ML20063E530
| ML20063E530 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 02/01/1994 |
| From: | Warembourg D PUBLIC SERVICE CO. OF COLORADO |
| To: | Joseph Austin NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| P-94013, NUDOCS 9402100079 | |
| Download: ML20063E530 (14) | |
Text
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hPublic Service'
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1 16805 WCR 191/2; Platteville, Colorado 80651 Ii n7c5 moi-ouo.
February 1,1994 l
Fort St. Vrain i
P-94013
-l U. S. Nuclear Regulatory Commission j
ATTN: Document Control Desk l
Washington, D. C. 20555 Attention:
Mr. John H. Austin, Chief Decommissioning and Regulatory Issues Branch Docket No. 50-267 j
i
SUBJECT:
NPDES Permit Amendment 7
Dear. Mr. Austin:
Attached for your information is a copy of an amendment to the Fort St._Vrain (FSV)
National Pollutant Discharge Elimination System (NPDES) Permit, and a subsequent-l correction to this amendment. This amendment increased the pH limit for the farm pond outlet and added a requirement for a one-year study of factors that influence pH in the farm pond, so that appropriate pH limits can ultimately be established. This amendment j
is effective as of February 1,1994.
j The attached change to the FSV NPDES Permit is provided in accordance with Section 3.2.c of the FSV Non-Radiological Technical Specifications, Appendix B to. Facility Operating License No. DPR-34. If you have any questions regarding this information, i
please contact Mr. M. H. Holmes at (303) 620-1701.
Sincerely, yg/f abu Don W. Warembourg i Decommissioning Program Director i Attachments i ec: ' Regional Administrator, Region IV l .) 9402100079.940201 'I I i .R ADDCK 05000267 !s PDR jj g
% f T STATE O?COLO3A30 COLORADO DEPARTMENT OF HEALTH Dedicated to protecting and linproving the heakh and - environtnent of the people of Colorado l l 4300 Cherry Creek Dr.s. Laboratory Building l Derwer, Colorado 802221s30 4210 L 11th Avenue Phone 003) 692 2000 Denver, Colorado 80220-3716 o 03) 691-4700 t namer Dzcember 3, 1994 Louise Meyerkord, Unit Manager -Public Service Company of Colorado P.O. Box 840 i Denver, C0 80201 CER1witu MAIL NO: P 846 812 493 RE: Amended Permit, Colorado Wastewater Discharge Permit System Number: CO- 0001121 - PUBLIC SERVICE COMPANY OF COLORADO - FORT ST. VRAIN STATION Gentlemen: Enclosed please find a copy of the amended pages of your evicting permit which was issued under the. Colorado Water Quality Control Act. Your discharge permit requires that specific actions be performed at designated times. You are legally obligated to comply with all terms and conditions of your permit-including these changes. It is especially important to note the " EFFECTIVE DATE", not the ' AMENDED DATE", located at the bottom of each amended page of your permit. It is illegal to discharge per the new conditions until the effective date. Please read the amended pages of the permit and if you have any questions contact this of5ce at 692-3590. Sincerely, fiff A Robert A iukle, Chief Permits and Enforcement Section Water Quality Control Division cc: Permits Section, Environmental Protection Agency Regional Council of Government Local County Health Department District Engineer, Field Support Section, WQCD Derald Lang, Field Support Section, WQCD Enforcement Officer, Permits and Enforcement Section, WQCD Permit Drafters, Permits and Enforcement Section, WQCD RIS/lg .j Enclosure 1 o
.O-COLORADO DISCHARGE PERMIT SYSTEM (CDPS) i AMENDMENT NO. 2 - RATIONALE PUBLIC SERVICE COMPANY OF COLORADO FORTST. VRAIN STATION PERMITNO. CO-0001121, WEL.D COUNTY 1. TYPE OF PERMIT: Industrial-Amendment i 11. FACILITY INFORMATION: A. Facility Type Category 8, Subcategory 4 - Power Plants: Process Waterfrom 1.0 to and Fee Category: 4.999 MGD - Grrentfee $4568 per yearfor the process related permit; and Category 24, Subcategory 2 -IndividualIndustrial Storm Water Penmts* Ten Acres or More - Grrentfee $300/yearper CRS 25-8-502. Totalfee = $4868/ year. B. SIC No.: 4911 (Electric Senices) C. Legal
Contact:
