LASAPCD ART.IV HEX. CHROMIUM EMISSIONS FROM COOLING TOWERS
LAST REVISED 11/11/11

                                  ARTICLE IV

          HEXAVALENT CHROMIUM EMISSIONS FROM COOLING TOWERS

          A.   PURPOSE
               To  comply  with the California Code of Regulations, Section
               93103,  by  controlling  airborne  emissions  of  Hexavalent
               Chromium.

          B.   DEFINITIONS

               1.   Chromium
                    Hexavalent  chromium. A substance identified as a toxic
                    air contaminant by the California Air Resources Board.

               2.   Cooling Tower
                    A device which  evaporates  circulating water to remove
                    heat  from  a  process, building  or  refrigerator  and
                    transfers the heat to the ambient air.

               3.   Facility
                    A business or businesses  which  employs  the  use of a
                    cooling  tower  that  is  owned or operated by the same
                    person or persons and is located  on the same parcel or
                    on contiguous parcels.

          C.   REQUIREMENTS

               1.   No person shall operate at any facility a cooling tower
                    in  which  Hexavalent Chromium has been  added  to  the
                    circulating water of the cooling tower.

               2.   The  concentration   of   Hexavalent  Chromium  in  the
                    circulating  water  of  the  cooling  tower  shall  not
                    exceed:

                    a.   0.15 milligrams per liter (mg/L) in any non-wooden
                         cooling tower;

                    b.   8.0  mg/L in any wooden cooling  tower;  and  0.15
                         mg/L,  effective  one  year  after the adoption of
                         this regulation, in any wooden cooling tower.

               3.   Every  person  who  operates  a  cooling   tower  shall
                    determine  by  American Public Health Association  Test
                    Method 312B the concentration of Hexavalent Chromium in
                    the circulating  water  every  six months in non-wooden
                    cooling  towers  and  every  month  in  wooden  cooling
                    towers.  Records  of Hexavalent Chromium  concentration
                    testing shall be kept  on  file  by  the  cooling tower
                    operator  for two years and shall be made available  to
                    the APCD upon request.

               4.   Testing may be discontinued if two consecutive required
                    tests show  that Hexavalent Chromium concentrations are
                    less than 0.15 mg/L. The Air Pollution Control District
                    (APCD) may require  testing of the circulating water at
                    any time to confirm that the circulating water does not
                    contain Hexavalent Chromium concentrations in excess of
                    0.15 mg/L.

               5.   Every person who operates  a cooling tower shall submit
                    to the APCD within 90 days after  the  adoption of this
                    rule a compliance plan stating the following:

                    a.   The name, address and phone number  of the cooling
                         tower operator;

                    b.   The cooling tower site specific location;

                    c.   Whether or not any Hexavalent Chromium  is used in
                         the circulating water of the cooling tower.

                    d.   The  date  on which the use of Hexavalent Chromium
                         in the circulating water of the cooling tower will
                         be discontinued.

          D.   COMPLIANCE SCHEDULE
               1.   Every person subject to this rule shall discontinue the
                    use of Hexavalent  Chromium in the circulating water of
                    cooling  towers  no  later  that  180  days  after  the
                    adoption date of this rule.

               2.   Except as provided in  C.2.b.,  every person subject to
                    this rule shall meet the 0.15 mg/L  Hexavalent Chromium
                    concentration limit in the circulating water of cooling
                    towers no later than 180 days after the  adoption  date
                    of this rule.