SCAQMD RULE 2011-5 PROTOCOL FOR RULE 2011
REVISED 11/11/11

PROTOCOL FOR RULE 2011

CHAPTER 5

REMOTE TERMINAL UNIT (RTU) - ELECTRONIC REPORTING

TABLE OF CONTENTS

CHAPTER 5 - REMOTE TERMINAL UNIT (RTU)

A. General 2011A-5-1
B. Products 2011A-5-3
C. Execution 2011A-5-5
D. Data Requirements 2011A-5-11
Appendix G - (Diagrams) 2011A-5-16

This chapter defines the tasks and characteristics for electronic reporting of emissions from all sources. The Facility Permit holder of a major source shall use an RTU to telecommunicate rule compliance data to the District Central Station Emissions Monitoring Computer. The RTU shall collect data, perform calculations, generate the appropriate data files, and transmit the data to the Central Station. The Facility Permit holder of a process unit may elect to use an RTU. Alternatively, the Facility Permit holder of a process unit shall compile the required rule compliance data manually, and transmit that data via modem in accordance with the data requirements of Section D in this chapter.

A. GENERAL

  1. General
  2. The Facility Permit holder of a major source shall telecommunicate rule compliance data to the District via Remote Terminal Units (RTU). This form of reporting may also be used for process units. The RTU shall collect data from a CEMS, a CPMS, or other equipment specified in the Facility Permit and send data periodically to the Central Station Emissions Monitoring Computer (Central Station ).

    This chapter specifies the tasks and characteristics required of the RTU and shall be used as a guide for providing the required software/hardware for the RTU. Emissions Data Collection System conformity as well as establishing and maintaining communications with the emission monitoring system and the Central Station shall be the responsibility of the Facility Permit holder. This chapter also serves as a functional guideline for operating requirements of the RTU, and provides information concerning RTU hardware/software procurement, configuration, installation, maintenance, and compatibility with the emission monitoring system and the Central Station.

  3. RTU and Supporting Equipment Description
  4. a). Purpose:

    The RTU shall interface to existing data acquisition systems or other field instrumentation, and shall gather and store data, and facilitate telecommunication with the Central Station Computer.

    b). Environment:

    (i). Logical Environment:
    The signal chain includes the process equipment, sensing devices, data acquisition system, RTU, modem, communications link and District Central Station.

    (ii). Physical Environment:
    Typical environments shall include "friendly" and "Central Station" environments. Friendly environments include clean, air conditioned areas such as computer rooms and offices. Hostile environments may include exterior spaces or interior spaces without benefit of air conditioning, and areas where free floating air particulates may impede the normal operation of exposed electronics. Each RTU shall be mounted in such a manner as to be environmentally qualified.

    (iii). Electrical Environment:

  1. Connected Devices:
  2. Each RTU may receive information from a local computer (DAS) or various field sensing devices, calculate and/or store the specified parameters and shall make its data available to local and Central Stations.

  3. Sensor-based Data to be acquired:
  4. Where applicable, the RTU shall be able to directly monitor transducers which sense variables required for compliance determinations. At a minimum, input analog conversion hardware should operate with a medium level of resolution (i.e. 12 bit resolution) and a sampling rate sufficient to accurately characterize the sensor based data.

    (iv). Description of Data to be transmitted:

    All data shall be made available at data output ports in ASCII format as described below:

  5. Data Sampling:
  6. Shall retain selectable status levels about its sensors.

  7. Rule-specific Data Sets:
  8. (as specified elsewhere)

c). Functions:

The RTU shall provide the following functions:

    (i). Power-Up/Restart Mode:

    Upon resumption of power after a loss, the RTU shall automatically restart and reset itself to predetermined system settings.

    (ii). Non-Communicating Mode:

    When in the non-communicating mode the RTU shall operate independently of the communications ports as well as store its transactions for later communications with the Central Station.

    (iii). Failure Mode:

    In the event the RTU is unable to initiate communications with the Central Station, the RTU shall perform the following actions:

  1. The RTU shall first make four subsequent attempts to establish communications with the Central Station.
  2. Upon failure of the fourth attempt, the RTU shall:
  3. a). Revert to the noncommunicating mode for a period of fifteen (15) minutes and then again attempt to establish communications with the Central Station.

    b). Each failure shall result in the execution of the failure mode sequence.

  4. Error Tolerance:
  5. The RTU shall perform its specified functions without misinterpretation of input information, errors in output signals, damage to internal components, and loss or change of stored information with either common mode to ground or differential mode transients present on the communication ports, circuits or power sources which shall be connected to the inputs and power supply terminals to the equipment.

B. PRODUCTS

  1. RTU Attributes
  2. a). Environmental Tolerances: Each RTU shall be installed in such a manner as to be environmentally qualified for the particular physical environment.

    b). Communications Provisions: The RTU shall provide a minimum of one (1) communications connection. The connection shall be labeled "Remote".

    c). Real Time Clock: The RTU shall be equipped with a battery-backed Real Time Calendar/Clock (RTC) to provide time signals for implementing time dependent programs. The battery back-up shall be field replaceable and shall not require replacement more often than once every two (2) years. An alarm message shall be generated when the battery reaches a low voltage point with at least one (1) month life under load left prior to the necessity for battery replacement.

    d). Internal Software:

    (i). Data Collection and Storage: The RTU shall collect data from sensors, generate and store values, and perform calculations upon those values. Data shall be collected and stored in the Data Sampling memory.

    (ii). Calculations and Message Storage: Calculated values and messages resulting from calculations performed upon sampled data shall be stored as ASCII data strings in memory.

    e). Security Provisions:

    (i). Message Security: The RTU shall utilize a standard protocol encryption method for communications with the remote Central Station incorporating error detection. The system shall not incorporate error correction. The code shall detect one hundred (100) percent of single, double and triple errors; one hundred (100) percent of burst errors of six bits or fewer; ninety seven (97) percent of all seven-bit bursts; and ninety-eight point four (98.4) percent of all other burst as well as a substantial fraction of all random error patterns involving more than three (3) bits.

