COMMISSION MEETING. September 21, Engineering and Construction Team

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2 COMMISSION MEETING September 21, 2016 Engineering and Construction Team Revisions to Standard Procedure ENG 11-01: Use of the WSSC Sewer Model in Conjunction with Phase 1 Hydraulic Planning Analyses Item Number: Table of Contents 1. Commission Summary P-1 2. Overview of The Proposed Changes P-2 3. Resolution P-3 4. Legal Review of Standard Procedures P-4 5. Draft Use of the WSSC Sewer Model in Conjunction P-5 thru P-9 with Phase 1 Hydraulic Planning Analyses SP showing changes 6. Final copy of Use of the WSSC Sewer Model in Conjunction P-10 thru P-13 with Phase 1 Hydraulic Planning Analyses SP 7. Power-point Presentation P-14 thru P-18 Total Number of Pages 18 (without this cover sheet)

3 WASHINGTON SUBURBAN SANITARY COMMISSION COMMISSION SUMMARY AGENDA CATEGORY: Engineering and Construction Team ITEM NUMBER: DATE: September 21, 2016 SUBJECT Briefing and approval of the amended Use of the WSSC Sewer Model in Conjunction With Phase 1 Hydraulic Planning Analyses Standard Procedure No. ENG SUMMARY WSSC staff is proposing new language be added to the existing standard procedure to: 1) define terms used in the procedure; 2) clarify various portions of the procedure; 3) include new development and re-development not subject to an HPA for development in basins with projected 2-year overflows; 4) require start of construction of proposed system improvements for developments generating more than 100,000 gallons per day of new sanitary flow in basins with projected 10-year overflows and; 5) clarify the timeline in the processing of a waiver request to the standard procedure. SPECIAL COMMENTS CONTRACT NO. / REFERENCE NO. COSTS AMENDMENT/ CHANGE ORDER NO. MBE PARTICIPATION N/A N/A N/A N/A PRIOR STAFF/ COMMITTEE REVIEW RECOMMENDATION TO COMMISSION General Manager/CEO, Deputy GM for Operations, Engineering & Construction Team Chief Engineer, General Counsel s Office and Development Services Group Leader. Approve Resolution No and the Use of the WSSC Sewer Model in Conjunction with Phase 1 Hydraulic Planning Analyses Standard Procedure COMMISSION ACTION 1

4 WASHINGTON SUBURBAN SANITARY COMMISSION OVERVIEW OF THE USE OF THE WSSC SEWER MODEL IN CONJUNCTION WITH PHASE 1 HYDRAULIC PLANNING ANALYSES STANDARD PROCEDURE AGENDA CATEGORY: Engineering and Construction Team ITEM NUMBER: DATE: September 21, 2016 Overview WSSC Staff requests to add and amend sections of the existing WSSC Standard Procedure for Use of the WSSC Sewer Model in Conjunction with Phase 1 Hydraulic Planning Analyses (HPA). Amendments to the standard procedure will address the addition of new language to define terms used in the procedure, clarify various portions of the procedures, include new development and re-development not subject to an HPA for development in basins with projected 2-year overflows, require start of construction of proposed system improvements for developments generating more than 100,000 gallons per day of new sanitary flow in basins with projected 10-year overflows and lastly, clarify the timeline in the processing of a waiver request to the standard procedure. WSSC Associate Counsel II, Heather Ashbury worked closely with the Development Services Group to draft the new language and make minor updates to the existing standard procedure. There is minimal to no financial impact for property owners. None of the proposed code changes requires an increase in existing fees or creation of new fees. On, August 29, 2016 this process was reviewed, updated, and found legally sufficient by the WSSC General Counsel s Office. November 1, 2016 Effective Date of amended Use of the WSSC Sewer Model in Conjunction with Phase 1 Hydraulic Planning Analyses Standard Procedure 2

