ࡱ> A?:;B#` |bjbj5G5G  W-W-0 0 0 0 0 0 0 4d PlPlPlhlm4d n.rL^r^r^r tvwl       $h 0 |ss"|| 0 0 ^r^r >|0 ^r0 ^r | z0 0 ^rn >_fPl3$j   zW<0  "xyy0zg"x"x"x  X"x"x"x ||||d d ()D"lK d d ()lKd d d 0 0 0 0 0 0  Pretreatment Compliance Inspection Summary Report Discharger: Yucaipa Valley Water District (YVWD) Location: 12770 Second Street Yucaipa, CA 92399-0730 Contact(s): Matthew Harward, Deputy Manager, YVWD Water Resources Kelly Hahs, Water Quality, YVWD Water Resources Gary DeFrese, Consultant, G&G Environmental Compliance Inspection Date: November 30, 2006 Inspected By: Max Kuker, PG Environmental, LLC Danny OConnell, PG Environmental, LLC Contents  TOC \o "1-5" \h \z  HYPERLINK \l "_Toc155682413" 1. Executive Summary  PAGEREF _Toc155682413 \h 2  HYPERLINK \l "_Toc155682414" 2. Introduction  PAGEREF _Toc155682414 \h 2  HYPERLINK \l "_Toc155682415" 2.1 Size of Program  PAGEREF _Toc155682415 \h 2  HYPERLINK \l "_Toc155682416" 2.2 Description of the Districts Wastewater Treatment Facility  PAGEREF _Toc155682416 \h 2  HYPERLINK \l "_Toc155682417" 3. Pretreatment Program Modifications  PAGEREF _Toc155682417 \h 2  HYPERLINK \l "_Toc155682418" 4. Local Limits  PAGEREF _Toc155682418 \h 2  HYPERLINK \l "_Toc155682419" 5. Legal Authority  PAGEREF _Toc155682419 \h 2  HYPERLINK \l "_Toc155682420" 6. Nondomestic Discharger Characterization  PAGEREF _Toc155682420 \h 2  HYPERLINK \l "_Toc155682421" 7. Control Mechanisms  PAGEREF _Toc155682421 \h 2  HYPERLINK \l "_Toc155682422" 7.1 Issuance of Permits  PAGEREF _Toc155682422 \h 2  HYPERLINK \l "_Toc155682423" 7.1.1 Permitting Procedures  PAGEREF _Toc155682423 \h 2  HYPERLINK \l "_Toc155682424" 7.1.2 Permit Effective and Authorization Dates  PAGEREF _Toc155682424 \h 2  HYPERLINK \l "_Toc155682425" 8. Compliance Monitoring  PAGEREF _Toc155682425 \h 2  HYPERLINK \l "_Toc155682426" 8.1 Compliance Sampling  PAGEREF _Toc155682426 \h 2  HYPERLINK \l "_Toc155682427" 8.2 Compliance Inspections  PAGEREF _Toc155682427 \h 2  HYPERLINK \l "_Toc155682428" 8.3 Nondomestic Discharger Site Inspections Conducted During the Inspection  PAGEREF _Toc155682428 \h 2  HYPERLINK \l "_Toc155682429" 8.4 Requesting, Receiving, and Analyzing Reports  PAGEREF _Toc155682429 \h 2  HYPERLINK \l "_Toc155682430" 8.5 Slug Discharge Control Plans  PAGEREF _Toc155682430 \h 2  HYPERLINK \l "_Toc155682431" 9. Enforcement  PAGEREF _Toc155682431 \h 2  HYPERLINK \l "_Toc155682432" 10. Summary of Requirements and Recommendations  PAGEREF _Toc155682432 \h 2  HYPERLINK \l "_Toc155682433" 10.1 Requirements  PAGEREF _Toc155682433 \h 2  HYPERLINK \l "_Toc155682434" 10.2 Recommendations  PAGEREF _Toc155682434 \h 2  Attachments Water Enforcement Noncompliance Database (WENDB) Reportable Noncompliance (RNC) Data Sheet Nondomestic Discharger Information: Dentsply Ceramco Nondomestic Discharger Information: Sorenson Engineering Yucaipa Valleys Response to the 2005 Pretreatment Audit Nondomestic Discharger Site Visit Forms 1. Executive Summary The Santa Ana Regional Water Quality Control Board (Regional Water Board), with assistance from PG Environmental, LLC (PG), conducted a Pretreatment Compliance Inspection (PCI) of the Yucaipa Valley Water District on November 30, 2006. The last Pretreatment Compliance Audit (PCA) of the Districts pretreatment program had been performed in December 2005. This inspection report describes the primary concerns generated by the recent inspection. The District has hired G&G Environmental Consultants (G&G) to develop and implement the pretreatment program. For the purpose of this report, consultants from G&G are considered members of the Districts staff. The District manages a pretreatment program that consists of three permitted nondomestic dischargers. All three dischargers are classified as significant industrial users (SIUs) as defined at Title 40 of the Code of Federal Regulations (CFR) section 403.3(v), and all three of the SIUs are categorical industrial users (CIUs). The inspection identified a few areas in which the program needs improvement. A review of the Dentsply Ceramco, Sorenson Engineering, and Skat Trak files identified the absence of slug discharge control plan evaluation documentation. Although it appears that the District is completing the evaluations, the files lack the required documentation. A review of the Dentsply Ceramco and Sorenson Engineering permits identified effective dates that predate the actual authorization dates for at least those two permittees, resulting in permit conditions of which the facilities might not be aware. The inspection team also found that Dentsply Ceramcos phosphate treatment rinse appeared to be running at full flow (based on the valve position of the rinse water supply line) with no product being processed. Because the facility has not evaluated how much water is actually required to rinse parts, it might be discharging more wastewater than necessary and thereby causing dilution of its effluent. During a site visit of the Sorenson Engineering facility, the inspection team noted that the facilitys chiller was down for repair. The facility was cooling critical process equipment with once-through cooling water