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HomeMy WebLinkAboutWQCS00002_NOV-2021-DV-0054 Response_20210216a 14110 0; 0/ Raleigh Water February 16th, 2020 Mr. Scott Vinson Regional Supervisor Water Quality Regional Operations Section Raleigh Regional Office Division of Water Resources NCDEQ 1628 Mail Service Center Raleigh, NC 27699-1628 Re: Response to NOV-2021-DV-0054 Sanitary Sewer Overflows — December 2020 Permit No. WQCS00002 Dear Mr. Vinson: FEB 1 6 2021 NC DENR Raleigh Regional Offim Please allow this letter to serve as a response to the Notice of Violation & Intent to Issue Civil Penalty document (NOV-2020-DV-0054) received on February 2nd, 2021. This document contains narratives regarding pending violation actions of (3) Sanitary Sewer Overflows (SSO) events, which occurred in month of December 2020 within the City of Raleigh Collections System (1J. The noticed events occurred while the City operated its collection system, according to WQC500002, dated June 6th, 2017. The permit includes the language outlined in footnote 1 and applies to the SSOs upon which NOVs with the notice of intent (NOV-NOI) were based. This document will establish a reasonable explanation of the actions taken to stop the spill; contain the released wastewater; collect the wastewater and reintroducing it to the collection system; and finally, restoring the possible environmental impacts brought by the release of the S50 events, listed with the intended NOV-NOI action. Please find below, the additional information requested for each of the SSO events. 1. "The Director may take enforcement action against the Permittee for 550s that must be reported to the Division as stipulated In Condition IV92). This Includes SSOs that were caused by severe natural conditions or exceptional events unless the Permittee demonstrates through properly signed, contemporaneous operating logs, or other relevant evidence that: Ia.J The 550 was caused by severe natural conditlor s; there were no feasible alternatives to the 550, such as the use of auxiliary treatment facilities, retention of untreated wastewater, reduction of Inflow and Infiltration, usv of adequate back-up equipment, or an ;ncrease in the capacity of the system. This provision Is not satisfied if, in the exercise of reasonable engineering Judgment, the Permittee should have Installed auxiliary or additional collections system components, wastewater retention or treatment facilities, adequate back-up equipment or should have reduced infow and infiltration; or 113.1 The SSO was exceptional, unintentional, temporary and caused by factors beyond the reasonable control of the Permittee; the SSO could not have been prevented by the exercise of reasonable control, such as proper management, operation, and maintenance; adequate treatment or collection facilities or components (e.g., adequately enlarging treatment of collection fa€'lines to accommodate growth or adequately controlling and preventing infiltration and inflow); preventative maintenance; or installation of adequate ba€k•up equipment;" 111, # „tn Incident Number # 202003448 —12/19/2020 — 9299 Glenwood Ave., Raleigh, NC (Sycamore Creek Pump Station 36) This spill was neither willful nor intentional; it was the result of a circuit breaker malfunction causing electrical conflict between the Programmable Logic Control (PLC) system [1] and the Radio Telemetry Unit (RTU) [2] of Sycamore Creek Pump Station # 36. The malfunction affected wastewater flow from a 30-inch Polyvinylchloride (PVC) gravity sewer main. This event resulted in approximately 58,544 gallons of untreated wastewater to spill into an unnamed tributary of Sycamore Basin. On 12/09/2020, at approximately 6:28 AM, Raleigh Water staff discovered that the wastewater flow within the facility's wet -well was above the normal level. Operators immediately started to actuate the pumps to bring the wastewater levels down manually; however, the pumps would only work momentarily due to the electrical control system that actuates the pumps were submerged under wastewater. As an immediate corrective action, Utility Contractors were summoned to initiate a sewer by-pass. As part of the spill containment measures, several large -capacity pumps were deployed and strategically placed to control the facility's wastewater flow. The containment measure ensured that the wastewater remained within the facility's wet and dry well. This initiative ensured that approximately 140,753 gallons of wastewater remained in the facility's wells. At approximately 2:04 PM, the containment measures were unable to keep up with the demand of sewer flow resulting in the subsequent spill of roughly 58,544 gallons of untreated wastewater. At approximately 7:40 PM, the temporary by-pass was installed and activated, restoring sewer flow and stopping the spill. Containment and collection of this spill event consisted of placing a temporary containment dam downstream of the station. This emplacement contained