5 RESOLUTION NO.: Adopted: September 21, 2016 Effective Date: November 1, 2016 WASHINGTON SUBURBAN SANITARY COMMISSION Subject: A RESOLUTION adopting an amended Standard Procedure (SP) to replace SP ENG Use of the WSSC Sewer Model in Conjunction with Phase I Hydraulic Planning Analyses. WHEREAS, the Commission adopted Standard Procedure (SP) ENG on November 16, 2011 pursuant to its authority to adopt rules and regulations as set forth in the Maryland Annotated Code, Article 29, (which section has since been recodified as Maryland Annotated Code, Public Utilities Article (PUA), ); and WHEREAS, SP ENG is a Commission regulation which establishes a sewer modeling procedure to reduce Sanitary Sewer Overflows (SSOs) and excessive sewer surcharging; and WHEREAS, SP ENG was developed per the requirements of the Consent Decree (Civil Action No. PJM , Messite, 2005); and WHEREAS, the Commission Staff desires to make certain changes and clarifications to SP ENG 11-01; and WHEREAS, a copy of the proposed amendment to SP ENG is attached hereto; and NOW, THEREFORE, BE IT RESOLVED, this 21st day of September, 2016, that the Washington Suburban Sanitary Commission hereby adopts the attached regulation amending SP ENG 11-01; and BE IT FURTHER RESOLVED, that notice of this Resolution and the actions taken hereunder be published in at least one (1) newspaper published in each county of the Washington Suburban Sanitary District prior to October 1, 2016; and BE IT FURTHER RESOLVED, that this Resolution and the attached amended regulation shall take effect on November 1, A True Copy. Sheila R. Finlayson, Esq. Corporate Secretary 3

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7 STANDARD PROCEDURES OF THE WASHINGTON SUBURBAN SANITARY COMMISSION ORIGINATOR & POSITION Gary Gumm Engineering & Construction Team Chief SP NUMBER REG-IFSM- EC SUPERSEDES ENG APPROVE BY/DATE COMMISSION September 21, 2016 EFFECTIVE DATE November 1, 2016 RECURRING REVIEW PERIOD: SUBJECT: USE OF THE WSSC SEWER MODEL IN CONJUNCTION WITH PHASE 1 HYDRAULIC PLANNING ANALYSES Definitions* Base sanitary flow Proposed sanitary flow generated from new or re-development as determined using base sanitary flow factors listed in the WSSC Pipeline Design Manual. CIP Sized Sewer Lines Gravity sewers with an inside diameter 15-inches or greater. Overflow Wastewater exiting the top of any structure in the wastewater collection system (including manholes, vaults, wetwells and other facilities) and flowing out of the structure onto the ground surface or into a water body. This definition does not take into consideration structures with welded or sealed lids. Projected Overflow Overflow predicted by the WSSC Sewer Model. Projected Future Base Sanitary Flow Flow projections based on the latest demographic projections as published by the Metropolitan Washington Council of Governments. Release for Service: The date ownership of the improvement transfers from the Applicant/Owner/Developer to WSSC. Upon issuance of the Release for Service, the Applicant agrees that title to the water and/or sewer system and appurtenances transfers to WSSC and WSSC shall assume ownership, maintenance and operation responsibility for the water and/or sewer system and appurtenances within the bounds of the easement conveyed to WSSC and in the public right of way. Safe Pumping Capacity The measured flowrate that a wastewater pumping station is capable of pumping with the largest pump out of service based on the latest published Pump Station Capacity Evaluation as required by the Consent Decree, Civil Action No. PJM , Messite, Safe pumping capacity shall be the basis utilized when evaluating pump station capacity. Start of Construction The date upon which all of the following have been completed by the Applicant, as determined by WSSC: Design Plans approved by WSSC, SEP, or DRP permit obtained, Performance Bonds provided, all necessary easements obtained and recorded, all necessary permits for construction obtained and construction has actually started. Surcharge A condition in which the hydraulic grade in a gravity sewer is greater than the interior diameter of the sewer. * For terms not defined herein, see the Development Services Process Manual Code, effective April 15, 2016, 3 yrs. Deleted: <object> Deleted:... PAGE 1 Formatted Table OF 4 Inserted Cells Deleted: Formatted: Space Before: 4.5 pt Deleted: Craig Fricke Planning Group Leader Deleted: ENG Formatted: Space Before: 4.5 pt, After: 0 pt Deleted: 2 Formatted: Highlight Deleted: May Formatted: Space Before: 12 pt, After: 0 pt Deleted: 2009 Formatted: Highlight Deleted: March 18, 2009 Formatted: Highlight Formatted: Highlight Formatted: Highlight Inserted Cells Deleted: Formatted: Indent: Left: -0.25", First line: 0.25", Don't adjust space between Latin and Asian text Formatted: Underline Deleted: and Terms: Formatted: Font: Not Bold Deleted: See Deleted:, Effective July 1, 2004.

