Loading...
HomeMy WebLinkAboutCC AG PKT 2004-09-27 #M AGENDA REPORT DATE: September 27, 2004 TO: Honorable Mayor and City Council FROM: Mark K. Vukojevic, Interim Director of Public Works /City Engineer THRU: John B. Bahorski, City Manager SUBJECT: REGIONAL WATER QUALITY CONTROL BOARD SEWER WASTE DISCHARGE REQUIREMENTS RESPONSE LETTER SUMMARY OF REQUEST: The proposed City Council action will receive and file the Status Report on the Capacity Assurance and Sewer System Rehabilitation Plans in accordance with the General Waste Discharge Requirements for Sewage Collection Agencies in Orange County, Order No. R8- 2002 -0014. BACKGROUND: In April 2002, the Regional Water Quality Control Board (RWQCB), Santa Ana Region, issued Order No. R8- 2002 -0014, General Waste Discharge Requirements (WDR) for all Sewage Collection Agencies in Orange County within the Santa Ana Region. This order places requirements on all wastewater agencies in an attempt to stem the rising trend of beach closures and impacts of ocean water quality that sewage spills and leaks can cause. These are called Sanitary Sewer System Overflows (SSO). If these discharges of sewage from any sewage spill or SSO are not fully contained and cleaned up, and there is a discharge of sewage to surface waters of the State, or the SSO causes a nuisance, it is a violation of this order, Sections 13260 and 13376 of the California Water Code, and Section 301 of the Clean Water Act. RWQCB can impose penalties for failure to follow the requirements of this order. The Regional Board letter dated August 4, 2004 requested a status report from each of the sewering agencies regarding the Capacity Assurance and Sewer System Rehabilitation plans as required by the permit. The Public Works Department has prepared a detailed response to the Board and has attached the letter to this report. As noted in the response letter, the City will be responsible for preparing several documents such as the Capacity Assurance Plan, the Sewer System Rehabilitation Plan, Financial Plan and an updated Sewer System Master Plan for 2005. The City has taken many steps in advance of the Regional Board Order such as developing a Sewer System Master Plan in 1999, eliminating 2 sewer pump stations, video taping 100% of the City's sewer system, annual cleaning of the sewer system, reconstruction of several thousand feet of sewer main and reconstruction of 2 sewer pump stations. In addition, the City has been Agenda Item . • compliant with the Order by reducing sewer spills, developing a Sewer Overflow Emergency Response Plan, developing a Preventative Maintenance Plan, and a new Fats, Oils and Grease Ordinance. As outlined in the paragraph above, the Waste Discharge Requirements will require future Capital Improvements, maintenance programs, and additional funding. FISCAL IMPACT: Since any SSO may violate the term of the Order, failure to properly manage and operate the system can result in severe civil monetary fines based upon the severity of the violation. The costs to implement action items in this letter and the future plans are unknown at this time. No fiscal impact is associated with this action. RECOMMENDATION: It is recommended that the City Council receive and file the Status Report on the Capacity Assurance and Sewer System Rehabilitation Plans in accordance with the General Waste Discharge Requirements for Sewage Collection Agencies in Orange County, Order No. R8- 2002 -0014. Prepared By: ; 'J-''- Ma K. Vukojevic, P.E. Interim Director of Public Works /City Engineer N G ED ' I, A P ' RO , D: A Jo B Pski, " ity Manager Attachment: September 14, 2004, Regional Board Waste Discharge Requirements Response Letter • Agenda Item ,� mot` , u � r? » 7- L r , . . ,..: .ar r� z i } t",,,� y1.�a it „ ' £' ter � r - � + ut ' " -E -. � '' -,, -- .-;,4„.=-,Y,. , . ' - -, ..! a5'� .t '-'f',.=-C.../...3-;A:, ! `t r 5 r - i rk -+.my.ti t - m 'r yY � Y "r a $.t r � + s'> yam �'::� -,'-.7-',,4a 3 �' ' e 2 a , . -I t aF a.,., l €c. . - r - • h r - -- �, +.: ..agaq ..,,y,,*,, y o k. -,,-,:,;_:,,:..;.:-..f., w , 4 +r c I '- hi a jf i 5 I. t F- k',. -- ,, * "� i - j�, 31' t- • :*,,,- ' + "' - � �,ia t . F . ' i ?� �i [7. � ,., _ ,-;. 4 'E . ; `, -, a , ,,' g t . -,,r ,L , , r' . . L , r M . ; 17�C �. �.,t , rf .% ,t; : 1 .