ML20214A095
| ML20214A095 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 11/14/1986 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20214A078 | List: |
| References | |
| NUDOCS 8611190213 | |
| Download: ML20214A095 (43) | |
Text
o Enclosure INSPECTION AND EVALUATION OF THE MIDLAND ENERGY CENTER FOR ADEQUACY OF THE STABILIZATION PLAN MIDLAND PLANT, UNITS-1 AND 2 ENGINEERING BRANCH DIVISION OF PWR LICENSING-B DOCKET NOS. 50-329/330
1.0 INTRODUCTION
Consumers Power Ccmpany (CPCo), by letter dated July 1, 1986 (Reference 1), requested withdrawal of its applications to extend the construction permit (Reference 2) and receive operating licenses for Midland Plant, Units 1 and 2. The ASLB, by memorandura and order of September 26, 1986 (Reference 3), deferred CPCo's motions seeking authorization to withdraw the OL application and dismissal of the OL proceeding, pending preparation'by trie staff, pursuant to 10 CFR @ 51.21, and consideration by the Board of an environmental assessment. Consumers Power Company, by letter dated October 2, 1986 (Reference 4), transmitted the Midland Site Stabilization Report for staff review and use in pre-paring the Environmental Assessment for the Midland Site.
On October 15 and 16, 1986, Theodore Michaels and Gary Staley of NRR, and Ross Landsman of Region III, visited the Midland site to: (1) examine the environmental condition of the site, (2) evaluate the potential environmental impact (excluding monetary and social) on the offsite environment of abandoning construction of ths nuclear power plant, (3) determine whether the st?.5111zation plan submitted b) CPCo con-sidered all critical areas, (4) assure that partially completed A CK 05000329 PDR
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structures would cause no danger to the public or to site users, and I
(5) verify that the nuclear steam supply system has bcen rendered inoperable for purposes of nuclear power production. Representatives of CPCo for the meeting and site inspection included; J. A. Mooney, B. H. Peck, W. R. Bird, R. F. Green, J. A. Hay, W. F. Sabo, and R. H. Wieland.
2.0 EVALUATION General Site Stabilization. On July 16, 1984 the Board of Directors of CPCo ordered shutdown of design, construction, and testing activities for the Midland Plant. Critical activities were to secure the remedial soils work, place the plant systems and equipment in a long-term layup mode, implement a preventive maintenance and storage program, and demo-bilize the construction forces. The purpose of these activities was to maintain the plant in such a way as to preserve the option to restart the project.
l Critical site stabilization actions included draining the cooling pond, filling open excavations, improving site drainage, grading, and seeding, t and placing riprap in vulnerable areas. CPCo states that no additional l
l actions are presently necessary for the environmental protection of the site in the shutdown condition. Some activities of a maintenance nature continue and are described in the following sections. Future actions l
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associated with other industrial site use would fall under the purview of the Michigan Department of Natural Resources (MDNR). Donald L. Inman, Chief, Environmental Enforcement Division, MDNR, is responsible for assuring compliance with State environmental laws. His office telephone number is 517~373-3503 and his address is Michigan Department of Natural Resources, Box 30028, Lansing, Michigan 48909.
Site Status. On April 8, 1986, the Company's Board of Directors authorized conversion of Unit 1 of the Midland Project to a natural gas-fired, combined-cycle generating plant. 0n June 18, 1986, the Board authorized abandonment of the nuclear steam supply systems and other buildings and components of the Midland Project, which are not useable for the gas-fired, combined-cycle plant. An environmental report was submitted on July 11, 1986 to the Department of Energy Economic Regulatory Administration in support of an exemption from the Fuel Use Act of 1978. Site construction (e.g., demolition of unneces-sary buildings, extension of fill area for gas turbines) would begin no earlier than 1987. On September 17, 1986, the Dow Chemical Company i
l and Consumers Power Company announced that they had reached an agree-l ment in principle to work together to convert the plant into a natural-gas combined-cycle cogeneration plant.
l Overall, the currently existing facilities will remain in place.
Figure 1 is an aerial view of the site taken in August 1983. As
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can be seen, construction utilized nearly all of the available area.
Figure 2 is an April 1986 aerial view looking northeast toward the power block area with the Dow industrial facilities in the background.
The major portion of salvage activities has been completed, however, residual activity will continue through the end of 1986 and beyond.
