Heads up: There are no amended sections in this chapter.
   (a)   Specified compressive strength. The specified compressive strength f'c, of concrete conveyed by pumping methods shall not exceed 5,000 pounds per square inch.
   (b)   Mix proportioning. 
      (1)   All controlled concrete to be pumped shall:
         (i)   Comply with all provisions of §27-605: Mixes
         (ii)   For Normal and Heavyweight Concrete be proportioned in accordance with ACI 211.1-74, utilizing Table 1.
Table 1.
Volume of Course Aggregate per Unit of Volume of Concrete*
Maximum size of aggregate, in.
Volume of dry-rodded coarse aggregate per unit. Volume of concrete for different fineness moduli of sand**
*Values established at Median-Point (reduced 5%). See footnote Table 5.3.6 ACI 211.1-74.
**The type and graduation of the course aggregate, delivery system and job conditions may require these values to be varied. However in no event shall the variations exceed the maximum allowance noted in ACI 211.1-74 Table 5.3.6.
         (iii)   For sand lightweight concrete be proportioned in accordance with ACI 211.2.-69 utilizing Table 2 except that the air dry unit weight of the concrete may exceed 115 lb. per cu. ft. when tested at age 56 days in accordance with procedure in ASTM C 567.
Table 2.
Volume of Coarse Lightweight Aggregate per Cubic Yard of Concrete***
Maximum size lightweight aggregate, in
Fineness Modules of Natural Sand
Course aggregate cu. ft. per yard****
***Volumes are based upon lightweight aggregate at a total moisture content of 8 percent in loose conditions as described in ASTM C29.
****These values may be increased based on the type, graduation and moisture content of the aggregates, delivery system and job conditions.
      (2)   (i)   The type, graduation and moisture content of the aggregate delivery system and job conditions may affect the slump necessary at the mixer for the proper conveying of the concrete. For these reasons in addition to the recommended mix established from the preliminary trial mix data obtained in accordance with §27-605(a)(2), two alternative mixes also shall be recommended. These alternate mixes shall be based upon the water cement ratio curve in the preliminary test data to produce concrete having slumps greater than the maximum specified in §27-605(a)(2) in increments of l-inch for concrete manufactured with gravel or stone aggregate best not to exceed 8 inches or increments of 2 inches for concrete manufactured with lightweight aggregates but not to exceed 9 inches.
         (ii)   It shall be permissible to use these mixes interchangeably during the course of the work, providing the slump as the mixer is equal to or less than that provided for the applicable recommended mix.
         (iii)   The recommended preliminary trial mix shall indicate the design unit weight in lbs. per cu. ft. of the fresh concrete and the estimated air dry unit weight at 56 days.
   (c)   Testing and inspection of controlled concrete.
      (1)   Those samples of concrete for test purposes required by RS 10-3, § 4.3.1. which are designated to be "taken out of the bucket, hopper or forms" shall be obtained by passing a receptacle completely through the discharge stream of the delivery line or by completely diverting the discharge into a container. Transport the sample concrete to the place where fresh concrete tests of slump, air content, temperature and unit weight are to be performed and where specimens for strength tests are to be molded in accordance with RS 10-51 and RS 10-52 as directed by the Architect or Engineer designated for controlled concrete inspection. Each of the foregoing three (3) test cylinders per one hundred and fifty (150) cubic yards required under § 4.3.1 of RS 10-3 shall be taken from a different delivery vehicle.
      (2)   Where the concrete is discharged directly into the forms by pumping methods the slump taken at the end of the delivery line shall be used to determine conformance with the slump specified for the work.
      (3)   The results of tests of samples taken at the end of the pump delivery line shall be shown on the same report with corresponding tests of samples taken from the same batch at the mixer.
