A06_FOPO-186401-Long_Avenue_100__CD_Technical_Specifications_0003.pdf

Golden Gate National Recreation Area

Widen and Reconstruct Long Avenue for Safer Multi-Modal Access

FOPO 186401

FINAL CONSTRUCTION DOCUMENTS

PROJECT SPECIFICATIONS

NATIONAL PARK SERVICE

JULY 2025

FOPO 186401

Professional seals by Design Professionals and others responsible for preparing Construction Documents:

Sweet, Tom Typewriter Civil Engineer

Sweet, Tom Stamp

FOPO-186401 TOC - 1

TABLE OF CONTENTS

DIVISION 26 - ELECTRICAL No. of Pages 26 05 00 Common Work Results for Electrical……………………………………7

DIVISION 31 - EARTHWORK

31 14 00 Clearing, Grubbing, Selective Thinning and Tree Removal …………….5 31 22 13 Site and Roadway Excavation and Grading……………………………..11 31 23 33 Trenching and Backfill……………………………………………………5

DIVISION 32 - EXTERIOR IMPROVEMENTS

32 11 16 Base Course……………………………………………………………….7 32 12 13 Bituminous Prime Coat and Tack Coat…………………………………...7 32 12 16 Asphalt Paving………………………………………...…………………12 32 12 40 Stone Paving……………………………………………………...……….3 32 13 20 Site Concrete…………………………………………………….……….11 32 17 00 Paving Specialties…………………………………………………………6 32 31 00 Site Furnishings…………………………………………………………...6 32 31 13.13 Chainlink Fencing…………………………………………………………4

DIVISION 33 - UTILITIES

33 40 00 Concrete Drop Inlets and Catch Basins…………………………………...6

DIVISION 345 - TRANSPORTATION

34 71 13.16 Guardrails………………………………………………………………….3

FOPO-186401 26 05 00 – 1

COMMON WORK RESULTS FOR ELECTRICAL

SECTION 26 05 00 – COMMON WORK RESULTS FOR ELECTRICAL

PART 1 – GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Sectio n.

1.2 SUMMARY

A. Section Includes: Grounding rods, conduit, pull boxes, underground line warning tape requirements.

1.3 SUBMITTALS

A. Product Data: For each type of product indicated in accordance with DIVISION 1.

B. Informational Submittals: Plans showing dimensioned as-built locations of grounding features.

1. Ground rods.

2. Conduits and pull boxes.

3. Underground-line warning tape

1.4 QUALITY ASSURANCE

A. Comply with ANSI A13.1 and IEEE CE.

B. Comply with NFPA 70.

C. Comply with UL 467 for grounding and bonding materials and equipment.

D. Comply with UL 969 for identification.

PART 2 – PRODUCTS

2.1 Raceways

A. Conduit Materials:

1. Non-metallic conduit shall be rigid PVC electrical conduit extruded to schedule 40 dimensions of Type II. Grade 1 high impact, polyvinyl chloride, sweeps, couplings, reducers and terminating fittings shall be listed under the UL re-examination service, and shall bear the manufacturer's listed marking.

FOPO-186401 26 05 00 – 2

2. Where conduit enters a concrete foundation below grade, or ground water level, or where it is necessary to seal around a conduit where it passes through a concrete floor or wall, provide O-Z/Gedney Type FSK Thru Wall and Floor Seal, or equal.

2.2 UNDERGROUND CONCRETE PULL BOXES

A. Pre-cast concrete pull boxes. Concrete pull boxes shall be traffic type, reinforced for H-20 wheel loading, pre-cast concrete. Pull boxes shall be furnished with a one inch diameter ground rod knockout. In pull boxes, furnish and install cable racks on walls. Covers shall be marked as electrical, power, or signal as required. Pull boxes shall be as manufactured by Quickset, Christy or equal.

2.3 CONDUCTORS

A. Insulated Conductors: All copper wire or cable insulated for 600 V, type RHW in underground conduits unless otherwise required by applicable Code or authorities having jurisdiction. Wire sizes smaller than #6 AWG solid, sizes #6 and larger stranded. Wiring Devices: Receptacles 125-volt, 20-ampere specification grade comparable to Hubbell Cat. #5262, or approved equal, single phase, 3-wire, grounding type except as noted otherwise. Snap switches 125-volt, 15-ampere specification grade, silent type. Metal device plates.

2.4 CONNECTORS

A. Listed and labeled by an NRTL acceptable to authorities having jurisdiction for applications in which used and for specific types, sizes, and combinations of conductors and other items connected.

B. Bolted Connectors for Conductors and Pipes: Copper or copper alloy, pressure type with at least two bolts.

1. Pipe Connectors: Clamp type, sized for pipe.

C. Welded Connectors: Exothermic-welding kits of types recommended by kit manufacturer for materials being joined and installation conditions.

D. Bus-bar Connectors: Mechanical type, cast silicon bronze, solderless compression type wire terminals, and long-barrel, two-bolt connection to ground bus bar.

2.5 GROUNDING ELECTRODES

A. Ground Rods: Copper-clad steel; ¾ inch in diameter by 10 feet (19 mm by 3 m).

FOPO-186401 26 05 00 – 3

B. Chemical-Enhanced Grounding Electrodes: Copper tube, straight or L-shaped, charged with nonhazardous electrolytic chemical salts.

1. Termination: Factory-attached No. 4/0 AWG bare conductor at least 48 inches (1200 mm) long.

2. Backfill Material: Electrode manufacturer's recommended material.

2.6 CONDUCTOR IDENTIFICATION MATERIALS

A. Color-Coding Conductor Tape: Colored, self-adhesive vinyl tape not less than 3 mils (0.08 mm) thick by 1 to 2 inches (25 to 50 mm) wide.