Many of the non-permanent buildings will continue to be used as ware-housing for salvageable equipment and support of future construction.
Facilities not normally occupied are locked if there are hazards associated with unauthorized entry. A security force has remained in place to control site entry and to maintain routine site security inspections.
The staff concludes, based on our site inspection of October 15 - 16, 1986, that the site is environmentally stable and will not induce any adverse offsite environmental effects. Figure 1 shows five segments of the site (A through E) which are discussed below.
A. Power Block Area Area A includes all of the area "on the hill" (elevation 634 ft msl) and the property north of this area to the river, comprising a total of about 52 acres. Construction has utilized nearly all of this property. Figures 3A and 3B show all of the structures on the site with reference numbers. Table 1 identifies the structures by reference number.
For construction of the Gas Conversion Option, the Project Field Office (24), Change House (23), Welders Test Shop (22), Site Access Control Building (20), and Support Service Building (21) would all be removed and the gas turbines would be placed in the area these structures occupy. CPCo states that it does not plan to dismantle any of the other structures. CPCo states that the following structures will be abandoned regardless of the final site disposition:
Unit I and 2 reactor buildings (1 and 2)
Auxiliary Building North of Column Row "G" (3)
Radwaste Building (7)
Calibration Building (26)
Cooling Tower (41)
CPCo states that it plans to utilize the remaining structures shown in Area A on Figure 3A in the gas-fired, combined-cycle power plant.
It states that debris has been and w- continue to be disposed of in a licensed landfill, and hazardous wastes were disposed of by utilizing licensed contractors.
Sheets 1 and 2 of Figure 4 show some general photographs of the stabilized condition of Area A. Photographs 1 and 2 show some of the perimeter road on the raised (el 634) portion of the l
I plant. Most of the area is graveled. Photographs 3 and 4 show a collection settling basin (riprapped) for runoff from Area A and the riprapped outlet to Bullock Creek. Photographs 5 and 6 show a drain to the Tittabawassee River for runoff from the 634 eleva-tion of the plant and a portion of the river floodplain. Photo-graphs 7 and 8 show the Blowdown and Intake structures and a portion of the river floodplain. A portion of the runoff from the 634 elevation is collected by catch basins and storm drain systems and diverted to the cooling pond. The remainder is collected through controlled drainage facilities and diverted to Bullock Creek and the Tittabawassee River. This area is well stabilized and there is no evidence of erosion or other adverse impact to the offsite environment.
At the time of project shutdown, the underpinning work in progress was reviewed by CPCo and a plan was developed to stabilize the structures. This plan was implemented. CPCo states that activities required for stabilization were concurred in by Region III and verified by site inspections as documented in Inspection Reports (50-329/84-22 and 84-24 and 50-330/84-23 and 84-27). CPCo states that monitoring of the area since that time has confirmed the adequacy of the building underpinning in its present configuration. The staff believes this means that there
I has been no settlement of the involved structures and the new concrete piers. By letter dated October 28, 1986 (Reference 5)
Inspection Reports 50-329/86001(DRP)and 50-330/86001(DRP) were transmitted to Consumers Power Company. These inspection reports conclude that the partially completed underpinning and layup grouting has left the building in a safe and stable condition that can cause no danger to the public, if left as is. The report also acknowledges that if the cooling pond is ever re-filled, something will have to be done to the' partially completed under-pinning to alleviate the possibility of soil washouts (the positive gradient would induce flow to the excavated area, thus possibly making the building unstable). Figure 4, Sheet 7, Photographs 25 and 26 show general views of the Auxiliary Building underpinning.
In the interest of rendering the plant inoperable as a nuclear facility, CPCo has cut several of the steam supply system water lines and states that it plans to cut several others. Figure 4, Sheet 6, Photograph Nos. 21 through 24 show the area where lines are to be cut and actual cuts already made.
b
B. Access Road and Parking Areas Included in this 95-acre area (see Figure 1) is all the site property north of the cooling pond dike and west of the raised power block area, and a narrow strip along the access road.
Bullock Creek borders this area on the north. Except for the extreme westerly end, all of the area between the pond dike and Bullock Creek has been utilized for parking and roads.
There is a drainage system in place for this area. Structures for this area are listed in Table I and shown on Figures 3A and 38.
The parking areas are hard-packed surfaces. Concrete parking piers and fencing remain in place. These parking areas will be retained for future construction and operation. There are no plans to remove the 100-meter meteorological tower located on the edge of the site boundary, directly west of the power block area. Met tower routine maintenance includes assurances of structural integrity and obstruction marking.