      (4)   (i)   Included in the duties of the on-site inspector as provided by §27-607 shall be:
            (A)   That water is added only to the mixer or under the following circumstances to the hopper of the pump:  When a portion of the concrete is discharged from the mixer into the pump hopper at a slump below that specified in the preliminary trial mix and too low for pumpability, water may be added to this concrete in the pump hopper to bring it to the specified slump provided all pumping action is stopped. Before pumping is resumed the concrete in the hopper must be thoroughly remixed for a minimum period of 2 minutes after all of the water has been added. If the concrete cannot be properly remixed it shall be removed from the hopper and discarded.  The balance of the batch in the mixer shall be adjusted to the specified slump before further discharge.
            (B)   Examination of the conveying line for leakage of cementitious material.
            (C)   Verify that no aluminum pipe is used.
         (ii)   Included in the duties of the batch plant inspector as provided for in §27-605(a).
      (5)   A.B., shall be:
         (i)   To make adjustments for variations in fineness modulus of the fine aggregate as per ASTM C 33, Section 3.4. When the difference of fineness modulus of the fine aggregate is more than 0.2 for each 0.2:
            (A)   Below the Design Fineness Modulus deduct 50 lbs. from the dry batch weight of the fine aggregates and add 50 lbs. for normal weight (20 lbs. lightweight) to the dry batch weight of the coarse aggregates.
            (B)   Above the Design Fineness Modulus add 50 lbs. to the dry batch weight of the fine aggregate and deduct 50 lbs. for normal weight (20 lbs. lightweight) from the dry batch weight of the coarse aggregates.
         (ii)   To test lightweight aggregates for total moisture content each day before the first concrete for the project is batched and thereafter at appropriate intervals during the day or whenever a moisture change may be evident. The moisture content of each test shall be reported on the corresponding inspection ticket accompanying each load of concrete.
         (iii)   To immediately notify the concrete producer and the contractor when the total moisture content of the lightweight is 8 percent or less, that a change to an alternate mix may be necessary to maintain the water cement ratio and the slump specified for the work as determined at the end of the delivery line.
   (d)   Job practices.
      (1)   Slump shall be maintained as uniformly as possible from batch to batch in conformance with the specified slump.
      (2)   Delivery systems shall be in good condition. No dented or worn thin section shall be used.
      (3)   All connections shall have clean grooves, be equipped with gaskets and securely coupled except at the end of the system where sections are being reconnected gaskets may be omitted.
      (4)   All vertical risers shall be straight and firmly secured. Pipe bends shall also be restrained against movement caused by the pumping action.
      (5)   Clean out procedures shall assure that there is no uncontrolled ejection of concrete or clean out devices at the end of the delivery line. If pressure water is used for cleanout, care shall be taken that the water is not deposited into the form.
      (6)   Care shall be taken that portland cement and sand slurry used to prime the delivery line shall not be deposited in the form without the approval of the architect or engineer designated for Controlled Inspection. All other types of printing liquids shall not be permitted to be placed in the form.
      (7)   Pumping aids, coloring agents, and all other admixtures shall be permitted only when included in the preliminary trial mix design.
      (8)   Flexible hose, used in the system shall be handled so as to permit the full flow of the concrete without restriction, reduction of cross sectional area of kinking.
      (9)   Free hanging, coupling connected sections of flexible delivery line shall have additional restraint between each section across each joint.
      (10)   Personnel shall avoid standing close to the outlet end of the concrete pump.
   (e)   Quality control.
      (1)   The engineer who designed the structure shall specify on his plans, or an amendment thereto, that concrete may be conveyed by pumping.
      (2)   The placement of concrete by pumping shall be suspended on any project where required test reports are not submitted to the Borough Superintendent within six weeks from the date of placement and sampling.
   (a)   General.
      (1)   Each laboratory shall have in responsible charge a Director who shall be professionally qualified and who shall personally supervise all technical functions of the laboratory relating to testing of concrete and concrete materials.  Sections 27-605 and 27-607 of the Administrative Code require that a licensed Professional Engineer or a Registered Architect supervise the testing of materials and the inspection of concrete construction.
      (2)   All technicians shall be qualified to perform all tests they may be required to conduct under the supervision of the Director.
