - AerationSystemMaintenance SummaryCherry Creek Basin Authority_ProgressRpt

Appendix E2 - RE_ Red Larvae @ CCSPAppendix E3 - AerationSystemMaintenance SummaryCCBA Report 2015

operation and maintenance annual report …...2 2015 start-up: as noted in the 2013 reservoir...

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