A stockpile of fill material remains on the south side of the access road (see Figure 4, Sheet 4, Photograph No. 16). At the time of the staff inspection, a portion of this stockpile had been recently removed, leaving a portion of the remaining pile l
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-9 unvegetated and subject to some erosion. The area around this stockpile 1s heavily vegetated and a considerable distance from 2
Bullock Creek. The staff concludes that it is unlikely that any significant amount of erosion would reach Bullock Creek.
The staff concludes that this area is environmentally stable and there will be no significant adverse environmental impact offsite.
C. Poseyville Laydown Area This approximately 68-acre area is located off, but adjacent to, the site. It extends from the west side of the cooling pond to Poseyville Road. An underground drainage system was installed.
during its construction. The surface consists of a 4 to 12-inch thick layer of crushed limestone.
The laydown area contains cribbing and temporary storage struc-tures for construction materials and plant equipment. The area will continue to be used for storage and for the future gas-fired, combined-cycle plant construction. CPCo has committed to dispose of the resulting debris in a licensed landfill area when the temporary facilities are removed.
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-r ,. - _ . _ _ _ , ._. _ _ __ ._, .- - _ _ .
This area was inspected by the staff and found to be environ-mentally stable with no potential for offsite adverse environ-mental effects.
D. Cooling Pond Area The cooling pond Area consists of the 880-acre cooling pond, the strips of land outside the west and south pond dikes (about 90-acres), and the 148-acre Tittabawassee River floodplain east and northeast of the cooling pond. The narrow strips of land bordering the dike perimeter contain pond and dike ditches and
, the rerouted agricultural drains which formerly flowed through the cooling pond area. The floodplain area contains several transmission line towers and start-up line poles, the cooling pond dikes, the railroad bridge, the pond outlet structure, and the emergency access road.
Following the July 1984 determination to halt construction of the Midland Nuclear Plant, Consumers Power Company obtained MDNR approval of a Cooling Pond Dewatering Program. Dewatering was necessary to allow for the demobilization of the temporary dewatering wells and the freezewall system associated with the auxiliary building underpinning. The main objective of the pro-gram was to control the potential environmental impacts associated i
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with the dewatering and the ongoing maintenance of the cooling pond and related site runoff water.
The major program elements included initial dewatering of the pond at discharge rates that were environmentally acceptable and that would not exceed State water quality standards for the Tittabawassee River; to the extent practicable, relocating cooling pond fish to the river; and providing for the collection and appropriate disposal of organic materials from the pond.
Staff of the MDNR Environmental Enforcement, Surface Water Quality, Fisheries, Groundwater Quality, Wildlife and Air Quality Divisions, 4
and a representative of the Michigan Department of Public Health were designated to review various aspects of the CPCo's dewatering proposal for approval (Reference 6).
l CPCo received, from the Michigan Water Resources Commission (MWRC),
NPDES Permit modifications to completely dewater the cooling pond and to discharge stormwater runoff and site dewatering from the dewatered pond. Notice of the revised Permit was published in September 1984. The revised Permit was discussed before the Michigan Environmental Review Board in October and was issued by the MWRC on October 18, 1984 (Reference 7).
The revised NPDES Permit authorizes pond dewatering and contains a number of special conditions designed to address environmental matters. The Cooling Pond Dewatering Program Summary Report (Reference 8) describes the pond water discharge, water quality, fish relocation, residuals management and avifauna observations from the 1984 dewatering program. These activities were conducted in accordance with the requirements of NPDES Special Conditions 30, 31, 32, and 33.
Special Condition 29 of the Permit required the submittal and approval of a Cooling Pond Maintenance Program to control storm-water runoff and site dewatering discharges. The CPCo is continuing to implement this MDNR approved program. While the site remains in caretaker /layup status, the Cooling Pond Maintenance Program con-trols site stormwater drainage, site dewatering and pond area run-l off. Attachment 1 includes a copy of the program including a sketch 1
of the site showing the location of the water discharge. Following the initial dewatering, several small dams and a settling basin were built internally in the cooling pond and the banks of an internal I
drain were seeded with grass. The MDNR District Supervisor approved
! the Cooling Pond Maintenance Program and the Cooling Pond Dewatering l
l Program Summary Report (Attachment 2). After a site visit in early i
September 1985, he found the Maintenance Program to be satisfactorily implemented. No additional federal, state, or local approvals were found to be necessary at that time for site layup.