      (3)   The laboratory shall annually furnish to the Department of Buildings a list of all personnel who are supervising and performing tests and their qualifications.  Note: 1 RCNY §5-02(b)(6) shall also be complied with.
      (4)   The laboratory shall furnish to the Department of Buildings a list of all the equipment used to perform tests on concrete and concrete materials.
      (5)   The laboratory shall request and have an inspection made of its procedure and equipment by the "Cement and Concrete Reference Laboratory" whenever the "Cement and Concrete Reference Laboratory" is inspecting laboratories in this area on its cyclical tour of inspection. These inspections shall be made at the cost and expense of the laboratory seeking a license. A copy of the inspection report shall be promptly submitted to the Department of Buildings.
      (6)   The laboratory shall correct within 10 days any condition ordered by the Department of Buildings which in its judgment may adversely affect the results of any test.
      (7)   A license shall be issued to each applicant upon proof of compliance with these rules and upon payment of a fee of one hundred dollars ($100).
      (8)   The annual renewal fee shall be fifty dollars ($50).
      (9)   A violation of any of these rules or the falsifying or misrepresentation of any fact in any required report shall constitute cause for revocation or suspension of the license by the Commissioner, after a hearing upon prior notice of at least ten calendar days. However, notwithstanding the foregoing, when the public safety may be imminently jeopardized or when false report has been made, the Commissioner shall have the power, pending a hearing and determination of charges, to forthwith suspend the license for a period not exceeding five working days. The presence of batch tickets at a plant filled in on any day other than the day the specific batch is to be delivered to the construction site, whether signed or unsigned, shall constitute a false report.
      (10)   All reports submitted by the laboratory shall bear its name and its license number.
      (11)   Renewal of licenses or certificates of qualification, heretofore issued, and issuance of new licenses shall be conditioned upon and subject to the provisions of §§26-131 through 26-139 and 26-200 through 26-204 of the Administrative Code.
      (12)   The laboratory shall display a copy of its license on its premises.
      (13)   The Director shall furnish all of his employees an identification card with a photograph of the employee affixed thereto.
      (14)   The Director shall maintain a daily record of the activities of all of his employees, indicating the time of departure to and return from batch plant or construction site inspections, the construction project to which the employee is assigned, and the batch plant visited. This record shall be maintained for 2 years and shall be made available to the department personnel.
   (b)   Personnel.
      (1)   The Director shall be qualified by virtue of education and experience to supervise all tests of concrete and concrete materials conducted by the laboratory. He shall be qualified to practice Professional Engineering or Architecture in the State of New York.
      (2)   All technicians performing tests on the chemical composition of cement shall be qualified analytical chemists.
      (3)   All other technicians, field personnel, and all personnel having direct supervision of technical staff shall be qualified by education and experience to take samples and perform required tests. Qualifying education and experience may include a degree in engineering, suitable experience in concrete construction, suitable training in concrete industry sponsored programs and the like.
      (4)   Satisfactory proof of such qualifications for concrete field testing technicians shall include certification resulting from the ability to pass a qualification test following the guidelines of the American Concrete Institute as set forth in ACI publication CP-2(82).
      (5)   All concrete field testing technicians shall be qualified pursuant to 1 RCNY §5-02(b)(4) on or before July 1, 1985.
      (6)   The Department of Buildings shall annually publish in The City Record, on or before the first of July, a listing of concrete field testing technicians qualified pursuant to 1 RCNY §5-02(b)(4).
      (7)   The Director shall submit to the department an affidavit that all technicians and field personnel are qualified to perform their designated tasks and shall keep on the premises a record of the qualifications of all personnel, which shall be made available to the department upon request.
   (c)   Reports. Reports shall be presented in a form acceptable to the Department of Buildings.
   (d)   Tests.
      (1)   The following specifications of the American Society for Testing and Materials (ASTM) shall be considered as part of these rules:
Test for Unit Weight and Voids in Aggregate.