Louise Meyerkord, Unit Manager, Environmental Programs, Public Service Company of Colorado P.O. Box 840 (122517th Street, Suite 2000) I Denver, CO 80201 (303)+294-2814 D. Factlity Contacts: Louise Meyerkord, Unit Manager, Environmental Programs (See abovefor address andphone number) Don Warembourg, Deco.wnissioning Program Director PSC Fort St. Vrain Station (303)+620-1009 E. Facility Location: The Public Senice Company Fon Saint Vrain Station & located approximately 3.5 miles northwest of Platteville, Colorado in Section 3, T3N, R67W: and Section.s 34 and 33, T4N, R67W: 6th Principal Meridian, as shown infigure 1 and 2 of the permit. F. Discharge Points: See renewal rationalefor thisfacilityfor description of all the outfalls (discharge points 001A, 001B, 002, 003, 004, 005, 006, 007, and monitoring point 008) at thisfacility. Outfall 001A - the outfall 001 overflowfrom thefarm pond at the Parshallflum, which is prior to entering the South Platte River, as shown infigure 3 of the remis. G. Facility Flows: Thefollowingflossfor 001A are unchangedfrom the previous rationale. 001A 2.065 MGD (averagefacilityflow) =
- 3. 7 MGD (maxunumflow)
= See presious renewal rationalefor the other dischargeflows. 9
COLOR 4DO DEPAR7 MENT OF HEAL 7H, Water Quality Control Divnion Rationale, Amendment No. 2 - Pop 2 Permit No. CO-0001121 IX. RECEIVING STREAM: Ou{faus 001A and 003 go to the South Platte River (segment 1, Middle South Platte River subbatin): 001B is located in the Goosequiu Ditch Stub, which then goes to Goosequiu Ditch, which is tributary to the South Platte River (Goosequill Ditch is in segment 3, Middle South Plane River subbasin); and outfalls 002, 004, and 005 go to St. Vrain Creek (segment 3, St. Vrain Creek subbasin). Outfans 006 and 007 are internal discharge points which does not discharge directly to any surface ucters. These tuo internal oufalls eventuauy contribute to discharges at 001A, 001B, and/or 002. See the previous reneual rationale (February 8,1993)forfunher details. IV. PURPOSE OF AMENDMENT: This amendment is to modify the limitsfor pHfor discharge point 001A, and to include a compliance schedulefor the pH limits at outfaU 001A with a required one-year study to determine thefactors influencing pH in thefann pond, to assess the seasonal nature of the inpuencing factors, and to ultimately assess what pH limitations are appropriatefor discharge point 001A. V. DISCUSSION OF AMENDMENT: In a lener dated April 21,1993, Public Service Company of Colorado (PSC) requested that the Division include a compliance schedulefor the pH lindts at outfan 001A in the PSC Fon St. Vrain discharge permit that includes a one-year study to determine thefactors influencing pH in thefarm pond and to assess the seasonal nature of the inpuencingfactors. In the letter, PSC also requested that the current pH limitation range of 6.5 to 9.0 s.u. at the outfall 001A from thefarm pond be suspended during the duratiim of the one-year study, and that the study be utilized to assess the needforfuture pH limitations at this outfall. 1hefollowing information indicated in the paragraphs below was included in the tener submitted by Public Sen' ice Company: On February 25,1993, thepnal wastesater discharge permitfor the Public Service Company of Colorado - (PSC) Fort St. Vrain Station (FSV) was receivedfrom the Colorado Water Quality ControlDivision (CWQCD). This permit became efective on April 1,1993. Page ic of the permit depnes the discharge lurutanonsfor outfan 001A to the South Platte Riverfrom the farm pond and includes limiting the pH to the range of 6.5 to 9.0 standard units (s.u.). At 9:30 am on l April 6,1993, the pH ucs measured at this outfaU and determined to be 10.0 s.u., despite thefact that the pH of she influent unter pH to thefarm pond was measured at 8.8 s.u. Investigations of this situation indicated that the increase in pH occurred in the pond itself and may be related to biological activity in the pond, panicularly algal inpuences. i Verbal notification was made to the Division at 9:00 am on April 6,1993 regarding this incident. In j discussions with the Division, the Division had indicated that it is not unusualfor algar to inpuence pH in 1 the manner seen in thefarm pond. At that time, the Dishion also suggested that a requestfor initiating a compliance schedule to assess thefactors influencing the pH in thefarm pond be submitted as an amendment request to the Dishion. Therefore, PSCproposed that a corrpliance schedule be initiated to determine thefactors inpuencing pH in thefarm pond and to assess the seasonal nature of the inpuencingfactors, as they appear to be biological in nature. This study will extendfor a one-year period to be initiated as soon as approvalfor the study is receivedfrom the CWQCD. Thefollowing analysis will be conducted throughout the study period, as is indicated on thefollowing page.