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The 880-acre cooling pond comprises over 70% of the 1235-acre plant site. Additionally, stormwater drainage from the power block area drains into the cooling pond. The Cooling Pond Maintenance Program continues to control erosion and sediment discharge from the cooling pond as s'torm water is discharged in accordance with the NPDES Permit. All measures of that program have been implemented. As of early fall 1986, the pond appears to have about 85% vegetative cover.
There is no danger of the main cooling pond filling with excess rainfall and overtopping the levees, even if the outlet were blocked.
The annual evaporation rate of about 38 inches greatly exceeds the average annual rainfall of about 29 inches and since there is no contributing drainage area outside the pond dikes, except the small (about 10 acres) raised (634 elevation) plant area, there can be no significant accumulation of rainfall in the main pond. This is not true for the emergency cooling pond, since there is considerable contributing drainage area from the main pond and the evaporation rate may not be sufficient to remove the rainfall runoff without pumping. Therefore, if CPCo were to completely abandon this site, it would be necessary to provide a gravity drain for this portion of the pond to preclude eutrophication and an undesirable mosquito breeding habitat. This regulatory responsibility should be assumed by the MDNR under the revised NPDES Permit.
CPCo has no plans to remove or add any structures in the cooling pond area. All the existing structures will be used in the gas-fired, combined-cycle power plant. There is an ongoing program to control vegetation along the security fence and to monitor dike integrity.
Figure 4, Sheet 3, Photograph Nos. 9 and 10 show the inlet to the pond outlet structure and the upstream settling basin. Photograph Nos. 11 and 12 show the excavated emergency cooling pond. This portion of the pond does not drain by gravity and rainfall accumu-lation must be pumped from this part of the pond. Photograph No.13 shows the riprapped outlet channel to the Tittabawassee River from the pond outlet structure. Photograph No. 14 shows a dumped-concrete energy dissipator for a grade change on South Dike. There are several of these and they are effective in controlling erosion.
The ditch is stable. Photograph No. 15 shows a straight drop spill-way stilling basin on Waite and Debolt Drain. This drain is also stable and well vegetated in the site area.
l l Based on the staff inspection of this area, we conclude that it is environmentally stable and there should be no significant offsite adverse environmental effects.
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E. Transmission Corridor There are two 138 kV start-up lines. One line terminates at one of the start-up transformers and extends approximately 950 feet to tap an existing circuit at a tower on the plant site.
The other line terminates at the other start-up transformer and extends to a single circuit type TH tower utilizing intermediate wood poles. The remainder of this line adjacent to the dike to Gordonville Road utilizes single wood poles with davit arm structures.
From there along Gordonville Road to the Tittabawassee substation the line is supported on steel towers. The area disturbed by con-struction (completed in 1980) for the 138 kV lines was minimal.
Two 345 kV bus tie lines originate at the turbine building wall of the plant and extend across the north pond area with structures located adjacent to the dikes. The lines parallel an existing 138 kV tower line and go to the Tittabawassee Substation. The area disturbed by construction (completed in 1982) for these towers was approximately 0.05 acres.
The Tittabawassee to Kenowa/Thetford line is located in an existing corridor that was pJrchased prior to 1982. Double circuit towers were utilized. The corridor, excluding the wider, 1 mile long I
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exit at Tittabawassee, will accommodate two 345 kV tower lines.
The first 8.0 miles south from the Tittabawassee exit also accommo-dates two 138 kV tower lines and the next 7.6 miles accommodate one 138 kV tower line. A 138 kV line (construction completed in 1983) is located 100 feet east of the existing 138 kV line.
The length of the line is 27.3 miles. The average area disturbed for installation of each set of tower anchors is a 40-foot square.
A total of 153 towers required for the entire line caused the dis-turbance of 5.6 acres of land, exclusive of any compaction by construction vehicles along the tower centerline.
Right-of-way maintenance is an ongoing activity. Consumers Power Company's methods of maintenance comply with existing Federal and State guidelines pertaining to approved maintenance practices of transmission line rights-of-way. Tree and shrub screcns estab-lished during construction clearing are preserved and maintained by selective manual trimming or removal. Only selected tree species are removed either manually or with herbicide.
