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DRAFT FINAL

DRAFT FINAL REPORT

BASELINE MOLD SURVEY

BELMONT LEARNING COMPLEX

1101 WEST 1ST STREET

LOS ANGELES, CALIFORNIA 90012

This Baseline Mold Survey Report for the Belmont Learning Complex (BLC) was

prepared by URS Corporation on behalf of the Los Angeles Unified School District in a

manner consistent with the level of care and skill ordinarily exercised by professional

engineers, geologists, and environmental scientists. This investigation was conducted

under the technical direction of James D. Hollingshead, a Certified Industrial Hygienist

(CIH).

URS Corporation

Debra Stott, RG Brian Jacobs, RG, RHG, REA IIPrincipal Geologist LAUSD Program ManagerMarch 26, 2003 March 26, 2003

TABLE OF CONTENTS

Section Page


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EXECUTIVE SUMMARY .............................................................................................. 1

1.0 INTRODUCTION..................................................................................................... 1

1.1 PURPOSE AND SCOPE OF SERVICES............................................................. 1

2.0 SITE DESCRIPTION............................................................................................... 2

2.1 LOCATION........................................................................................................... 2

2.2 SITE HISTORY AND BACKGROUND INFORMATION................................. 2

2.3 CURRENT SITE CONDITIONS.......................................................................... 2

3.0 SUMMARY OF INVESTIGATION ACTIVITIES .............................................. 4

3.1 SAMPLING AND DEMOLITION OF MOCK-UP CLASSROOMS.................. 4

3.2 SORTING AND CATEGORIZATION OF STOCKPILED MATERIALS......... 4

3.3 BASELINE MOLD SURVEY.............................................................................. 5

4.0 SUMMARY OF FINDINGS .................................................................................... 6

4.1 ACADEMY HOUSE 1 .......................................................................................... 6

4.2 ACADEMY HOUSE 2 .......................................................................................... 7

4.3 ACADEMY HOUSE 3 .......................................................................................... 8

4.4 ACADEMY HOUSE 4 .......................................................................................... 9

4.5 ADMINISTRATION CENTER .......................................................................... 10

4.6 PARKING GARAGE.......................................................................................... 11

4.7 LOCKER ROOMS.............................................................................................. 12

4.8 TRIPLE GYM ..................................................................................................... 13

5.0 CONCLUSIONS AND RECOMMENDATIONS................................................ 13

5.1 ACADEMY HOUSE 1 ........................................................................................ 15

5.2 ACADEMY HOUSE 2 ........................................................................................ 15

5.3 ACADEMY HOUSE 3 ........................................................................................ 16

5.4 ACADEMY HOUSE 4 ........................................................................................ 16

5.5 ADMINISTRATION CENTER .......................................................................... 17

5.6 PARKING GARAGE.......................................................................................... 18

5.7 LOCKER ROOMS.............................................................................................. 18

5.8 TRIPLE GYM ..................................................................................................... 18

TABLE OF CONTENTS(continued)

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6.0 REMOVAL OF CONTAMINATED MATERIALS ........................................... 19

7.0 LIMITATIONS AND EXCEPTIONS OF THE MOLD SURVEY ................... 20

REFERENCES................................................................................................................ 21

FIGURES

Figure 1 – Site Vicinity Map

Figure 2 – Site Plan

Figure 3A – Mold Survey Sampling Locations, Academy House 1, First Floor

Figure 3B – Mold Survey Sampling Locations, Academy House 1, Second Floor

Figure 3C – Mold Survey Sampling Locations, Academy House 1, Third Floor

Figure 3D - Mold Survey Sampling Locations, Academy House 1, Roof Level




Figure 4D – Mold Survey Sampling Locations, Academy House 2, Roof Level









Figure 7A – Mold Survey Sampling Locations, Administration Center, First Floor

Figure 7B – Mold Survey Sampling Locations, Administration Center, Second Floor

Figure 7C – Mold Survey Sampling Locations, Administration Center, Roof Level

Figure 8A – Mold Survey Sampling Locations, Parking Garage, First Floor

Figure 8B – Mold Survey Sampling Locations, Parking Garage, Second Floor

Figure 8C – Mold Survey Sampling Locations, Parking Garage, Third Floor

TABLE OF CONTENTS(continued)