    (ii). Message Checking: The RTU shall utilize bitsum checking for all messages.

    f). Modem: Provide a modem connected to the Remote Central Station communication port.i. Modem Self-Test: The modem shall be capable of being operated in self testing mode automatically on a periodic basis.

    g). Transient Suppression: Provide hardware, circuitry, components or extended component ratings or characteristics necessary to prevent interference to correct operation or equipment damage from induced transients which may be presented on communication circuits and power sources. Transient suppression shall utilize the latest revision of the ANSI C37.90a standard.

C. EXECUTION

  1. General
  2. a). Section (C) describes acceptable methods and practices for use in completion of this work.

    b). Standards: Perform the work in accordance with the latest revisions of the following standards:

    (i). ANSI = American National Standards Institute.

    (ii). UL = Underwriters Laboratories.

    (iii). EIA = Electrical Industries Association.

    (iv). NEMA = National Electrical Manufacturers Association.

  3. Project Plan
  4. Develop a project plan for accomplishing the requirements of this installation. The plan shall include a checklist for the Submittal date.

  5. Software Requirements Guideline
  6. The Software Requirement Guideline (SRG) shall specify tasks and characteristics required of the RTU and is to be used as a guide for providing the required software for the RTU. Emissions Data Collection System conformity as well as establishing and maintaining communications with the emission monitoring system and the Central Station shall be the responsibility of the Facility Permit holder.

    a). References

    This guideline shall be used in conjunction with the following Rules:

    RULE 2011 - Requirements for Monitoring, Reporting and Recordkeeping for Oxides of Sulfur (SOx) Emissions

    RULE 2012 - Requirements for Monitoring, Reporting and Recordkeeping for Oxides of Nitrogen (NOx) Emissions

    b). System Relation

    The RTU shall be the local plant data storage and processing point in a system which is reporting data to a Central Station for evaluation to determine regulatory compliance. Data formats shall be standardized between the Central Station and all monitored emissions sources. It is the function of the RTU to convert as necessary the data stream from the local monitoring system. The fundamental operation of the RTU is to:

    (i). compile information from the emission monitoring system as specified in this guideline.

    (ii). transmit the compiled data to the Central Station on a scheduled basis.

    c). Central Station Interface

    On scheduled updates the RTU shall download current data to the Central Station. The RTU data buffer shall be reset after each successful download to the Central Station.

    d). Software Responsibility

    The Facility Permit holder shall be responsible for providing all RTU software required to perform all specified tasks. This may include purchased commercial software packages or custom written programs.

    e). Product Function

    (i). Software Context and Data Flow Diagrams

    The flow diagram at the end of this Chapter is a Context Diagram description and Data Flow Diagram which show how the different external functions tie to the RTU package. Plant data or operating information is collected by the emission monitoring system for evaluation of emissions. The RTU Unit is the process shown on this diagram and is the focus of this guideline.

    Data Values relating to emissions received from the emission monitoring system are processed by the RTU into data files for transmission to the SCAQMD Central Station. The type of message is shown on the RTU Context Diagram between the RTU and the Central Station. The message is data sets which are sent periodically.

    The RTU Data Flow Diagram is a graphical expansion of the RTU Unit process block. Emission monitoring system data is shown coming into the Network Driver and splitting to the other process blocks which represent RTU functions.

    (ii). Communication End Points

    The RTU will communicate with both the emission monitoring system and the Central Station. Each end point has a different protocol and purpose. Data sent from the RTU to the Central Station shall be converted from floating point numbers used to perform calculations into ASCII standard to allow for different internal formats.

    f). Specific Requirements

    (i). RTU Software

    The main RTU program shall receive input data, do calculations (if necessary) and store all data in non-volatile memory, as it is received.

    (ii). Direct Field Input Data

    Many RTUs may be capable of reading direct field inputs which shall consist of analog and/or digital real values. Direct field input requirements shall be specified as required for each RTU. Communications software shall be capable of supporting the hardware required to receive these inputs. If analog data cards must be installed in the RTU any resulting values provided to the RTU data bus shall range from -32768 to +32767 for unscaled values. The same accuracy as emission monitoring system network data shall be provided for analog data values scaled on the I/O device before going onto the RTU data bus.

    (iii). Input Data Conversion/Storage

    All input values shall be stored in as received ASCII format. These values shall then be parsed and converted to real numbers for calculations and averaging.

    (iv). Output Data To Central Station

    The context diagram displays how the RTU software shall be configured to allow messages to be sent to the Central Station. File transfer for all messages shall be in ASCII format including a bitsum check value with a return acknowledgment expected by the RTU when the Central Station has verified the bitsum check.

    (v). RTU To Central Station Communications Failure

    If the RTU cannot communicate with the Central Station the main program shall store all calculated values and reports in a special file in non-volatile memory. These special files shall be labeled to show that they have not been acknowledged as received by the Central Station.

    g). Performance Requirements

    (i). Speed of Receiving DATA

    Incoming data from the plant or emission monitoring system shall be received at intervals specified in the appropriate emission monitoring guideline. Communication with the Central Station, Parsing, verification, storage and checking shall not block the receipt of new data.

    (ii). RTU Non-Volatile Memory

    The RTU non-volatile memory shall have enough capacity to store all programs, data parameters, emission monitoring system input data and calculated data averages. Input data and calculated averages shall be allocated space using the first in first out (FIFO) method to store the quantity of data as required.

    h). Design Restraints

    (i). Data Set Formats

    Section (D) indicates the data format that is to be sent to the Central Station at scheduled intervals. The Central Station will send a confirmation message back for each transmission received which will consist of an identification number unique to the Central Station and a transaction number which is sequentially issued.

    i). RTU External Interface Requirements

    (i). Central Station Interface

    External interface to the RTU is shown on the Context Diagram at the end of this chapter. Central Station interface is described above as fixed format ASCII messages using a commercially available communication software package. In return the Central Station will send confirmation messages in ASCII form when a satisfactory message transfer has been completed.

  7. Required Installation Practices
  8. a). Standards: Install all devices in accordance with the standards set forth herein and in accordance with manufacturers recommendations and first class standard industry practice.

    b). Telephone Interface:

    RTU shall operate on a standard analog telephone line. Label the remote Central Station communications connector with the telephone number to which it is connected.