All herbicide application is performed only as directed by Federal and State Laws by commercial applicators licensed by the State of Michigan. Only those herbicides approved by the Environmental
Protection Agency for utility right-of-way application are used and they are applied in strict compliance with manufacturer's recom-mendations. Field operations are supervised by trained foresters certified by the State of Michigan to assure compliance with the Consumers Power Company Tree Clearing Specifications and Job Methods Manual.
The staff inspected selected portions of the transmission corridors shown on Figure 4, Sheet 5, Photograph Nos.17 through 20. The corridors are predominately through farmland that has reverted to its natural state since construction. There is no evidence of any adverse environmental impact.
3.0 CONCLUSION
S The Midland Energy Center Site has been environmentally stabilized.
Ongoing stabilization activities are of a maintenance nature appro-priate to any industrial facility. The staff concludes that the Midland site is environmentally acceptable with regard to the revo-cation of Construction Permits and the request for withdrawal of the Operating License applications.
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REFERENCES i 1. CPCo (J. W. Cook) letter to USNRC (H. R. Denton) dated July 1, 1986,
Subject:
Midland Energy Center Docket Nos. 50-329 and 50-330 Withdrawal of License Applications.
- 2. CPCo (J. W. Cook) letter to ASLB dated April 21, 1986
Subject:
Request for Inactive Status.
l
Subject:
Motion to Discuss / Terminate Proceedings.
1 4. CPCo (J. W. Cook) letter to USNRC (H. N. Serkow) dated October 2,1986,
Subject:
Response to Request for Clarification for Environmental Review, l Serial 32848.
1 5. USNRC (W. G. Guldemond) letter to CPCo (J. W. Cook) dated October 28, 1986,
Subject:
Transmittal of Inspection Report Nos. 50-329/86001 (DPR)and 50-330/86001(DPR).
- 6. MDNR (J. D. Bails) letter to CPCo (P. C. Hittle) dated August 28, 1984,
Subject:
Midland Cooling Pond Dewatering Program.
!' 7. MDNR (W. E. McCracken) letter to CPCo (P. C. Hittle) dated October 18, 1984,
Subject:
NPDES Permit No. MI0042668 Midland Nuclear Power Plant.
- 8. CPCo (P. B. Latvaitis) letter to MDNR (P. C. Zugger) dated June 12, 1985,
Subject:
Midland Cooling Pond Dewatering Program Summary Report.
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TABLE 1 STRUCTURES - MIDLAND SITE (Locations on Figure 3A and 38)
- 1. Reactor Building - Unit 1 -
- 36. Portable Shed
- 2. - Reactor Building - Unit 2 37. Nitrogen Storage Shed
- 3. Auxiliary Building 38. Borated Water Tank Access Enclosure
- 4. Turbine Building 39. Primary Make-Up Water Tank Access Enclosure
- 5. Diesel Generator Building 40. Borated Kater Tank Access Enclosure
- 6. Administration Building 41. Cooling Tower Stair Enclosure
- 7. Solid Radwaste Building 42. Temporary Paint Shop
- 8. Technical Support Center 43. Tecporary Paint Shop
- 9. Evaporator & Auxiliary Boiler Bldg 44. Storage Building
- 10. Combination Shop 45. Storage Tent
- 11. Oily Waste Treatment Facility 46. Owens Corning Warehouse
- 12. Make-Up Water Pump Structure 47. Temporary Storage Building
- 13. River Intake Structure 48. Temporary Storage Building
- 14. Fond Blow Down Discharge Structure 49. Temporary Plant Heat Boiler Building Fla=mable Gas & Liquid Storage Bldg
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- 15. 50. Portable Shed
- 16. Service Water Pump Structure 51. Temporary B&W Building
- 17. Circulating Water Intake Structure 52. Temporary Client Building
- 18. Chlorination Building 53. Stair Enclosure
- 19. Permanent Guard House 54. Brass Alley
- 20. Secondary Access Control Building 55. Warehouse Number 2 ,
- 21. Support Services Building 56. Warehouse Number 2 Office Area
- 22. Welders Test Shop 57. Meteorological Tower Data Collection Ctr
- 23. Change House 58. Trailer
- 24. Project Field Office 59. Shed I
- 25. Warehouse Number 1 60. Trailer
- 26. Calibration Facility 61. ZACK Fabrication Shop
- 27. Dow Condensate Return Pump House 62. ZACK Storage Building