filtering media to stop wastewater debris from flowing downstream. A 4-inch pump was placed in the containment darn to collect and transfer the wastewater from the stream and reintroduce it into the collection system. With the capacity to store 6,000 gallons of liquid, two tankers trucks were utilized to removed roughly 48,000 gallons of wastewater from the facility. This combined containment and collection effort was successful in the transfer of wastewater elsewhere in the collection system. Restoration of this spill event consisted of washing the land surrounding the station. Crews utilized ample potable water to flush the affected area. Sewer debris and solids were collected and disposed of accordingly. This spill was contained without a significant environmental impact to the adjacent area and its natural resources. Visual inspection of the affected area and downstream waters confirmed that no fish kill or unnecessary vegetative damage occurred. A subsequent investigation of these events revealed that a circuit breaker had malfunction causing the Programmable Logic Control system (PLC) to fail to actuate alternate pumps within the station's dry well. The circuit breaker malfunction also triggered the Radio Telemetry Unit (RTU) to transition into alternate battery power resulting in a failed telemetry alarm. The unintentional electronic malfunction caused the primary, secondary and tertiary wastewater pumps to stop. When these pumps stopped, wastewater levels increased and Page 2 of 9 flowed from the wet well into the dry well through a conduit aperture on the wall that separates both wells. The wastewater -flow subsequently submerged the pumps and their electrical controls, resulting in a systemic malfunction. The cost associated with the mitigation of this event has amounted to over $230,000. The approximate cost to the Utility to have treated 58,544 gallons of wastewater would have been approximately $87.81. The City saved no money from this spill. Its costs for cleanup exceeded the cost of treating the volume of sewage had no spill occurred. Furthermore, the City still had to pay the cost to treat the greater volume of sewage created by the spill. This pump station transfers approximately 1.0 MGD South of Glenwood Avenue, providing sewer collection services to residential and commercial establishments within Turkey and the Sycamore Basin. There has been no history of sewer spills associated with this section of the sanitary sewer collection system. Before this event, maintenance records show that this station was last serviced and inspected on 12/01/2020 There have been no additional issues associated with this section of the collection system since the last sewer event. This site remains an active maintenance spot until all electric upgrades have been installed ad test for efficiency. The sewer by-pass connection used to temporarily control the wastewater flow remained a permanent backup system of the station. The station continues to be upgraded to ensure no other malfunctions occur. As the result of this event, the Utility conducted a systematic assessment of 8 other pump stations identifying them as possible sites requiring electronic system updates. A press release notification associated with this event was requested to be published in the Raleigh News & Observer on December 10th, 2020. [11 A Programmable Logic Controller or PLC, is a ruggedized computer used for industrial automation. These controllers can automate a specific process, machine function, or even an entire production line. in wastewater, operations Is often used to control alternating pump functions within a sewer network structure such as a pump station. [21 A Radio Telemetry Unit, or RTU, is a point-to-point direct communications system used to alert the system's controller of the status of a remotely located peripheral device such as a pump in a remote pump station. The system Is designed as an early warning device to alert operators of possible remote system issues. 179nn2nS0 Incident Number # 202003538 —12/23/2020 — 3120 Walnut Creek Parkway, Raleigh, NC This spill was neither willful nor intentional; it resulted from debris (see Exhibit #1 below) partially blocking a portion of an 8-inch ductile iron gravity sewer main. The blockage led to a sewer spill of approximately 39,000 gallons of untreated wastewater reaching an unnamed tributary's surface waters in Walnut Basin. On 12/26/2020, at approximately 11:55 AM, a Sewer Maintenance staff conducting a site inspection identified a manhole spilling over. The operator immediately summoned Utility Responders to the site of the spill. The responding staff took all reasonable steps to stop and mitigate the impact of the discharge as soon as they arrived, gaining control of the spill event by 2:05 PM on the same day. Crews utilized hydraulic jetting to remove the source of the blockage within the affecting asset, thus restoring sewer flow Containment and collection of this spill