B. Self-Adhesive Vinyl Labels: Preprinted, flexible label laminated with a clear, weather- and chemical-resistant coating and matching wraparound adhesive tape for securing ends of legend label.

2.7 UNDERGROUND-LINE WARNING TAPE

A. Tape:

1. Recommended by manufacturer for the method of installation and suitable to identify and locate underground electrical and communications utility lines.

2. Printing on tape shall be permanent and shall not be damaged by burial operations.

3. Tape material and ink shall be chemically inert, and not subject to degrading when exposed to acids, alkalis, and other destructive substances commonly found in soils.

B. Color and Printing:

1. Comply with ANSI Z535.1 through ANSI Z535.5.

2. Inscriptions for Red-Colored Tapes: ELECTRIC LINE, HIGH VOLTAGE.

3. Inscriptions for Orange-Colored Tapes: TELEPHONE CABLE, CATV CABLE, COMMUNICATIONS CABLE, OPTICAL FIBER CABLE.

C. Tag:

1. Pigmented polyolefin, bright-colored, ELECTRICAL compounded for direct-burial service.

2. Thickness: 4 mils (0.1 mm).

3. Weight: 18.5 lb/1000 sq. ft. (9.0 kg/100 sq. m).

4. 3-inch (75-mm) Tensile According to ASTM D 882: 30 lbf (133.4 N), and 2500 psi (17.2 MPa).

FOPO-186401 26 05 00 – 4

PART 3 – EXECUTION

3.1 EXCAVATION FOR TRENCH

A. Section 31 23 33 Trenching and Backfill.

3.2 CONDUIT INSTALLATION

A. General Requirements:

1. Provide complete and continuous systems of rigid conduit, outlet boxes, junction boxes, and fittings for systems of electrical wiring including power, and signal systems, except as otherwise specified.

2. Underground feeder distribution conduits for systems may be non-metallic conduit instead of rigid conduit except where otherwise specified or indicated.

3. Conduit shall be concealed unless otherwise indicated. Conduits exposed to view, except those in attic spaces and under buildings, shall be installed parallel or at right angles to structural members, walls, or lines of building. Conduits shall be installed to clear access openings.

B. Underground Requirements:

1. Conduits installed underground shall be entirely bedded in 3-inch bedding material on all sides with multiple conduits spaced not less than 3 inches apart, except where otherwise specified. Provide required conduit spacers to prevent any deflection of conduits when bedding is placed and to preserve position and alignment of conduits in backfill. Conduits shall be tied to spacers. Anchors shall be installed to prevent floating of conduits during placing of backfill.

2. Underground power conduits shall be buried to a depth of not less than 24 inches below finished grade to top of the conduit, unless otherwise specified. Underground medium voltage power conduits shall be buried to a depth of not less than 30 inches below finished grade to top of the conduit.

3. Assemble sections of conduit with required fittings and stagger joints. Cut ends of conduit shall be reamed to remove rough edges. Joints in conduits shall be provided liquid-tight.

Bends at risers shall be completely below surface where possible.

4. Conduits in a common trench shall be separated by at least 3 inches.

5. Non-metallic conduit installations shall comply with following additional requirements.

Joints in PVC conduit shall be sealed by means of required solvent-weld cement supplied by

FOPO-186401 26 05 00 – 5

conduit manufacturer. Non-metallic conduit bends and deflections shall comply with requirements of applicable electrical code, except that minimum radius of any bend or offset for conduits sized from 1/2 inch to 1-1/2 inches inclusive shall not be less than 24 inches.

Bends at risers and risers shall be PVC-coated rigid steel conduit or EMT if inside the structure. Radius of curve of bends or offsets in non-metallic conduit for public telephone system shall be not less than 10 times trade size of conduit, unless otherwise specifically permitted.

6. Furnish and install a 3-inch wide, polyethylene, red underground warning tape 12 inches above full length of conduit reading, "CAUTION ELECTRIC LINE BURIED BELOW".

7. In general, underground conduit systems provided for NPS shall be furnished to meet the requirements of PG&E.

8. Protect inside of conduit from dirt and rubbish during construction by capping openings.

3.3 APPLICATIONS

A. Underground Grounding Conductors: Install bare copper conductor, No. 2/0 AWG minimum.

1. Bury at least 24 inches (600 mm) below grade.

2. Duct-Bank Grounding Conductor: Bury 12 inches (300 mm) above duct bank when indicated as part of duct-bank installation.

B. Isolated Grounding Conductors: Green-colored insulation with continuous yellow stripe. On feeders with isolated ground, identify grounding conductor where visible to normal inspection, with alternating bands of green and yellow tape, with at least three bands of green and two bands of yellow.

C. Conductor Terminations and Connections:

1. Pipe and Equipment Grounding Conductor Terminations: Bolted connectors.

3.4 EQUIPMENT GROUNDING

A. Install insulated equipment grounding conductors with the following items, in addition to those required by NFPA 70:

1. Receptacle circuits.

2. Single-phase motor and appliance branch circuits.

FOPO-186401 26 05 00 – 6

3.5 INSTALLATION

A. Grounding Conductors: Route along shortest and straightest paths possible unless otherwise indicated or required by Code. Avoid obstructing access or placing conductors where they may be subjected to strain, impact, or damage.

B. Ground Bonding Common with Lightning Protection System: Comply with NFPA 780 and UL 96 when interconnecting with lightning protection system. Bond electrical power system ground directly to lightning protection system grounding conductor at closest point to electrical service grounding electrode. Use bonding conductor sized same as system grounding electrode conductor, and install in conduit.

C. Ground Rods: Drive rods until tops are 2 inches (50 mm) below final grade unless otherwise indicated.

1. Interconnect ground rods with grounding electrode conductor below grade and as otherwise indicated. Make connections without exposing steel or damaging coating if any.