- 28. Temporary Receiving Guard House 63. B&W Fabrication Shop
- 29. Temporary Shed 64. Huber's Trailer (Sub-Contractor Owned)
- 30. Temporary Shed 65. Mergentime Maintenance Shop I
l 31. Temporary Steel Building 66. Storage Building
. 32. Temporary Shed 67. Pump House
- 33. Lean-To Storage Shed 68. Outage Building i
34 Mechanic's Shop 69. Main Gate Guard House
- 35. Carpenter's Shop
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- o p, UNITED STATES p, NUCLEAR REGULATORY COMMISSION
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Attachment 1 t, C011 Sum 8f3 Q
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Paul C Hittie Drrector, Enormnmenul Departnicnt General Of f aces:
212 West Michi9 en Avenue Jackson, MI 49201 e f 517) 7881930 Dece=ber 17, 1984 Hitt 114-84 Mr Paul D Zugger, Chief Water Quality Division Department of Natural Resources PO Box 30028 Lansing, MI 48909 Dear Mr Zugger My letter of September 28, 1984, transmitted the Midland Cooling Pond Mainte -
nance Program Permit 0042668. in accordance with Part I.A.29 and Part I.C.12 of the NPDES Attached is a copy of the revised program. This revision is based on the comments provided by Terry L Valkington in his November1984 20 letter and during his site visit on December 12, 1984 ,
O below, which will be implemented shortly.All components of the pr Part I.A.1) will be co=pleted in , December 1984. Pond devatering discharges (Permit Road installedculvert and the during December dam 1984 or ason soontheastrench to the Service freezing conditions allow Water Inta
. Pumps Grass upring of 1985. seeding of the banks of the former Waite-Debolt D e We would appreciate your approval of this program. If you have any questions about the program, please call P B Latvaitis at (517) 788-1975.
Yours very truly l-PCH/RFG/fch CC JDBa11s, DNR BW.arguglio, JSC-220A TWalkington, DNR
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. 1 COOLING POND MAINTENANCE PROGRAM After complete dewatering of the cooling pond, the Cooling Pond Maintenance Program is conducted to control the suspended solids concentration in storm-water runoff and site dewatering discharged from the cooling pond. The program is designed to collect and discharge stormwater and associated de-watering well disc'harge. There are three primary areas of water accumulation; the emergency cooling water reservoir (ECWR), the circulating water discharge (CWD) structure area and the area near Outfall 003.
Site storm drainage (as identified in the NPDES Application, Revision 3, submitted November 11, 1981) and water from rainfall and associated site dewatering well discharges accumulates in the ECWR and CWD areas. The area near Outfall 003 contains water pumped from the ECWR and CWD, rainfall and pond area runoff. Most of the 880 acre cooling pond either slopes toward Outfall 003 or is drained to the former Waite-Debolt Drain which conveys water to the area near Outfall 003. Discharge will be' conducted from outfall 003 in compliance with Part I.A.2 of NPDES Permit 0042668.
The attached sketch of the cooling pond shows the location of the former Wa.ite-Debolt Drain on the pond bottom and the location of a drainage ditch from the ECWR to the area near Outfall 003. Also shown are the pump loca-tions, the settling basin for ECWR pumped discharge, the backwater areas along the drainage ditch from the ECWR to the outfall, the aggregate dam above the former Stewart Road culvert, the backwater area behind this dam, and the pooled area near Outfall 003. Water accumulating near the CWD structures is pumped over the baffle dike into the emergency cooling water reservoir. Water MIO984-6867A-EN02
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t accumulating in the ECWR is pumped to a settling basin and then flows to the backwater on the ditch leading to Outfall 003. This backwater area formed'by high points on the. ditch slows velocities and reduces suspended solids concen-trations. Outfall 003 is normally closed. The discharge gates are opened when visual inspection of accumulated water indicates the effluent will be acceptable.
