AMAAPCD RULE 903 CONTAMINATED SOIL REMEDIATION
LAST REVISED 06/28/94

Rule 903  Contaminated Soil Remediation. The purpose of this Rule
          is to limit the emission of organic compounds from soil
          that has been contaminated by organic chemical leaks or
          petroleum chemical leaks or spills, to describe an
          acceptable soil  remediation procedure, and to reduce
          public exposure to emissions for toxic compounds.

     903.1.    Definitions.

          A.   Active Storage Pile. A pile of contaminated soil
               to which soil is currently being added or from
               which soil is currently being removed. Activity
               must have occurred or be anticipated to occur
               within one hour to be current.

          B.   Aeration. Unheated exposure of contaminated soil
               to the open air.

          C.   Aeration Depth. The smaller of the following:  the
               actual average depth of contaminated soil or 0.5
               feet multiplied by the daily frequency with which
               soil is turned.

          D.   Aeration Volume. The volume of soil being aerated
               shall be calculated as follows:  the exposed sur-
               face area (in square feet) shall be multiplied by
               the aeration depth. The exposed surface area in-
               cludes the pile of excavated soil unless the pile
               is covered per Rule 903.2.E.

          E.   Bioremediation. The cleaning up of contaminated
               soil by an approved biological process.

          F.   Contaminated Soil. Soil which has an organic
               content, as measured in Rule 903.3.B, exceeding 50
               ppm by weight. The soil shall not contain more
               than 1 ppm benzene by weight. The soil to be
               treated shall be certified as nonhazardous by the
               generator or their qualified consultant, with
               concurrence of the appropriate administering
               agency, such as Environmental Health or Cal-EPA's
               Department of Toxic Substances Control. 

          G.   Organic Compound. Any compound of carbon,
               excluding methane, carbon monoxide, carbon
               dioxide, carbonic acid, metallic carbides or
               carbonate and ammonium carbonate.

          H.   Organic Content. The concentration of organic
               compounds measured in the composite sample
               collected and analyzed using the procedures in
               Rule 903.3.B.

          I.   Remediation. The cleaning up of contaminated soil
               by an approved process.

          J.   Sensitive Area. Any area where there are substan-
               tial concentrations of people for an extended
               period of time. These areas include, but are not
               limited to a park, a shopping center, a government
               center, or a residential neighborhood.  

          K.   Soil Washing. A process which uses specially
               formulated detergents and water in washing
               equipment to remediate gasoline, diesel, or oil
               contaminated soil.

          L.   Thermal Remediation. A process in which
               contaminated soil is fed into a rotary drum where
               a hot air stream drives off the moisture and
               organic compounds. The gas stream is then
               channeled to the control device system and
               discharged to the atmosphere. 

903.2     Requirements. 

          A.   Excavation. 

               1.    Soil will be kept moist to contain
                    hydrocarbons and reduce dust emissions during
                    excavation.

               2.   Soil will be placed on an impermeable
                    material, and covered securely with an
                    impermeable material until proposed treatment
                    method has been submitted and approved by the
                    District in the form of a Permit to Operate
                    or a written exemption from the Permit to
                    Operate requirement.

          B.   Aeration Without Control Device. Based on the
               specific level of contamination, a person shall
               not aerate contaminated soil at a rate in excess
               of that specified in the following table.  The
               limitations in the table apply to the entire
               facility, and indicate the volume of contaminated
               soil that may be added, on any one day, to soil
               that is already aerating.


              -----------------------------------------------
             |  Organic Content     |       Volume of Soil   |
             |  ppm(weight)         |      (cubic yards/day) |
             |----------------------|------------------------|
             |       <50            |         exempt         |
             |----------------------|------------------------|
             |     50 - 99          |          600           |
             |----------------------|------------------------|
             |     100 - 499        |          120           |
             |----------------------|------------------------|
             |     500 - 999        |           60           |
             |----------------------|------------------------|
             |    1000 - 1999       |           30           |
             |----------------------|------------------------|
             |    2000 - 2999       |           15           |
             |----------------------|------------------------|
             |    4000 - 4999       |           8            |
             |----------------------|------------------------|
             |       >5000          |          0.1           |
             |______________________|________________________|



          C.   Aeration with a Control Device. Soil may be
               aerated at rates exceeding the limitation of
               903.2.B. above, provided emissions of organic
               compounds to the atmosphere are reduced by at
               least 90% by weight.

          D.   Bioremediation soil washing, thermal incineration,
               or other remediation proposals will be evaluated
               from the Authority to Construct application and
               appropriate conditions placed on the Permit to
               Operate.  The conditions shall ensure safe
               operation, limit emissions, and prevent creation
               of a public nuisance.   These processes are also
               subject to the risk assessment requirements of
               903.3.C  and total hydrocarbon release to the
               atmosphere per table in 903.2.B.