--.j �7 5. . vj, V _ , - r , v i -: . f 6 7 _ rte, t ,, - ' - ` .r a J ° - �: ORPOA .q 1, L ? i ce A t. e ; . s a r r - r t> a - - ' - �7 -%1-:--ii. „ .4 "e - �'t' :. � � i . r ,' . ` •- . � �c .7 ' r FO:> G' 3 ' „.. ? '' r `= z ��= a�' r, Y , zrr - , ai ,, i , - . s ,k'� • c `8 K a -� 3 t ,, � • - "a , 5 - -._ r 1 R x e 3a ;I / I , -- pp T '' , - a ;S� ,l",s '£ e° n -, , his a3 tE,4,:., / s. '� ` r i 2 > .: s 'Y �"i '""4, T�?�x`'3 k - : . / r f. F'.•- •, * % - ! ” -triY2 ' ^ ' 'S � ' � r Z� r � c ��f y + 4v' Y �� �� _ _aF '4 � � 'a's�. t � .� :.Q/ ? . . u: ti y t ;N t � . 4, ti - , c i}, 't Y *' :=p-. 3- � v : �. :” + ' a ,; -5. . . � .O. } "' i . . r , +., ,!! ,, r H . r± - - . �; y A � - -° r : . is � 4y a '�- 4 r e .'r F1 '' ,5` . _� t 7# . ♦: x a , ,'?� ' -c te rs :xj y , o0 N � -- r 1. ` 4 , ,� � � � s�r ,�Ch�'"';s.. - e - .Y.� �„ � i 11 ® 4 .F.. _ � - ,r ��`�. � 1[�'�i': �,f,.� �i`t' '� `,.,,�., � I � G C 9 27 *�9 \�`�T '+ �.� .er ' _ ' ,; O ` >•t d " . ?^ - ' r,u• 44 ?„0,-,,- - '�:r' ti 3 i , r '``� si +� � t.� ''� { '' 'L-- �'�` "`+a- h� � � �t�; 4 , t5 r n4 �, r `+` ' � , '"' na £:l"F3� -3 # . �✓ h - : � d' L� ;. j , r Y �m s �, z� s°..µ 3's -� t F' i as •� ' --r-a _ _, n .'4 ;42 . i i±�- 1 7, r -, , . ' '' � %S f 7 �` •=r I`!` i . ti �, b cn „ l w. YL r' - .:..f s t .... - r AR Iv r r. d . f` ,�, ''k':th> F." `-. :.:5' t 9 040 fi -s � ",. fiz 2 a ! K r �. , ... , , t ..?, v" r..'_ s a _; I. e r. ���r� s+�.s�k x ���F r _ �.". � ,� .. tr� S t.�� a< a�' - rrc �� t CIBI�� H IS 4 ` l';',':,-,,,:_? '2,'-",^--t''-: L 4 'r ;€ c ' ": :At t r t ', '` =1:', r �, t r ,. - SEAL - BEACH, C AL ORN[A907A - � ;, ,',. : ,t _ . -{+t ,rL x j ? i.-x :. t A^N i S K I ss' zx: , ' ' ,' - 7- k ; fr,�,� - - BE/ TM , -. :- ..`l° kr 1'= �� " w ,y `r� 4 4 4 : 9, . x I' � t £ , ? ., •S t a v : - <"�'c �,�jj• •, t ik -}'.� ° -� '.( 562) 43 '-‘;2--v CI Sezl s h caw ='mss - ... c �e. '� +T tkw ,�v = ;mss. f u � " � L3�� n. . �� :YS _:. ..,,u r -f -� L r re . - -- .. -te r- r u tee. ` -tt- c- -�. �^ t r _,- -,- t t 'k .s "' - r ` a r x r ? - $,"' •-�--, . h - t r.�+'- -, ; y"s r --1,-,-.. r x% , r`. -e - , ��"1 ` �`- .' '-.'' ,,-; 4 , ; ,, ' } = ms s 6y.r s w- w-- r� ,+.:� ,tr y . -,— �. ..5 :..- .. Y '".' -� ,. - _.,,, - . - • • • September 14, 2004 California Regional Water Quality Control Board Santa Ana Region 3737 Main Street, Suite 500 Riverside, California 92501 -3348 Attention: Mr. Gerard J. Thibeault Executive Officer Subject: City of Seal Beach Status Report on the Capacity Assurance and Sewer System Rehabilitation Plans - General Waste Discharge Requirements for Sewage Collection Agencies in Orange County, Order No. R8- 2002 -0014 Dear Mr. Thibeault: This status report provides the City of Seal Beach collection system information requested by your letter dated August 4, 2004. We included the Regional Board's request in Italics, followed by the response provided by the City of Seal Beach: 1. Provide a map and list of all areas oft the sewage collection system and all sewers within the sewage collection system that have average dry weather, and peak dry weather, sewage flows at or above the design capacity for the sewer. Attached Exhibit 1 (two maps) and Exhibit 2 (two maps) provide the informat requested. Exhibit 1 shows the results of the hydraulic analysis of the system with average dry weather flows, and Exhibit 2 illustrates the hydraulic analysis results with the estimated peak dry weather flows. On each map, the requested information is provided as follows: • Depth to diameter ratio 0.51 to 0.75, indicated in blue • Depth to diameter ratio over 0.75 indicated in red Exhibits 3 and 4 are listings of the sewers with calculated depth to diameter ratios over 0.5 for the average and peak dry weather flows. The pipes with depth to diameter ratios of over 0.75 are highlighted in yellow. l \DarafrlelPllO CommmG042 Engineering. CJP and General ddnrin FilesiO42 Leoer File CHRO:N0004 LergerslDD LTR 914 04 CAL /F REG WATER RESPONSE LETTER. doe Mr. Gerard J. Thibeault September 14, 2004 California Regional Water Quality Control Board - Santa Ana Region Page 2 The City of Seal Beach will field verify the calculated capacity deficiencies through field observations and short term flow monitoring. This step is necessary for more refined prioritization of the capital improvements needed to eliminate the capacity deficiencies, and derive the greatest benefit from the funds available for capital improvements. 2. All sewage spills in the past 5 years, and the locations of these spills, that were caused or contributed to by capacity deficiencies. Exhibit 5 is a listing of all sewage spills from the City's system between 2000 and the present. There were eight (8) spills, all due to condition deficiencies, which have been addressed by the City of Seal Beach. 