while the chiller was down for repair and discharging the once-through cooling water into the sampling structure via a hose. The District had not been pre-notified of the process modification or the additional flow being discharged to the sewer system. Finally, this report includes several requirements due to the changes to the pretreatment regulations from the promulgation of the pretreatment streamlining provisions. Many of the streamlining provisions are changes that the publicly owned treatment works (POTW) may adopt at its discretion. A few of the provisions, however, require the POTW to revise its legal authority. These required changes include clarification that slug control requirements must be referenced in SIU control mechanisms; revisions to the significant noncompliance (SNC) definition; and modifications to the sampling requirements and a clarification to the requirement to report all monitoring results. 2. Introduction The inspection consisted of three parts: an interview of the Districts pretreatment personnel, a review of the pretreatment program files, and site visits to various permitted industries. The interview included a discussion with several members of the Districts pretreatment and collection system staff regarding the program in general, the Districts compliance sampling and inspection procedures and their frequency, and enforcement issues. The file review consisted of examining the files of all three of the Districts nondomestic dischargers to provide a complete view of the pretreatment program. The files of the following dischargers were reviewed during the inspection: Dentsply Ceramco (CIU subject to 40 CFR 433.15) Sorenson Engineering (CIU subject to 40 CFR 433.15) Skat Trak (CIU subject to 40 CFR 464.15 and 464.35) Two permitted dischargers were also inspected as part of this inspection. The dischargers were selected for inspection on the basis of their categorical classification and wastewater treatment operations. The facilities of the following dischargers were visited during the inspection: Dentsply Ceramco (CIU subject to 40 CFR 433.15) Sorenson Engineering (CIU subject to 40 CFR 433.15) This report summarizes the overall findings of the inspection and describes the program elements that are not consistent with federal pretreatment program requirements. In addition, the report provides recommendations to enhance the effectiveness of program implementation and enforcement. 2.1 Size of Program The Districts staff manages a pretreatment program that consists of three permitted nondomestic dischargers. All three of these dischargers are classified as SIUs, and all three are also CIUs. In addition, the District is in the process of permitting another facility, Hoover Egg, as an SIU. (Note: The previous PCA incorrectly identified the new facility as Hidden Valley Egg Farm.) The permit has been drafted and submitted to the discharger for review. Hoover Eggs final permit was expected to be issued in January 2006, but according to District staff it has been delayed because of an issue with the surcharge fees for biochemical oxygen demand (BOD) and total suspended solids (TSS). The Districts sewer use ordinance (SUO) does not contain surcharge rates for BOD and TSS, and therefore a rate dispute between the District and Hoover Egg has ensued. The District has initiated an inspection program for other non-significant industrial users (NSIUs) such as restaurants, auto shops, dry cleaners, dental offices, and nursing homes. These NSIUs are not permitted, but the District plans to inspect them annually. 2.2 Description of the Districts Wastewater Treatment Facility The District owns and operates the Henry N. Wochholz Regional Water Recycling Facility (RWRF), which provides treatment of residential, commercial, and industrial wastewater generated within the cities of Yucaipa and Calimesa and unincorporated portions of Riverside and San Bernardino counties. The RWRF serves a population of approximately 50,000. The RWRF currently provides tertiary treatment plus ultraviolet disinfection adequate to allow discharges to San Timoteo Creek, a tributary of the Santa Ana River, and the discharge is regulated by National Pollutant Discharge Elimination System (NPDES) Permit No. CA0105619. The RWRF has a design capacity of 4.5 million gallons per day (mgd) and an average dry-weather influent flow of 3.7 mgd. The total permitted flow from industrial dischargers represents less than 1 percent of the daily flow. The RWRF is undergoing construction to increase the design capacity to 8 mgd upon completion, expected in May 2008. The expansion involves major modifications and demolition of many existing facilities. The RWRF will provide treatment using an Integrated Fixed-Film Activated Sludge (IFAS) and tertiary microfiltration process followed by ultraviolet disinfection of the effluent. The treatment processes currently consists of bar screens, aerated grit removal, primary sedimentation, biological treatment using trickling filtration followed by activated sludge, secondary sedimentation, flow equalization, denitrification towers with methanol addition, flocculation, gravity media filtration, and dechlorination with sulfur dioxide.. The solids-handling facilities include dissolved air flotation thickeners, anaerobic digesters, belt presses, and a digester gas utilization facility. 