          E.   Storage Piles. Contaminated soil which is not
               being aerated shall be covered except when soil is
               being added or removed. Any uncovered contaminated
               soil will be considered to be aerated. The soil
               may be covered with an impermeable covering, pro-
               vided no head space where vapors may accumulate is
               formed and provided the covering is in good condi-
               tion and is secured adequately so as to minimize
               emissions to the atmosphere.

          F.   Exemptions. 

               1.   The requirements of this rule shall not apply
                    to the emergency soil decontamination which
                    may be performed by, under the jurisdiction
                    of, or pursuant to the requirements of, an
                    authorized health officer, agricultural
                    commissioner, fire protection officer, or
                    other authorized agency officer. Whenever
                    possible, the APCO shall be notified prior to
                    commencement of such action.

               2.   Contaminated soil exposed for the sole
                    purpose of sampling shall not be considered
                    to be aerated. Removal of soil for sampling
                    shall not qualify a pile as "active."

               3.   Upon receipt of an Authority to Construct
                    application demonstrating that the soil is
                    contaminated exclusively by hydrocarbons with
                    a boiling point of greater than or equal to
                    302 degrees F (diesel oils, hydraulic oils,
                    etc.), the aeration limits in 903.2.B shall
                    be waived. Written permission to aerate the
                    soil under the exemption and waiver from the
                    Permit to Operate requirement will be issued.
                    

903.3     Administrative Requirements. 

          A.   Notification. The person responsible for the aera-
               tion of any contaminated soil shall provide the
               following information to the District in the form
               of an Authority to Construct/Permit to Operate
               application:

               1.   Estimated total quantity of soil to be
                    aerated.

               2.   Estimated total quantity of soil to be
                    aerated per day.

               3.   Estimated average degree of contamination, or
                    total organic content of soil.

               4.   Chemical composition of contaminating organic
                    compounds and a description of the basis on
                    which these estimates were derived (soil
                    analysis test reports, etc.).

               5.   Indication of whether the site is within 1000
                    feet of a school, hospital, health care
                    facility, or other sensitive area.      

          B.  Testing Requirements.

               1.   Sampling.

                    a.   Each 50 cubic yard pile shall be
                         considered to have four equal sectors.
                         One sample shall be taken from the
                         center of each sector. Samples shall be
                         taken at least three inches below the
                         surface of the pile. Samples shall be
                         composited from the four sectors by the
                         test laboratory.

                    b.   One composite sample shall be collected
                         and analyzed for every 50 cubic yards of
                         excavated contaminated soil to be
                         remediated. At least one composite
                         sample shall be collected from each
                         inactive, uncovered storage pile within
                         24 hours of excavation. Samples are not
                         required if soil is uncontaminated.

                    c.   Samples shall be taken using one of the
                         following methods:

                         (1)  Samples shall be taken using a
                              driven-tube type sampler, capped
                              and sealed with inert materials,
                              and extruded in the laboratory in
                              order to reduce the loss of
                              volatile materials; or

                         (2)  Samples shall be taken using a
                              clean brass tube (at least three
                              inches long) driven into the soil
                              with a suitable instrument. The
                              ends of the brass tube shall then
                              be covered with aluminum foil, then
                              plastic end caps, and finally be
                              wrapped with  a suitable tape. The
                              samples shall then be immediately
                              placed on ice or dry ice for
                              transport to a laboratory.

               2.   Measurement of organic content. Organic
                    content of soil shall be determined by the
                    methods found in  Appendix A of the "Leaking
                    Underground Fuel Tank Field Manual" of the
                    State Water Resources Control Board, or the
                    "Tri-Regional Board Staff Recommendations for
                    Preliminary Evaluation and Investigation of
                    Underground Tank Sites," or any other method
                    approved by the APCO, in writing, in advance. 
                    Benzene content in soil is to be quantified
                    as well as the total organic content.

               3.   Total hydrocarbon and benzene emission rates
                    will be estimated using the following
                    factors:

                    a.   The average total hydrocarbon or benzene
                         concentration found by sampling and
                         analysis of the soil stockpile.

                    b.   Five days of aeration.

                    c.   The total volume of soil in cubic yards.

                    d.   A soil density of 3900 lb/cubic yard.

          C.   Risk Assessment. At the discretion of the APCO, no
               remediation project may occur until a screening
               level risk assessment is completed and submitted,
               using as a minimum, the screening risk assessment
               using the CAPCOA "Air Toxics Assessment Manual," 
               to the  APCO for review and approval.
     
          D.   Final Disposition. Written notification of the
               final disposition of the soil, including final
               laboratory test results, shall be submitted to the
               District within one week of the completion of the
               remediation. The notification shall include test
               results showing the final hydrocarbon levels. 

     903.4     Additional Requirements. Upon excavation of
               underground tanks or exposure of 50% of the
               underground piping at retail service stations, the
               retail service station is required by state law to
               have Phase I and Phase II vapor recovery installed
               before commencing to sell gasoline again (see
               District Rule 902 for requirements). An Authority
               to Construct application separate from the r-
               emediation application must be filed for the
               installation of the vapor recovery systems.

          Additional permits or approvals may be required from
          other agencies.