COLORADO DEPARTMENTOFHEALTH, Water Quality ControlDivision
- Rationale, Amendment No. 2 - Page 3 Pennis No. CO-0CC1121 V.
DISCUSSION OF AMENDMENT: (Continued) 1) pH to be measured weeUy at the Goosequill Ditch prior to thefarm pond, at the inlet to and the outletfrom the pond, at the center of the pond on the surface of the sater, and near the bonom at the deepest point in the pond. 2) Total biomass and chlorophyll content to be measured weeMy at the inlet to and the outletfrom the pond, at the center of the pond on the surface of the sater, and near the bonom at the deepest point in the pond. 3) Ammonia to be measured weeHy at the in!n to and the outletfrom the pond, at the center of the pond on the surface of the sater, and near the bottom at the deepest point in the pond. 4) Soil sampling and analysis to be measured monthly at thefour locations surrounding the pond to include pH, ammonia, andphosphase. As stated by PSC, it is recognized that, during the winter months, access to the center of the pond may be - limited byfreeting conditions, and therefore weeHy sampling may not bepossible. PSCproposed that the results of this study be submined to the CWQCD on a quanctly basis: that is, a report of the previous three months analytical results will be submitted by the end of thefo!!onkg month. PSC requested that the current pH limitation of 6.5 to 9.0 s.u. at the 001A outfa!!from thefarm pond be l suspended during the duration of the study, and that the study be utilized to assess the needforfuture pH limitations at this outfall, initial DMslon Approwl of Proposed PSC Study: Based upon an initial review of the information in this amendment request letter, the Division gave verbal approval to PSCto initiate this one-year study as proposed to enluate pH. This verbal appron! also included conditions that the study avuld be commencing efective June 1, 1993, and a summary of the results and conclusions of this study sould be submitted to the DMskm on a quarterly-basis. First Ouarterly Renon and
Conclusions:
Recently, thejirst quarterly repon of this study uns submined by PSC with an attached cover letter dated September 15,1993. For the weekly data in the study, the range ofpH values at outfa!! 001A discharge outlet have been respectively asfollowsfrom 4-161993 through 8-41993: 10.26, - 10.10, 9.90, 9.80,10.20,10.60,10.40,10. 60,10.00, 9.80, 9.80, 9.90, 9.50, 9.80, 9.60, and 9.20 s.u. During this study periodfor thejirst quarter, the range ofpH values occurringfrom the 001B outfa!! (8.60 - 9.00 s.u.) to the inlet to thefarm pond (1.60 - 8. 70 s.u.) have been within the 6.5-9.0 s.u. pH lbnits: however, the range ofpH salues occurring in thefarm pond (8.40 - 10.80 s.u., with most values in the range > 9.5 - >10.0) have been above the existing pH limitsfor outfall 001A. Some of the conclusionsfrom thefirst quanerly reportfor the pH study are asfollows: "At this point in time, it is. very hard to make anyfinn conclusions based on the data currently tabulated. Ihere may be a slight correlation between the pH and the chlorophyll / biomass levels, since these tuo graphs seem tofollow the same basic panern of a high point in June and a gradual decrease since then. It is also dtjicult to make conclusions since there are so many other contributingfactors Afecting the unter quality, out of our control. These include massive sater usage out of the Goosequilt ditchfor irrigation, greatly wrying noterflowsfrom the Jay Thomas ditch, and greatly surykg unter levels in the pond itselffrom week to week. "
9 COLORADO DEPARDfENTOFHEAL'IH, Water Quality ControlDMslon Rationale, Amendment No. 2 - Page 4 Permit No. CO-0001121 V. DISCUSSION OF AMENDMENT: (Continued) First Ouanerly Recon and
Conclusions:
(Cont.) Otherfndingsfrom theprst quanerly study were that weather conditions on those days ofsampling were extremely constant with mostly hot or ucrm, sunny days. Precipitation uns never encountered, and only afew i days ofcloudy skies were observed. It uns rather surprising with this amount ofsunshineshat the algae growth uns not greater than uns observed. Possibly, unterpousfrom the ditches into thefarm pond and/or other i unknownfactors may have afected the amount of algae groush there. ^ i Wildhfe were also observed in and around the pond regularly. According to the quanerly study conclusion, 'this i uculd seem to be a mqforfactor in the assenion that the high pH is a natural occurrence, an has no detrimental efects to these creatures.