3. Pretreatment Program Modifications The federal pretreatment regulations at 40 CFR 403.18 require the District to notify the Regional Water Board of any modifications it intends to make to its pretreatment program. The District revised its local limits for pH (discussed in Section 4), which requires that the SUO be modified. The Regional Water Board approved the modification of the revised local pH limits. The District is evaluating timelines for local limit and SUO review. The District has revised the inspection frequency for the permitted facilities from semiannually to at least quarterly in an effort to ensure that staff members are equally familiar with all permits and applicable processes, waste streams, and pretreatment systems. The fats, oils and grease (FOG) inspection program has been in place for approximately 6 or 7 months. The program has been designed so that every restaurant within the Districts jurisdiction will be inspected at least once a year. The pretreatment team is currently responsible for completing the inspections. This responsibility will be transferred to the sewer collection team in the near future, but no exact date was provided. The inspection team recommends that the Districts pretreatment program staff continue to work closely with the sewer collection team to ensure that all program requirements are met. The inspection included a review of the Districts response to the findings of the 2004 inspection. Requirements and recommendations resulting from the review are presented in the appropriate sections of this report. 4. Local Limits The federal pretreatment regulations at 40 CFR 403.5(c) require POTWs to develop and enforce local limits to implement the general and specific prohibitions at 40 CFR 403.5(a) and (b). The pretreatment regulations also require POTWs to continue to develop these local limits as necessary and effectively enforce the limits. Furthermore, the NPDES regulations at 40 CFR 122.44(j)(2)(ii) require POTWs to provide a written technical evaluation of the need to revise local limits following permit issuance and reissuance. In addition, the recently promulgated federal streamlining regulations state that POTWs may develop best management practices (BMPs) to implement the general and specific prohibitions. These BMPs shall be considered local limits and pretreatment standards (40 CFR 403.5(c)(4)). The District had recently revised its local limits for pH and submitted them to the Regional Water Board for approval. In the local limits submitted, the District had relaxed the limits for pH. The pH limits were changed from 6.58.5 standard units to 511 standard units. The inspection team informed the District that relaxing these limits is a substantial program modification, as defined at 40 CFR 403.18(c), which is subject to the approval procedures at 40 CFR 403.11. The District provided documentation that the revised pH limits had been submitted to the Regional Water Board and approved. 5. Legal Authority The federal pretreatment regulations at 40 CFR 403.8(f) require that every POTW subject to the national pretreatment program have the necessary legal authority to apply and enforce section 307(b) and (c) and section 402(b)(8) of the Clean Water Act. On October 13, 2005, EPA promulgated several changes to the general pretreatment regulations (streamlining rule). The following table indicates where to find these changes in the newly revised general pretreatment regulations at 40 CFR Part 403. Many of the streamlining provisions are changes that the POTW may adopt at its discretion. A few of the provisions, however, require the POTW to revise its legal authority. These required changes include: 40 CFR 403.8(f)(1)(iii)(B)(6): clarification that slug control requirements must be referenced in SIU control mechanisms IssueSection of 40 CFR Part 403 RuleSampling for pollutant not present403.8(f)(2)(v), 403.12(e)General control mechanisms403.8(f)(1)(iii)Best management practices403.5, 403.8(f), 403.12(b), (e), (h)Slug control plans403.8(f)(1)(iii)(B)(6), 403.8(f)(2)(vi)Equivalent concentration limits for flow-based standards403.6(c)(6)Equivalent mass limits for concentration-based standards403.6(c)(5)Use of grab and composite samples403.12(b), (d), (e), (g), (h)Significant noncompliance criteria403.8(f)(2)(viii)Removal credits403.7(h)Nonsignificant CIU403.3(v)(2), 403.8(f)(2)(v), (6), 403.12(e)(1), (g), (i), (q)Middle Tier CIU403.8(f)(2)(v)(C), 403.12(e)(3), (i)Miscellaneous changes403.12(g), (j), (l), (m) 40 CFR 403.8(f)(2)(viii)(AC): revisions to the SNC definition 40 CFR 403.12(g): modifications to the sampling requirements and a clarification to the requirement to report all monitoring results Therefore, the District is required to revise its legal authority and its pretreatment program to include the three requirements promulgated by the pretreatment streamlining regulations. These revisions are considered nonsubstantial