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FIGURES (continued)

Figure 9A – Mold Survey Sampling Locations, Locker Rooms, First Floor

Figure 9B – Mold Survey Sampling Locations, Locker Rooms, Roof Level

Figure 10 – Mold Survey Sampling Locations, Triple Gym, Roof Level

TABLES

Table 1 – Mold Survey Visual Inspection

Table 2 – Mold Survey Analytical Results

Table 3 – Mold Survey Remediation Summary

APPENDICES

Appendix A – Photographs of Sampling Locations

Appendix B – Laboratory Data Reports

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EXECUTIVE SUMMARY

Presented in this draft final report are the results of the Baseline Mold Survey conducted at

the Belmont Learning Complex (BLC or Site), located in the City of Los Angeles, County

of Los Angeles, California. This report was prepared by URS Corporation (URS) on behalf

of the Los Angeles Unified School District (LAUSD). The Baseline Mold Survey was

conducted in accordance with the proposals between URS and LAUSD dated August 28,

2002 and September 20, 2002.

The purpose of the Baseline Mold Survey was to evaluate the presence of mold in existing

structures, building materials, building components, and stockpiled construction materials

at the BLC. The project objective was addressed through a scope of services that consisted

of a visual inspection of the entire Site, the collection and analysis of bulk and tape lift

samples of various building/construction materials to determine the presence of mold, the

sampling and demolition of two mock-up classrooms, and the sorting and categorization of

stockpiled construction materials to determine materials that should be discarded and the

materials that are salvageable with proper cleaning procedures.

The Belmont Learning Complex (BLC or Site) is located at 1101 West 1st Street, in the City

of Los Angeles, County of Los Angeles, California (Figure 1). The L-shaped Site is

approximately 34 acres in size and is bordered by Colton Street and Boylston Street to the

north, Temple Street to the northeast, Toluca Street to the northwest, Beaudry Avenue to

the southeast, and 1st Street to the southwest. Structures currently located at the BLC

include Academy Houses 1 through 4, the Administration Center, the Parking Garage, the

Locker Rooms, and the Triple Gym. Each of these on-Site structures is at different levels

of completion.

Two mock-up classrooms were located within Segment A on Level 1 of the Parking

Garage. Visible mold growth was noted on the walls of both classrooms. On September

18, 2002, two drywall samples (MOCKUP-1B and MOCKUP-2B) were collected from the

two mock-up classrooms and analytical results confirmed mold growth. At the request of

LAUSD, the mock-up classrooms were demolished by Aman Environmental (a subsidiary

of URS) on September 19 and 20, 2002. All demolition materials were lawfully disposed

off site.

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Stockpiled construction materials were observed in all structures at the Site. From

September 16 through 19, 2002, Aman Environmental sorted and categorized all the stored

construction materials to determine the materials that should be discarded and the materials

that were salvageable with proper cleaning procedures. Due to prolonged exposure, some

materials had evidence of mold growth, water damage, or water staining and some were

covered with dust or bird droppings. Many of these materials were marked for removal.

Other materials, such as conduits and other metal objects, were salvageable with proper

cleaning procedures, and thus, were appropriately marked.

Based on the results of the Baseline Mold Survey, mold was detected in specific

areas/materials at the BLC. Below is a summary of recommendations for each of these

areas/materials.

Ventilation Ductwork: Samples collected from sealed and unsealed, flex and rigid

ductwork indicate the presence of various types of fungal growth and spores. As a result of

these findings, it is recommended that all of the ductwork at the Site, whether installed or

stored, be cleaned to a condition similar to that of new ductwork or removed and replaced

with new ductwork. Based on experience, ductwork with interior insulation and/or

corrugated surfaces typically cannot be cleaned to a new condition.