- Various birds (geese, ducks, connorants, pelicans, herons, cranes, blackbirds, i
swallous, grebes) were observed in or around the pond. Several species were observed in the nesting stage, with many producing a new generation. Several other species of animals (including turtles, snakes, frogs, muskrats, deer, and wild turkeys) were also observed. 1he carp and otherpsh seem to be doing well as evidenced by the massive spawning occurring in the lake in June and July. Recently, huge populations of minnows or young carp i were obse-ved all along the shores. nus, all of the observed wildhfe seems to indicate this pond is a vital and heahhy pan of the local ecosystem. Division Resoonse to Public Service Comoans of Colorado (PSCI Amendment Reovest: De Division has revi the amendment request submitted by PSC, and has determined that interim limitationsfor pH along with a compliance schedulefor oufall 001A are appropriate to include in this permit as an amendment. Previously before the recently reissued renesolpermitfor thisfacility, there were no pH limits or monitoring requirementsfor i oufall 001A. Based upon the pH salues which have occurred at outfall 001A and in thefarm pond as well as the other described conditions of the pond, the DMsion has determined that an interim pH limitation range of 6.5 to l 11.0 s.u. wi!! be establishedfor 001Afor the period through September 30,1994. Since a maximum pH salue of. 10.8 s.u. has beenfound in thefarm pond, the maximum interim pH limit of11.0 s.u. will be applicable. Beginning on October 1,1994, the pH limitation range will revert back to 6.5-9.0 s.u. However, thesepnalpH limitations will befunher reevaluated and modified, based upon the analytical results of the one-year study and other possible considerations, after the study has been submitted as pan of the compliance schedulefor oufall 00]A. Page Ic of the permit has been accordingly revised in this amendmentfor the interim pH limitsfor outfall 001A, and page 1c(i) has been addedfor thefinalpH limitsfor outfall 001A. Page lh(i) has also been added to include a compliance schedulefor the pH limits at outfall 001A. De study is required to be submined as part of the compliance schedule. As required in the compliance schedule, the permittee shall submit to the Water Quality ControlDivision by August 31,1994, an implementation planfor achieving compliance. Forfunher details and requirements of the compliance schedule, refer to Pan 1.A. 7, page lh(i) of the permit. Since this amendment includes a sigmficant change, public notice requirements are applicable. Additional Chemicals Used at the PSC Fort St. Vrain Facility: In leners dated August 31,1993 and Septeml>er 23, 1993 submitted by PSC to the Division, the use of additional chemicals at the PSC Fort St. Vrain Facility uns indicated. nese chemicals include Calgon Pol E-Z 2706 (emulsion polymer containing ammonium chloride), Calgon Cat-Floc IL (an aqueous solution ofcationic polymer), and Calgon Coagulant Aid 35 (bentonite clay), which might be usedfor treatment of waterfrom the Prestressed Concrete Reactor Vessel (PSCV). The use of these chemicals were verbally approved by the Division previously on August 21,1993 and September 22,1993. Forfurther details of these chemicals, see the letters dated August 31,1993 and September 23,1993. Don Holmer September 29,1993
i COLORADO DEPARDfENT OFHEALTH, Water Quality ControlDisiston . Rasionale, Amendment No. 2 - Pege 5 Permit No. CO-0001121 l l VI. CHANGES TO RATIONALE AND PERMIT FOLLOWING PUBLIC NOTICE: One comment letter dated November 22,1993 was receivedfrom the permittee regarding this amendment. In the comment lenerfrom Pub!!c Service Company of Colorado, PSCin part indicated thefollowing: 'It is PSC's understanding that one of the purposes of the study is to determine the appropriate pH limitationsfor the outfa!!from thefann pond. If the pH range will automatically reven back to 6.5 to 9.0 s.u. aper the study, this purpose of the study has been invalidated. ' 'It is relenmt that the existingfarm pond ecosystem has been stablefor numerous years and that plans to alter the ecosystem beginning October 1,1994 to ani$ cia!!y produce ejluentfrom thefarm pond within the pH