  9. Submittals
  10. a). Shop Drawing:

    (i). Submit two (2) copies of the following in accordance with the applicable rule compliance dates.

    o A Title Sheet

    o Single Line Diagrams

    o Wiring Diagrams or Run Sheets

    o Physical Details of Custom Assemblies

    (ii). Descriptions of the above shop drawings are as follows:

    a) Title Sheet containing a drawing list, abbreviations list, symbols list and schedules.

    b) Single-Line Diagram for each system showing signal relationships of devices within the system and device nomenclatures.

    c) Wiring Diagram for each assembly or enclosure or free standing device, showing the following:

    1. the layout of the devices within;
    2. wiring connections;
    3. wire numbers;
    4. voltage levels, and
    5. fuse values and types.

d). Physical Details of contractor fabricated assemblies:

  1. Provide an assembly drawing showing the finished product. Show components comprising the assembly by manufacturer and model number.
  2. Provide a schematic diagram of the assembly, as described above.

b). RTU Components List:

(i). The RTU Component List shall contain the following information for all materials, components, devices, wire and equipment used:

o Quantity for that system.

o Description (generic).

o Manufacturers Name and Model number.

c). Software Design Description (SDD). Indicate how the developed software will meet the defined software requirements. The SDD shall be based on ANSI/IEEE standards, specifically 1016 (SDD) and 730 (Quality Assurance).

d). Software Listing. Provide a source code listing of all developed software required by the applicable emission monitoring requirements.

D. DATA REQUIREMENTS

  1. General Requirements
  2. The District will accept data in the American Standard Code for Information Interchange (ASCII) format.

    The data file structure must be sequential. The record delimiter - a ~ (tilde) occurs only once following the end of each data record. There must be no delimiter before the first data record. The ASCII value for the delimiter is:

    ~ (decimal 126)

    Blank data records must not be reported

    In text fields, only upper case characters are to be used and must be left justified. Text fields that are not applicable must be filled with blanks. The ~ character (decimal 126) must never appear inside text fields.

    Numeric fields must be right justified and zero filled. Where decimal places are to be reported, they are to be implied - do not include the decimal point character. Numeric fields that are zeros or not applicable, must be zero filled.

    Date fields must be entered in the format "YYYYMMDD" and must always specify a valid date.

  3. Data File Description
  4. A properly composed data file is comprised of the following data records (shown indented to illustrate the logical grouping):

    Code 1A - Transmitter Record
    Code 1F - Facility Record
    Emission data record(s) from any of the following data records
    Code 1NP - NOx Process Unit and Large Source Record
    Code 1NM - NOx Major Source Record
    Code 1SP - SOx Process Unit Record
    Code 1SM - SOx Major Source Record
    Code 1FT - Facility Total Record
    Code 1F - Facility Record
    Emission data record(s)
    Code 1FT - Facility Total Record
    Code 1T - Final Total Record

    The Code 1A data record identifies the facility submitting the data file and must be the first data record in the data file.

    The Code 1T data record identifies the end of a data file and must be the last data record in the data file

    The Code 1F data record identifies the facility whose emission data records are being reported.

    The Code 1FT data record identifies the end of emission data records for a particular facility.

    Code 1F/1FT data records must not be nested inside of another 1F/1FT group and are repeated for each facility to be reported.

    Emission data records for a facility are reported following the Code 1F but before the 1FT data record for that facility and can comprise any of the following data record types:

    Code 1NP - NOx Process Unit and Large Source Record
    Code 1NM - NOx Major Source Record
    Code 1SP - SOx Process Unit Record
    Code 1SM - SOx Major Source Record

Code 1A - Transmitter Record

The Code 1A data record is used to identify the facility submitting the data file and must be the first data record reported.

Location Field Length Description
1-4 Record Identifier 4 Constant "1A" followed by 2 blanks.
5-10 SCAQMD Facility ID 6 Enter the 6-digit SCAQMD ID of the facility submitting the data file.

Code 1F - Facility Record

The Code 1F data record is used to identify the facility whose emissions are being reported.

Location Field Length Description
1-4 Record Identifier 4 Constant "1F" followed by 2 blanks.
5-10 SCAQMD Facility ID 6 Enter the 6-digit SCAQMD facility ID for the facility whose emissions are being reported.

Code 1FT - Facility Total Record

The Code 1FT data record is used to identify the end of data emission records for a facility.

Location Field Length Description
1-4 Record Identifier 4 Constant "1FT" followed by 1 blank.
5-11 Number of Emission Data Records 7 Enter the total number of emission Data Records reported for the facility (excluding the 1F and the 1FT data records). Right justify and zero fill.

Code 1T - Final Total Record

The Code 1T data record is used to identify the end of the data file and must be the last data record reported.

Location Field Length Description
1-4 Record Identifier 4 Constant "1T" followed by 2 blanks
5-11 Number of Data 7 Enter the total number of data records reported (including the Code 1T) in the data file. Right justify and zero fill.

Code 1NP - NOx Process Unit and Large Source Record

The Code 1NP data record is used to report NOx emissions from NOx Process Units and Large Sources.

Location Field Length Description
1-4 Record Identifier 4 Constant "1NP" followed by 1 blank
5-10 SCAQMD Permit Number 6 Enter the SCAQMD permit number for the equipment source. Left justify and fill with blanks
11-18 Date Emitted 8 Enter the date emitted in the format "YYYYMMDD"
19-27 Total Emission 9 (######.##) Enter the total emission in lb to 2 decimal places. Omit the decimal point, right justify and zero fill. No negative numbers.

Code 1NM - NOx Major Source Record

The Code 1NM data record is used to report NOx emissions from Major NOx sources.

Location Field Length Description
1-4 Record Identifier 4 Constant "1NM" followed by 1 blank
5-10 SCAQMD Permit Number 6 Enter the SCAQMD permit number for the equipment source. Left justify and fill with blanks.
11-18 Date Emitted 8 Enter the date emitted in the format "YYYYMMDD"
19-27 Total Emissions 9(#####.##) Enter the total emissions in lb to 2 decimal places. Omit the decimal point, right justify and zero fill. No negative numbers.
28-33 Status Word 6 Enter the six character status word for this hour from the Status Word Table.

Code 1SP - SOx Process Unit Record

The Code 1SP data record is used to report SOx emissions from SOx Process Units.