3.6 BACKFILL

A. Section 31 23 33: TRENCHING AND BACKFILL. Do not place backfill until structure has been approved by the CO.

3.7 FIELD QUALITY CONTROL

A. Testing Agency: Engage a qualified testing agency to perform tests and inspections.

B. Tests and Inspections:

1. After installing grounding system but before permanent electrical circuits have been energized, test for compliance with requirements.

2. Inspect physical and mechanical condition. Verify tightness of accessible, bolted, electrical connections with a calibrated torque wrench according to manufacturer's written instructions.

3. Test completed grounding system at each location where a maximum ground-resistance level is specified, at service disconnect enclosure grounding terminal, at ground test wells, and at individual ground rods. Make tests at ground rods before any conductors are connected.

i. Measure ground resistance no fewer than two full days after last trace of precipitation and without soil being moistened by any means other than natural drainage or seepage

FOPO-186401 26 05 00 – 7

and without chemical treatment or other artificial means of reducing natural ground resistance.

ii. Perform tests by fall-of-potential method according to IEEE 81.

4. Prepare dimensioned Drawings locating each test well, ground rod and ground-rod assembly, and other grounding electrodes. Identify each by letter in alphabetical order, and key to the record of tests and observations. Include the number of rods driven and their depth at each location, and include observations of weather and other phenomena that may affect test results. Describe measures taken to improve test results.

C. Grounding system will be considered defective if it does not pass tests and inspections.

D. Prepare test and inspection reports.

E. Report measured ground resistances that exceed the following values:

1. Power Distribution Units or Panelboards Serving Electronic Equipment: 3 ohm(s).

F. Excessive Ground Resistance: If resistance to ground exceeds specified values, notify Presidio Trust Representative promptly and include recommendations to reduce ground resistance.

END OF SECTION 26 05 00

FOPO-186401 31 14 00 – 1

CLEARING, GRUBBING, SELECTIVE THINNING AND TREE REMOVAL

SECTION 31 14 00 – CLEARING, GRUBBING, SELECTIVE THINNING AND TREE REMOVAL

PART 1 – GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this section.

1.2 SCOPE OF WORK

A. Work included:

1. Protecting existing trees, shrubs, groundcover, and grass to remain.

2. Removing existing trees, shrubs, groundcover and grass.

3. Clearing and grubbing.

4. Stripping and stockpiling topsoil.

5. Removing above- and below-grade site improvements.

6. Temporary erosion and sedimentation control measures.

B. Related Sections include the following:

1. Division 01 Section Temporary Facilities and Controls for temporary utilities, temporary construction and support facilities, temporary security and protection facilities, and temporary erosion and sedimentation control procedures.

2. Division 01 Section Tree Preservation for protecting vegetation remaining on-site that are affected by site operations.

3. Division 02 Section Selective Site Demolition for demolition of pavement or structures undergoing alterations.

4. Division 31 Section Site and Roadway Excavation and Grading for soil materials, excavating, backfilling, and site grading.

1.3 DEFINITIONS

A. Topsoil: Natural or cultivated surface-soil layer containing organic matter and sand, silt, and clay particles; friable, pervious, and black or a darker shade of brown, gray, or red than underlying subsoil; reasonably free of subsoil, clay lumps, gravel, and other objects more than 2 inches (50 mm) in diameter; and free of subsoil and weeds, roots, toxic materials, or other nonsoil materials.

FOPO-186401 31 14 00 – 2

1.4 MATERIAL OWNERSHIP

A. Except for stripped topsoil or other materials indicated to remain on NPS property, cleared materials shall become Contractor's property and shall be removed from Project site.

1.5 SUBMITTALS

A. Photographs or videotape, sufficiently detailed, of existing conditions of trees and plantings, adjoining construction, and site improvements that might be misconstrued as damage caused by site clearing.

1.6 QUALITY ASSURANCE

A. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division 01 Section Quality Requirements.

1.7 PROJECT CONDITIONS

A. Traffic: Minimize interference with adjoining roads, streets, walks, and other adjacent occupied or used facilities during site-clearing operations.

1. Do not close or obstruct streets, walks, or other adjacent occupied or used facilities without permission from the Contracting Officer (CO) and authorities having jurisdiction.

2. Provide alternate routes around closed or obstructed traffic ways if required by authorities having jurisdiction.

B. Salvable Improvements: Carefully remove items indicated to be salvaged and store on Presidio Trust's premises where indicated.

C. Utility Locator Service: Notify utility locator service for area where Project is located before site clearing.

D. Do not commence site clearing operations until temporary erosion and sedimentation control measures are in place.

PART 2 – PRODUCTS (NOT USED)

PART 3 – EXECUTION

3.1 PREPARATION

A. Protect and maintain benchmarks and survey control points from disturbance during construction.

B. Locate and clearly flag vegetation to remain or to be relocated.

FOPO-186401 31 14 00 – 3

C. Protect existing site improvements to remain from damage during construction.

1. Restore damaged improvements to their original condition, as acceptable to Contracting Officer.

3.2 TEMPORARY EROSION AND SEDIMENTATION CONTROL

A. Provide temporary erosion and sedimentation control measures to prevent soil erosion and discharge of soil-bearing water runoff or airborne dust to adjacent properties and walkways.

B. Inspect, repair, and maintain erosion and sedimentation control measures during construction until permanent vegetation has been established.

C. Remove erosion and sedimentation controls and restore and stabilize areas disturbed during removal.

3.3 VEGETATION PROTECTION

A. Erect and maintain temporary fencing around vegetation protection zones before starting site clearing. Remove fence when construction is complete.