range of 6.5 to 9.0 s.u. will cause unnecessary stresses on the naturally-occurring lifeforms that utilize thefarm pond and the streamfrom the pond to the South Plane River. It is PSC's belief that adding chemical treatment at the efluentfrom thefann pond to lower the pH during warm months or to thefann pond to ' kill" algae in the pond are not in the best interests of the ecosystem and seem contrary to minimizing chemical impacts in the environment. " At this time, the Division does not intend to require the addition ofchemicalsfor lowering the pH orfor controlling algae in the pond. IhefmalpH limitsfor 001A will befunher reevaluated and modifed, aper the one-year study has been submitted and reviewed. The pH limitationsfor outfall 001A are especially relevant to reevaluate, since this discharge point had no pH limits in efectfor the presious renenalpermit. However, at this time the Division has determined thatfinal pH limits of 6.5 to 9.0 s.u. should still be includedfor 001A efective October 1,1994, with the addition of a quahfyingfootr,ote. Thus, based upon this comment lener, some changes were made to the rationale and pennit. 1he change made in the pennit was that on page ic(i), afootnote uns addedfor thepnalpH limitationsfor outfall 001A which states that thepnalpH limitations well befunher reevaluated and modifed, based upon the analytical results of the one-year study and otherpossible considerations. A comparable change in the discussion of thepnalpH limits was indicated on page 4 of the rationale. Beginning on October 1,1994, ifpH levels should be above 9.0 s.u., the Disision will use enforcement discretion until thepnalpH limits have been reevaluated and modi $ed, based upon the analytical results of the one-year study and other possible considerations, aper the study has been submitted as part of the compliance schedulefor outfall 001A. Don Holmer December 1,1993
p 5 + serait No.: CO-0001121 County: Weld r AUTHORIZATION TO DISCHARGE UNDER THE COLORADO DISCHARGE PERMIT SYSTEM i In compliance with the provisions of the Colorado Water Qual; er^1 Act, (25-8-101 et. seq., CRS, 1973 as amended) and the Federal Wa e;cn Control Act, as amended (33 U.S.C. 1251 et. seq.; the "Act"). PUBLIC SERVICE COMPANY OF COIDRADO is authorized to discharge from the Fort St. Vrain Station, located in Section 3, T3N, R67W; and Sections 34 and 35. T4N, R67W; 6th Principal Meridian, as shown in figure 1, j to the South Platte River, St. Vrain Creek, and natural and man-made tributaries of these two streams, i in accordance with effluent limitations, monitoring requirements and other conditions set forth in Part I, and II hereof. All discharges authorized herein shall be consistent with the terms and conditions of this permit. The applicant may demand an adjudicatory hearing within thirty (30) days of the issuance of the final permit determination, per Regulation for the State Discharge Permit System 6.8.0 (1). Should the applicant choose to contest any of the effluent limitations, monitoring requirements or other conditions contained herein, the applicant must comply with Section 24-4-104 CRS 1973 and the Regulation for the State Discharge Permit System. Failure to contest any such effluent limitation, monitoring requirement, or other condition, constitutes consent to.the condition by the Applicant. This permit and the authorization to discharge shall expire at midnight, January 31, 1998. Issued and Signed this 19t hday of Fe brua ry, 1993 CERTIRED Lu(tu WM@W82 COLORADO DEPARTMENT OF HEALTH DATE SIGNED M, zd93 ' hf b$ 5 hk k W / J. David Holm, Director Water Quality Control Divisi Amended 06/30/93 Effective 08/01/93 Amended !?/n1/ot Effective n.,,n Code: 1-1 Date: 2 - 84, revised 1-89 I