Methods of Making and Curing Concrete Test Specimens in the Field.
Test Method for Compressive Strength of Cylindrical Concrete Specimens.
Test Method for Organic Impurities in Fine Aggregates for Concrete.
Methods of Obtaining and Testing Drilled Cores and Sawed Beams of Concrete.
Standard Method of Test for Surface Moisture in Fine Aggregate.
Test Method for Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate.
Test Method or Compressive Strength of Hydraulic Cement Mortars (Using 2-inch or 50-mm cube Specimens).
Method of Chemical Analysis of Hydraulic Cement.
Standard Method of Test for Fineness of Portland Cement by the Turbidimeter.
Test Method for Material Finer than 75-um (No. 200) Sieve in Mineral Aggregates by Washing.
Test Method for Specific Gravity and Absorption of Coarse Ag- gregate.
Test Method for Specific Gravity and Absorption of Fine Aggregate.
Method for Sieve Analysis of Fine and Coarse Aggregates.
Standard Method of Test for Unit Weight, Yield and Air Content (Gravimetric) of Concrete.
Test Method for Slump of Portland Cement Concrete.
Test Method for Autoclave Expansion of Portland Cement.
Method of Sampling Fresh Mixed Concrete.
Standard Method of Test for Air Content of Freshly-Mixed Concrete by the Volumetric Method.
Method of Sampling and Acceptance of Hydraulic Cement Mortar.
Test for Fineness of Hydraulic Cement by the 150-um (No. 100) and 75-um (No. 200) Sieves.
Test Method for Normal Consistency of Hydraulic Cement.
Test Method for Tensile Strength of HydraulicCement Mortars.
Test Method for Time of Setting of Hydraulic Cement by Vicat Needle.
Method of Making and Curing Concrete Test Specimens in the Laboratory.
Test Method for Fineness of Portland Cement by Air Permeability Apparatus.
Specification for Flow Table for Use in Tests of Hydraulic Cement.
Standard Method of Test for Air Content of Freshly-Mixed Concrete by the Pressure Method.
Specification for Air-Entraining Admixtures for Concrete.
Test for Time of Setting of Hydraulic Cement by Gillmore Needles.
Specification for Chemical Admixtures for Concrete.
Resistance to Abrasion of Small-Size Coarse Aggregate by Use of Los Angeles Machine.
Resistance to Degradation of Large-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine, Test for
Penetration Resistance to Hardened Concrete, Test for
Practices for Load Verification of Testing Machines.
      (2)   All testing of cement shall be conducted in accordance with the Standard Specifications of the American Society for Testing and Materials (A.S.T.M.).
   (e)   Curing and testing of concrete specimens.
      (1)   The laboratory shall be equipped with a suitable size enclosed room for the curing of all concrete test specimens. It shall be of such size that specimens can be easily handled during storage and preparation for testing. The room shall be equipped with the necessary equipment to maintain a temperature of 73.4 degrees 3.0 degrees F. at all times, as per A.S.T.M. C-192. The room also shall be equipped to maintain a relative humidity of 95 percent plus in order that the specimens will be maintained in a moist condition in which free water is on the surface at all times. The test specimen shall not be exposed to a stream of running water.
      (2)   The laboratory shall have equipment for determining relative humidity and temperature of the room and recording devices to monitor them.
      (3)   The laboratory shall be equipped with a power operated testing machine with a variable speed control. It shall be of sufficient capacity and capable of applying load without shock at a rate of loading prescribed in § 4(b) of A.S.T.M. C-39.
      (4)   The testing machine shall be equipped with two steel bearing blocks with hardened faces, one of which is a spherically seated block that normally will bear on the upper surfaces of the specimen and the other a plain rigid block on which the specimen will rest. The bearing faces of these blocks used for compression testing of concrete shall have a Rockwell hardness of not less than 55 HRC. The bearing faces shall be at least as large and preferably slightly larger than the surface of the specimen to which the load is applied. The bearing faces when new shall not depart from a plan by more than 0.0005-inch at any point and they shall be maintained within a permissible variation limit of 0.001-inch. The movable portion of the spherically seated block shall be designed so that the bearing face can be rotated freely and tilted through small angles in any direction.