1. Do not store construction materials, debris, or excavated material within fenced area.

2. Do not permit vehicles, equipment, or foot traffic within fenced area.

3. Maintain fenced area free of weeds and trash.

B. Do not excavate within tree protection zones, unless otherwise indicated.

C. Where excavation for new construction is required within vegetation protection zones, hand clear and excavate to minimize damage to root systems. Use narrow-tine spading forks, comb soil to expose roots, and cleanly cut roots as close to excavation as possible.

1. Cover exposed roots with burlap and water regularly.

2. Temporarily support and protect roots from damage until they are permanently redirected and covered with soil.

3. Coat cut faces of roots more than 1-1/2 inches (38 mm) in diameter with an emulsified asphalt or other approved coating formulated for use on damaged plant tissues.

4. Backfill with soil as soon as possible.

FOPO-186401 31 14 00 – 4

D. Repair or replace vegetation indicated to remain that are damaged by construction operations, in a manner approved by CO.

1. Employ an arborist, licensed in jurisdiction where Project is located, to submit details of proposed repairs and to repair damage to trees and shrubs.

2. Replace vegetation that cannot be repaired and restored to full-growth status, as determined by CO.

3.4 CLEARING AND GRUBBING

A. Remove obstructions, shrubs, grass, and other vegetation to permit installation of new construction.

1. Do not remove shrubs, and other vegetation indicated to remain or to be relocated.

2. Cut minor roots and branches of vegetation indicated to remain in a clean and careful manner where such roots and branches obstruct installation of new construction.

3. Grind stumps and remove roots, obstructions, and debris extending to a depth of 24 inches (600 mm) below exposed subgrade as shown on typical plan detail.

B. Fill depressions caused by clearing and grubbing operations with satisfactory structural soil material unless further excavation or earthwork is indicated.

1. Place structural fill material in horizontal layers not exceeding a loose depth of 8 inches (200 mm), and compact each layer to a density equal to adjacent original ground.

3.5 TOPSOIL STRIPPING

A. Remove grass before stripping topsoil.

B. Strip topsoil to whatever depths are encountered in a manner to prevent intermingling with underlying subsoil or other waste materials.

1. Remove subsoil and nonsoil materials from topsoil, including trash, debris, weeds, roots, and other waste materials.

C. Stockpile topsoil materials away from edge of excavations without intermixing with subsoil. Grade and shape stockpiles to drain surface water. Cover to prevent windblown dust.

1. Limit height of topsoil stockpiles to 72 inches (1800 mm).

2. Do not stockpile topsoil within vegetation protection zones.

3. Dispose of excess topsoil as specified for waste material disposal.

4. Stockpile surplus topsoil to allow for respreading deeper topsoil.

FOPO-186401 31 14 00 – 5

3.6 DISPOSAL

A. Disposal: Remove surplus soil material, unsuitable topsoil, obstructions, demolished materials, and waste materials including trash and debris, and legally dispose of them off NPS property.

1. Separate recyclable materials produced during site clearing from other nonrecyclable materials. Store or stockpile without intermixing with other materials and transport them to recycling facilities.

END OF SECTION 31 14 00

FOPO-186401 31 22 13 – 1

SITE AND ROADWAY EXCAVATION AND GRADING

SECTION 31 22 13 – SITE AND ROADWAY EXCAVATION AND GRADING

PART 1 – GENERAL

1.1 The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO T 180 (2001; R 2004) Moisture-Density Relations of Soils Using a 4.54-kg (10-

lb) Rammer and an 457-mm (18-in) Drop

AASHTO T 224 (2001; R 2004) Correction for Coarse Particles in the Soil Compaction Test

ASTM INTERNATIONAL (ASTM)

ASTM A 252 (1998; R 2002) Standard Specification for Welded and Seamless Steel Pipe Piles

ASTM C 136 (2006) Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

ASTM C 33 (2003) Standard Specification for Concrete Aggregates

ASTM D 1140 (2000; R 2006) Amount of Material in Soils Finer than the No. 200 (75-micrometer) Sieve

ASTM D 1556 (2000) Density and Unit Weight of Soil in Place by the Sand-Cone Method

ASTM D 1557 (2002e1) Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3) (2700 kN-m/m3)

ASTM D 1883 (2005) CBR (California Bearing Ratio) of Laboratory-Compacted Soils

ASTM D 2487 (2006) Soils for Engineering Purposes (Unified Soil Classification System)

ASTM D 2937 (2004) Density of Soil in Place by the Drive-Cylinder Method

ASTM D 422 (1963; R 2002e1) Particle-Size Analysis of Soils

ASTM D 4318 (2005) Liquid Limit, Plastic Limit, and Plasticity Index of Soils

FOPO-186401 31 22 13 – 2

ASTM D 6938 (2007a) Standard Test Method for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth)

ASTM D 698 (2007e1) Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/cu. ft. (600 kN-m/cu. m.))

CALTRANS STANDARD SPECIFICATIONS (CTSS), 2024

Section 20 Landscape

Section 21 Erosion Control

1.2 DEFINITIONS

A. Satisfactory Materials: Satisfactory materials comprise any materials classified by ASTM D 2487 as GW, GP, GM, GP-GM, GW-GM, GC, GP-GC, GM-GC, SW, SP. Satisfactory materials for fill material for pavements which comprise stones less than 3 inches in any dimension.

B. Unsatisfactory Materials: Materials which do not comply with the requirements for satisfactory materials are unsatisfactory. Unsatisfactory materials also include man-made fills; trash; refuse;

backfills from previous construction; and material classified as satisfactory which contains root and other organic matter or frozen material. Notify the Contracting Officer (CO) when encountering any contaminated materials.

C. Cohesionless and Cohesive Materials: Cohesionless materials include materials classified in ASTM D2487 as GW, GP, SW, and SP. Cohesive materials include materials classified as GC, SC, ML, CL, MH, and CH. Materials classified as GM and SM will be identified as cohesionless only when the fines are nonplastic. Perform testing, required for classifying materials, in accordance with ASTM D4318, ASTM C136, ASTM D422, and ASTM D1140.