Fiberglass Insulation: Exposed fiberglass insulation or similar fire safing materials were

observed throughout Site structures. Over time these materials have collected significant

quantities of dust and biological materials including mold spores. All exposed fiberglass

insulation and fire safing materials should be removed and replaced prior to installation of

additional drywall.

Drywall: Various locations within the Academy Houses, the Administration Center, and

the Parking Garage were water stained or had visible mold growth. These areas were

identified with orange spray paint and many were sampled. Sample results indicate that

various types of mold spores and mold growth were present. These areas should be

removed along with all associated fiberglass insulation and fire safing materials. Minimum

quantities of drywall to be removed at each area are noted in Table 3. Because these

quantities are approximates, additional drywall and insulation that bears evidence of water

staining, water damage or mold growth should be removed and may affect the final

removed quantity.

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Dens Glass Board: Mold was detected in several areas of exposed Dens-Glass board,

specifically within the Academy Houses. The assumption that all of this material would be

removed as part of the reconstruction of the BLC is reinforced by the results of the samples

collected from this material.

Roofs: Upon completion of all interior mold remediation work, all of the roof-mounted

HVAC units on the Academy Houses, the Triple Gym, the Administration Center, and the

Locker Rooms should have the filters replaced and normal maintenance should be

performed.

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1.0 INTRODUCTION

Presented in this draft final report are the results of the Baseline Mold Survey conducted at

the Belmont Learning Complex (BLC or Site), located in the City of Los Angeles, County

of Los Angeles, California. This report was prepared by URS Corporation (URS) on behalf

of the Los Angeles Unified School District (LAUSD). The Baseline Mold Survey was

conducted in accordance with the proposals between URS and LAUSD dated August 28,

2002 and September 20, 2002.

1.1 PURPOSE AND SCOPE OF SERVICES

The purpose of the Baseline Mold Survey was to evaluate the potential presence of mold in

existing structures, building materials, building components, and stockpiled construction

materials at the BLC.

The project objective was addressed through a scope of services that consisted of the

following.

• Health and Safety Plan Preparation – A site-specific Health and Safety Plan was

prepared for the field investigation activities described herein.

• Sampling and Demolition of the Two Mock-Up Classrooms – Two bulk samples were collected from the walls of the mock-up classrooms and analyzed for the

presence of mold. The mock-up classrooms were demolished on September 19 and

20, 2002. All demolition materials were lawfully disposed off site. Refer to Section

3.1 for a further discussion.

• Sorting and Categorization of Stockpiled Construction Materials – On September 16 through 19, 2002, all stockpiled construction materials at the site were sorted and

categorized to determine the materials that should be discarded and the materials

that were salvageable with proper cleaning procedures. Refer to Section 3.2 for a

further discussion.

• Baseline Mold Survey – On September 13 through September 25, 2002, a mold survey was conducted at the BLC. The mold survey consisted of a visual inspection

of the entire Site, the collection and analysis of bulk and tape lift samples for the

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potential presence of mold, and measurements of moisture levels of building

materials at the Site.

2.0 SITE DESCRIPTION

2.1 LOCATION

The Belmont Learning Complex (BLC or Site) is located at 1101 West 1st Street, in the City

of Los Angeles, County of Los Angeles, California (Figure 1). The L-shaped Site is

approximately 34 acres in size and is bordered by Colton Street and Boylston Street to the

north, Temple Street to the northeast, Toluca Street to the northwest, Beaudry Avenue to

the southeast, and 1st Street to the southwest.