8 SP NUMBER Deleted: 2 WSSC STANDARD PROCEDURES PAGE 2 of 4 Formatted: Tab stops: 4.38", Left or any successor document. Purpose To establish the procedure for use of the WSSC Sewer Model during SEP Phase 1 Hydraulic Planning Analyses (HPA), other development or redevelopment in order to reduce to the maximum extent practical the probability of Sanitary Sewer Overflows (SSO) and excessive sewer surcharging in accordance with the purpose and intention of Section V, Article Five of the Consent Decree, Civil Action No. PJM , Messite, 2005). This procedure applies to CIP-size sewer and all wastewater pumping stations included in the WSSC Sewer System Model. As described below, the WSSC Sewer Model may be used to assess the potential impact of proposed developments on the affected CIP size sewer system and determine any required conditions for service to be included in the Letter of Findings by WSSC. The adequacy of local sewers (i.e. non-cip-size) will continue to be evaluated by the Development Services Group. Proposed Development above Projected 2-Year Overflow This section shall apply to all proposed new developments or re-development (with an SEP or Site Utility Plan) that increase base sanitary flow from the site connecting into or upstream of any CIP-size trunk sewer stretches or any wastewater pumping stations that have projected overflows based on existing dry weather flow (including groundwater infiltration) and rainfall dependent infiltration and inflow from a 2-year design storm specified by WSSC. The applicants for such developments shall be required, as a condition for service, to obtain a Release for Service (RFS) from WSSC for the sewer system improvements needed to eliminate excessive surcharging, as determined by WSSC, under the 2-year storm after addition of the proposed base sanitary flow from the development under review. Consideration and evaluation of alternate solutions including construction of new sewer lines and facilities and/or rehabilitation/reconstruction of existing sewer mains, appurtenances, and facilities may be required. Any new sewers or facilities built shall be sized to handle projected future base sanitary flow and the infiltration and inflow from the 10-year design storm. In addition, the development will be evaluated for the potential impact of any projected surcharging and, in particular, the potential for causing backups into homes or businesses. Any surcharging in a sewer segment that contains service connections in which the hydraulic grade within the sewer is higher than the basement floor elevation (for structures with basements) or first floor elevation (for structures without basements) is prohibited as the condition will potentially cause sewage backups into the structures. The applicants for such developments shall be required, as a condition for service, to obtain a Release for Service (RFS) from WSSC for the sewer system improvements that eliminate back-ups under the 2-year storm after addition of the proposed base sanitary flow from the development under review. All Other Proposed Development: All other proposed development projected to generate new base sanitary flow of over 100,000 net gallons per day (gpd) into a CIP-size trunk sewer or wastewater pumping station shall be modeled to determine potential impact on that CIP-size trunk sewer or wastewater pumping station. Modeling conditions shall include the existing sewer system, any proposed sewer system improvements under construction at the time of the HPA or HPA amendment under review by WSSC, existing dry weather flows (including groundwater infiltration), rainfall dependent infiltration and inflow from a 10-year design storm specified by WSSC, the proposed base sanitary flow from the development under review, and the proposed base sanitary flow from any other Deleted: Deleted: OF 2 Formatted: Tab stops: -1", Left ", Left + 0", Left + 0.5", Left + 1", Left + 1.5", Left + 2", Left + 2.5", Left + 3", Left + 3.5", Left + 4", Left ", Left + 5", Left + 5.5", Left + 6", Left + 6.5", Left + 7", Left + 7.5", Left Formatted: Underline Deleted: : Formatted: Underline Deleted: I Deleted: See Development Services Process Manual, Effective July 1, 204.) As described below, the Sewer Model may be used to assess the potential impact of proposed developments on the affected CIP size sewer system and determine any required conditions for service to be included in the Letter of Findings by WSSC Formatted: Font: Italic, Font color: Dark Blue Formatted: Font: Not Italic, Font color: Auto Formatted: Font: Not Italic, Font color: Auto Deleted: developed under the Consent Decree. Deleted: This procedure applies to CIP-size sewers and all wastewater pumping stations included in the WSSC Sewer System Model (developed under the Consent Decree, Civil Action No. PJM , Messite, 2005). Any evaluation including a... Formatted: Underline Deleted: : Formatted: Underline Deleted: our Deleted: of Deleted: uear Deleted: implement Deleted: that Deleted: applicant for Deleted: required to evaluate Deleted: No Deleted: will be allowed Deleted: any Deleted: with existing or potential future Formatted: Font: Bold, Underline Formatted: Underline Deleted: a Deleted: of base sanitary flow Deleted: the development under review