PART~I Page Ic of 19 Permit No. CO 0001121 A. TERMS AND CONDITIONS -5. a. Effluent Limitations. - Outfall 001A (to the South Platte River) Beginning immediately and lasting through September 30, 1994, the permittee is authorized to discharge from outfall.001A, the overflow from the farm pond at the Parshall flume, which is prior to entering the South Platte River, as shown in figure 2. In accordance with the Water Quality Control Commission Regulations for f Effluent Limitations, Section 10.1.3, and State Discharge Permit System Regulations, Section 6.9.2, 5 C.C.R. 1002-2, the permitted discharge shall not contain effluent parameter concentrations which exceed the following limitations, discharge more than the mass pollutant loadings i specified below, or exceed the specified flow limitation. Effluent Parameter Discharpe Limitations 30-Day Ave g/ 7-Day Avg h/ Daily Max g/ Flow, MCD Report N/A Report Temperature, degrees F Report N/A 86 Total Residual Chlorine, ag/l
- 0.25 N/A 0.25 pH - standard units shall remain between 6.5 and 11.0 g/.
Oil and Grease shall not exceed 10 mg/l g/ nor shall there be a visual sheen, see footnote f/. There shall be no discharge of floating solids. See also Part I.A.l.(b) on page la. See Part I.C. for Footnotes. Amended ___ t ? /n1/ 01 Effective 02/01/94 Code: 1 - 2c Date: 1-84; revised 12 87, revised 12-88
e PART I Page'1c(i) of 19 Permit No. CO-0001121 A. TERMS AND CONDITIONS 5. b. Effluent Limitations - Outfall 001A (to the South Platte River) 5 Beginning October 1, 1994 and lasting through January 31, 1998,_the permittee is authorized to discharge from outfall 00lA. th'e~ overflow from the farm pond at the Parshall flume, which is prior to entering the South Platte River, as shown in figure 2. In accordance with the Water Quality Control Commission Regulations for Effluent Limitations, Section 10.1.3, and State Discharge Permit System Regulations, Section 6.9.2, 5 C.C.R. 1002-2, the permitted discharge shall not contain effluent parameter concentrations which exceed the following limitations, discharge more than the mass pollutant loadings specified below, or exceed the specified flow limitation. Effluent Parameter Discharre Limitations 30-Day Avr A/ 7-Dav Avg h/ Daily Max g/ Flow, MCD Report N/A Report Temperature, degrees F Report N/A 86 Total Residual Chlorine, ag/l
- 0.25 N/A 0.25 pH - standard units shall remain between 6.5 and 9.0 g/ **.
Oil and Grease shall not exceed 10 mg/l s/ nor shall there be a visual sheen, see footnote f/. There shall be no discharge of floating solids. See also Part I.A.l.(b) on page la. These pH limitations will be further reevaluated and modified, based upon the analytical results of the one-year study and other possible considerations. See Part I.C. for Footnotes. Amended 12/03/93 Effective 02/01/94 I Code: i - 2c(i) Date: 1-84, revised 12-87, revised 12-88 f
PART I Paga lh(i) cf 19 ) Permit Ns. CO-0001121 A. TERMS AND CONDITIONS 7. Comoliance Schedule < Outfall 001A (to the South Platte River) The permittee shall achieve compliance with the effluent limitations of Part I.A.5., effective October 1,1994, in accordance with a schedule of compliance approved by the Water Quality Control Division. The permittee shall submit to the Water Quality Control Division by August 31, 1994, an implementation plan for achieving compliance. As appropriate, the plan shall include the one-year study results and conclusions, any operational changes, modification of the existing treatment system, pretreatment, or construction of a new treatment system. A schedule of dates to accomplish various tasks related to the plan should also be included. The one-year study shall be performed to determine the factots influencing pH in the farm pond and to assess the seasonal nature of the influencing factors. This study will include at least a one year period of data evaluation, reported in quarterly reports, and will include the following analysis: 1) pH to be measured weekly at the Goosequill Ditch prior to the farm pond, at the inlet to and the outlet from the pond, at the center of the pond on the surface of the water, and near the bottom at the deepest point in the pond. 2) Total biomass and chlorophyll content to be measured weekly at the inlet to and the outlet from the pnnd, at the center of the pond on the surface of the water, and near the bottom at the deepest point in the pond. 3) Ammonia to be measured weekly at the inlet to and the outlet from the pond, at the center of the pond on the surface of the water, and near the bottom at the deepest point in the pond. 4) Soil sampling and analysis to be measured monthly at the four locations surrounding the pond to include pH, ammonia, and