3. The design capacity for each sewer and the engineering basis for the design capacity. This shall include the design standards used for each sewer and the rationale for the design criteria. The standards in the wastewater collection industry are to design and operate sewage collections systems to flow approximately 50% full (D /d =0.5) during peak dry weather flows, in sewers less than 18" in diameter, and 75% full in sewers greater than 21 inches in diameter. These are the same standards used by OCSD. The status report shall identify the D/d standard used in each sewer by each agency to determine the capacity rating for the sewer and whether the sewer is at or above design capacity. The status report shall identify all sewers with flow rates greater than a D/d =0.5 for sewers less than 18 inches in diameter, and D/d =0.75 for sewers with diameters greater than 18 inches. The status report shall identify all sewage flow studies conducted to date that are used in the agencies' sewer system design and provide all engineering design standards used. For any design standards different from the standards in the wastewater collection industry cited above, the status report shall include a detailed rationale for the non - standard design and evidence supporting the rationale. 3.1 City of Seal Beach Design Wastewater Flow Criteria The City of Seal Beach's design wastewater flow criteria is defined by Section 5 of the "City of Seal Beach Design Criteria for Sewer Facilities ", adopted by resolution on December 8, 2003. The following provides the details of the Design Wastewater Flow Criteria: The average dry weather flow (Qadwf) rates for sewers shall be calculated using the unit flow factors contained in Table 1 and the tributary land uses. Where appropriate, and when required by the City of Seal Beach, the unit flow factors shall be evaluated by the design engineer based upon the specific land uses and densities proposed for new development or redevelopment. I1Datafile © Common1042 Engineering, C1P and General Atkin Files&042 Letter File CHRON■2004 L ette IDD LTR 9 14.04 CALIF. REG. WATER RESPONSE LE7TER.doc Mr. Gerard J. Thibeault September 14, 2004 California Regional Water Quality Control Board - Santa Ana Region Page 3 Table 1 Unit Flow Factors Land Use Category Unit Flow Factor Land Use Designation Description Gallons /Acre /Day RHD Residential High Density 2,200 RMD Residential Medium Density 2,000 RLD Residential Low Density 1,850 C Commercial 2,100 R -G Recreational /Grass 130 PLU /R Public Land Use /Recreation 130 O -E Oil Extraction 0 MSSP Main Street Specific Plan 2,100 M -1 Light Manufacturing 3,167 The peak dry weather flow (Q in cubic feet per second (cfs) shall be determined from Qadwf in cfs based upon the following equation: Qpdwf=a Q adwf b Coefficients a and b shall be based upon a minimum of two weeks of flow monitoring where the tributary flow from a new development or redevelopment is added to an existing sewer. Where such information is not available, the following equation shall be used to determine the peak dry weather flow: Qpdwf=2.1 Qadwf 0.92 The determination of the peak dry weather flow shall also consider other factors such as pumped flows and large sewer flow generators. The peak wet weather flow shall be based upon recorded historical information where available and applicable. Otherwise, the peak wet weather flow shall be calculated as the larger of: Qpwwf =3 Qadwf Qpwwf = 1.35 Qpdwf The peak dry weather flow rate in pipes 15- inches and smaller will be limited by the calculated depth to pipe diameter ratio of d/D = 0.5; and 18- inches and larger d/D = 0.64. The pipe shall flow at a calculated depth to pipe diameter ratio of no more than 0.8 with the peak wet weather flow. The unit flow factors shown in Table 1 have been developed based upon the flow monitoring conducted during the preparation of the Sewer Master Plan in 1998. IlDarafrletPU'D Coa Engineering, CP and General Adnrin Fdes1042 LerterFile CHROM2004 LettersdDD LTR 9.14.04 CALIF REG. r1:4T£R RESPONSE LETTER dot Mr. Gerard J. Thibeault September 14, 2004 California Regional Water Quality Control Board - Santa Ana Region Page 4 3.2 Comparison of Seal Beach's Criteria to the Criteria Listed in the Regional Board's Letter Dated August 2004 The City's criteria is