event consisted of employing two temporary spill containment sites downstream of the affected area. This approach is intended to contain sewer flow and minimize the environmental impact on the surrounding land. Responding crews initiated the collection of untreated wastewater from both containment sites to re -introduced it to the collection system downstream. This spill was contained without a significant environmental impact to the adjacent area and its natural resources. Visual inspection of the affected area and downstream waters confirmed no fish kill or unnecessary vegetative damage occurred. During the restoration phase of the operation, crews utilized ample potable water to remove any sewer evidence downstream of the affected area. The area around the manhole was cleared of debris, treated with an application of lime, and restored with grass seed and straw. The cost associated with the mitigation of this event amounted to $27,138.93. The approximate cost to the Utility to have treated 39,000 gallons of wastewater would have been approximately $58.50. The City saved no money from this spill. The costs for cleanup exceeded the cost of treating the volume of sewage had no spill occurred. Furthermore, the City still had to pay the cost to treat the greater volume of sewage created by the spill. A follow-up investigation of this event determined that this spill event may have been attributed to a previous rehabilitation project upstream of the affected asset. This project resulted from a prior sewer spill on May 7th, 2020 (Incident Number 202001341). This spill was caused by pipe corrosion and tuberculation. As a result of this project, approximately 1,170 ft. of sewer gravity main (traversing under 1-40 was assessed for tuberculation and lined with PVC. As a result of the sewer spill event on December 23rd, Raleigh Water increased the sewer maintenance effort of approximately 3,261 ft of gravity sewer main. Maintenance of this section of the collection system consisted of hydraulic flushing, mechanical hydro -cutting, vacuum & removal of debris, and CCTV verification. Since January 5th, 2021, crews have completed maintenance of approximately 1,684 ft of sewer main. Maintenance and CCTV verification are still ongoing. This section of the collection system serves a commercial and residential area south of 40 and West of Gorman St. It provides sewer collection services to several multi -dwelling properties and various commercial establishments. The last recorded sewer spill associated with this asset occurred on 5/07/2020. A press release notification of the December 23rd event was requested to be published in the Raleigh News & Observer on 12/23/2020 (see Exhibit #2 below). Page 4 of 9 Exhibit # 1- Debris found in the main not consistent with regular wastewater debris such a paper #'s-r-.7,i-by . .`)"i Exhibit # 2 - Not of Discharge and Press release December 23rd, 2020 Raleigh Water Responds to a Sanitary Sewer Overflow On Wednesday, December 23rd, 2020, at approximately 11:55 AM, Raleigh Water staff responded to a sanitary sewer overflow located at 3120 Walnut Creek Parkway, Raleigh, NC. The cause of the overflow was related to debris accumu- lation and heavy sediment, which dis- rupted the flow of an 8 -inch ductile iron pipe sewer gravity main. The respond- ing staff took all reasonable steps to stop and mitigate the overflow's impact as soon as they arrived. The North Caroli- na Department of Environmental Quali- ty, Division of Water Resources was no- tified of the overflow. Raleigh Water - Sewer Maintenance Di- vision staff stopped the overflow at ap- proximately 2:05 PM on the same day. It is estimated that the overflow dis- charged a volume of approximately 39,000 gallons of untreated wastewater, reaching an unnamed tributary of Wal- nut Basin. Restoration associated with this sewer event is ongoing. • Raleigh Water has an aggressive edu- cation and enforcement program to pre- vent the discharge of grease, debris, wipes, rags, diapers and other improper materials in the sewer system and to take enforcement action where appro- priate. If these items make it into the sewer system, they may cause a spill which can have an adverse impact on water quality and endanger those who come into contact with the affected areas. • Water, human waste, and toilet tissue are the only items permitted to be dis- charged into the sewer system. All other items will cause damage to the sewer system and are not permitted. • If you experience excessive sewer smells or see sewer spilling from man- holes or pipes, please call 919-996-3245 to report immediately. • For more information about how you can help prevent sanitary sewer spills, please visit: raleighnc.gov/water This news release is required by NCGS Article 21, Chapter 143.215.1C. N&O: December 25, 2020 RP=== 1+ -i is Incident Number # 202003591 — 12/30/2020 —105 Summershade Ct., Knightdale, NC This spill was neither willful nor intentional. It resulted from a