(C) INSTALLATION IN PRECAST CONCRETE
(1) The F.R.P. LINERS shall be cast integral with the precast concrete wetwell riser and flat top slab sections in accordance with the liner manufacturer's specifications. The liner must be fully supported during the casting process; lifting devices shall not penetrate inside walls of wetwell or F.R.P. liner.
(2) Inside F.R.P. liner surfaces shall be free of bulges, dents and other defects that result in a variation of inside diameter of more than 1/2" (13 mm). The precast concrete wetwell section joint surfaces shall be parallel and free of excess concrete at external and internal joints to insure proper seal of structure sections and F.R.P liner.

(D) FIELD ASSEMBLY AND INSPECTION PRECAST CONCRETE WETWELL WITH F.R.P. LINER
(1) During the field installation of F.R.P. lined precast wetwell sections, all internal seams are to be sealed per the liner manufacturer's standard method and details, to include the use of approved butyl sealant strips (ASTM C-990 Section 6.2) at internal liner joint flange. Outer joints of precast concrete sections shall be sealed as prescribed by precast manufacturer and utility specifications.
(2) After structure assembly is complete, the interior surfaces of the liner shall be completely free from pinholes, cracks, pits or defects, which are detrimental to the intended use of the liner. No F.R.P. liner shall have holes, or openings, which will permit the passage of liquid or gases through the liner wall to precast concrete. There shall be no exposed concrete mortar through or between the inside liner surface to include (but not limited to) pipe penetrations, precast section joints or metal hatch frame / cast iron cover ring joint / seams. All mechanical anchor attachments through liner surfaces must be sealed with an approved elastomeric sealant. Consult liner manufacturer for specific information regarding approved sealant supplier list and availability.

PROTECTIVE LINER
GU FIBERGLASS REINFORCED PLASTIC (F.R.P.)
CONCRETE PROTECTIVE LINER

Scope: Furnish fiberglass reinforced plastic (F.R.P.) of polyurethane hybrid polymer resin to be installed in sanitary sewer manholes and lift station/ wetwells as a protective surface barrier. The F.R.P. polyurethane hybrid polymer liner shall be a non load-bearing component, which is resistant to the chemical environment normally found in wastewater collection systems. The liner shall be prefabricated rigid F.R.P. sections of unlayered homogeneous composite with an aggregate coated outer surface to insure adequate mechanical anchoring of F.R.P. liner to concrete/ grout in sanitary sewer structures.

2.0 Materials: F.R.P. Polyurethane Hybrid Polymer Composite 2.1 Minimum Thickness: (A) Integrally cast in new precast concrete structures Minimum thickness 3/16" (5 mm) (B) Field installed rehab/ retrofit into existing sanitary manholes Minimum thickness 1/4" (7 mm) 2.2 Material Properties (A) Fiberglass (Type E Glass) Minimum length of fibers = 0.625 inches Content by weight 12% - 15% (B) Inert Filler Content by weight 10% - 13% (C) Bonding aggregate - prewashed, kiln dried, fractured 3/8" gravel Graded particle size minimum 3/16" and maximum 3/8" Rate of application - 3.5 lb/ sq ft

2.3 Physical Properties (A) Abrasion resistance - Falling Sand (ASTM D968) Thickness of material removed passes Passes 0-5 5-10 10-15 15-20 20-25 Total for 25 passes Thickness removed .04 mil 0.04 mil 0.6 mil 0.04 mil 0.12 mil 1.2 mil (B) Density of F.R.P. Polyurethane Hybrid Composite (ASTM D1622) - 1.17g/cm3 (C) Shore "A" Hardness Durometer (ASTM D2240) - Exceeds 90 on scale (D) Percolation Test - Water absorption of top surface - 0.032% (E) Thermal shock (CSA-B45-M93) 100 thermal cycles- no sign of surface defects 2.4 Chemical Resistance (A) Chemical Resistance (Selected Reagents) (ASTM D1308) Nitric Acid 69% No surface Degradation - Surface Staining Hydrochloric Acid 60% No surface Degradation Ammonia 28% No surface Degradation Sodium Hydroxide 5.25% No surface Degradation Sulfuric Acid 50% No surface Degradation Sulphuric Acid 70% No surface Degradation Sulphuric Acid 80% No surface Degradation Acetone No surface Degradation Unleaded Gasoline No surface Degradation Turpentine No surface Degradation (B) Acetone Immersion (ASTM. D2152) - No attack NOTE: For comprehensive Precast or Rehab/ Retrofit liner specifications refer to GU Fiberglass Plastic Liner Specifications for GU F.R.P. Manhole Base Liner, GU F.R.P. Manhole Liner, GU F.R.P. Wetwell Liner and GU F.R.P. Rehab Liner.