identical to that listed in the Regional Board's letter dated August 4, 2004 for sewer pipes 15 -inch and smaller in diameter. The City of Seal Beach allows the pipes larger than 15 -inch to flow at a depth to diameter ratio of 0.64 with peak dry weather flows, based upon the experience of the City's Consultant with severe wet weather flow information available from a nearby collection system. While this is less conservative than the criteria listed in the Regional Board's letter dated August 4, 2004 for the 18 -inch diameter pipe, it is significantly more conservative for the larger pipes. The City of Seal Beach feels that its criteria are appropriate for the specific conditions of its system. 4. A detailed plan and schedule for tasks to be completed to provide the Capacity Assurance Plan and Sewer System Rehabilitation Plan by the deadlines cited in Order No. R8- 2002 -0014. This plan and schedule shall also provide plans and schedules to correct any capacity deficiencies already identified. 4.1 Capacity Assurance Plan The City of Seal Beach's Sewer Master Plan, dated February 1999, evaluated the design capacity of the entire system, and included capital improvement projects to eliminate the calculated capacity deficiencies. The two areas with calculated capacity deficiencies were: • 8th Street, Ocean Boulevard Alley, and 8 Street Alley Sewer from Ocean Boulevard to Electric Avenue • College Park East Sewers in o Basswood Avenue between Aster Street and Lampson Avenue o Ironwood Avenue between Candleberry Avenue and Elder Avenue o Candleberry Avenue between Aster Street and Ironwood Avenue o Elder Avenue between Ironwood Avenue and Oleander Street 8 Street/ Ocean Boulevard/ 8 Street Alley Sewers This project was originally scheduled for implementation in 2005. The deficiency is primarily due to the pumped flow from the 8 Street Pump Station, which has the Pier Pump Station (125 gpm capacity) and First Street IUDarafilelPlt D Camnan1042 Engineering, CIP and General Adnun Fi1es1043 Letter File CHRO 2004 LettersIDD LTR 914.04 CALIF . REG. WATER RESPONSE L£TTER.doc Mr. Gerard J. Thibeault September 14, 2004 California Regional Water Quality Control Board - Santa Ana Region Page 5 Pump Station (85 gpm capacity) flows as its tributary flows. The pipe in the 8 Street Alley has grease problems due to the restaurants along Main Street, and the City cleans this Tine monthly. Although the line is deficient in capacity and surcharges, the City of Seal Beach has no record of spills during the past five years, because it is regularly maintained. The City will be conducting a detailed study of the 1 Street Pump Station, Gold Coast Sewer, Pier Pump Station, and the 8 Street Pump Station to formulate a comprehensive solution to the condition and capacity issues of these facilities during the preparation of the Sewer Master Plan Update in 2005. The recommended improvements will consider the phasing of the development of the currently vacant property between 1 Street and San Gabriel River south of Marina Drive. Additionally, the City of Seal Beach requires the developer of any property to submit an updated Sewer Master Plan. The City requires the developer to "design and construct the sanitary sewer system required to serve the development including any offsite improvements necessary to accommodate the increased flow associated with the subdivision either in its entirety, or by individual phasing ". College Park East Sewers The sewers with calculated capacity deficiencies in College Park East were originally scheduled for replacement in 2004. While these lines have calculated capacity deficiencies, no spills have occurred in the area. Additionally, because of the greater urgencies developed following the completion of the Sewer Master Plan in 1999, the funds originally earmarked for the College Park East projects had to be used for the improvements needed at the Aquatic Park Pump Station and Adolfo Lopez Pump Station projects originally scheduled for 2007 and 2008. Increased construction cost of the Old Town Sewer Replacement projects further diminished the funding available for the College Park East Sewers. The City of Seal Beach conducted flow monitoring in some of the calculated deficiency areas in May 2002. Additional flow monitoring will be conducted to verify the deficiencies, and prioritize the needed projects during the preparation of the Sewer Master Plan Update in 2005. The Capital Improvement Plan for