      (5)   The machine, if hydraulic, shall be equipped with a dial gauge having a sufficient diameter to allow the increments of load to be read within plus or minus 1/2 percent of the load being applied.
      (6)   The machine shall show a certificate of calibration or verification within the time limits set by requirements of A.S.T.M. E-4. If any major repairs have been made on the testing machines, the machine shall be re-calibrated.
   (f)   Equipment. The laboratory shall provide and maintain in proper working condition the following equipment as a minimum requirement:
      (1)   Necessary for concrete mix designs:
         (i)   Concrete mixer
            (A)   1 1/2 cubic foot capacity
            (B)   3 1/2 cubic foot total drum volume
         (ii)   Slump cone 8-inches in diameter at the base and 4-inches at the top of a height of 12-inches and conforming to A.S.T.M. C143.
         (iii)   A tamping rod consisting of a round, straight steel rod 5/8-inch in diameter.
         (iv)   Cylindrical metal measures of 1/2 cubic foot and a cubic foot capacity conforming to the requirements of A.S.T.M. C138.
         (v)   A sturdy, flat plate about 15-inches square for striking off the concrete in the measure.
         (vi)   Appropriate air meter.
         (vii)   Necessary scoops, wood floats, trowels.
         (viii)   A balance or scale sensitive to 0.1 pound, having a capacity of not less than 100 pounds.
      (2)   Necessary equipment for preparation of concrete test cylinders:
         (i)   For compression tests:
            (A)   Capping plates for cement or plaster caps. Plate glass at least 1/4-inch thick, or machined metal plates at least 1/2-inch thick or polished stone plates of suitable materials, such as granite or diabase and at least 3-inches thick. A capping plate shall be at least l-inch greater in diameter than the specimen.
            (B)   Capping plates for use with mixtures of sulphur and granular materials, or similar materials and dimensions, recessed to retain the molten mixture.
            (C)   The surface of any capping plate shall not depart from a plane by more than .002-inch in the diameter of the specimen.
            (D)   Straight edge and feeler gauges to check planeness of capping plates and caps.
            (E)   Calipers and rule for checking size of cylinders.
            (F)   Controlled temperature melting pot if sulphur mixtures are to be used. Mixing pans, scoops, spoons, trowels, spatulas, etc., if cement or plaster caps, are to be used.
            (G)   Appropriate grinding equipment may be substituted for the capping equipment.
         (ii)   Materials required:
            (A)   For cement or plaster caps, any of the following:
                  Type I Portland Cement
                  High Alumina Cement (Lumnite)
                  Type III Portland Cement
                  High strength gypsum plasters such as:
                  Hydrostone and Hydrocal White (Note: Plaster of Paris is not satisfactory).

            (B)   For sulphur caps either of the following:  Laboratory prepared mixtures of sulphur and granular materials.  Proprietary mixtures such as: Vitroband, Leadite, Cylcap, etc. (Note: See A.S.T.M. C1982 for limitations of various type caps).
      (3)   Necessary for analysis of fine and coarse aggregates:
         (i)   Square or round mesh sieves, Pan Nos. 200, 100, 50, 30, 16, 8, 4, 1/4-inch, 3/8-inch, 1/2-inch, 3/4-inch, 1-inch, 1 1/2-inches, 2-inches, 3-inches, 3 1/2-inches, No. 12.
         (ii)   Sieve shaking equipment.
         (iii)   Scales:
            (A)   Gram scale sensitive to at least 0.1 gram.
            (B)   Gram scale with at least 5,000 gram capacity and sensitive to 1 gram.
            (C)   Pound scale sensitive to 1/4-ounce.
            (D)   Steel brush to brush sieves.
            (E)   Oven-heat continuously between 221 degrees and 230 degrees F.
