SDAPCD RULE XI-E NATIONAL EMISSION STANDARD FOR MERCURY          
LAST REVISED 11/08/76

          
          SUBPART E - National Emission Standard for Mercury 
                      (Delegation Effective 11/8/76)


               RULE 361.50.   APPLICABILITY

               The provisions of this subpart are applicable to those
          stationary sources which process mercury ore to recover mercury,
          use mercury chlor-alkali cells to produce chlorine gas and alkali
          metal hydroxide, and incinerate or dry wastewater treatment plant
          sludge.  "New Sources" for this subpart are those sources
          commencing construction or modification after December 7, 1971.


               RULE 361.51.   DEFINITIONS

               Terms used in this subpart are defined in Subpart A of this
          regulation, of in this rule as follows:

               (a)  "Mercury" means the element mercury, excluding any
          associated elements, and includes mercury in particulates,
          vapors, aerosols, and compounds.

               (b)  "Mercury Ore" means a mineral mined specifically for
          its mercury content.

               (c)  "Mercury Ore Processing Facility" means a facility
          processing mercury ore to obtain mercury.

               (d)  "Condenser Stack Gases" means the gaseous effluent
          evolved from the stack of processes utilizing heat to extract
          mercury metal from mercury ore.

               (e)  "Mercury Chlor-Alkali Cell" means a device which is
          basically composed of an electrolyzer section and a denuder
          (decomposer) section and utilizes mercury to produce chlorine
          gas, hydrogen gas, and alkali metal hydroxide.

               (f)  "Mercury Chlor-Alkali Cell Electrolyzer" means an
          electrolytic device which is part of a mercury chlor-alkali cell
          and utilizes a flowing mercury cathode to produce chlorine gas
          and alkali metal amalgam.

               (g)  "Denuder" means a horizontal or vertical container
          which is part of a mercury chlor-alkali cell and in which water
          and alkali metal amalgam are converted to alkali metal hydroxide,
          mercury, and hydrogen gas in a short circuited, electrolytic
          reaction.

               (h)  "Hydrogen Gas Stream" means a hydrogen stream formed in
          the chlor-alkali cell denuder.

               (i)  "End Box" means a container(s) located on one or both
          ends of a mercury chlor-alkali electrolyzer which serves as a
          connection between the electrolyzer and denuder for rich and
          stripped amalgam.

               (j)  "End Box Ventilation System" means a ventilation system
          which collects mercury emissions from the end-boxes, the mercury
          pump sumps, and their water collection systems.

               (k)  "Cell Room" means a structure(s) housing one or more
          mercury electrolytic chlor-alkali cells.

               (l)  "Sludge" means sludge produced by a treatment plant
          that process municipal or industrial waste waters.

               (m)  "Sludge Dryer" means a device used to reduce the
          moisture content of sludge by heating to temperatures above 65C
          (ca. 150F) directly with combustion gases.


               RULE 361.52.   EMISSION STANDARD

               (a)  Emissions to the atmosphere from mercury ore processing
          facilities and mercury cell chlor-alkali plants shall not exceed
          2300 grams of mercury per 24-hour period.

               (b)  Emissions to the atmosphere from sludge incineration
          plants, sludge drying plants, or a combination of these that
          process wastewater treatment plant sludges shall not exceed 3200
          grams of mercury per 24-hour period.


               RULE 361.53.   STACK SAMPLING (Rev. Effective 3/27/90)

               (a)  Mercury ore processing facility.

                    (1)  Unless a waiver of emission testing is obtained
               under Rule 361.13, each owner or operator processing mercury
               ore shall test emissions from this source,

                         (i)  Within 90 days of the effective date in the
                    case of an existing source or a new source which has an
                    initial startup date preceding the effective date; or

                         (ii) Within 90 days of the startup in the case of
                    a new source which did not have an initial startup date
                    preceding the effective date.


                    (2)  The Control Officer shall be notified at least 30
               days prior to an emission test, so that he may at his option
               observe the test.

                    (3)  Samples shall be taken over such a period or
               periods as are necessary to accurately determine the maximum
               emissions which will occur in a 24-hour period.  No changes
               in the operation shall be made, which would potentially
               increase emissions above that determined by the most recent
               source test, until the new emission level has been estimated
               by calculation and the results reported to the Control
               Officer.