Capacity Improvements and Condition Deficiency Mitigations will be updated based upon the studies detailed above, and in accordance with the schedule included in this response. IlDatafilelPI D Common1042 Engineering. CIP and General Admin Files1042 Letter File CHROM2004 LetterslDD LTR 9 14 04 CALIF. REG. AU ATER RESPOA•SF. LETTER dac Mr. Gerard J. Thibeault September 14, 2004 California Regional Water Quality Control Board - Santa Ana Region Page 6 4.2 Sewer System Rehabilitation Plan The City of Seal Beach completed CCTV inspection of 140,900 feet (96.6 percent) of its collection system facilities in 2003 and 2004. The portions of the system replaced in 2001, consisting of a total length of 1,750 feet, were CCTV inspected at the completion of construction. They have not re- inspected as part of the current condition assessment effort, but will be inspected within the next five years. Approximately 3,215 feet of the gravity system could not be CCTV inspected because of lack of adequate camera access in the area bounded by Marina Drive to the south, San Gabriel River to the west, Seal Beach Mobile Home Park to the north, and 1 Street to the east. When these sewers are replaced, sufficient manholes will be provided to facilitate inspection of the sewers. Additionally, the 4,003 feet of collection system serving the City of Los Alamitos territory north of Lampson Avenue and east of Bolsa Chica Channel, which drains to the College Park East system, was excluded from the City of Seal Beach's CCTV inspection program. It is expected that the evaluation of that area will be completed by the Rossmoor -Los Alamitos Area Sanitary District. The CCTV inspection and system condition assessment work for 2003 covered 92,443 feet of the system in the Old Town and College Park East area. This work was documented in a report entitled "Review of Sewer System Closed Circuit Television Reports and Tapes ", dated February 2003. The review identified the need for improvements to 2,411 feet of pipe in the College Park East area, and 10,967 feet of pipe in the Old Town area. The CCTV inspection work for 2004 started on April 20, 2004, and concluded on June 15, 2004. It covered 48,457 feet of the collection system in Marina Hill, Bridgeport, Old Town, and College Park East. The reports and recordings were delivered to the City's Consultant for review, on July 20, - 2004. All the reports and over 50 percent of the recordings were reviewed in detail, and the system was evaluated in accordance with the PACP rating system. The final review report and the accompanying improvement recommendations will be submitted to the City of Seal Beach in October 2004. Project priorities will be established, and utilized in updating the Capital Improvement Plan, which will include both the Capacity Improvement, and Condition Deficiency Mitigation Projects, as detailed in the schedule provided below. IlDatafile1PN D Common1042 Engineering. C1P and Geneml ddmin Fdes1042 Letter File CFIROPP2004 Letters= LTR 9.14.04 CALIF. REG II:4TER RESPONSE LETTER.doe Mr. Gerard J. Thibeault September 14, 2004 California Regional Water Quality Control Board - Santa Ana Region Page 7 PROJECT SCHEDULE CITY OF SEAL BEACH Capacity Assurance Plan and Sewer System Rehabilitation Plan September 14, 2004 'JOct :Nov '04 'Dec '04 Jan'05 .Feb '05i Mar '05j Apr '05 :May '05i Jun '05 Jul '05 Au. ID ;Task Name . __ -_ 126 :4_7121.5,19 •2;1630 8 22.5,19 3 17'311 1 :CAPACITY ASSURANCE PLAN - - " 2 1. Focused Study of 1st St. Pump Sta.. Gold Coast Sewer, Pier INIESEMENNE=SEassam Pump Sta., and 8th St. Ocean Ave., 8th St Alley Sewer 3 2. Flow Monitoring of College Park East Sewers MN= " - - - -' -- K 4 3. Update Capacity Improvement Projects and Priorities =MR - - -' -- _'' --- 5 4. Prepare Capacity Assurance Plan - - - - - - - 6 5. Submit Plan to Regional Board " -'- -- i^a1a'!