            (F)   Containers for holding solutions.
            (G)   Perforated containers for immersing aggregates in solutions - wire baskets.
            (H)   Calibrated Volumetric (milliliters) graduate, 500 milliliters capacity.
            (I)   Conical metal mold 1 1/2-inches diameter at top, 3 1/2-inches diameter at bottom, 2 7/8-inches high.
            (J)   Tamping rod - 12-ounces, having a flat circular tamping face l-inch in diameter.
            (K)   Tamping rod - 5/8-inch diameter, 24-inches length.
            (L)   Cubic foot cylindrical measure either 1/2 cubic foot, 1/4 cubic foot, 1/3 cubic foot, 1/10 cubic foot or 1 cubic foot.
            (M)   500 milliliters flask.
            (N)   Thermometer - heats over 100 degrees C.
      (4)   Necessary for field testing and inspection:
         (i)   Thermometer, 0 degrees-200 degrees F.
         (ii)   Scale, 100 lbs. capacity.
         (iii)   6-inch round by 12-inch long container.
         (iv)   Slump cone and 5/8-inch by 24-inch rod.
         (v)   Air meter.
         (vi)   Rule, 12-inches.
   (g)   Cement testing.
      (1)   Introduction. Cement testing shall be done in laboratories equipped to make the basic tests required for evaluating cement.
      (2)   Division into physical and chemical tests. These tests are divided into two parts, physical and chemical and all physical test specimens shall be prepared in a room or area where the temperature is controlled within the limits of 20 to 27.5 degrees C. and the humidity at not less than 50 percent.
      (3)   Physical test equipment:
         (i)   Analytical balance complete with calibrated weights.
         (ii)   Scale of 2,000 gram capacity accurate to 0.1 percent.
         (iii)   Wagner Turbidimeter or Blaine permeability apparatus calibrated with standard cement from the Bureau of Standards.
         (iv)   One 325 mesh sieve as well as 100, 50, 30 and 16 mesh sizes.
         (v)   Electrically driven mixer bowl and paddle.
         (vi)   Flow table and flow mould.
         (vii)   Trowel and tamper for cubes.
         (viii)   Cube moulds and sealing compound.
         (ix)   Autoclave, moulds and comparator with steel reference bar.
         (x)   Vicat apparatus and moulds.
         (xi)   Gilimore needles and glass plates for samples.
         (xii)   LeChatelier flask.
         (xiii)   Supply of graded Ottawa Sand.
         (xiv)   Glass graduates of 100, 150 and 200 ml. capacity.
         (xv)   Cylindrical measure of 400 ml.
         (xvi)   Straight edge and spatula.
         (xvii)   Calibrated testing machine of not less than 30,000 lbs., capacity equipped with spherically seated upper steel block of not more than 31/2 diameter.
      (4)   A.S.T.M. standard tests for cements. Standard tests for cements as required by A.S.T.M. are as follows:
            Time of setting
            Air content of mortar
            Compressive tests of 2-inch by 2-inch cubes.

      (5)   Chemical composition of cement:
         (i)   The laboratory shall be equipped with an analytical balance and standard weights, platinum and porcelain crucibles, curettes, pipettes, etc.
         (ii)   Distilled water and all reagents necessary for the determination of the oxides of silica, iron, aluminum, magnesium, sulphur, calcium, and insoluble residue by one of approved.
         (iii)   All tests shall be performed in a room equipped with fume chamber, gas burners, working benches, by a qualified analytical chemist.
         (iv)   Special tests such as the alkalies of sodium and potassium shall be made as outlined by the A.S.T.M.
Section in original publication July 1, 1991.
   (a)   Source of concrete mixes. Concrete proportioned according to prequalified mixes shall be produced only from batch plants, approved by the Commissioner pursuant to rules and regulations of the department.