9 SP NUMBER WSSC STANDARD PROCEDURES PAGE 3 of 4 developments in the subject sewer basin with an approved and unexpired HPA that are also projected to generate more than 100,000 net gallons per day. Under these conditions, there shall be no projected overflows from the sewer system caused or exacerbated by the proposed development. Otherwise, the applicant shall be required to implement sewer system improvements that eliminate the risk of overflows under the 10-year storm and eliminate excessive surcharging under a 2-year design storm specified by WSSC. Consideration and evaluation of alternate solutions including construction of a new sewer lines and facilities and/or rehabilitation/reconstruction of existing sewer mains, appurtenances, and facilities may be required. Any new sewers or facilities built shall be sized to handle the projected future base sanitary flow and infiltration and inflow from the 10-year design storm. In addition, the development will be evaluated for the potential impact of any projected surcharging and, in particular, the potential for causing backups into homes or businesses. WSSC may allow service to the development prior to the Release for Service of the sewer system improvements required herein only if the Applicant shows proof of Start of Construction of the sewer improvements, as defined herein. Depending on the size and scope of the required sewer improvements, WSSC may also place additional conditions upon Applicant prior to allowing WSSC service to the development at Start of Construction. Additional requirements, if any, shall be set forth in a Memorandum of Understanding signed by the Applicant and WSSC on or before the date that the SEP is issued for the required sewer improvements. HPA Amendments Proposed developments shall be re-evaluated by WSSC at the time of any Letter of Findings amendment if there is any increase in the projected flow from the development into any off site sewers. Developments may also be re-evaluated by WSSC if any contiguous developments are submitted by the same applicant and the combined base sanitary flow exceeds the 100,000 gpd threshold. The results of the WSSC Sewer Model are valid as long as the HPA or HPA amendment Letter of Findings is valid. Request for Waiver Applicants for developments that are subject to this Standard Procedure ( SP ) may request a waiver of some or all of this SP s provisions hereof in accordance with the following requirements. Formatted: Tab stops: 4.38", Left Deleted: 2 Deleted: Deleted: OF 2 Formatted: Tab stops: -1", Left ", Left + 0", Left + 0.5", Left + 1", Left + 1.5", Left + 2", Left + 2.5", Left + 3", Left + 3.5", Left + 4", Left ", Left + 5", Left + 5.5", Left + 6", Left + 6.5", Left + 7", Left + 7.5", Left Deleted:, as a condition for service, Deleted: Deleted: flow and the 10-year design storm Deleted: In addition, the applicant for development will be required to evaluate the potential impact of any projected surcharging and, in particular, the potential for causing backups into homes or businesses. No surcharging will be allowed in any sewer with existing or potential future service connections. Re-Test: Deleted: retested Deleted: retested Formatted: Font: Bold Deleted: RREEQQUUEESSTT FFOORR WWAAI IIVVEERR :: : Formatted: Font: Not Italic, Font color: Auto, Not Engrave Deleted: AA... Formatted: Numbered + Level: 1 + Numbering Style: A, B, C, + Start at: 1 + Alignment: Left + Aligned at: 0.25" + Indent at: 0.75", Hyphenate, Don't adjust space between Latin and Asian text Formatted: Font: Not Italic, Font color: Auto, Not Engrave A. Procedural Requirements 1. A Request for Waiver ( Request ) shall be in writing and shall be filed with WSSC s Corporate Secretary. Each filing shall consist of one (1) paper original and one (1) paper copy, and must be executed by a duly authorized officer, director or principal of the applicant. 2. A Request shall be filed no more than thirty (30) days after the occurrence of the facts and circumstances on which the Request relies in demonstrating compliance with the legal standard set forth herein. A Request shall be complete upon filing, and shall contain documents, records and other evidence supporting all assertions of fact therein. 3. To demonstrate that grant of the Request is in the public interest, the applicant shall include Formatted: Font: Not Italic, No underline, Font color: Auto, Not Engrave Formatted: Font: Not Italic, Font color: Auto, Not Engrave Deleted: Formatted: Font: Not Italic, Font color: Auto, Not Engrave Formatted: Hyphenate, Tab stops: Not at -1" " Formatted: Hyphenate, Tab stops: Not at -1" "