Location Field Length Description
1-4 Record Identifier 4 Constant "1SP" followed by 1 blank
5-10 SCAQMD Permit 6 Enter the SCAQMD permit number for the Number equipment source. Left justify and fill with blanks.
11-18 Date Emitted 8 Enter the date emitted in the format "YYYYMMDD"
19-27 Total Emission 9 (######.##) Enter the total emission in lb to 2 decimal places. Omit the decimal point, right justify and zero fill. No negative numbers.

Code 1SM - SOx Major Source Record

The Code 1SM data record is used to report SOx emissions from Major SOx sources.

Location Field Length Description
1-4 Record Identifier 4 Constant "1SM" followed by 1 blank
5-10 SCAQMD Permit Number 6 Enter the SCAQMD permit number for the equipment source. Left justify and fill with blanks.
11-18 Date Emitted 8 Enter the date emitted in the format "YYYYMMDD"
19-27 Total Emissions 9 (#####.##) Enter the total emissions in lb to 2 decimal places. Omit the decimal point, right justify and zero fill. No negative numbers.
28-33 Status Word 6 Enter the six character status word for this hour from the Status Word Table

Status Word Table

The Status Word Table is used to compile the status word for the required reporting period. True is 1 and False is 0.

Location Field Length Description
1-1 Valid Data 1 Enter true if valid data was obtained for the entire reporting period, else enter false
2-2 Calibration 1 Enter true if the monitoring system wascalibrated during the reporting period, else enter false
3-3 Off-line 1 Enter true if the monitoring system was off-line at any time during the reporting period, else enter false.
4-4 Alternate Data Acquisition 1 Enter true if alternate data acquisition was used during the reporting period, else enter false.
5-5 Out of Control 1 Enter true if the CEMS was out of control during the reporting period, else enter false
6-6 Fuel Switch 1 Enter true if more than one fuel type was used during the reporting period, else enter false.


APPENDIX G
DIAGRAMS

RTU Context Diagram

RTU Data Flow Diagram

Note: unable to provide graphics, please contact the District for a copy.


SCAQMD RULE 2011-5 REMOTE TERMINAL UNIT - ELEC. REPORTING
LAST REVISED 11/11/11







         C H A P T E R   5



         R E M O T E   T E R M I N A L   U N I T   ( R T U )

         -  E L E C T R O N I C   R E P O R T I N G


                                  TABLE OF CONTENTS


             CHAPTER 5 - REMOTE TERMINAL UNIT (RTU)

             A. General................................................55
             B. Products...............................................57
             C. Execution..............................................59
             D. Data Requirements......................................65
             Appendix G - (Diagrams)...................................70



             Rule 2011
             October 15, 1993



  PROTOCOL FOR RULE 2011


             This  chapter  defines  the  tasks  and  characteristics for
             electronic  reporting  of emissions from all  sources.   The
             Facility Permit holder of a major source shall use an RTU to
             telecommunicate rule compliance data to the District Central
             Station  Emissions  Monitoring   Computer.   The  RTU  shall
             collect data, perform calculations, generate the appropriate
             data files, and transmit the data  to  the  Central Station.
             The Facility Permit holder of a process unit  may  elect  to
             use  an RTU.  Alternatively, the Facility Permit holder of a
             process unit shall compile the required rule compliance data
             manually,  and  transmit  that  data via modem in accordance
             with the data requirements of Section D in this chapter.


             A.   GENERAL

                  1.   General

                       The Facility Permit holder of a major source shall
                       telecommunicate  rule  compliance   data   to  the
                       District  via  Remote  Terminal Units (RTU).  This
                       form of reporting may also  be  used  for  process
                       units.  The RTU shall collect data from a CEMS,  a
                       CPMS, or other equipment specified in the Facility
                       Permit  and  send data periodically to the Central
                       Station  Emissions  Monitoring  Computer  (Central
                       Station ).

                       This   chapter    specifies    the    tasks    and
                       characteristics  required  of the RTU and shall be
                       used  as  a  guide  for  providing   the  required
                       software/hardware  for  the  RTU.  Emissions  Data
                       Collection   System   conformity   as    well   as
                       establishing  and maintaining communications  with
                       the emission monitoring  system  and  the  Central
                       Station   shall   be  the  responsibility  of  the
                       Facility Permit holder.   This chapter also serves
                       as   a   functional   guideline   for    operating
                       requirements  of the RTU, and provides information
                       concerning  RTU   hardware/software   procurement,
                       configuration,   installation,  maintenance,   and
                       compatibility with  the emission monitoring system
                       and the Central Station.

                  2.   RTU and Supporting Equipment Description

                       a.   Purpose:

                            The  RTU  shall interface  to  existing  data
                            acquisition    systems    or    other   field
                            instrumentation, and shall gather  and  store
                            data,  and  facilitate telecommunication with
                            the Central Station Computer.

                       b.   Environment:

                            i.   Logical Environment:
                                 The signal  chain  includes  the process
                                 equipment,    sensing    devices,   data
                                 acquisition    system,    RTU,    modem,
                                 communications link and District Central
                                 Station.

                            ii.  Physical Environment:
                                 Typical   environments   shall   include
                                 "friendly"    and    "Central   Station"
                                 environments.    Friendly   environments
                                 include  clean,  air  conditioned  areas
                                 such  as  computer  rooms  and  offices.
                                 Hostile   environments    may    include
                                 exterior   spaces   or  interior  spaces
                                 without benefit of air conditioning, and
                                 areas    where    free   floating    air
                                 particulates  may  impede   the   normal
                                 operation of exposed electronics.   Each
                                 RTU shall be mounted in such a manner as
                                 to be environmentally qualified.


                            iii. Electrical Environment:
                                 1)   Connected Devices:
                                      Each  RTU  may  receive information
                                      from  a  local  computer  (DAS)  or
                                      various   field  sensing   devices,
                                      calculate    and/or    store    the
                                      specified parameters and shall make
                                      its  data available  to  local  and
                                      Central Stations.

                                 2)   Sensor-based Data to be acquired:
                                      Where  applicable, the RTU shall be
                                                able  to directly monitor
                                                transducers  which  sense
                                                variables   required  for
                                                compliance
                                                determinations.    At   a
                                                minimum,   input   analog
                                                conversion       hardware
                                                should  operate  with   a
                                                medium      level      of
                                                resolution  (i.e.  12 bit
                                                resolution)     and     a
                                                sampling  rate sufficient
                                                to             accurately
                                                characterize  the  sensor
                                                based data.