                    (4)  All samples shall be analyzed, and mercury
               emissions shall be determined within 30 days after the stack
               test.  Each determination shall be reported to the Control
               Officer by a registered letter dispatched within 15 calendar
               days following the date such determination is completed.

                    (5)  Records of emission test results and other data
               needed to determine total emissions shall be retained at the
               source and made available, for inspection by the Control
               Officer, for a minimum of 2 years.

               (b)  Mercury chlor-alkali plant--hydrogen and end-box
          ventilation gas streams.

                    (1)  Unless a waiver of emission testing is obtained
               under Rule 361.13, each owner or operator employing mercury
               chlor-alkali cell(s) shall test emissions from his source,

                         (i)  Within 90 days of the effective date in the
                    case of an existing source or a new source which has an
                    initial startup date preceding the effective date; or

                         (ii) Within 90 days of startup in the case of a
                    new source which did not have an initial startup date
                    preceding the effective date.

                    (2)  The Control Officer shall be notified at least 30
               days prior to an emission test, so that he may at his option
               observe the test.

                    (3)  Samples shall be taken over such a period or
               periods as are necessary to accurately determine the maximum
               emission which will occur in a 24-hour period.  No changes
               in the operation shall be made, which would potentially
               increase emissions above that determined by the most recent
               source test, until the new emission has been estimated by
               calculation and the results reported to the Control Officer.

                    (4)  All samples shall be analyzed, and mercury
               emissions shall be determined within 30 days after the stack
               test.  Each determination shall be reported to the Control
               Officer by a registered letter dispatched  within 15
               calendar days following the date such  determination is
               completed.

                    (5)  Records of emission test results and other data
               needed to determine total emissions shall be retained at the
               source and made available for inspection by the Control
               Officer, for a minimum of 2 years.

               (c)  Mercury chlor-alkali plants--cell room ventilation
          system.

                    (1)  Stationary sources using mercury chlor-alkali
               cells may test cell room emissions in accordance with
               Subsection (c)(2) of this rule or demonstrate compliance
               with Subsection (c)(4) of this rule and assume ventilation
               emissions of 1,300 gms/day of mercury.

                    (2)  Unless a waiver of emission testing is obtained
               under Rule 361.13, each owner or operator shall pass all
               cell room air in forced gas streams through stacks suitable
               for testing.

                         (i)  Within 90 days of the effective date in the
                    case of an existing source or a new source which has an
                    initial startup date preceding the effective date; or

                         (ii) Within 90 days of startup in the case of a
                    new source which did not have an initial startup date
                    preceding the effective date.

                    (3)  The Control Officer shall be notified at least 30
               days prior to an emission test, so that he may at his option
               observe the test.

                    (4)  An owner or operator may carry out approved
               design, maintenance, and housekeeping practices.  A list of
               approved practices is provided in Appendix A of "Review of
               National Emission Standards for Mercury", EPA-450/3-84-014a,
               December, 1984.  Copies are available from EPA's Central
               Docket Section.  Docket item number A-84-41, III-B-1.

               (d)  Sludge incineration and drying plants.

                    (1)  Unless a waiver of emission testing is obtained
               under Rule 361.13, each owner or operator of a source
               subject to the standard in Rule 361.52(b) shall test
               emissions from that source.  Such tests shall be conducted
               in accordance with the procedures set forth either in
               Section (d) of this rule or in Rule 361.54.

                    (2)  Method 101 in Appendix B to CFR Part 61 shall be
               used to test emissions as follows:

                         (i)  The test shall be performed within 90 days of
                    the effective date of these regulations in the case of
                    an existing source or a new source which has an initial
                    startup date preceding the effective date.

                         (ii) The test shall be performed within 90 days of
                    startup in the case of a new source which did not have
                    an initial startup date preceding the effective date.

                    (3)  The Control Officer shall be notified at least 30
               days prior to an emission test, so that he may at his option
               observe the test.