D. Degree of Compaction: Degree of compaction required, except as noted in the second sentence, is expressed as a percentage of the maximum density obtained by the test procedure presented in ASTM D 1557 abbreviated as a percent of laboratory maximum density. Since ASTM D 1557 applies only to soils that have 30 percent or less by weight of their particles retained on the 3/4 inch sieve, express the degree of compaction for material having more than 30 percent by weight of their particles retained on the 3/4 inch sieve as a percentage of the maximum density in accordance with AASHTO T 180 and corrected with AASHTO T 224. To maintain the same percentage of coarse material, use the "remove and replace" procedure as described in NOTE 8 of Paragraph 7.2 in AASHTO T 180.

FOPO-186401 31 22 13 – 3

E. Topsoil: Material suitable for topsoils obtained from onsite or offsite areas is defined as: Natural, friable soil representative of productive, well-drained soils in the area, free of subsoil, stumps, rocks larger than one inch diameter, brush, weeds, toxic substances, and other material detrimental to plant growth. Amend topsoil pH range to obtain a pH of 5.5 to 7. Topsoil to be amended per Contractor-provided amendment recommendations report prepared by a 3rd-party soils laboratory to result in appropriate growing media for native grass seed mix provided by the NPS (assumed to include agricultural gypsum, triple superphoshate, potassium and compost).

F. Hard/Unyielding Materials: Hard/Unyielding materials comprise weathered rock, dense consolidated deposits, or conglomerate materials which are not included in the definition of "rock" with stones greater than 3 inch in any dimension or as defined by the pipe manufacturer, whichever is smaller. These materials usually require the use of heavy excavation equipment, ripper teeth, or jack hammers for removal.

G. Rock: Solid homogeneous interlocking crystalline material with firmly cemented, laminated, or foliated masses or conglomerate deposits, neither of which can be removed without systematic drilling and blasting, drilling and the use of expansion jacks or feather wedges, or the use of backhoe-mounted pneumatic hole punchers or rock breakers; also large boulders, buried masonry, or concrete other than pavement exceeding 1/2 cubic yard in volume.

H. Unstable Material: Unstable materials are material too wet to properly support the roadway base or concrete ditch.

I. Select Granular Material: Select granular material consist of materials classified as GW, GP, SW, SP by ASTM D 2487. The liquid limit of such material must not exceed 35 percent when tested in accordance with ASTM D 4318. The plasticity index must not be greater than 12 percent when tested in accordance with ASTM D 4318, and not more than 35 percent by weight may be finer than No. 200 sieve when tested in accordance with ASTM D 1140.

J. Structural Fill: Fill material is Caltrans Class 2 material placed as road base or under the concrete ditch where needed.

1.3 SUBMITTALS

A. CO approval is required for submittals with a "G" designation; submittals not having a "G" designation are for information only. Submit the following in accordance with Section 01 33 23 Submittal Procedures:

1. SD-05 Soil Amendment Recommendation Report

FOPO-186401 31 22 13 – 4

i. Soil Laboratory Recommendations Report: G

2. SD-06 Test Reports

i. Testing; G

(1) Submit copies of all required test reports within 48 hours of test.

ii. Import Soil Test Report; G

(1) Report of imported material analysis.

3. SD-07 Certificates

i. Testing; G

(1) Qualifications of the commercial testing laboratory.

ii. Backfill material; G

PART 2 – PRODUCTS

2.1 REQUIREMENTS FOR OFFSITE SOILS

A. Commercial Fill Sources: Fill material including virgin and recycled from commercial brokers are exempt from testing requirements of this paragraph provided that documentation is provided from the commercial broker demonstrating that the commercial broker maintains a program for testing fill materials in accordance with CA DTSC guidelines.

B. Non-commercial Fill Sources: Each type of backfill soil imported from outside the Presidio, including Class II virgin and recycled aggregate base shall be tested for the following contaminants at the following frequency. Similar soil types imported from multiple sources or borrow sites shall be tested separately. Imported soil shall not exceed the hazardous waste criteria of State of California Title 22. Do not bring material onsite until tests have been approved by the CO.

Imported soil shall be analyzed for the following constituents:

1. VOCs, including MTBE4 and TPH – G5 (EPA Method 8260B);

2. SVOCs (EPA Method 8270C);

3. Organochlorine Pesticides (EPA Method 8081);

4. PCBs (EPA Method 8082);

5. TPH – D and MO7 (EPA Method 8015M);

6. Asbestos (EPA Method 600/R-93-116);

FOPO-186401 31 22 13 – 5

7. Chromium +6 (EPA Method 7199); and

8. 17 CAM metals (EPA Method 6000/7000 series): – antimony (EPA Method 6010B);

i. arsenic (EPA Method 200.8);

ii. barium (EPA Method 6010B);

iii. beryllium (EPA Method 6010B);

iv. cadmium (EPA Method 6010B);

v. chromium (EPA Method 6010B);

vi. cobalt (EPA Method 6010B);

vii. copper (EPA Method 6010B);

viii. lead (EPA Method 6010B);

ix. mercury (EPA Method 7470A);

x. nickel (EPA Method 6010B);

xi. selenium (EPA Method 6010B);

xii. silver (EPA Method 6010B);

xiii. thallium (EPA Method 6010B);

xiv. tin (EPA Method 6010B);

xv. vanadium (EPA Method 6010B); and

xvi. zinc (EPA Method 6010B).