                            iv.  Description of Data to be transmitted:
                                 All data shall be made available at data
                                 output   ports   in   ASCII   format  as
                                 described below:
                                 1)   Data Sampling:
                                      Shall   retain   selectable  status
                                      levels about its sensors.
                                 2)   Rule-specific Data Sets:
             (as specified elsewhere)
                       c.   Functions:

                            The   RTU   shall   provide   the   following
                            functions:

                            i.   Power-Up/Restart Mode:
                                 Upon  resumption of power after a  loss,
                                 the RTU  shall automatically restart and
                                 reset  itself  to  predetermined  system
                                 settings.

                            ii.  Non-Communicating Mode:
                                 When in  the  non-communicating mode the
                                 RTU shall operate  independently  of the
                                 communications  ports  as  well as store
                                 its      transactions      for     later
                                 communications with the Central Station.

                            iii. Failure Mode:
                                 In  the  event  the  RTU  is  unable  to
                                 initiate communications with the Central
                                 Station,  the  RTU  shall  perform   the
                                 following actions:

                                 1)   The   RTU  shall  first  make  four
                                      subsequent  attempts  to  establish
                                      communications   with  the  Central
                                      Station.

                                 2)   Upon failure of the fourth attempt,
                                      the RTU shall:
                                      a.   Revert          to         the
                                           non-communicating  mode  for a
                                           period of fifteen (15) minutes
                                           and   then  again  attempt  to
                                           establish  communications with
                                           the Central Station.
                                      b.   Each failure  shall  result in
                                           the  execution  of the failure
                                           mode sequence.

                                 3)   Error Tolerance:

             "The RTU shall perform its specified functions without
             misinterpretation of input information, errors in output
             signals, damage to internal components, and loss or change
             of stored information with either common mode to ground or
             differential mode transients present on the communication
             ports, circuits or power sources which shall be connected to
             the inputs and power supply terminals to the equipment."

             B.   PRODUCTS

                  1.   RTU Attributes

                       a.   Environmental Tolerances:  Each  RTU shall be
                            installed   in   such   a  manner  as  to  be
                            environmentally qualified  for the particular
                            physical environment.



                       b.   Communications  Provisions:   The  RTU  shall
                            provide a minimum  of  one (1) communications
                            connection.  The connection  shall be labeled
                            "Remote".

                            .

                       c.   Real Time Clock:  The RTU shall  be  equipped
                            with     a     battery-backed    Real    Time
                            Calendar/Clock (RTC)  to provide time signals
                            for  implementing  time  dependent  programs.
                            The   battery   back-up   shall    be   field
                            replaceable and shall not require replacement
                            more often than once every two (2) years.  An
                            alarm  message  shall  be generated when  the
                            battery reaches a low voltage  point  with at
                            least  one  (1)  month  life  under load left
                            prior    to   the   necessity   for   battery
                            replacement.

                       d.   Internal Software:

                            i.   Data  Collection  and  Storage:  The RTU
                                 shall   collect   data   from   sensors,
                                 generate and store values,  and  perform
                                 calculations  upon  those  values.  Data
                                 shall  be  collected and stored  in  the
                                 Data Sampling memory.

                            ii.  Calculations    and   Message   Storage:
                                 Calculated values and messages resulting
                                 from calculations performed upon sampled
                                 data  shall  be  stored  as  ASCII  data
                                 strings in memory.

                       e.   Security Provisions:

                            i.   Message Security:  The RTU shall utilize
                                 a  standard protocol  encryption  method
                                 for   communications   with  the  remote
                                 Central   Station  incorporating   error
                                 detection.    The   system   shall   not
                                 incorporate  error correction.  The code
                                 shall detect one  hundred  (100) percent
                                 of single, double and triple errors; one
                                 hundred (100) percent of burst errors of
                                 six  bits  or fewer; ninety- seven  (97)
                                 percent  of all  seven-bit  bursts;  and
                                 ninety-eight  point  four (98.4) percent
                                 of  all  other  burst  as   well   as  a
                                 substantial fraction of all random error
                                 patterns  involving  more than three (3)
                                 bits.

                            ii.  Message Checking:  The RTU shall utilize
                                 bitsum checking for all messages.

                       f.   Modem:   Provide  a  modem connected  to  the
                            Remote Central Station  communication port.i.
                            Modem Self-Test:  The modem  shall be capable
                            of  being  operated  in  self  testing   mode
                            automatically on a periodic basis.

                       g.   Transient   Suppression:   Provide  hardware,
                            circuitry, components  or  extended component
                            ratings   or  characteristics  necessary   to
                            prevent interference  to correct operation or
                            equipment  damage  from  induced   transients
                            which   may  be  presented  on  communication
                            circuits   and   power   sources.   Transient
                            suppression shall utilize the latest revision
                            of the ANSI C37.90a standard.


             C.   EXECUTION

                  1.   General

                       a.   Section (C) describes acceptable  methods and
                            practices for use in completion of this work.

                       b.   Standards:   Perform  the  work in accordance
                            with  the latest revisions of  the  following
                            standards:

                            i.   ANSI      American   National  Standards
                                 Institute.

                            ii.  UL        Underwriters Laboratories.

                            iii. EIA       Electrical          Industries
                                 Association.

                            iv.  NEMA National  Electrical  Manufacturers
                                           Association.

                  2.   Project Plan

                       Develop  a  project  plan  for  accomplishing  the
                       requirements of this installation.  The plan shall
                       include a checklist for the Submittal date.