                    (4)  Samples shall be taken over such a period or
               periods as are necessary to determine accurately the maximum
               emissions which will occur in a 24-hour period.  No changes
               shall be made in the operation which would potentially
               increase emissions above the level determined by the most
               recent stack test, until the new emission level has been
               estimated by calculation and the results reported to the
               Control Officer.

                    (5)  All samples shall be analyzed, and mercury
               emissions shall be determined within 30 days after the stack
               test.  Each determination shall be reported to the Control
               Officer by a registered letter dispatched within 15 calendar
               days following the date such determination is completed.

                    (6)  Records of emission test results and other data
               needed to determine total emissions shall be retained at the
               source and shall be made available, for inspection by the
               Control Officer, for a minimum of 2 years.


               RULE 361.54.   SLUDGE SAMPLING (Rev. Effective 3/27/90)

               (a)  As an alternative means for demonstrating compliance
          with Rule 361.52(b), an owner or operator may use Method 105 of
          Appendix B to 40 CFR Part 61 and the procedures specified in this
          rule.

                    (1)  A sludge test shall be conducted within 90 days of
               the effective date of these regulations in the case of an
               existing source or a new source which has an initial startup
               date preceding the effective date; or

                    (2)  A sludge test shall be conducted within 90 days of
               startup in the case of a new source which did not have an
               initial startup date preceding the effective date.

               (b)  The Control Officer shall be notified at least 30 days
          prior to a sludge sampling test, so that he may at his option
          observe the test.

               (c)  Sludge shall be sampled according to Subsection (c)(1)
          of this rule, sludge charging rate for the plant shall be
          determined according to Subsection (c)(2) of this rule, and the
          sludge analysis shall be performed according to Subsection (c)(3)
          of this rule.

                    (1)  The sludge shall be sampled after dewatering and
               before incineration or drying, at a location that provides a
               representative sample of the sludge that is charged to the
               incinerator or dryer.  Eight consecutive grab samples shall
               be obtained at intervals of between 45 and 60 minutes and
               thoroughly mixed into one sample.  Each of the eight grab
               samples shall have a volume of at least 200 ml but not more
               than 400 ml.  A total of three composite samples shall be
               obtained within an operating period of 24 hours.  When the
               24-hour operating period is not continuous, the total
               sampling period shall not exceed 72 hours after the first
               grab sample is obtained.  Samples shall not be exposed to
               any condition that may result in mercury contamination or
               loss.

                    (2)  The maximum 24-hour period sludge incineration or
               drying rate shall be determined by use of a flow rate
               measurement device that can measure the mass rate of sludge
               charged to the incinerator or dryer with an accuracy of 5
               percent over its operating range.  Other methods of
               measuring sludge mass charging rates may be used if they
               have received prior approval by the Control Officer.

                    (3)  The handling, preparation, and analysis of sludge
               samples shall be accomplished according to Method 105 in
               Appendix B to 40 CFR Part 61.

               (d)  The mercury emissions shall be determined by use of the
          following equation:

                                   EHg = 1 x 10-3 cQ
               where

                    EHg = Mercury emissions, g/day

                    c   = Mercury concentration of sludge on a dry
                          solids basis, /g (ppm)

                    Q   = Sludge charging rate, kg/day

               (e)  No changes in the operation of a plant shall be made
          after a sludge test has been conducted which would potentially
          increase emissions above the level determined by the most recent
          sludge test, until the new emission level has been estimated by
          calculation and the results reported to the Control Officer.

               (f)  All sludge samples shall be analyzed for mercury
          content within 30 days after the sludge sample is collected.
          Each determination shall be reported to the Control Officer by a
          registered letter dispatched within 15 calendar days following
          the date such determination is completed.

               (g)  Records of sludge sampling, charging rate determination
          and other data needed to determine mercury content of wastewater
          treatment plant sludges shall be retained at the source and made
          available, for inspection by the Control Officer, for a minimum
          of 2 years.