® 7 SEWER SYSTEM REHABILITATION PLAN ' 8 1. Condition Assessment of Sewers CCTV'd in 2004 -- 9 2. Update Condition Deficiency Mitigation Projects & Priorities -� - - - - -- "' ' -- - a' 10 3. Prepare Sewer System Rehabilitation Plan 11 4. Submit Plan to Regional Board - - - - -' — --- -. i '12 FINANCIAL PLAN 13 1. Estimate Revenue Requirements for Capacity Improvement & . - -'- Rehabilitation Projects 14 - 2. Estimate Revenue Requirements for System Management, BM= . Operation, Maintenance 15 3. Update Rates to Properly Fund the Sewer System 16 4. Prepare Rate Study Report - 17 5. Prepare New Rate Ordinance .ti Task iiiiirff=ratfa Split Summary 4.3 Financial Plan The City of Seal Beach has a Sewer Enterprise Fund with revenues dedicated to the management, operation, maintenance, and capital improvements of the sewer system. The revenues generated for the management, operation, and maintenance of the system consist of 22 percent of the water bills. In 2000, the City of Seal Beach had revenues of approximately $400,000 from this source. The City's water rates were increased in 2003, which also increased the sewer service charges. The revenues in Fiscal Year 2003 -2004 increased to $531,000. They will increase to approximately $637,000 in 2004 -2005, then to $738,000 in 2005 -2006, and to $782,000 in 2006 -2007. The revenues for the capital improvement projects are derived from the monthly sewer capital improvement charges last updated in 2000. These charges are based upon the water meter size and customer classes, varying from $5.83 per month for a residential 5/8 -inch service, to $1,060 per month X :1042 Engineering, CIF and General.4dmin File6042 Letter Fde CXROM2004 LetterslDD LTR 9.14.04 CALIF. REG. WATER RESPONSE LETTER.dae Mr. Gerard J. Thibeault September 14, 2004 California Regional Water Quality Control Board - Santa Ana Region Page 8 for a 10 -inch commercial /industrial /government meter. The City currently generates approximately $550,000 from capital improvement charges. At the conclusion of the Sewer Master Plan Update in 2005, the Sewer Rate Study will also be updated. It will evaluate the adequacy of the existing capital improvement charges with the updated capital improvement plan, which will include the capacity improvement projects, condition deficiency mitigation projects, and pump station improvement projects. The rates will be updated to adequately fund the management, operation, maintenance, and the capital improvement program of the wastewater system. 5. Whether the agency is continuing to allow new or expanded sewer connections to sewers that have been identified as being at or above capacity. The City of Seal Beach does not allow new or expanded sewer connections to sewers that have been identified as being at or above capacity. The City's Public Works Standard Conditions of Approval for Vesting Tentative and Tentative Subdivision Maps, Section 5, Sewer, requires: 5.1 An updated sewer master plan shall be prepared and submitted for Public Works review and approval. The subdivider shall design and construct the sanitary sewer system required to serve the development including any offsite improvements necessary to accommodate an increased flow associated with the subdivision either in its entirety, or by individual phasing. 5.2 All improvement plans for sewer shall be in conformance with the design standards and criteria of the Department of Public Works. 5.3 The developer shall establish and initiate a financing mechanism for the maintenance, operations, and replacement of any private or public sewer lift stations and force mains required by the project. The City's Design Criteria for Sewer Facilities require that any new development or redevelopment proposed to be added to the existing system verify the adequacy of the existing system to handle the added flows. It requires: Substantiating engineering calculations for design flows; pipe size; pump, motor, generator, wet well size and appurtenant equipment selection; structural design, and bedding /backfill designs shall accompany plan submittals to the City. All calculations shall be sealed and signed by a California registered professional engineer. Where flow from a new development or redevelopment is added to an existing sewer, the existing sewer will be flow monitored for a minimum period IlDarajrlelPff D Conrrrron 042 Engineering. CIP and General Adnrin FilesI042 Letter File CHRO.NI2004 LettersWDD LTR 9.14.04 CALIF. REG !WATER RESPONSE LETTER doe. Mr. Gerard J. Thibeault September 14, 2004 California Regional Water Quality Control Board - Santa Ana Region Page 9 of two weeks to verify the existing minimum, average, and peak dry weather flows. We would like to point out that several areas within the City of Seal Beach boundaries are - provided wastewater collection service by other agencies. These are: • Leisure World, served by the Orange County Sanitation District • Surfside, served by Sunset Beach Sanitary District • College Park West, and Bixby Ranch and Rossmoor Center commercial areas west of Seal Beach Boulevard, served