                  3.   Software Requirements Guideline

                       The  Software  Requirement  Guideline (SRG)  shall
                       specify tasks and characteristics  required of the
                       RTU and is to be used as a guide for providing the
                       required  software  for  the RTU.  Emissions  Data
                       Collection   System   conformity    as   well   as
                       establishing  and maintaining communications  with
                       the emission monitoring  system  and  the  Central
                       Station   shall   be  the  responsibility  of  the
                       Facility Permit holder.

                       a.   References

                            This guideline  shall  be used in conjunction
                            with the following Rules:

                            RULE  2011  -  Requirements  for  Monitoring,
                            Reporting  and Recordkeeping  for  Oxides  of
                            Sulfur (SOx) Emissions

                            RULE  2012  -  Requirements  for  Monitoring,
                            Reporting and  Recordkeeping  for  Oxides  of
                            Nitrogen (NOx) Emissions

                       b.   System Relation

                            The RTU shall be the local plant data storage
                            and  processing  point  in  a system which is
                            reporting  data  to  a  Central  Station  for
                            evaluation     to     determine    regulatory
                            compliance.     Data   formats    shall    be
                            standardized between  the Central Station and
                            all monitored emissions  sources.   It is the
                            function  of  the RTU to convert as necessary
                            the data stream  from  the  local  monitoring
                            system.  The fundamental operation of the RTU
                            is to:

                            i.   compile  information  from  the emission
                                 monitoring system as specified  in  this
                                 guideline.

                            ii.  transmit   the   compiled  data  to  the
                                 Central Station on a scheduled basis.

                       c.   Central Station Interface

                            On scheduled updates the  RTU  shall download
                            current data to the Central Station.  The RTU
                            data   buffer  shall  be  reset  after   each
                            successful download to the Central Station.

                       d.   Software Responsibility

                            The   Facility   Permit   holder   shall   be
                            responsible  for  providing  all RTU software
                            required  to  perform  all  specified  tasks.
                            This   may   include   purchased   commercial
                            software packages or custom written programs.

                       e.   Product Function

                            i.   Software Context and Data Flow Diagrams

                                 The  flow  diagram  at  the end of  this
                                 Chapter is a Context Diagram description
                                 and Data Flow Diagram which show how the
                                 different external functions  tie to the
                                 RTU  package.  Plant  data  or operating
                                 information is collected by the emission
                                 monitoring  system  for  evaluation   of
                                 emissions.   The RTU Unit is the process
                                 shown on this  diagram  and is the focus
                                 of this guideline.

                                 Data   Values   relating   to  emissions
                                 received  from  the  emission monitoring
                                 system  are processed by  the  RTU  into
                                 data  files   for  transmission  to  the
                                 SCAQMD Central  Station.   The  type  of
                                 message  is  shown  on  the  RTU Context
                                 Diagram between the RTU and the  Central
                                 Station.  The message is data sets which
                                 are sent periodically.

                                 The RTU Data Flow Diagram is a graphical
                                 expansion of the RTU Unit process block.
                                 Emission monitoring system data is shown
                                 coming   into  the  Network  Driver  and
                                 splitting  to  the  other process blocks
                                 which represent RTU functions.

                            ii.  Communication End Points

                                 The RTU will communicate  with  both the
                                 emission  monitoring  system   and   the
                                 Central  Station.   Each end point has a
                                 different  protocol  and  purpose.  Data
                                 sent from the RTU to the Central Station
                                 shall be converted from  floating  point
                                 numbers  used  to  perform  calculations
                                 into   ASCII   standard  to  allow   for
                                 different internal formats.

                       f.   Specific Requirements

                            i.   RTU Software

                                 The main RTU program shall receive input
                                 data, do calculations (if necessary) and
                                 store all data in  non-volatile  memory,
                                 as it is  received.

                                 ii.  Direct Field Input Data

                                 Many  RTUs  may  be  capable  of reading
                                 direct field inputs which shall  consist
                                 of  analog  and/or  digital real values.
                                 Direct field input requirements shall be
                                 specified  as  required  for  each  RTU.
                                 Communications software shall be capable
                                 of supporting the  hardware  required to
                                 receive  these  inputs.  If analog  data
                                 cards must be installed  in  the RTU any
                                 resulting   values provided to  the  RTU
                                 data  bus shall  range  from  -32768  to
                                 +32767  for  unscaled  values.  The same
                                 accuracy  as emission monitoring  system
                                 network  data   shall  be  provided  for
                                 analog data values  scaled  on  the  I/O
                                 device  before  going  onto the RTU data
                                 bus.

                            iii. Input Data Conversion/Storage

                                 All input values shall be  stored  in as
                                 received  ASCII  format.   These  values
                                 shall  then  be parsed and converted  to
                                 real   numbers  for   calculations   and
                                 averaging.

                            iv.  Output Data To Central Station

                                 The context diagram displays how the RTU
                                 software  shall  be  configured to allow
                                 messages  to  be  sent  to  the  Central
                                 Station.  File transfer for all messages
                                 shall  be  in ASCII format  including  a
                                 bitsum  check   value   with   a  return
                                 acknowledgment expected by the RTU  when
                                 the  Central  Station  has  verified the
                                 bitsum check.

                            v.   RTU  To  Central  Station Communications
                                 Failure

                                 If the RTU cannot communicate  with  the
                                 Central  Station  the main program shall
                                 store all calculated  values and reports
                                 in   a   special  file  in  non-volatile
                                 memory.  These  special  files  shall be
                                 labeled to show that they have not  been
                                 acknowledged  as received by the Central
                                 Station.

                       g.   Performance Requirements

                            i.   Speed of Receiving DATA

                                 Incoming data from the plant or emission
                                 monitoring system  shall  be received at
                                 intervals  specified in the  appropriate
                                 emission      monitoring      guideline.
                                 Communication with  the Central Station,
                                 Parsing,   verification,   storage   and
                                 checking shall  not block the receipt of
                                 new data.

                            ii.  RTU Non-Volatile Memory

                                 The RTU non-volatile  memory  shall have
                                 enough  capacity  to store all programs,
                                 data  parameters,  emission   monitoring
                                 system  input  data and calculated  data
                                 averages.   Input  data  and  calculated
                                 averages shall  be allocated space using
                                 the first in first  out (FIFO) method to
                                 store the quantity of data as required.

                       h.   Design Restraints

                            i.   Data Set Formats

                                 Section (D) indicates  the  data  format
                                 that  is  to  be  sent  to  the  Central
                                 Station  at  scheduled  intervals.   The
                                 Central Station will send a confirmation
                                 message   back   for  each  transmission
                                 received  which  will   consist   of  an
                                 identification   number  unique  to  the
                                 Central Station and a transaction number
                                 which is sequentially issued.

                       i.   RTU External Interface Requirements

                            i.   Central Station Interface

                                 External interface  to  the RTU is shown
                                 on  the Context Diagram at  the  end  of
                                 this  chapter. Central Station interface
                                 is described above as fixed format ASCII
                                 messages  using a commercially available
                                 communication   software   package.   In
                                 return  the  Central  Station will  send
                                 confirmation messages in ASCII form when
                                 a satisfactory message transfer has been
                                 completed.