               RULE 361.55.   MONITORING OF EMISSIONS AND OPERATIONS
                                        (Rev. Effective 3/27/90)

               (a)  Wastewater treatment plant sludge incineration and
          drying plants.  All the sources for which mercury emissions
          exceed 1600 g per 24-hour period, demonstrated either by stack
          sampling according to Rule 361.53 or sludge sampling according to
          Rule 361.54, shall monitor mercury emissions at intervals of at
          least once per year by use of Method 105 of Appendix B to 40 CFR
          Part 61, or the procedures specified in Rule 361.53(d)(2) and
          (4).  The results of monitoring shall be reported and retained
          according to Rules 361.53(d)(5) and (6) or 361.54(f) and (g).

               (b)  Mercury cell chlor-alkali plants - hydrogen and end-box
          ventilation gas streams.

                    (1)  The owner or operator of each mercury cell chlor-
               alkali plant shall, within 1-year of the date of publication
               of these amendments or within 1-year of startup for a plant
               with initial startup after the date of publication, perform
               a mercury emission test that demonstrates compliance with
               the emission limits in Rule 361.52, on the hydrogen stream
               by Reference Method 102 and on the end-box stream by
               Reference Method 101 for the purpose of establishing limits
               for parameters to be monitored.

                    (2)  During tests specified in Subsection (b)(1) of
               this rule, the following control device parameters shall be
               monitored, except as provided in Section (c) of this rule,
               and recorded manually or automatically at least once every
               15 minutes:

                         (i)  the exit gas temperature from uncontrolled
                    streams;

                         (ii) the outlet temperature of the gas stream for
                    the final (i.e., the farthest downstream) cooling
                    system when no control devices other than coolers and
                    demisters are used;

                         (iii)the outlet temperature of the gas stream from
                    the final cooling system when the cooling system is
                    followed by a molecular sieve or carbon adsorber;

                         (iv) outlet concentration of available chlorine,
                    pH, liquid flow rate, and inlet gas temperature of
                    chlorinated brine scrubbers and hypochloride scrubbers;

                         (v)  the liquid flow rate and exit gas temperature
                    for water scrubbers;

                         (vi) the inlet gas temperature of carbon
                    adsorption systems; and

                         (vii)the temperature during the heating phase of
                    the regeneration cycle for carbon adsorbers or
                    molecular sieves.

                    (3)  The recorded parameters in Subsections (b)(2)(i)
               through (b)(2)(vi) of this rule shall be averaged over the
               test period (a minimum of 6 hours) to provide an average
               number.  The highest temperature reading that is measured in
               Subsection (b)(2)(vii) of this rule is to be identified as
               the reference temperature for use in Subsection (b)(6)(ii)
               of this rule.

                    (4)  (i)  Immediately following completion of the
               emission tests specified in Subsection (b)(1) of this rule,
               the owner or operator of a mercury cell chlor-alkali plant
               shall monitor and record manually or automatically at least
               once per hour the same parameters specified in Subsections
               (b)(2)(i) through (b)(2)(vi) of this rule.

                         (ii) Immediately following completion of the
                    emission tests specified in Subsection (b)(1) of this
                    rule, the owner or operator shall monitor and record
                    manually or automatically, during each heating phase of
                    the regeneration cycle, the temperature specified in
                    Subsection (b)(2)(vii) of this rule.

                    (5)  Monitoring devices used in accordance with
               Subsections (b)(2) and (b)(4) of this rule shall be
               certified by their manufacturer to be accurate to within 10
               percent, and shall be operated, maintained, and calibrated
               according to the manufacturer's instructions.  Records of
               the certifications and calibrations shall be retained at the
               chlor-alkali plant and made available for inspection by the
               Control Officer as follows:  Certification, for as long as
               the device is used for this purpose; calibration for a
               minimum of 2 years.

                    (6)  (i)  When the hourly value of a parameter
               monitored in accordance with Sub-section (b)(4)(i) of this
               rule exceeds, or in the case of liquid flow rate and
               available chlorine falls below the value of that same
               parameter determined in Subsection (b)(2) of this rule for
               24 consecutive hours, the Control Officer is to be notified
               within the next 10 days.

                         (ii) When the maximum hourly value of the
                    temperature measured in accordance with Subsection
                    (b)(4)(ii) of this rule is below the reference
                    temperature recorded according to Subsection (b)(3) of
                    this rule for three consecutive regeneration cycles,
                    the Control Officer is to be notified within the next
                    10 days.