C. Samples shall be taken and tested per CA DTSC guidelines as follows:

Volume of Import Material Samples per Volume

Up to 1000 cubic yards 1 sample per 250 cubic yards

1000 to 5000 cubic yards 4 samples for first 1000 cubic yards + 1 sample per each additional 500 cubic yards

Greater than 5000 cubic yards 12 samples for first 5000 cubic yards + 1 sample per each additional 1000 cubic yards

2.2 BACKFILL MATERIAL

A. Backfill Material for General Excavations

1. Excavations in Roadway, Ditch and Paved Areas: For general excavation and backfill for the roadway and under the concrete ditch must be imported material meeting the

FOPO-186401 31 22 13 – 6

requirements for Structural Fill. Backfill in areas adjacent to the roadway under the guardrail and beyond the fence must meet requirements for Select Granular or Satisfactory Materials.

PART 3 – EXECUTION

3.1 STRIPPING OF TOPSOIL

A. Where indicated or directed, strip topsoil to a depth of 4 inches below finish grade. Spread topsoil on areas already graded, scarified to a depth of 12-inches and prepared for topsoil, or transported and deposited in stockpiles convenient to areas that are to receive application of the topsoil later, or at locations indicated or specified. Keep topsoil separate from other excavated materials, brush, litter, objectionable weeds, roots, stones larger than 2 inch in diameter, and other materials that would interfere with planting and maintenance operations. Coordinate the disposition of excess topsoil with the Contracting Officer and deliver to the location as directed.

3.2 GENERAL EXCAVATION

A. Perform excavation of every type of material encountered within the limits of the project to the lines, grades, and elevations as indicated and as specified. Over-excavation performed in the normal course of work not associated with unknown or changed conditions, including but not limited to sloughing of the trench walls and over-excavation at contractors convenience shall not constitute a change to the contract price. Perform grading in accordance with the typical sections shown on the drawings. Excavate unsatisfactory materials encountered within the limits of the work below grade and replace with satisfactory materials. Dispose surplus satisfactory excavated material not required for fill off site. Dispose unsatisfactory excavated material off site. During construction, perform excavation and fill in a manner and sequence that will provide proper drainage at all times.

B. The Contractor shall relocate, reconstruct, replace or repair, at his own expense, all improvements which are in the line of construction or which may be damaged, removed, disrupted or otherwise disturbed by the Contractor. Except as specified in other Sections or shown on the Contract Drawings, this provision applies to all surface improvements of whatever nature such as walls, fences, above-grade utilities, landscaping, paving, structures, or other physical features whether shown on the Contract Drawings or not and to all subsurface improvements such as utilities which are indicated on the Contract Drawings or marked in the field. The Contractor shall connect such utilities to existing systems and leave all in a workable and operating condition. The cost of this work shall be considered as included in other items of work and no additional compensation will be allowed therefore.

FOPO-186401 31 22 13 – 7

C. Ditch Excavation: Make excavations to the lines, grades, and elevations shown, or as directed.

Provide excavation of sufficient size to permit the placement and removal of forms for the full length and width of concrete ditch as shown. Clean rock or other hard foundation material of loose debris and cut to a firm, level, stepped, or serrated surface. Remove loose disintegrated rock and thin strata. Do not disturb the bottom of the excavation. Do not excavate to the final grade level until just before the concrete is to be placed.

D. Drainage: Provide for the collection and disposal of surface and subsurface water encountered during construction. Completely drain construction site during periods of construction to keep soil materials sufficiently dry. Construct storm drainage features (ponds/basins) at the earliest stages of site development, and throughout construction grade the construction area to provide positive surface water runoff away from the construction activity or provide temporary ditches, swales, and other drainage features and equipment as required to maintain dry soils. When unsuitable working platforms for equipment operation and unsuitable soil support for subsequent construction features develop, remove unsuitable material and provide new soil material as specified herein. It is the responsibility of the Contractor to assess the soil and ground water conditions presented by the plans and specifications and to employ necessary measures to permit construction to proceed.

E. Dewatering: Control groundwater flowing toward or into excavations to prevent sloughing of excavation slopes and walls and heave in the excavation and to eliminate interference with orderly progress of construction. While the excavation is open, maintain the water level continuously, at least 1 foot below the working level.

1. Dewatering equipment necessary to drain and keep excavations free of water under all circumstances shall be provided, operated, and removed by the Contractor.

2. Contractor shall obtain CO approval of proposed method of dewatering.

3. Surface water shall be prevented from flowing into excavations. Accumulated water shall be promptly removed.

4. The dewatering system shall be maintained in place until construction work is completed.

5. Discharge water quality to meet applicable SFPUC, NPS and/or RWQCB requirements (depending on location(s) of discharge). For more detail related to stormwater discharge see Section 01 57 23 "Under-An-Acre Pollution Prevention."

F. Excavation Requirements: Excavate for the concrete ditch to the width and depth shown on the applicable drawing details. Typically ditch excavation walls shall be cut vertically where allowable by safety regulations or soil characteristics.

FOPO-186401 31 22 13 – 8

G. Removal of Unyielding Material: Where unyielding material is encountered in the bottom of the excavation for the ditch or roadway, remove such material 3 inch below the required grade and replace with structural fill material.

H. Removal of Unstable Material: When unstable material is encountered in the ditch or roadway excavation notify the CO immediately. The CO shall assess the situation and provide direction on alternate installation requirements depending on the situation encountered.

When removal of unstable material is required due to the Contractor's fault or neglect in performing the work, the Contractor is responsible for excavating the resulting material and replacing it without additional cost to the Government.

I. Underground Utilities: The Contractor is responsible for movement of construction machinery and equipment over pipes and utilities that may be present during construction. For work immediately adjacent to or for excavations exposing a utility or other buried obstruction, excavate by hand. Start hand excavation on each side of the indicated obstruction and continue until the obstruction is uncovered or until clearance for the new grade is assured. Support uncovered lines or other existing work affected by the contract excavation until approval for backfill is granted by the CO’s Technical Representative. Report damage to utility lines immediately to the CO. No additional compensation will be made for construction impacts due to utilities shown on the drawings. No additional compensation will be made for repair of damaged utilities marked prior to start of work, regardless of whether or not they were shown on the contract drawings.