grease build-up, restricting the sewer flow within a section of 8-inch polyvinyl chloride gravity sewer main. This build-up led to a sewer spill of approximately 780 gallons of untreated wastewater in which approximately 400 gallons reached an unnamed tributary within the Mingo Basin. On 12/30/2020, at approximately 10:20 AM, Sewer Maintenance staff was notified of a sewer spill emanating from a private residential cleanout located at 105 Summershade Ct., Knightdale. The responding staff arrived at approximately 11:00 AM and commenced taking all reasonable steps to stop and mitigate the impact of the discharge, gaining control of the spill event by 11:32 PM on the same clay. Crews utilized hydraulic jetting to remove the source of the blockage within the affecting asset, thus restoring sewer flow. Containment and collection of this spill event consisted of employing a temporary spill containment downstream of the affected area. This approach was intended to contain sewer flow and minimize the environmental impact on the surrounding land. Responding crews initiated the collection of untreated wastewater from the containment site and re -introduced it to the collection system downstream. This spill was contained without a significant environmental impact to the adjacent area and its natural resources. Visual inspection of the affected area and downstream waters confirmed that no fish kill, or unnecessary vegetative damage occurred. During the restoration phase of the operation, crews utilized ample potable water to flush the affected area and remove sewer traces from the area surrounding the manhole and the downstream stormwater system. Crews employed pumps at the temporary containment site to recover flushed wastewater and any evidence of sewer. The areas around the manhole were cleared of debris and washed with potable water. The area around the cleanout was cleared of debris, treated with an application of lime and restored with grass seed and straw. A follow CCTV assessment was conducted on 01/05/2021 to identify the root cause of grease accumulation. The CCTV assessment did not find any infrastructure issues that may have led to the grease accumulation. The cost associated with the mitigation of this event amounted to $4,298.46. The approximate cost to the Utility to have treated 780 gallons of wastewater would have been approximately $1.17. The City saved no money from this spill. Its costs for cleanup exceeded the cost of treating the volume of sewage had no spill occurred. Furthermore, the City still had to pay the cost to treat the greater volume of sewage created by the spill. This section of the collection system is located in a residential area. It provides sewer collection services to over 200 residents. There has been no history of sewer spills associated with this section of the sanitary sewer collection system. A press release notification associated with this event was not required since the event was below the 1000 gallons threshold. Outreach information literature was sent to approximately 205 residents within the immediate affected area on 01.07/2021. The outreach literature delivered explains the need for customers to use the sanitary sewer collection system properly. It also serves as an opportunity for citizens to partner with Public Utilities to protect the City's water quality and the sewer collection infrastructure (see Exhibit # 1 below). Page 6 of 9 Before this event, maintenance records show that sections of this collection system were assessed as follows: Flushing activities CCTV activities 03/27/2017 11/18/2015 03/28/2017 03/10/2017 12/31/2020 03/27/2017 01/1/2021 03/26/2019 03/28/2019 03/29/2019 There have been no additional issues associated with this section of the collection system since the last sewer event. This site continues to remain an active maintenance spot pending completion of investigation. 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S.. f.:..-.... ••.C.•.: Summary The Sewer Maintenance Division of Raleigh Water strives to develop initiatives that improve operational reliability to meet customer expectations and meet or exceed the Water Quality Collection System permit requirements. Our operations are focused on continual improvement, the prevention of pollution, and increased environmental performance efficiency. This endeavor is greatly noted as the Division operates an ISO Certified Environmental Management System governed by the 14001-2015 Standards. As part of these initiatives, the Division operates a comprehensive reactive and preventative maintenance program whose goal is to maintain over 2600 miles of sanitary sewer pipe and minimize the accidental release of untreated wastewater. Since July 1, 2020 (Fiscal Year 2021), the Utility has maintained approximately 258111 miles of gravity sewer mains by flushing with hydraulic jetting, conducting CCTV assessments, and performing repair operations, easement maintenance, and inspections. The fiscal year