by the Rossmoor -Los Alamitos Area Sanitary District Additionally, a 15 acre area within the City of Los Alamitos boundaries and Rossmoor -Los Alamitos Area Sanitary District service area drains to the City of Seal Beach collection system in College Park East. Our response does not include information on these four (4) systems. Should you have any questions regarding the contents of our status report, or require additional information, please do not hesitate to contact our Deputy City Engineer, Mark Vukojevic, P.E., at (562) 431 -2527 ext. 318. Sincerely, City of Seal -Beach Douglas -A--D es Director of Public Works /City Engineer IlDataftlelPIt D Conmron1042 Engineering. CIP and General ddmin Files 04? Letter File CNRON12004 LeaerstDD LTR 9.14 04 CALIF. REG. WATER RESPONSE LF. TT£R.doc EXHIBIT 1 SEWER SYSTEM MAP WITH AVERAGE DRY WEATHER FLOW RESULTS SEPTEMBER 14, 2004 11DatafilelPllD Camnon1042 Engineering. CIP and General ddmin Filcs1042 Letter File CHRONI2004 LetterslDD LTR 9.14.04 CALIF. REG. HA TER RESPONSE LETTER.dac EXHIBIT 2 SEWER SYSTEM MAP WITH PEAK DRY WEATHER FLOW RESULTS SEPTEMBER 14 2004 V{Dntafiie \PII'D Common\042 Engineering. CIP and General Adntin Filer1042 Lerrer File CHROAL 004 Lette, lDD LTR 914.04 CALIF. REG. 11:4TER RESPONSE LETTER doe EXHIBIT 3 ANALYSIS RESULTS WITH AVERAGE DRY WEATHER FLOWS Slope Dia Qpeak Qave Length U/S MH D/S MH ( %) n (in) Description (cfs) d/D (cfs) (ft) Pump Station No. 35 Tributary Area F06 -316 F06 -315A 0.1 0.013 8 8th St alley 1.14 1.00 0.09 255 F06 -317 F06 -316A 0.1 0.013 8 8th St alley 1.13 1.00 0.08 269 F06 -315A F06 -315 0.1 0.013_ 8 8th St alley 1.14 1.00 0.10 244 F06 -316A F06 -316 0.1 0.013 8 8th St alley 1.13 1.00 0.09 274 F06 -C319 F06 -317 0.1 0.013 8 8th St alley 1.12 1.00 0.07 145 F15 -320 F06 -C319 0.1 0.013 8 8th St 1.11 1.00 0.07 160 F06 -315 F18 -011 1 0.013 8 Electric Ave 1.15 0.76 0.10 8.5 F15 -325 F15 -324 0.1 0.013 8 S. of Ocean Ave 0.20 0.51 0.01 500 F15 -323 F15 -322 0.1 0.013 8 S. of Ocean Ave 0.21 0.52 0.02 439 F15 -324 F15 -323 0.1 0.013 8 S. of Ocean Ave 0.20 0.52 0.01 60 F15 -322 F15 -321 0.1 0.013 8 S. of Ocean Ave 0.21 0.53 0.02 170 F15 -321 F15 -900 0.1 0.013 8 S. of Ocean Ave 0.21 0.54 0.02 331 F15 -367 F15 -900 0.1 0.013 8 S. of Ocean Ave 0.32 0.70 0.05 292 College Park East B01 -A02 B01 -A01 0.10 0.013 12 Seal Beach Blvd 0.72 0.58 0.72 312 B08 -A28 B08 -A27 0.20 0.013 8 Elder Ave 0.29 0.52 0.29 272 B08 -A27 B08 -A26 0.19 0.013 8 Elder Ave 0.29 0.53 0.29 237 B08 -A29 B08 -A28 0.19 0.013 8 Elder Ave 0.29 0.53 0.29 225 B08 -A30 B08 -A29 0.18 0.013 8 Elder Ave 0.28 0.53 0.28 220 B08 -A31 B08 -A30 0.18 0.013 8 Elder Ave 0.28 0.53 0.28 290 B08 -A25 B08 -A24 0.18 0.013 8 Elder Ave 0.30 0.55 0.30 265 B08 -A26 B08 -A25 0.18 0.013 8 Elder Ave 0.29 0.55 0.29 230 B12 -A32 B08 -A31 0.16 0.013 8 Elder Ave 0.28 0.55 0.28 256 Il DaraflelPWO Common104' Engineering. CIP and General ddmm Files1042 Letter File CHRO: \92004 LetterslDD LTR 9 17 04 CALIF REG WATER RESPONSE LETTER doc EXHIBIT 4 ANALYSIS RESULTS WITH PEAK DRY WEATHER FLOWS Slope Dia Qpeak Qave Length U/S MH D/S MH ( %) n (in) Description (cfs) d/D (cfs) (ft) Pump Station No. 35 Tributary Area F01 -290 F01 -289 0.10 0.013 8 4th St 0.2 0.51 0.08 397 C12-093 C01 -016 0.10 0.013 12 5th St 0.88 0.66 0.39 7 C12 -096 C12 -095 0.16 0.013 12 5th St 0.85 0.56 0.37 173 F03 -266A F03 -266 0.10 0.013 6 5th St alley 0.1 0.55 0.04 315 F06 -316 F06 -315A 0.10 - 0.013 8 8th St alley 1.17 1.00 0.09 255 F06 -317 F06 -316A 0.10 0.013 8 8th St alley 1.15 1.00 0.08 269 F06 -315A F06 -315 0.10 0.013 8 8th St alley 1.18 1.00 0.10 244 F06 -316A F06 -316 0.10 0.013 8 8th St alley 1.16 1.00 0.09 274 F04 -306 F04 -305 0.10 0.013 6 6th St alley 0.1 0.55 0.04 599 F05 -310A F05 -310 0.10 0.013 6 7th St alley 0.09 0.52 0.03 279 F15 -320 F06 -C319 0.10 0.013 8 8th St 1.11 1.00 0.07 160 D06 -161 D06 -156 0.09 0.013 10 Bolsa Ave 0.35 0.52 0.14 254 F02 -275 F02 -274 0.10 0.013 6 Central Way 0.12 0.59 0.04 125 F02 -276 F02 -275 0.10 0.013 6 Central Way 0.1 0.55 0.04 106 F06 -315 F18 -011 1.00 0.013 8 Electric Ave 1.19 0.78 0.10 8.5 F01 -289 F02 -268 0.10 0.013 8 Manna Dr 0.21 0.53 0.08 183 D03 -097 C12 -096 0.16 0.013 12 Marvita Ave 0.84 0.56 0.37 245 F19 -391 F19 -390A 0.20 0.013 8 N. of Electric Ave 0.35 0.59 0.14 148 F20 -394 F19 -391 0.20 0.013 8 N. of Electric Ave 0.3 0.54 0.12 263 F15 -367 F15 -900 0.10 0.013 8 S. of Ocean Ave 0.4 1.00 0.05 292 F15 -321 F15 -900 0.10 0.013 8 S. of Ocean Ave 0.26 