2.2 SITE HISTORY AND BACKGROUND INFORMATION

Initial construction of the BLC reportedly began in November 1996. Structures to be

constructed at the BLC consisted of Academy Houses 1 through 4, an Administration

Center, a Locker Room Building, a Parking Garage, a Triple Gym, a Multi-Purpose

Building, a Double Gym, an Aquatic Center, and a Community Center. In January 2000,

LAUSD suspended work on the BLC due the results of environmental investigations

conducted at the Site. At that time, construction of Academy Houses 1 through 4, the

Administration Center, the Locker Room Building, the Parking Garage, and the Triple Gym

were underway; the remaining structures had not yet been constructed at the time the

project was halted. Site structures were subsequently secured with plywood and plastic

sheeting.

2.3 CURRENT SITE CONDITIONS

A Planning and Feasibility Study was approved in July 2002. Structures currently located

at the BLC include Academy Houses 1 through 4, the Administration Center, the Parking

Garage, the Locker Rooms, and the Triple Gym. Each of these on-Site structures is at

different levels of completion. The following is a summary of their current conditions.

Academy House 1

Final Approximate Size: 45,660 square feet

Current Condition: Partially constructed; no slab on grade (first floor); walls are

unfinished; roof is completed

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Academy House 2

Final Approximate Size: 43,180 square feet; total of three floors

Current Condition: Unfinished; roof is completed

Academy House 3


Current Condition: Partially finished; roof is completed; the unattached portion (western

apron) has not yet been constructed

Academy House 4


Current Condition: Partially finished; roof is completed; the unattached portion (western

apron) has not yet been constructed

Administration Center

Final Approximate Size: 31,560 square feet; total of two floors

Current Condition: Partially constructed; no slab on grade; walls are unfinished; roof is

partially completed

Parking Garage

Final Approximate Size: 299,580 square feet; total of three levels

Current Condition: Mostly finished

Locker Rooms

Final Approximate Size: 13,240 square feet; only one floor

Current Condition: Unfinished; roof is completed

Triple Gym

Final Approximate Size: 32,361 square feet; only one floor

Current Condition: Partially constructed; no slab on grade; roof is unfinished

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3.0 SUMMARY OF INVESTIGATION ACTIVITIES

The Baseline Mold Survey was conducted by URS at the BLC from September 12 through

September 24, 2002. The following subsections discuss field activities that were conducted

at the BLC.

3.1 SAMPLING AND DEMOLITION OF MOCK-UP CLASSROOMS

Two mock-up classrooms were located within Segment A on Level 1 of the Parking

Garage. Visible mold growth was noted on the walls of both classrooms. On September

18, 2002, two drywall samples (MOCKUP-1B and MOCKUP-2B) were collected from the

two mock-up classrooms and analytical results confirmed mold growth. At the request of

LAUSD, the mock-up classrooms were demolished by Aman Environmental (a subsidiary

of URS) on September 19 and 20, 2002. Prior to removing the floor tile, sample ASB-

0919-01 of the floor tile and mastic was collected and analyzed for asbestos. The sample

was collected by a California-certified consultant and submitted to an AIHA accredited

laboratory, Forensic Analytical of Rancho Dominguez, California. According to the

analytical results, no asbestos was detected in the floor tile or the mastic. The cabinets,

light fixtures, doorways, and doorframes, were not discarded, as requested by LAUSD.

These materials may be salvageable with proper cleaning procedures. The demolition

materials were temporarily stored in a roll-off bin and were lawfully disposed off site.

3.2 SORTING AND CATEGORIZATION OF STOCKPILED MATERIALS

Stockpiled construction materials were observed in all structures at the Site. From

September 16 through 19, 2002, Aman Environmental sorted and categorized all the stored

construction materials to determine the materials that should be discarded and the materials

that were salvageable with proper cleaning procedures.

Cabinets and other office/school furniture were observed within Segment C on Level 1 of

the Parking Garage. Furniture that appeared to be water damaged, such as wooden

cabinets, was tagged with a red circular sticker. Furniture that appeared to be salvageable

and could be properly cleaned, such as metal cabinets, was tagged with a green circular

sticker.

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Other construction materials stored throughout the remaining Site structures were marked

with red spray paint (for items that should be discarded) or green spray paint (for items that

were salvageable with proper cleaning procedures).