3.3 GROUND SURFACE PREPARATION AT ROADWAY

A. General Requirements: Remove and replace unsatisfactory material with satisfactory materials in excavated areas. When subgrades are less than the specified density, break up the ground surface to a minimum depth of 6 inch, pulverizing, and compacting to the specified density.

B. Base: Place Class 2 aggregate base rock in 6-inch maximum loose lifts compacted to a minimum 95 percent relative compaction using vibratory drum roller compaction equipment. For more detail see Section 32 11 16 Base Course.

C. Final Backfill: Backfill excavations to the grade shown. Backfill excavations shall not commence under any circumstance until required inspections are requested by the contractor and performed by the CO’s Technical Representative. No additional compensation will be made if Contractor shall be responsible for all costs to expose, backfill and re-compact excavations in the event corrective action must be taken due to failed tests.

Place backfill material and compact as follows:

FOPO-186401 31 22 13 – 9

1. Roadway Areas: Place structural backfill up to the required elevation as specified. Place backfill and compact in lifts not to exceed 5 inches and compact to minimum 95 percent maximum density. Compact subgrade areas not requiring filling to minimum 95 percent maximum density. Water flooding or jetting methods of compaction are not allowed.

2. Guardrail and Fence Areas: Backfill in areas adjacent to the roadway under the guardrail to and under the fence to the construction limits must meet requirements for Select Granular or Satisfactory Materials.

3. Vegetated and Seeded Areas: Deposit topsoil in layers of a maximum of 6-inch loose thickness, and compact 85 percent maximum density. Water flooding or jetting methods of compaction are not allowed. Apply this requirement to all other areas not specifically designated above.

3.4 FINISHING

A. Finish the surface of excavations and subgrades to a smooth and compact surface in accordance with the lines, grades, and cross sections or elevations shown. Provide the degree of finish for graded areas within 0.1 foot of the grades and elevations indicated except that the degree of finish for subgrades specified in paragraph SUBGRADE PREPARATION. Finish the surface of areas to be turfed from settlement or washing to a smoothness suitable for the application of turfing materials. Repair graded, topsoiled, or backfilled areas prior to acceptance of the work, and re-established grades to the required elevations and slopes.

B. Subgrade and Embankments: During construction, keep excavations shaped and drained. Maintain ditches and drains along subgrade to drain effectively at all times. Do not disturb the finished subgrade by traffic or other operation. The Contractor is responsible for protecting and maintaining the finished subgrade in a satisfactory condition until subbase, base, or pavement is placed. Do not permit the storage or stockpiling of materials on the finished subgrade.

3.5 PLACING TOPSOIL

A. On areas to receive topsoil, prepare and scarify the compacted subgrade soil to a 12-inch depth with a hydraulic rake with tines 12-inches apart for bonding of topsoil with subsoil. Contractor to spread 2 to 3-inches of salvaged topsoil and incorporate to a 6-inch depth by roto-tilling. Contractor to then place a 4-inch thickness of salvaged topsoil and rototill with soil amendments to result in 6-inches of topsoil and grade to the elevations and slopes shown. Contractor to have sample of site topsoil analyzed by a soil laboratory for amendment recommendations. Contractor to assume incorporation of agricultural gypsum, triple superphosphate, potassium and compost. Do not spread

FOPO-186401 31 22 13 – 10

topsoil when excessively wet or dry. Obtain material required for topsoil in excess of that produced by excavation within the grading limits or from offsite areas. Contractor to spread native seed provided by the NPS over the areas designated as Planted Areas on the construction drawings.

Contractor to provide and install Type B erosion control blanket and wattles (fiber rolls) as shown on the construction drawings. Contractor to provide and apply organic fertilizer and temporary watering until seeds have germinated (up to 60 days after placement) per Caltrans Sections 20 Landscaping and 21 Erosion Control.

3.6 TESTING

A. Contractor shall pay the cost for and perform testing indicated in this specification. Perform testing by a certified commercial testing laboratory. Determine field in-place density in accordance with ASTM D 1556 or ASTM D 6938. When ASTM D 6938 is used, check the calibration curves and adjust using only the sand cone method as described in ASTM D 1556. ASTM D 6938 results in a wet unit weight of soil in determining the moisture content of the soil when using this method.

Check the calibration curves furnished with the moisture gauges along with density calibration checks as described in ASTM D 6938; check the calibration of both the density and moisture gauges at the beginning of a job on each different type of material encountered and at intervals as directed by the Contracting Officer’s Technical Representative. When test results indicate that compaction is not as specified, remove the material, replace and recompact to meet specification requirements. Perform tests on recompacted areas to determine conformance with specification requirements. Appoint a registered professional civil engineer to certify inspections and test results.

These certifications shall state that the tests and observations were performed by or under the direct supervision of the engineer and that the results are representative of the materials or conditions being certified by the tests. The following number of tests, if performed at the appropriate time, will be the minimum acceptable for each type operation.

B. Fill and Backfill Material Gradation: One test per 10 cubic yards stockpiled or in-place source material. Determine gradation of fill and backfill material in accordance with ASTM C 136.

C. In-Place Densities (minimum 95 percent maximum density): Testing of in-place densities shall occur as follows:

D. Moisture Contents: In the stockpile, excavation, or borrow areas, perform a minimum of one test per day per type of material or source of material being placed during stable weather conditions.

During unstable weather, perform tests as dictated by local conditions and approved by the CO.