phosphate. Upon approval of the implementation plan by the Division, all terms and conditions of the implementation plan, including but not limited to the compliance schedulo, will automatically become conditions of this permit. No later than 14 calendar days following each date identified in the above schedule of compliance, the permittee shall submit either a report of progress or, in the case of specific actions being required by identified dates, a written notice of compliance or noncompliance, any remedial actions taken, and the probability of meeting the next scheduled requirement. A schedule for the elimination of the discharge, through connection to another treatment system or by other means, may be substituted for this schedule of upgrading. Amended t o rn, rom Effective n9rn, rot Code: 1 - 2h(i) Date: 1-84, revised 12-87, revised 12-88
- j q
Sygo;:CO 03A30 1 ~. COLORADO DEPARTMENT OF HEALTH Deducated to protecting and improving the health and environment of the people of Colorado l 1 -4300 Cherry Creek Dr. 5. Laboratory Building i Denver, Colorado 802221530 4210 E.11th Avenue Phone 003) 692-2000 Denver, Colorado 60220 3716 0 03)691-4700 Roy Rorner cm .r December 23, 1993 rauw u wa.n,so urn i ne oir nor i Louise Meyerkord, Manager Public Service Company P.O. Box 840 Denver, CO 80201-0840 i RE: Correction for Permit l Public Service Company-Ft. St. Vrain Permit Number: CO-0001121 Weld County
Dear Ms. Meyerkord:
Page 3 of the rationale and page lh(i) of 19 for the :above-j referenced permit have been corrected. i Please place the enclosed pages in your permit and discard the original pages. If you have any questions regarding this matter, please call me at (303) 692-3597. i Sincerely, .i i Louann Gaines, Staff Assistant WATER QUALITY CONTROL DIVISION Permits and Enforcement-Section ces Permits Section, Environmental Protection Agency l Local County Health Department District' Engineer, Field Support Section, WQCD Derald Lang, Field Support Section, WQCD Connie Moreno, Administration, WQCD Enforcement Officer, Permits and Enforcement Section, WQCD enclosure ~f t Received j Environmental rvic. PM k_ ] /
COLORADO DEPARTMENTOFHEALTH, Water Quality ControlDivision i Rationale, Amendment No. 2 - Pcge 3 Permit No. CO-0001121 V. " DISCUSSION OF AMENDMENT! (Continued) 1) pH to be measured weekly at the Goosequill Ditch prior to thefarm pond, at the inlet to and the outletfrom the pond, at the center of the pond on the surface of the unter and near the bottom s at the deepest point in the pond. 2) Total biomass and chlorophyll content to be measured weekly at the outletfrom the pond, at the center of the pond on the surface of the water, and near the bottom at the deepest point in the pond. 3) Ammonia to be measured weekly at the inlet to and the outletfrom the pond, at the center of the pond on the surface of the water, and near the bottom at the deepest point in the pond. 4) Soil sampling and analysis to be measured monthly at thefour locations surrounding the pond to. include pH, ammonia, and phosphate. As stated by PSC, it is recogni:ed that, during she winter months, access to the center of the pond may be limited byfreezing conditions, and therefore weekly sampling may not be possible. PSCproposed that the results of this study be submitted to the CWQCD on a quarterly basis; that is, a report of the previous three months analytical results will be submitted by the end of thefollowing month.' PSC. equested that the current pH limitation of 6.S to 9.0 s.u. at the 001A outfallfrom thefarm pond be suspended during the duration of the study, and that the study be utilized to assess the needforfuture pH Iimitations at this outfall. Initial Division Annrovalpf Proposed PSC Studv: Based upon an initial review of the information in this amendment request letter, t!ae Division gave verbal approval to PSC to initiate this one-year study as proposed to evaluate pH. This verbal approval also included conditions that the study would be commencing efective June 1, 1993, and a summary of the results and conclusions of this study would be submitted to the Division on a quarterly basis. First Ouarterly Report and
Conclusions:
Recently, thefrst quarterly report of this study was submitted by PSC. with an attached cover letter dated September 15, 1993. For the weekly data in the study, the range ofpH wiues l at outfall 001A discharge outlet have been respectively asfollousfrom 4-16-1993 through 8-4-1993: 10.26, 10.10, 9. 90. 9. 80,10. 20,10.60,10.40,10.60,10.00, 9.80, 9. 80, 9.90, 9.50, 9.80, 9. 60, and 9.20 s. u. ' During this study periodfor theprst quarter, the range ofpH values occurring from the 001B outfall (8.60 - 9.00 s.u.) to the inlet to thefarm pond (7.60 - 8. 70 s.u.) have been within the 6.5 9.0 s.u. pH limits: however, the range ofpH values occurring in thefarm pond (8.40 - 10.80 s.u., with most values in the range > 9.5 - > 10.0) have been above the existing pH limits for outfall 001A. Some of the conclusionsfrom theprst quarterly reportfor the pH study are asfollous: "At this point in time, it is. very hard to make anyprm conclusions based on the data currently tabulated. There may be a slight correlation between the pH and the chlorophylubiomass levels, since these two graphs seem tofollow the same basic pattern l of a high point in June and a gradual decrease since then. It is also dificult to make conclusions since there are so many other contributingfactors afecting the water quality, out of our control. These include massive unter usage out of the Goosequill ditchfor irrigation, greatly varying waterpowsfrom the Jay Thomas ditch, and greatly varying water levels in the pond itselffrom week to week. " \\ Corrected 12/23/93 l 2
PART 1 Pags lh(i) of 19 Paruit No. CO 0001121- ,A. ' TERMS AND CONDITIONS t 7. Come11ance Schedule i Outfall 001A (to the South Platte River) The permittee shall. achieve compliance with the effluent limitations'of s Part I,A.S., effective October 1, 1994, in accordance with p schedule of compliance approved by the Water Quality Control Division. The permittee shall submit to the Water Quality Control Division by August 31, 1994, an implementation plan for achieving compliance. As appropriate, the plan shall include the one-year study results and conclusions, any operational changes, modification of the existing treatment system, pretreatment, or construction of a new treatment system. A schedule of dates to accomplish various tasks related to the plan should also be included. s The one-year study shall be performed to determine the factors influencing pH in the farm pond and to assess the seasonal nature of the i influencing factors. This study will include at least a one year period of data evaluation, reported in quarterly reports, and will include the following analysis: 1) pH to be measured weekly at the Goosequill Ditch prior to the farm pond, at the inlet to and the outlet from the pond, at the center of the pond on the surface of the water, and near the bottom at the deepest point in the pond. 2) Total biomass and chlorophyll content to be measured weekly at the outlet from the pond, at the center of the pond on the surface.of the water, and near the bottom at the deepest point in the pond. i 3) Ammonia to be measured weekly at the inlet to and the outlet from the pond, at the center of the pond on the surface of:the water, and near the bottom at the deepest point in the pond. 4) Soil sampling and analysis to be measured monthly at the four locations surrounding the pond to include pH, ammonia, and phosphate. Upon approval of the implementation plan by the Division, all terms and conditions of the impicmentation plan, including but not limited to the 1 compliance schedule, will automatically become conditions of this permit. No later than 14 calendar days following each date identified in the above schedulo of compliance, the permittee shall submit either a report of progress or, in the case of specific actions being required by i identified dates, a written notice of compliance or noncompliance, any remedial actions taken, and the probability of meeting the next scheduled ) requirement. A schedule for the elimination of the discharge, through connection to another treatment system or by other means, may be substituted for this schedule of upgrading. ] I Amended 12/03/93 Effective 02/01/94 Corrected 12/23/93 Code: i 2h(1) Date: 1-84, revised 12 87, revised 12-88 .}}