   (b)   Mix designs not previously accepted. Each concrete producer or group of producers seeking approval of mix designs that have not been previously accepted by the Department shall file an application with the M.E.A. Division, Department of Buildings at the address provided in the City's website, http://www.nyc.gov, and shall furnish the following:
      (1)   A compilation of the proposed mix designs listing the batch weights, types of aggregates and other ingredients together with a numbering system that will provide identification of each mix for testing and recording purposes. Each compilation shall contain a title sheet upon which a master list of all the mixes shall be designated. Opposite each mix a space shall be provided for the signature of the examiner and the date of the approval of that particular mix. When a mix has been approved for use as a "PREQUALIFIED MIX," the examiner shall affix his signature and the date in the space provided, and then he shall affix the approval stamp of the Commissioner of Buildings.
      (2)   For each mix utilizing a different combination of aggregates, admixtures, cement type, water-cement ratio, etc., a report of preliminary trials made by a testing laboratory licensed under §26-200 together with an attestation by the Architect or Engineer who supervised the making of the preliminary tests.  The laboratory report shall include the following information:
         (i)   Fine and coarse aggregate.
            Type (natural or manufactured sand, gravel, stone, etc.).
            Weight per. cu. ft. dry rodded.
            Specific gravity.
            Percentage of voids.
            Percentage of absorption.
            Fineness modulus (see ASTM Definitions C125).
            Gradation and comparison to ASTM C-33; also size of coarse aggregate.

         (ii)   Cement-type.
         (iii)   Batch weights.
         (iv)   Admixtures-type and amount.
         (v)   Test results of each particular mix design being submitted for approval. Separate tests shall be made for each compressive strength.
         (vi)   Attestation of the Architect or Engineer engaged by the producer or producers to supervise the tests.
         (vii)   Board of Standards and Appeals Cal. No. for items requiring Board approval, such as lightweight aggregate admixtures, etc.
         (viii)   Such other information required by §§27-605(a)(1), (2) and (3).
      (3)   Each concrete producer or group of producers that submits for approval the information required hereabove, shall be assigned an application number which is to be known as the "PREQUALIFIED MIX REFERENCE NUMBER." This REFERENCE NUMBER shall be valid only for the calendar year for which it is issued. All applications shall be submitted before November 1 of each year for review and for prequalification for the calendar year next following.  When the concrete proposed for use is to be produced using the mix designs from a summary compilation that has been approved, the architect or engineer who has been retained to make or supervise the Controlled Inspection shall verify that the mixes have been approved as "PREQUALIFIED MIXES" and shall file a statement for each project setting forth the PREQUALIFIED MIX REFERENCE NUMBER from which the concrete mix proportions are to be selected.
   (c)   Mix designs previously approved and used.
      (1)   Each concrete producer making an application shall be assigned a PREQUALIFIED MIX REFERENCE NUMBER in the same manner as designated in 1 RCNY §5-03(b)(3).
      (2)   The application shall set forth the details of location, date and laboratory that pertained to the previous project. It also shall include a statement setting forth the average strength obtained from tests made at the job, together with a summary of the total number of tests made and, of those tests, how many fell below the specified strength.
      (3)   A copy of the laboratory report that was originally accepted shall be submitted. It shall contain the information listed under 1 RCNY §5-03(b)(2). (Reports with the water-cement ratios selected at a point on the curve established by preliminary mix tests corresponding to a strength of concrete 15% higher than the minimum ultimate strength called for on the plans shall not be accepted, unless the water-cement ratio complying with §27-605(a)(2) can be determined.)
      (4)   The Architect or Engineer retained for the Controlled Inspection shall file a statement similar to the one mentioned in 1 RCNY §5-03(b)(3).
   (a)   The scope of these rules relating to facilities for the production of concrete under Article 5 of Subchapter 10 of Chapter 1 of Title 27 of the Administrative Code shall be applicable to batch plant installations of either a permanent or temporary nature, located on or off the site of construction.
   (b)   Application for approval of a batch plant shall be made on behalf of the owner by an engineer on department forms filed with the Commissioner of Buildings at the address provided in the City's website, http://www.nyc.gov. No off-site batch plants will be acceptable unless the legal use of the premises as a batch plant has been previously approved by either the Department of Buildings or the Department of Small Business Services.