as long as they directly reflect the federal requirements. Because the District is already in the process of evaluating a review timeline for its SUO (see Sections 3 and 4), the inspection team recommends that the District include any streamlining changes with the current SUO modifications. Furthermore, the inspection team reminds the District that before implementing any of the other non-required streamlining provisions, the District must also revise its legal authority. Revisions to the Districts legal authority to incorporate the pretreatment streamlining provisions are considered nonsubstantial as long as the changes directly reflect the federal requirements. The District must notify the Regional Water Board at least 45 days before implementing nonsubstantial modifications. 6. Nondomestic Discharger Characterization The federal pretreatment regulations at 40 CFR 403.8(f)(2) require that POTWs develop and implement procedures to identify and locate industrial users that might be subject to the local pretreatment program. These procedures must also include proper categorization of all SIUs as defined at 40 CFR 403.3(v). The District is implementing adequate procedures to identify industrial users. The District employs several methods for identifying nondomestic dischargers. Other divisions of the District, including the sewer collection team and the Utilities Department, notify the pretreatment staff of potential nondomestic discharge sources identified through their activities. The Utilities Department regularly forwards account activation information and a water usage summary of facilities with usage rates over 10,000 gallons per day. The District also surveys the local phone book, reviews nondomestic dischargers water usage, and regularly performs drive-by inspections of potential nondomestic dischargers (because of the small size of the communities). 7. Control Mechanisms To ensure compliance with applicable pretreatment standards, the federal pretreatment regulations at 40 CFR 403.8(f)(1)(iii) require POTWs to control the discharges from nondomestic dischargers by using control mechanisms (permits or other similar means). The control mechanisms must include, at a minimum, the following: Statement of duration (in no case more than 5 years) Statement of nontransferability Effluent limits, including BMPs based on applicable pretreatment standards Self-monitoring, sampling, reporting, and record-keeping requirements Statement of penalties Compliance schedules (if applicable) Required resampling within 30 days after noticing a violation Slug control requirements (if necessary) Notification requirements Notice of slug loadings Notification of spills, bypasses, or upsets Notification of significant change in discharge Notification within 24 hours after noticing a violation Permits for CIUs must also properly use the combined wastestream formula, properly convert mass-based limits to concentration-based limits, and properly apply production-based limits (if applicable) and must include a prohibition on dilution as a substitute for treatment. The discharger is adequately implementing these control mechanisms. 7.1 Issuance of Permits 7.1.1 Permitting Procedures A review of the Hoover Egg permitting process identified a delay in issuing the permit due to a disagreement regarding the associated wastewater user charges. The District is required to properly regulate all SIUs as defined at 40 CFR 403.3(v). The District is required by 40 CFR 403.8(f) to properly permit all industrial users. The Districts permitting process should not be delayed because of negotiations over wastewater user charges. If a facility fails to comply with the Districts permitting process, enforcement actions should be implemented as specified in the Districts enforcement response plan (ERP). 7.1.2 Permit Effective and Authorization Dates A review of the Districts permitting process identified a concern regarding the issuance of a permit that specifies an effective date that precedes the date of authorization. Examples of such permits are those for Dentsply Ceramco and Sorenson Engineering, which have amended effective dates of August 16, 2006, and authorization signature dates of August21, 2006 (see Attachments C and D). No permit should contain an effective date that predates the signature date on the issuance letter or the authorization signature date on the permit. A permit may, however, be issued to go into effect at some future date (e.g., a permit issued on January 20 may go into effect on February 1 because the previous permit will not expire until January 31). As required at 40 CFR 403.8(f)(1)(iii)(B)(1), permits must contain a statement of duration, which should include an effective date and an expiration date. Permits should be issued prior to their effective dates so that permittees are aware of their limitations, obligations, and requirements before they are held responsible for upholding those permit conditions. The District is required to implement the appropriate changes to ensure that permits are properly dated. 