10 SP NUMBER Deleted: 2 WSSC STANDARD PROCEDURES PAGE 4 of 4 Formatted: Tab stops: 4.38", Left Deleted: with its Request a signed letter from the County Executive and/or the Chair of the County Council in which the development is located stating that the County Executive and/or Chair: carefully reviewed the Request; understands why the Request is necessary; supports the Request; and recommends grant of the Request by the Commission. 4. Upon receipt, the Corporate Secretary shall: (a) assign a Log Number to the Request, (b) notify the Chair and Vice-Chair of receipt of the Request; (c) arrange to have notice of the Request appear on WSSC s Internet homepage ( within three (3) business days of receipt; and (d) forward the original to the General Manager/CEO. 5. Upon receiving the Request from the Corporate Secretary, the General Manager/CEO shall have thirty (30) days to review the Request, assess its merits and prepare a recommendation to the Commission regarding the Request s disposition. In preparing a recommendation, the General Manager/CEO may consider any public comment received during the thirty (30) day period. 6. The Commission shall act on the Request within 60 days of receiving the General Manager/ CEO s written recommendation, which time period may be extended by agreement of the Applicant and the General Manager/CEO. The Corporate Secretary shall notify the applicant in writing of the Commission s action on the Request within five (5) business days thereof. B. Commission Action and Legal Standard 1. The Commission may deny the Request or grant it in whole or in part. The Commission may impose conditions it deems appropriate on any grant of the Request. 2. Any grant in whole or in part shall be based on the Commission s determination that: Deleted: OF 2 Deleted: iinn i tte ternn ete tt sis iit tte e ((wwwwww. (..wws sscwwaa tte ter...c coo mm) )) uu nn dd... ere r Deleted: TThh e GGe enn ere raa ll l MMaannaagge er/ //CCEEOO shh s aa lll l... Deleted:... Deleted: aa nn dd shh s aa lll l aa rrr raa nn gg e ffoo f r nn ewws e spp aa pp ere r... Formatted: Justified Deleted: BB... Formatted: Justified Deleted: (a) (b) (c) considering the specific facts and circumstances presented in the Request, application of those SP provisions for which a waiver is sought will be unduly burdensome or will cause an undue hardship; the underlying purpose of the SP will be disserved or frustrated by applying its requirements to the facts and circumstances set forth in the Request; and the granting of the Request will be in the public interest. Formatted: Indent: First line: 0.5" Deleted: Formatted: Indent: First line: 0.25" Formatted: Indent: Left: 0.5", Hyphenate Deleted: )). ).. Deleted: gg raa r nn tt t Formatted: Indent: Left: 1", Hyphenate Formatted: Hyphenate Deleted: DISTRIBUTION LIST:...

11 STANDARD PROCEDURES OF THE WASHINGTON SUBURBAN SANITARY COMMISSION ORIGINATOR & POSITION Gary Gumm Engineering & Construction Team Chief SP NUMBER REG-IFSM- EC SUPERSEDES ENG APPROVE BY/DATE COMMISSION September 21, 2016 EFFECTIVE DATE November 1, 2016 RECURRING REVIEW PERIOD: 3 yrs. PAGE 1 OF 4 SUBJECT: USE OF THE WSSC SEWER MODEL IN CONJUNCTION WITH PHASE 1 HYDRAULIC PLANNING ANALYSES Definitions* Base sanitary flow Proposed sanitary flow generated from new or re-development as determined using base sanitary flow factors listed in the WSSC Pipeline Design Manual. CIP Sized Sewer Lines Gravity sewers with an inside diameter 15-inches or greater. Overflow Wastewater exiting the top of any structure in the wastewater collection system (including manholes, vaults, wetwells and other facilities) and flowing out of the structure onto the ground surface or into a water body. This definition does not take into consideration structures with welded or sealed lids. Projected Overflow Overflow predicted by the WSSC Sewer Model. Projected Future Base Sanitary Flow Flow projections based on the latest demographic projections as published by the Metropolitan Washington Council of Governments. Release for Service: The date ownership of the improvement transfers from the Applicant/Owner/Developer to WSSC. Upon issuance of the Release for Service, the Applicant agrees that title to the water and/or sewer system and appurtenances transfers to WSSC and WSSC shall assume ownership, maintenance and operation responsibility for the water and/or sewer system and appurtenances within the bounds of the easement conveyed to WSSC and in the public right of way. Safe Pumping Capacity The measured flowrate that a wastewater pumping station is capable of pumping with the largest pump out of service based on the latest published Pump Station Capacity Evaluation as required by the Consent Decree, Civil Action No. PJM , Messite, Safe pumping capacity shall be the basis utilized when evaluating pump station capacity. Start of Construction The date upon which all of the following have been completed by the Applicant, as determined by WSSC: Design Plans approved by WSSC, SEP or DRP permit obtained, Performance Bonds provided, all necessary easements obtained and recorded, all necessary permits for construction obtained and construction has actually started. Surcharge A condition in which the hydraulic grade in a gravity sewer is greater than the interior diameter of the sewer. * For terms not defined herein, see the Development Services Process Manual Code, effective April 15, 2016, or any successor document.