                  4.   Required Installation Practices

                       a.   Standards:  Install all devices in accordance
                            with the standards set forth  herein  and  in
                            accordance with manufacturers recommendations
                            and first class standard industry practice.

                       b.   Telephone Interface:

                            RTU   shall  operate  on  a  standard  analog
                            telephone  line.   Label  the  remote Central
                            Station  communications  connector  with  the
                            telephone number to which it is connected.


                  5.   Submittals

                       a.   Shop Drawing:

                            i.   Submit two (2) copies  of  the following
                                 in  accordance with the applicable  rule
                                 compliance dates.

                                 o    A Title Sheet

                                 o    Single Line Diagrams

                                 o    Wiring Diagrams or Run Sheets

                                 o    Physical    Details    of    Custom
                                      Assemblies

                            ii.  Descriptions  of the above shop drawings
                                 are as follows:

                                 a)   Title Sheet  containing  a  drawing
                                      list,  abbreviations  list, symbols
                                      list and schedules.

                                 b)   Single-Line Diagram for each system
                                      showing  signal  relationships   of
                                      devices   within   the  system  and
                                      device nomenclatures.

                                 c)   Wiring Diagram for each assembly or
                                      enclosure or free standing  device,
                                      showing the following:

                                      1)   the   layout  of  the  devices
                                      within;

                                      2)   wiring connections;

                                      3)   wire numbers;

                                      4)   voltage levels, and

                                      5)   fuse values and types.

                                 d).  Physical  Details   of   contractor
                                      fabricated assemblies:

                                      1)   Provide  an  assembly  drawing
                                           showing  the finished product.
                                           Show components comprising the
                                           assembly by  manufacturer  and
                                           model number.

                                      2)   Provide a schematic diagram of
                                           the   assembly,  as  described
                                           above.

                       b.   RTU Components List:

                            i.   The RTU Component List shall contain the
                                 following information for all materials,
                                 components, devices,  wire and equipment
                                 used:

                                 o  Quantity for that system.

                                 o  Description (generic).

                                 o  Manufacturers Name and Model number.

                       c.   Software Design Description  (SDD).  Indicate
                            how  the  developed  software will  meet  the
                            defined software requirements.  The SDD shall
                            be based on ANSI/IEEE standards, specifically
                            1016 (SDD) and 730 (Quality Assurance).

                       d.   Software  Listing.   Provide  a  source  code
                            listing of all developed software required by
                            the     applicable    emission     monitoring
                            requirements.


             D.   DATA REQUIREMENTS

                  1.   General Requirements

                       ù    The District will accept data in the American
                            Standard  Code  for  Information  Interchange
                            (ASCII) format.

                       ù    The  data  file structure must be sequential.
                            The record delimiter  -  a  ~  (tilde) occurs
                            only  once  following  the  end of each  data
                            record.   There  must be no delimiter  before
                            the first data record.   The  ASCII value for
                            the delimiter is:

                                 ~ (decimal 126)

                       ù    Blank data records must not be reported

                       ù    In  text  fields, only upper case  characters
                            are to be used  and  must  be left justified.
                            Text fields that are not applicable  must  be
                            filled with blanks.  The ~ character (decimal
                            126) must never appear inside text fields.

                       ù    Numeric  fields  must  be right justified and
                            zero filled.  Where decimal  places are to be
                            reported,  they are to be implied  -  do  not
                            include the decimal point character.  Numeric
                            fields that are zeros or not applicable, must
                            be zero filled.

                       ù    Date fields  must  be  entered  in the format
                            "YYYYMMDD"  and must always specify  a  valid
                            date.

                  2.   Data File Description

                       A properly composed  data file is comprised of the
                       following data                     records  (shown
                       indented to illustrate the logical grouping):

                            Code 1A- Transmitter Record
                            Code 1F- Facility Record
                                           Emission  data  record(s) from
                                           any  of  the  following   data
                                           records
                            Code  1NP-  NOx Process Unit and Large Source
                                      Record
                            Code 1NM- NOx Major  Source Record
                            Code 1SP- SOx Process Unit Record
                            Code 1SM- SOx Major Source Record
                            Code 1FT- Facility Total Record
                            Code 1F- Facility Record
                                           Emission data record(s)
                                           .
                                           .
                                           .
                            Code 1FT- Facility Total Record
                            Code 1T- Final Total Record


                            The  Code  1A  data   record  identifies  the
                            facility submitting the data file and must be
                            the first data record in the data file.

                            The Code 1T data record identifies the end of
                            a data file and must be  the last data record
                            in the data file

                            The  Code  1F  data  record  identifies   the
                            facility  whose  emission  data  records  are
                            being reported.

                            The  Code  1FT data record identifies the end
                            of emission  data  records  for  a particular
                            facility.

                            Code 1F/1FT data records must not  be  nested
                            inside   of  another  1F/1FT  group  and  are
                            repeated for each facility to be reported.

                            Emission data  records  for  a  facility  are
                            reported following the Code 1F but before the
                            1FT  data  record  for  that facility and can
                            comprise  any  of the following  data  record
                            types:

                                 Code 1NP- NOx Process Unit and Large
                                                Source Record
                                 Code 1NM- NOx Major Source Record
                                 Code 1SP- SOx Process Unit Record
                                 Code 1SM- SOx Major Source Record





  PROTOCOL FOR RULE 2011



             Code 1A - Transmitter Record


             The Code 1A data record is used to identify the facility 
             submitting the data file and must be the first data record 
             reported.

             Location    |Field             |Length  | Description
               1-4       |Record Identifier |4       | Constant "1A" followed by
                                                       2 blanks.
               5-10      |SCAQMD Facility ID|6       | Enter the 6-digit 
                                                       SCAQMD facility ID of 
                                                       the facility submitting
                                                       the data file.


             Code 1F - Facility Record

             The Code 1F data record is used to identify the facility whose
             emissions are being reported.