8. Compliance Monitoring The federal pretreatment regulations at 40 CFR 403.8(f)(2)(v) require that a POTW develop and implement an inspection and monitoring program to determine, independent of information supplied by nondomestic dischargers, compliance or noncompliance with applicable pretreatment standards and requirements. Furthermore, 40 CFR 403.8(f)(2)(vii) requires POTWs to investigate instances of noncompliance and enforce the regulations as necessary. 8.1 Compliance Sampling The regulations at 40 CFR 403.8(f)(2)(v) require that all SIUs be sampled at least once a year unless the POTW has authorized a CIU to forego sampling of a pollutant regulated by federal pretreatment requirements. Then the POTW must sample for the waived pollutant(s) at least once during the permit term [40 CFR 403.8(f)(2)(v)(A)]. The inspection team found the Districts compliance sampling activities adequate. The District samples all of its SIUs twice a year. The inspection team noted that Dentsply Ceramco was not reporting a discharge flow with its sampling results as required by its permit. The District staff acknowledged this deficiency but informed the team that a new self-monitoring report (SMR) form has been developed and distributed to all permittees in an effort to resolve the issue. 8.2 Compliance Inspections The regulations at 40 CFR 403.8(f)(2)(v) require that all SIUs be inspected at least once a year, unless a discharger is subject to the reduced reporting requirements under 40 CFR 403.12(e)(3). The POTW must inspect such a discharger at least once every 2 years [40 CFR 403.8(f)(2)(v)(C)]. The inspection team found the Districts compliance inspection activities adequate. The District inspects all of its SIUs at least four times per year. The District has increased the inspection frequency of the permitted facilities from semiannually to at least quarterly in an effort to ensure that staff members are equally familiar with all permits and applicable processes, waste streams, and pretreatment systems. 8.3 Nondomestic Discharger Site Inspections Conducted During the Inspection The inspection team, along with District personnel, inspected two of the permitted nondomestic dischargers as part of the inspection. The dischargers were selected to represent facilities of varying size and classification. The inspection team noted the following during the nondomestic discharger site visits: Dentsply Ceramco. The facility performs metal fabrication, finishing, and assembly of small sheet metal cabinets that serve as exterior enclosures for the dental equipment that they manufacture. The processes performed are metal fabrication, metal finishing, paint removal, and burnout furnace insulation manufacturing. The facilitys process area consists of various plating and rinse tanks, sonic cleaning areas, and a ceramic molding and furnace process area. All waste streams are hard-piped, labeled, and transported through lined troughs to the appropriate treatment or discharge area. The facility discharges, on average, approximately 5,600 gallons of wastewater a day from the phosphate treatment process rinse process and approximately 3,400 gallons of wastewater per day from the vacuum molding process wastewater. Raw materials include ceramic compounds, acids, various raw metals (including gold), and plating and cleaning solutions. The facility has two sampling locations. Sample location 001 is in a sampling manhole outside the building in the area of the offices and laboratories, and it allows sampling of the industrial wastes from the phosphate treatment rinse tank and vacuum ceramic molding process. Local limits are applied to the wastewater quality at this location. Sample location 002 is at the phosphate treatment rinse tank, where federal limits are applied to the wastewater quality. At the time of the inspection, the phosphate treatment rinse appeared to be running at full flow (based on the valve position of the rinse water supply line) without product being processed. The facility has not evaluated how much water is actually needed to rinse parts, and therefore it might be discharging more wastewater than necessary and diluting its effluent. In addition, the phosphate treatment rinse tank has a bottom clean-out valve at ground level, in a position that could allow an accidental opening by a foot. An accidental opening of this valve could allow a slug load discharge from the phosphate treatment reservoir tank to the sanitary sewer system. The District is required to have the facility remove all dilution streams from the categorical monitoring location, in accordance with its permit (Part 5 Standard Condition Number 10) and 40 CFR 433.15(c). The practice of allowing rinse water to run while no product is being processed should be cited as a dilution practice. The facility should be required to evaluate the rinse water needs associated with its product. The facility should not have rinse flow rates that exceed the rate needed. In addition, the facility should be required to modify the bottom clean-out valve to eliminate the potential for accidental releases from the phosphate treatment rinse tank. Sorenson Engineering. The facility manufactures, cleans, and finishes (etches) metal pins, electronic connectors, and related metal parts. Small-diameter metal rods are placed in various machining equipment (approximately 100 machines), which drill, grind, trim, and form the rods into pins for electronic connectors, as well as related metal parts. Following machining operations, the metal parts are carried to the metal-finishing operations and immersed in a cleaning solution to remove surface contaminants. After cleaning and chemical etching, a corrosion-resistant finish is applied to the surface of the metal parts. The wastewater from metal finishing first accumulates in a collection sump. From the sump the waste is directed to the acid waste tank. The wastewater is pumped from the acid waste tank to a treatment tank, where pH adjustment by the addition of sodium hydroxide takes place. Next a coagulant is added to the treatment tank to aid the precipitation of metals. As the metals settle to the bottom of the treatment tank, treated water is pumped from the treatment tank to a cleaned water holding tank. The treated water is discharged from the holding tank through a series of filters prior to discharge to the sewer through meter M-1 and a sampling structure (SP-001) at discharge point DP-001. Discharges occur once a week, and the quantity is approximately 700 gallons per batch. Settled solids from the treatment tank are pumped into the primary sludge collection tank. From that tank, the sludge is directed to a gravity-settling tank for further removal of solids. The settled sludge is directed to a secondary sludge collection tank, from which it is dispensed into collection bags for accumulation. The collection bags are taken to a drying oven for dewatering. The dried solids are then packaged and managed in accordance with state and federal regulations. During the site visit, the inspection team noted an additional wastewater discharge while inspecting the pretreatment area. The facilitys chiller system had failed approximately 2 days before the visit. A number of the facilitys machines require water cooling to operate, and the facility was using once-through cooling water for that purpose. The facility was discharging the once-through cooling water (by means of a temporary hose) to the sewer system via the facilitys monitoring location. The Sorenson representatives had not notified the District of a change in the facilitys operations or this additional flow. The additional flow should be considered dilution. The inspection team was informed that this discharge practice is also implemented when the facility annually services the chiller. The District is required to review chiller servicing records for dates and time periods. This information should be evaluated against the self-monitoring data provided in the past to ensure that representative samples were collected for compliance purposes. The District is required to formally inform the facility of its permit violations (e.g., failing to report substantial operational changes, discharging dilution waters into a federal categorical monitoring location), as required by the Districts ERP. 8.4 Requesting, Receiving, and Analyzing Reports The federal pretreatment regulations at 40 CFR 403.8(f)(2)(iv) require the District to request, receive, and analyze all reports submitted by SIUs. The SIU reports must contain the information required at 40 CFR 403.12. The District is reminded that the pretreatment streamlining provisions have finalized the sampling requirements for all periodic reports required at 40 CFR 403.12(e) and (h). The District is required to ensure that all reports submitted by SIUs comply with the provisions of 40 CFR 403.12. The inspection team found that the District is adequately requesting, receiving, and analyzing reports submitted by its SIUs. The SMRs submitted by the SIUs have been updated to include additional information specified in the December 2005 audit and other information determined necessary by the District. 8.5 Slug Discharge Control Plans The federal pretreatment regulations at 40 CFR 403.8(f)(2)(vi) require the District to evaluate each SIU, by October 14, 2006, or within one year of becoming an SIU, to determine whether the SIU needs to develop and implement a slug discharge control plan. A slug discharge is any discharge of a nonroutine, episodic nature, including an accidental spill or noncustomary batch discharge [40 CFR 403.8(f)(2)(vi)]. The regulations also require an SIU to notify the POTW immediately of any changes at the facility affecting the potential for a slug discharge. The inspection team found that the District appears to be evaluating for the need for slug discharge control plans appropriately, but there is no documentation of the evaluations in the files of the three SIUs as required. The District is required to complete a new slug discharge evaluation with the required documentation. The inspection team recommends that the District add slug discharge evaluation language to its inspection forms to ensure that slug evaluations are well documented. 