12 SP NUMBER WSSC STANDARD PROCEDURES PAGE 2 of 4 Purpose To establish the procedure for use of the WSSC Sewer Model during SEP Phase 1 Hydraulic Planning Analyses (HPA), other development or redevelopment in order to reduce to the maximum extent practical the probability of Sanitary Sewer Overflows (SSO) and excessive sewer surcharging in accordance with the purpose and intention of Section V, Article Five of the Consent Decree, Civil Action No. PJM , Messite, 2005). This procedure applies to CIP-size sewer and all wastewater pumping stations included in the WSSC Sewer System Model. As described below, the WSSC Sewer Model may be used to assess the potential impact of proposed developments on the affected CIP size sewer system and determine any required conditions for service to be included in the Letter of Findings by WSSC. The adequacy of local sewers (i.e. non-cip-size) will continue to be evaluated by the Development Services Group. Proposed Development above Projected 2-Year Overflow This section shall apply to all proposed new developments or re-development (with an SEP or Site Utility Plan) that increase base sanitary flow from the site connecting into or upstream of any CIP-size trunk sewer stretches or any wastewater pumping stations that have projected overflows based on existing dry weather flow (including groundwater infiltration) and rainfall dependent infiltration and inflow from a 2-year design storm specified by WSSC. The applicants for such developments shall be required, as a condition for service, to obtain a Release for Service (RFS) from WSSC for the sewer system improvements needed to eliminate excessive surcharging, as determined by WSSC, under the 2-year storm after addition of the proposed base sanitary flow from the development under review. Consideration and evaluation of alternate solutions including construction of new sewer lines and facilities and/or rehabilitation/reconstruction of existing sewer mains, appurtenances, and facilities may be required. Any new sewers or facilities built shall be sized to handle projected future base sanitary flow and the infiltration and inflow from the 10-year design storm. In addition, the development will be evaluated for the potential impact of any projected surcharging and, in particular, the potential for causing backups into homes or businesses. Any surcharging in a sewer segment that contains service connections in which the hydraulic grade within the sewer is higher than the basement floor elevation (for structures with basements) or first floor elevation (for structures without basements) is prohibited as the condition will potentially cause sewage backups into the structures. The applicants for such developments shall be required, as a condition for service, to obtain a Release for Service (RFS) from WSSC for the sewer system improvements that eliminate back-ups under the 2-year storm after addition of the proposed base sanitary flow from the development under review. All Other Proposed Development: All other proposed development projected to generate new base sanitary flow of over 100,000 net gallons per day (gpd) into a CIP-size trunk sewer or wastewater pumping station shall be modeled to determine potential impact on that CIP-size trunk sewer or wastewater pumping station. Modeling conditions shall include the existing sewer system, any proposed sewer system improvements under construction at the time of the HPA or HPA amendment under review by WSSC, existing dry weather flows (including groundwater infiltration), rainfall dependent infiltration and inflow from a 10-year design storm specified by WSSC, the proposed base sanitary flow from the development under review, and the proposed base sanitary flow from any other developments in the subject sewer basin with an approved and unexpired HPA that are also projected to generate more than 100,000 net gallons per day.