0.60 _ 0.02 331 F15 -322 F15 -321 0.10 0.013 8 S. of Ocean Ave 0.25 0.59 0.02 170 F15 -323 F15 -322 0.10 0.013 8 S. of Ocean Ave 0.24 0.57 0.02 439 F15 -324 F15 -323 0.10 0.013 8 S. of Ocean Ave 0.23 0.56 0.01 60 F15 -325 F15 -324 0.10 0.013 8 S. of Ocean Ave 0.22 0.55 0.01 500 F06 -C319_ F06 -317 0.10 0.013 8 Ocean Ave Alley 1.13 1.00 0.07 145 College Park East B01 -A02 B01 -A01 0.10 0.013 12 Seal Beach Blvd 1.54 1.00 0.72 312 B01 -A03 B01 -A02 0.13 0.013 15 Lampson Ave 1.53 0.59 0.71 338 B01 -A05 B01 -A04 0.14 _ 0.013 15 Lampson Ave 1.51 0.57 0.70 203 B01 -A06 B01 -A05 0.14 0.013 15 Lampson Ave 1.5 0.57 0.69 325 B01 -A07 B01 -A06 0.14 0.013 15 Lampson Ave 1.48 0.57 0.69 325 B01 -A08 B01 -A07 0.14 0.013 15 Lampson Ave 1.47 0.57 0.68 325 B01 -A04 B01 -A03 0.15 0.013 15 Lampson Ave 1.52 0.56 0.70 300 B01 -A09 B01 -A08 0.14 0.013 15 Lampson Ave 1.46 0.56 0.67 325 B01 -A10 B01 -A09 0.14 0.013 15 Lampson Ave 1.45 0.56 0.67 325 B01 -All B01 -A10 0.14 0.013 15 Lampson Ave 1.43 0.56 0.66 325 B01 -Al2 B01 -All 0.14 0.013 15 Lampson Ave 1.42 0.55 0.65 325 B03 -A14 B01 -A13 0.06 0.013 15 Lampson Ave 1.4 0.72 0.64 244 B03 -A16 603 -A15 0.15 0.013 12 Basswood St 1.35 0.78 0.62 191 B03 -A15 B03 -A14 0.16 0.013 12 Basswood St _ 1.35 0.76 0.62 270 B03 -A17 803 -A16 0.16 0.013 12 Aster St 1.26 0.72 0.57 138 B03 -A18 B03 -A17 0.16 0.013 12 Aster St 1.26 0.72 0.57 233 B03 -A19 B03 -A18 0.16 0.013 12 Aster St 1.25 0.71 0.57 230 B06 -A21 905 -A20 0.16 0.013 12 Aster St 1.11 0.66 0.50 235 B05 -A20 B03 -A19 0.28 0.013 12 Aster St 1.25 0.60 0.57 255 B06 -A22 B06 -A21 0.18 0.013 10 Candleberry Ave 0.97 1.00 0.43 222 B07 -A23 B06 -A22 0.18 0.013 10 Ironwood Ave 0.97 1.00 0.43 268 B08 -A24 B07 -A23 0.18 0.013 10 Ironwood Ave 0.93 0.79 0.41 254 B08 -A25 B08 -A24 0.18 0.013 8 Elder Ave 0.69 1.00 0.30 265 B08 -A26 1308 -A25 0.18 0.013 8 Elder Ave 0.68 1.00 0.29 230 B08 -A27 B08 -A26 0.19 0.013 8 Elder Ave 0.68 1.00 0.29 237 B08 -A28 B08 -A27 0.20 0.013 8 Elder Ave 0.67 1.00 0.29 272 B08 -A29 B08 -A28 0.19 0.013 8 Elder Ave 0.66 1.00 0.29 225 B08 -A30 B08 -A29 0.18 0.013 8 Elder Ave 0.66 1.00 0.28 220 B08 -A31 B08 -A30 0.18 0.013 8 Elder Ave 0.65 1.00 0.28 290 B12 -A32 B08 -A31 0.16 0.013 8 Elder Ave 0.65 1.00 0.28 256 B12 -A33 B12 -A32 0.18 0.013 8 Elder Ave 0.57 1.00 0.24 288 B12 -A34 B12 -A33 0.18 0.013 8 Elder Ave 0.57 1.00 0.24 288 B12 -A35 B12 -A34 0.18 0.013 8 Elder Ave 0.56 1.00 0.24 288 B12 -A36 B12 -A35 0.18 0.013 8 Elder Ave 0.55 1.00 0.23 289 B12 -A37 B12 -A36 0.18 0.013 8 Oleander St 0.33 0.58 0.13 254 B15 -A39 B15 -A38 0.18 0.013 8 Fir Ave 0.31 0.56 0.12 251 B15 -A38 B12 -A37 0.20 0.013 8 Fir Ave 0.32 0.55 0.13 220 816 -A40 B15 -A39 0.18 0.013 8 Fir Ave 0.28 0.52 0.11 259 I!DatafilelPWO Comnton1042 Engineering, CIP and General Atkin Files&042 Letter File CHROM200J LetterslDD LTR 9.14 04 CALIF. REG WATER RESPONSE LETTER.dac • - 0 a) + . d N ' CON CO C d N CO a , O y . N C a. td N d N v a 7 F-' C N j N CI y 0 O = y U C 0 y N • F .c' N N v C 0 0 3: N a) U O CU 0 . C L G L N 0 N 0) — 0 ` 0) y 0 0 O 0I ' a y , m c Cd p D C? 0 '03 0 C C E 0 t d Z C0 O. C N CO L N O )O N 0 T 2 U g U N L 07 a. N vi a c 3 3 O ' N y 010 y 1 C0 p d tV P. O N N U L_ N 7 C U X O g `7 N N L X o c z W W Q w W Z N W y N c O m- < < Q < U.1 W Y t: aa F W Z O N N o Z a$ O O p ce I w NV 7 O N m m 0 m Q m O c j M W .r . O N O co N Q l— p 'd m "if t; Z V) 00 2 N N 0) ,— N _O Ec2 7 t N O O O O co Z N U > J O —I ` - . U 2 m i 0 D O i 2 0 _ U N In h U N j# < w Q ed Q05 F- W Q a 0) z m TL L L i o Q 0) N C CO N Q 0 0) ` CO W i N N 0) f0 a 0) CO N V) N d o C m 0) d N N `O Y 0) W l W O Q D e0 W 7 N a co u Q L 0) = _ C fn O U to Q T .- C N L L an d r m L 0) O> O N (0 N O 2 al j cii Q CO Q N m N L O N U a W 'm 3 0, n, 1_ H t 3 m Q o a a at m isi O O N IX 0 E E W co r 00 co p > : 3 ° o z r — N N V -J W O m e: IX N co co co N O O L W 3 A 0 O O 0 0 O O O > O O 0 0 N N N N N N t O 0) 0 N N O N Cl N N p t0 I!) co O y 0 ) N 0) e' 0) .9 cr 0 0) 0 0 0 0) 0 N N 0) 0 0 _ id C 3 d Cn V) CO f/) 0) 0) 0) !/) O 01 L L L L L L L L N N Q U 0 0 0 0 O U 0 0 0 0 > 0 0 0 0) N - co 0) >. 0) "" d co N m U m U m U m U m U CO U m U m U m _ 0) C To L y V 0 0 0 0) 0) N N N U 0 3 0 f/) 0) v) co to CO CO N ,; O. m to a ' CO - 6 > 0 ` o( `o( ` o ( `o(0 o5 `O( `o5 N Q T o W N z. 0 CO T .. CO T . td C0 ri ce r (Jm Um Um U Um U 5c U ?� C7 C+) P) C•4 O O m 9 O O O O O O 0 O N 0 0 N N N N N N N N N C 1` N 0 N N C) [7 M G o r N N ,_ CO N Q 2 ( ) N C) a (0 I[) f") .. Tr a O. f N M V" CO CO N. 0J r