   (c)   The concrete producer shall supply a list of all plant equipment to be used in the batching of concrete on forms furnished by the department.
   (d)   The concrete producer shall engage a Licensed Professional Engineer, not in his regular employ, to inspect the batching facilities. This inspection shall be made at the cost and expense of the concrete producer seeking plant approval. A copy of the verification of the inspection shall be submitted with the application for plant approval on forms furnished by the department.
   (e)   The applicant shall follow inspection procedures and complete the check list on forms furnished by the department which shall accompany the application for plant approval.
   (f)   The concrete producer shall promptly correct any objection made by the department which in its judgement it deems may adversely affect the quality of the concrete being placed. Should the department find any objection because of the producer's failure to meet the necessary standards for plant approval, corrections shall be made within 30 working days after the receipt, by the producer, of a written notice from the department.
   (g)   Approval of plant facilities shall be fully rreviewed every two years upon a renewal submission for approval by the concrete producer provided the plant is not relocated during the two-year period.
   (h)   If a concrete plant is relocated from the location as filed on the original application form after initial approval is received, a new submission shall be required.
   (i)   During the two-year approval period, if any equipment is changed, added to, modified or moved within the same premises as originally filed, notification will be sent to the Commissioner of Buildings, Materials and Equipment Acceptance Division at the address provided in the City's website, http://www.nyc.gov. Accompanying said notification shall be an amendment to the application verified by an affidavit from a professional engineer not in the regular employ of the concrete producer stating that the modification meets all requirements of the check list.
   (j)   The concrete producer shall be required to produce concrete in accordance with all applicable provisions of the Building Code and all pertinent reference standards referred to therein.
   (k)   The concrete producer shall be required to submit attestations and certifications specified in §§27-605 and 27-606 promptly for the appropriate type of concrete for each construction project. Where automated batching equipment is used, the tapes recording the batched weights shall be available for inspection for a period of two years.
   (l)   Concrete produced for the construction of buildings subject to controlled inspection of concrete shall not be batched and delivered to the construction site unless a person designated for batch plant inspection is present at the plant. However, it shall be permissible to deliver the concrete in the absence of the person designated for inspection when there are extenuating circumstances, provided the design architect or engineer and the architect or engineer designated for control inspections are notified promptly by phone with a follow-up letter. The follow-up letter shall indicate the circumstances under which the uninspected concrete was shipped and shall supply all necessary facts such as the times and dates and volume of concrete batched and delivered, the design strength and mix proportions, and the application number, location, and contractor that the concrete is being delivered to. Similarly, the appropriate Borough Superintendent's office is to be promptly notified by phone with a follow-up letter together with copies of the other required notification letters.
   (m)   Approval shall be for a period of two years. However, temporary approval of batch plants may be authorized at the discretion of the Commissioner for a period of ninety days, provided an application for approval with necessary information furnished on appropriate forms is filed, and provided the application is otherwise acceptable in other respects. Temporary approvals may be renewed for additional ninety day periods at the discretion of the Commissioner.
   (n)   Concrete producers shall be required to permit complete plant inspections by department personnel periodically.
   (o)   A copy of the batch plant approval will be forwarded to the owner of each facility and shall be posted in a conspicuous place at the plant.
   (p)   A violation of any of these rules or the falsifying or misrepresentation of any fact in the application or in any report shall constitute cause for revocation or suspension of any approval by the Commissioner, after a hearing upon prior notice of at least ten calendar days. For temporary approvals, the falsifying or misrepresentation of any fact in the application or in any report shall be cause for immediate revocation of such temporary approval by the Commissioner. However, notwithstanding the foregoing, when the public safety may be imminently jeopardized, or when a false report has been made, the Commissioner shall have the power, pending a hearing and determination of charges, to forthwith suspend any approval for a period not exceeding five calendar days.
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