13 SP NUMBER WSSC STANDARD PROCEDURES PAGE 3 of 4 Under these conditions, there shall be no projected overflows from the sewer system caused or exacerbated by the proposed development. Otherwise, the applicant shall be required to implement sewer system improvements that eliminate the risk of overflows under the 10-year storm and eliminate excessive surcharging under a 2-year design storm specified by WSSC. Consideration and evaluation of alternate solutions including construction of a new sewer lines and facilities and/or rehabilitation/reconstruction of existing sewer mains, appurtenances, and facilities may be required. Any new sewers or facilities built shall be sized to handle the projected future base sanitary flow and infiltration and inflow from the 10-year design storm. In addition, the development will be evaluated for the potential impact of any projected surcharging and, in particular, the potential for causing backups into homes or businesses. WSSC may allow service to the development prior to the Release for Service of the sewer system improvements required herein only if the Applicant shows proof of Start of Construction of the sewer improvements, as defined herein. Depending on the size and scope of the required sewer improvements, WSSC may also place additional conditions upon Applicant, as determined by WSSC, prior to allowing WSSC service to the development at Start of Construction. HPA Amendments Proposed developments shall be re-evaluated by WSSC at the time of any Letter of Findings amendment if there is any increase in the projected flow from the development into any off site sewers. Developments may also be re-evaluated by WSSC if any contiguous developments are submitted by the same applicant and the combined base sanitary flow exceeds the 100,000 gpd threshold. The results of the WSSC Sewer Model are valid as long as the HPA or HPA amendment Letter of Findings is valid. Request for Waiver Applicants for developments that are subject to this Standard Procedure ( SP ) may request a waiver of some or all of this SP s provisions hereof in accordance with the following requirements. A. Procedural Requirements 1. A Request for Waiver ( Request ) shall be in writing and shall be filed with WSSC s Corporate Secretary. Each filing shall consist of one (1) paper original and one (1) paper copy, and must be executed by a duly authorized officer, director or principal of the applicant. 2. A Request shall be filed no more than thirty (30) days after the occurrence of the facts and circumstances on which the Request relies in demonstrating compliance with the legal standard set forth herein. A Request shall be complete upon filing, and shall contain documents, records and other evidence supporting all assertions of fact therein. 3. To demonstrate that grant of the Request is in the public interest, the applicant shall include with its Request a signed letter from the County Executive and/or the Chair of the County Council in which the development is located stating that the County Executive and/or Chair: carefully reviewed the Request; understands why the Request is necessary; supports the Request; and recommends grant of the Request by the Commission.

14 SP NUMBER WSSC STANDARD PROCEDURES PAGE 4 of 4 4. Upon receipt, the Corporate Secretary shall: (a) assign a Log Number to the Request, (b) notify the Chair and Vice-Chair of receipt of the Request; (c) arrange to have notice of the Request appear on WSSC s Internet homepage ( within three (3) business days of receipt; and (d) forward the original to the General Manager/CEO. 5. Upon receiving the Request from the Corporate Secretary, the General Manager/CEO shall have thirty (30) days to review the Request, assess its merits and prepare a recommendation to the Commission regarding the Request s disposition. In preparing a recommendation, the General Manager/CEO may consider any public comment received during the thirty (30) day period. 6. The Commission shall act on the Request within 60 days of receiving the General Manager/ CEO s written recommendation, which time period may be extended by agreement of the Applicant and the General Manager/CEO. The Corporate Secretary shall notify the applicant in writing of the Commission s action on the Request within five (5) business days thereof. B. Commission Action and Legal Standard 1. The Commission may deny the Request or grant it in whole or in part. The Commission may impose conditions it deems appropriate on any grant of the Request. 2. Any grant in whole or in part shall be based on the Commission s determination that: (a) (b) (c) considering the specific facts and circumstances presented in the Request, application of those SP provisions for which a waiver is sought will be unduly burdensome or will cause an undue hardship; the underlying purpose of the SP will be disserved or frustrated by applying its requirements to the facts and circumstances set forth in the Request; and the granting of the Request will be in the public interest.

15 STANDARD PROCEDURE ENG REVISION Commission Meeting September 21, 2016 Tom Hilton Planning Group Ray Chicca - Development Services Group 14

16 BACKGROUND AND PURPOSE Consent Decree Purpose of SP History of SP 15

17 SP ENG CURRENT REQUIREMENTS SYSTEM IMPACT EVALUATION Initial Evaluation for all Development Additional Subsequent Evaluations may be Required OTHER PROCEDURES 16

18 ENG REVISION September 21, 2016 PURPOSE OF CHANGES HIGHLIGHTS OF CHANGES MADE 17

19 QUESTIONS? 18