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E. Optimum Moisture and Laboratory Maximum Density: Perform tests for each type material or source of material including borrow material to determine the optimum moisture and laboratory maximum density values. One representative test per 10 cubic yards of fill and backfill, or when any change in material occurs which may affect the optimum moisture content or laboratory maximum density.

F. Tolerance Tests for Subgrades: Perform continuous checks on the degree of finish specified in paragraph SUBGRADE PREPARATION during construction of the subgrades.

3.7 FIELD QUALITY CONTROL

A. All excavation, filling, and compaction shall be performed under the direct observation of the CO Representative. The Contractor shall cooperate with the CO Representative in all aspects of the work. Any materials placed or improvements constructed in the absence of the CO Representative's approval to proceed shall be presumed to be defective and, at the discretion of the CO Representative shall be removed and replaced at no cost to the NPS. The CO Representative shall be notified at least 4 working days prior to required observation or testing.

B. Finish soil grade tolerance at the completion of grading:

1. Paved areas: +0 to ±0.01 feet.

2. Other areas: +0 to ±0.02 feet

END OF SECTION 31 22 13

FOPO-186401 31 23 33 – 1

TRENCHING AND BACKFILL

SECTION 31 23 33 – TRENCHING AND BACKFILL

PART 1 – GENERAL

1.1 SUMMARY

A. Work included in this section:

1. Trenching and backfilling for underground utilities.

2. Furnishing and installing utility line marking.

1.2 SUBMITTALS

A. Certificates and data.

1. Select backfill material.

2. Certificate of compliance for pipe base and pipe zone materials.

3. Independent testing and laboratory reports: submit results of specified tests.

B. Samples: 24–inch stripes of utility marking tape.

1.3 QUALITY ASSURANCE

A. California Department of Transportation (CDT):

1. Standard Specifications.

2. Standard Test Methods: No. 202.

B. CAL/OSHA Construction Safety Orders.

C. Testing shall be provided by an independent testing agency at the expense of the Contractor and approved by the Contracting Officer (CO).

PART 2 – PRODUCTS

2.1 SELECT BACKFILL MATERIAL

A. Select backfill shall be granular, free from clay or organic matter with the following criteria:

1. Maximum Plasticity Index: 10

2. Maximum Particle Size: 2 inches

3. Percent Passing No. 200 Sieve: 10 to 20%

4. Minimum R-Value: 20

FOPO-186401 31 23 33 – 2

B. Bedding Material:

1. Shall be clean, sound, and durable natural sand.

2. When material passing a No. 4 mesh sieve is placed in a soil resistivity box and covered with distilled water, resistivity shall not be less than 200 ohm-centimeters, and pH shall be between 6 and 8.

3. Shall have a sand equivalent of not less than 30 as determined by California Test 217.

2.2 MARKING TAPE

A. Capable of being inductively detected electronically.

B. Construction: Metallic foil laminated between two layers of impervious plastic film not less than 3 inches wide. Total thickness of tape shall not be less than 0.005 inch (5 mil) plus or minus 10 percent manufacturing tolerances.

1. Film: Inert plastic. Each film layer shall be not less than 0.0005 inch thick (0.5 mil).

2. Foil: Not less than 0.00035 inch thick (0.035 mil).

3. Adhesive: Compatible with foil and film.

C. Imprint: 3/4-inch or larger bold black letters.

D. Legend: Identify buried utility line tape with imprint such as “Caution: Sewer Line Below.” Repeat identification at approximately 24-inch intervals.

E. Background Color: APWA color code and as specified below:

Color Utility

Safety Red Electric

High Visibility Safety Yellow Gas, Oil, Steam, Dangerous Materials

Safety Alert Orange Telephone, Communications, Cable Television

Safety Precaution Blue Water System, Irrigation

Safety Green Sanitary Sewer, Storm Sewer

Safety Brown Force Mains, Reclaimed Water, and Effluent Lines

F. Manufacturer: Lineguard, Inc., Wheaton, Illinois; Reef Industries, Inc., Houston, Texas; Thor Enterprises, Inc., Sun Prairie, Wisconsin; or approved equivalent.

FOPO-186401 31 23 33 – 3

PART 3 – EXECUTION

3.1 PREPARATION

A. General:

1. Prior to trenching, the Contractor shall perform a full underground utility survey.

3.2 TRENCH EXCAVATION

A. General:

1. Excavation shall include removal of all water and materials that interfere with construction.

2. Excavation shall include the construction and maintenance of bridges required for vehicular and pedestrian traffic, support for adjoining utilities.

3. It shall be the Contractor's responsibility to direct vehicular and pedestrian traffic through or around his work area at all times.

4. The Contractor shall relocate, reconstruct, replace or repair, at his own expense, all improvements which are in the line of construction or which may be damaged, removed, disrupted or otherwise disturbed by the Contractor. Except as specified in other Sections or shown on the Contract Drawings, this provision applies to all surface improvements of whatever nature such as walls, fences, above-grade utilities, landscaping, paving, structures, or other physical features whether shown on the Contract Drawings or not and to all subsurface improvements such as utilities which are indicated on the Contract Drawings or marked in the field. The Contractor shall connect such utilities to existing systems and leave all in a workable and operating condition. The cost of this work shall be considered as included in other items of work and no additional compensation will be allowed therefore.

B. Existing Paving and Concrete:

1. Existing pavement over trench shall be sawcut, removed, and hauled away from the job.

Existing pavement shall be neatly sawcut along the limits of excavations. If a longitudinal pavement joint or edge of pavement is located within three feet of the limit of excavation, all intervening pavement shall be removed and replaced after completion of backfilling.

2. Existing concrete over the trench shall be sawcut to a full depth in straight lines either parallel to the curb or a right angle to the alignment of the sidewalk. No section to be replaced shall be smaller than 30 inches in either length or width.