9. Enforcement The federal pretreatment regulations at 40 CFR 403.8(f)(5) require the District to develop and implement an ERP. This plan must contain detailed procedures indicating how the District will investigate and respond to instances of industrial user noncompliance. The District appears to be adequately implementing their ERP. The inspection team reminds the District of the pretreatment streamlining changes to the definition of SNC (see Section 5). The District is required to revise its ERP to reflect the changes to the SNC definition. 10. Summary of Requirements and Recommendations Listed below are the recommendations resulting from the inspection of the Districts pretreatment program. For more specific information pertaining to each comment, please refer to the cited sections of the report. Requirements A review of the Hoover Egg permitting process identified a delay in issuing the permit due to a disagreement regarding the associated wastewater user charges. The District is required to properly regulate all SIUs as defined at 40 CFR 403.3(v). The District is required by 40 CFR 403.8(f) to properly permit all industrial users. The Districts permitting process should not be delayed due to negotiations over wastewater user charges. If a facility fails to comply with the Districts permitting process, enforcement actions should be implemented as specified in the Districts ERP. The District is required to implement the appropriate changes to ensure that the permit is issued. (Section 7.1.1, Permitting Procedures) No permit should contain an effective date that predates the date of issuance. A permit may, however, be issued to go into effect at some future date (e.g., a permit issued on January 20 may go into effect on February 1 because the previous permit will not expire until January 31). As required at 40 CFR 403.8(f)(1)(iii)(B)(1), permits must contain a statement of duration, which should include an effective date and an expiration date. Permits should be issued prior to their effective dates so that permittees are aware of their limitations, obligations, and requirements before they are held responsible for upholding those permit conditions. The District is required to implement the appropriate changes to ensure that permits are properly dated. (Section 7.1.2, Permit Effective and Authorization Dates) The District is required to have Dentsply Ceramco remove all dilution streams from the categorical monitoring location, in accordance with its permit (Part 5 Standard Condition Number 10) and 40 CFR 433.15(c). The practice of allowing rinse water to run while no product is being processed should be cited as a dilution practice. The facility should be required to evaluate the rinse water needs associated with its product. The facility should not allow rinse flow rates that exceed the rate needed. In addition, the facility should be required to modify the bottom clean-out valve to eliminate the potential for accidental releases from the phosphate treatment rinse tank. (Section 8.3, Nondomestic Discharger Site Inspections Conducted During the Inspection) The District is required to review Sorenson Engineerings chiller servicing records for dates and time periods. This information should be evaluated against past and current self-monitoring data to ensure that representative samples were collected for compliance purposes. (Section 8.3, Nondomestic Discharger Site Inspections Conducted During the Inspection) The District is required to formally inform Sorenson Engineering of its permit violations (e.g., failing to report substantial operational changes, discharging dilution waters into a federal categorical monitoring location) as required by the Districts ERP. (Section 8.3, Nondomestic Discharger Site Inspections Conducted During the Inspection) The inspection team found that the District appears to be evaluating for the need for slug discharge control plans appropriately, but there is no documentation of the evaluations in the SIU files reviewed as required. The District is required to complete a new slug discharge evaluation with the required documentation. (Section 8.5, Slug Discharge Control Plan) Recommendations The FOG inspection program has been in place for approximately 6 or 7 months. The program has been designed so that every restaurant within the Districts jurisdiction will be inspected at least once a year. The pretreatment team is currently responsible for completing the inspections. This responsibility will be transferred to the sewer collection team in the near future, but no exact date was provided. The inspection team recommends that the Districts pretreatment program staff continue to work closely with the sewer collection team to ensure that all program requirements are met. (Section 3, Pretreatment Program Modifications) The inspection team found that the District appears to be evaluating for the need for slug discharge control plans appropriately, but there is no documentation of the evaluations in the files of the three SIUs as required. The team recommends that the District add slug discharge evaluation language to its inspection forms to ensure that slug evaluations are well documented. 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