                    (7)  Semiannual reports shall be submitted to the
               Control Officer indicating the time and date on which the
               hourly value of each parameter monitored according to
               Subsections (b)(4)(i) and (b)(4)(ii) of this rule fell
               outside the value of that same parameter determined under
               Subsection (b)(3) of this rule; and corrective action taken,
               and the time and date of the corrective action.  Parameter
               excursions will be considered unacceptable operation and
               maintenance of the emission control system.  In addition,
               while compliance with the emission limits is determined
               primarily by conducting a performance test according to the
               procedures in Rule 361.53(b), reports of parameter
               excursions may be used as evidence in judging the duration
               of a violation that is determined by a performance test.

                    (8)  Semiannual reports required in Subsection (b)(7)
               of this rule shall be submitted to the Control Officer on
               September 15, and March 15, of each year.  The first
               semiannual report is to be submitted following the first
               full 6-month reporting period.  The semiannual report due on
               September 15 (March 15) shall exclude all excursions
               monitored through August 31 (February 28) of the same
               calendar year.

               (c)  As an alternative to the monitoring, recordkeeping, and
          reporting requirements in Subsections (b)(2) through (8) of this
          rule, an owner or operator may develop and submit for the Control
          Officer's review and approval a plant-specific monitoring plan.
          To be approved, such a plan must ensure not only compliance with
          the emission limits of Rule 361.52(a) but also proper operation
          and maintenance of emissions control systems.  Any site-specific
          monitoring plan submitted must, at a minimum, include the
          following:

                    (1)  Identification of the critical parameter or
               parameters for the hydrogen stream and for the end-box
               ventilation stream that are to be monitored and an
               explanation of why the critical parameter(s) selected is the
               best indicator of proper control system performance and of
               mercury emission rates.

                    (2)  Identification of the maximum or minimum value of
               each parameter (e.g., degrees temperature, concentration of
               mercury) that is not to be exceeded.  The level(s) is to be
               directly correlated to the results of a performance test,
               conducted no more than 180 days prior to submittal of the
               plan, when the facility was in compliance with the emission
               limits of Rule 361.52(a).

                    (3)  Designation of the frequency for recording the
               parameter measurements, with justification if the frequency
               is less than hourly.  A longer recording frequency must be
               justified on the basis of the amount of time that could
               elapse during periods of process control system upsets
               before the emission limits would be exceeded, and
               consideration is to be given to the time that would be
               necessary to repair the failure.

                    (4)  Designation of the immediate actions to be taken
               in the event of an excursion beyond the value of the
               parameter established in Paragraph 2.

                    (5)  Provisions for reporting, semiannually, parameter
               excursions and the corrective actions taken, and provisions
               for reporting within 10 days any significant excursion.

                    (6)  Identification of the accuracy of the monitoring
               device(s) or of the readings obtained.

                    (7)  Recordkeeping requirements for certifications and
               calibrations.

               (d)  Mercury cell chlor-alkali plants - cell room
          ventilation system.

                    (1)  Stationary sources determining cell room emissions
               in accordance with Rule 361.53(c)(4) shall maintain daily
               records of all leaks or spills of mercury.  The records
               shall indicate the amount, location, time, and date the
               leaks or spills occurred, identify the cause of the leak or
               spill, state the immediate steps taken to minimize mercury
               emissions and steps taken to prevent future occurrences, and
               provide the time and date on which corrective steps were
               taken.

                    (2)  The results of monitoring shall be recorded,
               retained at the source, and made available for inspection by
               the Administrator for a minimum of 2 years.



          NOTE:  DELEGATION OF AUTHORITY  (40 CFR Part 60)

               (a)  In delegating implementation and enforcement authority
          to a State under Section 112(d) of the Act, the authorities
          contained in paragraph (b) of this note shall be retained by the
          Administrator and not transferred to a State.

               (b)  Authorities which will not be delegated to States:
          Sections 61.53(c)(4) and 61.55(d).  The authorities not delegated
          to States listed are in addition to the authorities in the
          General Provisions, Subpart A of 40 CFR Part 61, that will not be
          delegated to States [61.04(b), 61.12(d)(1), and
          61.13(h)(1)(ii)].