             Location    |Field             |Length  | Description
               1-4Record Identifier|4       |Constant "1F" followed by 2 blanks.
               5-10      |SCAQMD Facility ID|6       | Enter the 6-digit 
                                                       SCAQMD facility ID for 
                                                       the facility whose 
                                                       emissions are being
                                                       reported.


             Code 1FT - Facility Total Record

             The Code 1FT data record is used to identify the end of data
             emission records for a facility.

             Location    |Field             |Length  | Description
               1-4       |Record Identifier |4       | Constant "1FT" followed
                                                          by 1 blank.
               5-11      |Number of Emission|7       | Enter the total number 
                                                       of emission data 
                                                       records reported for 
                                                       the facility Data 
                                                       Records (excluding the 
                                                       1F and the 1FT data
                                                       records).  Right 
                                                       justify and zero fill.


             Code 1T - Final Total Record

             The Code 1T data record is used to identify the end of the data
             file and must be the last data record reported.

             Location    |Field             |Length  | Description
             1-4         |Record Identifier |4       | Constant "1T" followed 
                                                       by 2 blanks
             5-11        |Number of Data    |7       | Enter the total number 
                                                       of data records 
                                                       reported (including 
                                                       the Code 1T) in the
                                                       data file.  Right 
                                                       justify and zero fill.







             Code 1NP - NOx Process Unit and Large Source Record


             The Code 1NP data record is used to report NOx emissions from NOx
             Process Units and Large Sources.

             Location   |Field             |Length         |Description
                 1-4    |Record Identifier |4              |Constant "1NP"
                                                            followed by 1 
                                                            blank
                 5-10   |SCAQMD Permit     |6              |Enter the SCAQMD
             permit number for the equipment source.  Left
             Number
             justify and fill with blanks

                11-18   |Date Emitted      |8              |Enter the date
             emitted in the format "YYYYMMDD"

                19-27   |Total Emission    |9 (######.##)  |Enter the total
                                                            emission in lb to 
                                                            2 decimal places.  
                                                            Omit the decimal
                                                            point, right 
                                                            justify and zero 
                                                            fill.  No 
                                                            negative numbers.


             Code 1NM - NOx Major Source Record

             The Code 1NM data record is used to report NOx emissions from 
             Major NOx sources.

             Location   |Field             |Length         |Description
                 1-4    |Record Identifier |4              |Constant "1NM"
                                                           followed by 1 blank
                 5-10   |SCAQMD Permit     |6              |Enter the SCAQMD
                                                           permit number
                                                           for the
             Number                                        equipment source.
             Left justify and fill with blanks.
                11-18   |Date Emitted      |8              |Enter the date
                                           emitted in the format "YYYYMMDD"
                19-27   |Total Emissions   |9 (#####.##)   |Enter the total
                                                            emissions in lb 
                                                            to 2 decimal 
                                                            places.  Omit the 
                                                            decimal point, 
                                                            right justify and 
                                                            zero fill.  No 
                                                            negative numbers.
                28-33   |Status Word       |6              |Enter the six 
                                                            character status 
                                                            word for this 
                                                            hour from the 
                                                            Status Word Table.


             Code 1SP - SOx Process Unit Record

             The Code 1SP data record is used to report SOx emissions from SOx
             Process Units.

             Location   |Field             |Length         |Description
                 1-4    |Record Identifier |4              |Constant "1SP"
                                                           followed by 1 blank
                 5-10   |SCAQMD Permit     |6              |Enter the SCAQMD
                                                           permit number for 
                                                           the Number 
                                                           equipment source.
                                                           Left justify and 
                                                           fill with blanks.
                11-18   |Date Emitted      |8              |Enter the date
                                                            emitted in the 
                                                            format "YYYYMMDD"
                19-27   |Total Emission    |9 (######.##)  |Enter the total
                                                            emission in lb to 
                                                            2 decimal places.  
                                                            Omit the decimal
                                                            point, right 
                                                            justify and zero 
                                                            fill.  No 
                                                            negative numbers.


             Code 1SM - SOx Major Source Record


             The Code 1SM data record is used to report SOx emissions from 
             Major SOx sources.

             Location   |Field             |Length         |Description
                 1-4    |Record Identifier |4              |Constant "1SM"
                                                           followed by 1 blank
                 5-10   |SCAQMD Permit     |6              |Enter the SCAQMD
                                                           permit number for 
                                                           the Number 
                                                           equipment source.
                                                           Left justify and 
                                                           fill with blanks.
                11-18   |Date Emitted      |8              |Enter the date
                                                           emitted in the 
                                                           format "YYYYMMDD"
                19-27   |Total Emissions   |9 (#####.##)   |Enter the total
                                                           emissions in lb to 
                                                           2 decimal places. 
                                                           Omit the decimal 
                                                           |point, right 
                                                           justify and zero 
                                                           fill.  No negative 
                                                           numbers.
                28-33   |Status Word       |6              |Enter the six
                                                           character status 
                                                           word for this hour 
                                                           from the Status 
                                                           Word Table.


             Status Word Table

             The Status Word Table is used to compile the status word for 
             the required reporting period.  True is 1 and False is 0.

             Location   |Field             |Length         |Description
                 1-1    |Valid Data        |1              |Enter true if 
                                                            valid data was 
                                                            obtained for the 
                                                            entire reporting 
                                                            period, else enter 
                                                            false

                 2-2    |Calibration       |1              |Enter true if the
                                                            monitoring system 
                                                            was calibrated 
                                                            during the 
                                                            reporting period, 
                                                            else enter false

                 3-3    |Off-line          |1              |Enter true if the
                                                           monitoring system 
                                                           was off-line at any 
                                                           time during the 
                                                           reporting period, 
                                                           else enter false.

                 4-4    |Alternate Data    |1              |Enter true if
                                                           alternate data 
                                                           acquisition was 
                                                           used during the 
                                                           reporting 
                                                           Acquisition period, 
                                                           else enter false.

                 5-5    |Out of Control    |1              |Enter true if the
                                                           CEMS was out of 
                                                           control during the 
                                                           reporting period, 
                                                           else enter false.

                 6-6    |Fuel Switch       |1              |Enter true if more
                                                            than one fuel type 
                                                            was used during 
                                                            the reporting 
                                                            period, else enter 
                                                            false.