to date cost of these operations amounts to $2,360,241.57 [2[, approximately 13% of the Division's annual operating budget. The 98,324 gallons of untreated wastewater spills identified in this letter has cost the Utility approximately $261,437.39 to mitigate. The City's cost of sewer treatment per gallon is $.0015 [3(. At this rate, it would have cost the City $147.50 to treat the entire volume of sewer spilled. The City saved no money from these spills. The costs of mitigation well exceeded the cost of treating the volume of sewage had no spill occurred. Furthermore, the City still had to pay the cost to treat the greater sewage volume created by these spills. This fiscal comparison shows the City's commitment to environmental protection, sparing no cost regardless of the spill event's severity and complexity. The City continues to demonstrate due diligence in environmental performance by allocating the necessary resources to a spill event irrespective of the associated cost. This effort is noted in the City's low S50 performance rate of 1.14 total 5S0 rate [4] per 100 miles of pipe, compared to the Southeastern Region of the US, of 7.0 spills per 100 miles of line. (11 186 miles represents 8% of the sanitary sewer collection system (2[ Associated operational cost year to date for FY2021 OPERATION LINEAR FEET COST CCTV 220,357.31 $ 249,703.36 Flushing 1,134,893 96 $ 384,789.17 Repair 4,810 $1,451,831.56 Total -1,360,061.27 Ft Total cost of 258 MILES Business to Date $2,086,324.09 [31 $.0015 is based on the annual water treatment operating cost compounded by the total treated effluent. (41.24% attributed to dry weather SSOs Additionally, the City of Raleigh Assistant Public Utility Directors and Collections System staff has become involved in challenging the nonwoven fabrics industry standards to better inform consumers of these products and their detrimental effects on the collections systems. PUD staff has personally met with officers of INDA, the leading association of the nonwoven fabrics industry based in Cary, NC, to communicate our concerns about these fabrics, the current industry standards, and better education for the consumer. PUD has also joined forces with other utilities nationwide through the National Association of Clean Waters Agencies (NACWA), the Water Environment Foundation (WEF), and the American Public Works Association (APWA) to challenge INDA and current industry standards, recognizing that they do not support compatibility in sanitary sewer collections systems nationally. These agencies work collectively to challenge the testing protocols, assessment guidelines, and consumer education and labeling of these non -dispersible. Page 8 of 9 Raleigh Water has an aggressive educational outreach initiative to address illicit discharges such as wipes, fats, oil, and grease to commercial and residential users. Raleigh Water has developed a complimentary property managers resource kit that provides best practice resources for establishing a property -specific awareness program. Each kit contains brochures and complimentary gadgets to help residents manage grease and fat collection and disposal. The resource kit also features a multimedia flash drive with videos and reproducible educational material that property managers can use to educate tenants to reduce the risk of sewer backups caused by the introduction of solids through their residential piping. Each kit costs Raleigh water approximately $85.00 to produce and is provided free of charge to the property management. Raleigh Water is continuously developing initiatives to increase residential and commercial customer partnerships to address grease accumulation and prevent illicit discharges. The educational material and videos can be accessed through social media and the Raleigh Water website https://raleighnc.gov/sewer-maintenance The City continues its monetary reward program or bounty program, which pays out fifty ($50) dollars to any citizen that observes and reports an SSO or conditions that may cause a spill event. This program has been advertised via printed material, a television advertisement campaign, and graphic design "wraps" on Sewer Maintenance vehicles. These graphics on our vehicles function as mobile billboards spreading our message of prevention and offering contact information throughout the service area each day. This program was developed hoping that citizens and customers would become more aware of the signs of an emerging system problem causing the SSO occurrence and become proactive in helping the City prevent these occurrences. Additionally, all customers are notified via their water and sewer utility bills not to discharge improper materials into the sanitary sewer mains. The City also circulates information regarding the discharge of grease into the sewer system and the effects of such deposits. Whenever possible, and upon investigating the root cause of a spill event, PUD Code Enforcement officers develop and send