Several additional features maintain low total suspende'd solids concentrations in the collected stormwater discharged from Outfall 003. The inner slopes of the cooling pond dike and the baffle dike are protected with riprap. The riprap extends from the dike crest (632 ft MSL) to the toe of the dike or to elevation 615 ft MSL, whichever is higher. The 18 in thick riprap layer rests on a 12 in thick crushed rock bedding layer. Where the dike slope extends below elevation 615 ft MSL it is protected by a 12 in layer of crushed rock to the toe of the dike. Therefore, rainfall and runoff are not expected to cause erosion of these dike slopes. Water pumped from the CWD structures area is released directly onto the riprapped east slope of the baffle dike, using this surface as a controlled spillway into the ECWR. A small dam across the trench connecting the ECWR with the Service Water Intake (SWI) prevents water accumu-lating in the ECWR from seeping into the plant area. The small pool between this dam and the SWI is pumped as needed, onto aggregate into the ECWR. In l
the emergency cooling water reservoir the water depth is maintained at a minimum of about 2 ft by pumping. This depth minimizes the possibility of 1
pumping water with high suspended solids concentrations. Localized sumps for the pumps maintain desired pumping levels while minimizing suspended solids releases. Water pumped from the ECWR is released to a 75 f t diameter, 4 f t HIO984-6867A-EN02
,' 3 deep, riprap lined settling basin adjacent to the ECWR and about 1550 ft from the Outfall 003 structure. The suction points of pumps in the ponded areas are in cages off the bottom of the sump to minimize suspended solids concen-trations in the pump' discharge.
An aggregate dam just above the former Waite-Debolt Drain culvert under the former Stewart Road forms a backwater along the lower portion of the former drain to slow water velocity and reduce any suspended solids concentrations.
Additionally, with the discharge gates on Outfall 003 normally closed, a backwater pool forms to about elevation 602-603 ft MSL at the outlet. Again, this pool reduces velocities from all contributing sources and allows any suspended solids to settle.
1 The cooling pond bottom is expected to revegetate naturally. Additionally, grass seeding of the banks of the former Waite-Debolt Drain will also form a sediment filter and help to stabilize the banks.
The discharge gate at Outfall 003 will be opened periodically (after suspended solids have settled) to allow discharge of the stormwater to the river.
12/17/84 MIO984-6867A-EN02
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I State Offico Building 411-J East Genesee Saginaw, Michigan 48607 September 26, 1985 l
!ir. Paul C. Hittle Consumers Power Company 212 W. Michigan Avenue.
i Jackson, Michigan 4 9201 J
Re: Midland Cooling Pond Maintenanco Program and Midland Cooling Pond Dewatering Report Dear Mr. Hittlet This ' documents approval of the Midland Cooling Pond :taintenance Program submittod to the Chief of our Divion on December 17, 1984, and the !!idland Cooling Pond Dewatering Program Summary Report submitted June 12, 1985.
The December 1984 submittal included revisions we requestod in
!Iovember 20, 1984, correspondence and a December 12, 1984, cito v isit .
Program.
All prior review comments woro satisfied in the revised This approval has been delayed becottse of questions rogarding the operators' cortification which woro discussed exton-nively with lir. Ron Fobos du-ing the period December 1984 through February 1985.
l Part II . A . 3 . o f !!PDES Pe rmit No . !!I-0042 668 re-quires, "The permittee shall have the waste treatment facilities under the direct supervision of an operator certified by the
!!ichigan Wator Rosources Commission, as requirod by Section 6a of the Ilichigan Act. "
The facilitics are classified Aid and A2f.
Another site visit was made by the writer on September 6, 1985, whoroby a tour was provided of the pond by company representa-tivos. Wo found the !!aintenance Program to be satisfactorily implemented.
In fact, the runoff control measures were very successful in controlling erosion and sediment dischargos after approximately eight inches of rain in three days -lust prior to tho visit.
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'!c .indoratand that tho i==ue of oporator cortification will bc ro olved by cufficient numbers of ooerators taking the Indu: trial So:tification Q:sm this Novombor to havo qualifiod cortified personnel on site at Midland in the futuro. Uo roquoct your rocponse at a lator dato to list the pornonnel so cortified who are do.signated responsible for the Cooling Pond !!aintenanco P- ogram.
The Dewatoring Summary Report was comploto and very satinfactory and - aticflos upocial Conditionc 30, 31, and 32 of the tiPDES Pormit.
Wo will be making routine inspections of the Cooling Pond in tho futuro as with other pa mittod dicchargon. Lot uq know if thora are any concerns or quantions regarding this facility for which wo may accint your ctaff.
Sincoroly, Terry L. Walkington, P.E.
( Saginaw District Supervicor Surface Wator Quality Divicion 317/.771-1711 2LU:slu cc: P, Bradley Latvaitus, C.P.C., Jackson K. Zollnor, Jr., C.1D l
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