registered informational letters about the spill event to the customer base serviced by the line where the S50 has occurred. This is done to educate our customers in the proper use of the sanitary sewers to prevent disposal of non-flushable items and items harmful to the continuous operation of the collections system. On behalf of the City of Raleigh, I am requesting that the NOV-2020 NOI-0054 issued for the month of December 2020 be fairly reviewed, considering the steps the Department has taken to protect the environment and meet or exceed the requirements of the Collections System Permit. If additional information is required, please contact Matthew Vessie, Sewer Maintenance Superintendent (919) 996- 2312 or T.J. Lynch, Assistant Raleigh Water Director, at (919) 996-2316. rely, Carlos M Perez, ORC Assistance Superintendent, Sewer Maintenance Division City of Raleigh, Public Utilities Department P.O. Box 590 Raleigh, NC 27602-0590 919-996-5929 office 919-278-6020 cell Carlos.perezcamachoPraleiehnc.Gov CC. Robert Massengill, Raleigh Water Director T. J. Lynch, Assistant Raleigh Water Director - Wastewater Matthew P Vessie, Superintendent Sewer Maintenance Division ROY COOPER Caveman MICHAEL S. REGAN Sec afary S. DANIEL SMITH Director NORTH CAROLINA EnvironmentalQeallty CERTIFIED MAIL: 7017 2680 0000 2219 5749 gETURN RECEIPT REQUESTED January 22, 2021 Robert Massengill, Director of Public Utilities City of Raleigh PO Box 590 Raleigh, NC 27602-0590 SUBJECT: NOTICE OF VIOLATION & INTENT TO ISSUE CIVIL PENALTY Tracking No.: NOV 2021-DV 0054 Sanitary Sewer Overflows - December 2020 Collection System Permit No. WQCS00002 Raleigh Collection System Wake County Dear Mr. Massengill: fjjjr F�EB 0 2 A review has been conducted of the self -reported Sanitary Sewer Overflows (SSO's) 5-Day Reports submitted by City of Raleigh. The Division's Raleigh Regional Office concludes that the City of Raleigh violated Permit Condition I (2) of Permit No. WQCS00002 by failing to effectively manage, maintain, and operate their collection system so that there is no SSO (Sanitary Sewer Overflow) to the land or surface waters and the SSO constituted making an outlet to waters of the State for purposes of G.S. 143-215.1(a)(1), for which a permit Is required by G.S. 143-215.1. The Raleigh Regional Office is providing the Clty of Raleigh an opportunity to provide evidence and justification as to why the Clty of Raleigh should not be assessed a civil penalty for the violation(s) that are summarized below: Total Vol Total Surface Incident Start Duration Vol Water Number Date (Mins) Location Cause (Gals) (Gals) DWR Action 202003448 12/9/2020 336 9299 Glenwood Pump station 58,544 58,544 Notice of Violation - Ave, pump station- Asset equipment failure Notice of Intent ID:SNS1085 PS 36 sycamore creek 202003538 12/23/2020 130 3120 Walnut Creek Debris In line 39,000 39,000 Notice of Violation - Parkway Notice of Intent eia—k9-3 North Cerouna DepastmentofEnrrironmental Qualdy I Dtis'onof Water Resources galeil{h Regiono101fice 13800 Betrett Drive I ffslelgh, North Catalina 27809 9i9-791-4200 Incident Start Duration Number Date (Mins) Location Cause Total Vol Total Surface Vol Water (Gals) (Gals) DWR Action 202003591 12/30/2020 78 105 Summershade Grease 780 400 Notice of Violation Court This Notice of Violation / Notice of Intent to Enforce (NOV/NOI) Is being issued for the noted violation. Pursuant to G.S. 143-215.6A, a civil penalty of not more than twenty-five thousand dollars ($25,000.00) may be assessed against any person who violates or fails to act in accordance with the terms, conditions, or requirements of any permit Issued pursuant to G.S. 143-215.1. This office requests that you respond to this Notice, In writing, within 10 business days of its receipt. In your response, you should address the causes of non-compliance, remedial actions, and all other actions taken to prevent the recurrence of similar situations. The response to this correspondence will be considered In this process. Enforcement decisions will also be based on volume spilled, volume reaching surface waters, duration and gravity, impacts to public health, fish kills or recreational area closures. Other factors considered in determining the amount of the civil penalty are the violator's history of non-compllance, the cost of rectifying the damage, whether the spill was Intentional and whether money was saved by non-compliance. If you have any questions, please do not hesitate to contact Mitchell Hayes with the Water Quality Section In the Raleigh Regional Office at 919-791-4200 or via email at mitch.hayes@ncdenr.gov. Sincerely, Scott Vinson, Regional Supervisor Water Quality Regional Operations Section Raleigh Regional Office Division of Water Resources, NCDEQ Cc: Raleigh Regional Office - WQS File Laserfiche t uthCio naD*paemeneafEnvranmwntiIQ4dsty l 0• iD ofWiterResourors Raleigh Reg on*i Dff os l 980D Barran Drive l Ri!. gh, North Caro! ns 27669 +7L.: ^.++ 9i9.79i-4200