3.3 BASELINE MOLD SURVEY

As part of the Baseline Mold Survey, visual inspections of all interior areas of Site

structures were conducted and observations are presented in Table 1. Additionally, bulk

and tape lift samples of building materials were collected and analyzed for the potential

presence of mold. Building materials that were sampled included installed and uninstalled

ductwork, installed and uninstalled drywall, installed and uninstalled insulation, filters

within air conditioning units on the roofs, and installed Dens-Glass board. Sample

locations were selected based on areas of visible water damage, visible mold growth, and

random representative locations within Site structures. Sampling locations are depicted on

Figures 3 through 10.

Sample names beginning with “AB1” identified samples that were collected from Academy

House 1; “AB2” from Academy House 2; “AB3” from Academy House 3; “AB4” from

Academy House 4; “ADM” or “AE” from the Administration Center; “G” from the Parking

Garage; “LR” from the Locker Rooms; and “GYM” from the Triple Gym. Sample names

ending in “B” identified bulk samples. Sample names ending in “T” identified tape lift

samples.

Bulk samples of building materials were typically collected using a small handsaw. The

sample was placed into a re-sealable plastic bag and properly labeled. Tape lift samples

were collected by using a clear adhesive tape of good optical quality. Particles on a

selected surface were collected by gently touching the tape to the test surface and removing

the tape slowly. The tape was then attached to a clean glass slide and labeled with the

proper sample number. Prior to the collection of each tape lift sample, the glass slide was

cleaned with lens paper to remove any particulates that may have adhered to the slide

during storage or while at the Site. Properly labeled slides were then stored in a protective

slide box until they were delivered to the laboratory for analysis.

Upon collection of each bulk or tape lift sample, the sampled area was marked with orange

spray paint. Additionally, other areas of concern, such as water staining or visible mold

growth, were also marked with orange spray paint. Most of the sampled areas were

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subsequently photographed. These photographs are included as Appendix A.

All samples were transferred under chain-of-custody to the laboratory, Forensic Analytical

of Rancho Dominguez, California. The samples were submitted for Non-Viable Bulk

Fungal Analysis by direct microscopy. Analytical results of the mold survey samples are

presented in Table 2.

Moisture levels of building materials, specifically the installed drywall and Dens-Glass

board, were measured with a Tramex moisture meter. Moisture levels measured in each

of the Site structures are presented in Table 1. Moisture readings of installed drywall were

affected by metal studs and the metal lining associated with installed insulation.

4.0 SUMMARY OF FINDINGS

The following subsections discuss findings of the Baseline Mold Survey. Since each of the

Site structures is at different levels of completion, the subsections are presented on a

building-by-building basis. Visual observations and moisture readings are summarized in

Table 1. Analytical results are summarized in Table 2. Refer to Appendix A for

photographs of sampling locations and Appendix B for the laboratory data reports.

Sampling locations are depicted on Figures 3 through 10.

4.1 ACADEMY HOUSE 1

Construction in Academy House 1 has not progressed beyond framing and installation of

some drywall. The plumbing and electrical infrastructure are unfinished. HVAC systems

installed include plenums, distribution boxes, and a significant amount of flexible ducting.

Most of the windows on the second and third floors have been installed but many have not

been sealed.

The types of mold detected within Academy House 1 include Acremonium/Verticillium,

Alternaria, Ascospores, Basidiospores, Cladosporium, Dreschlera/Bipolaris, HYPHAE,

Penicillium/Aspergillus, Scopulariopsis, and Stachybotrys.

Ventilation Ductwork: Mold spores and mold growth was detected in both sealed and

unsealed, flex and rigid ductwork, specifically the interior surfaces of installed ventilation

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outlets and the interior insulation of installed ventilation inlets. Mold was also detected in

the uninstalled ventilation ductwork.

Fiberglass Insulation: Many areas within Academy House 1 have exposed fiberglass

insulation or similar fire safing materials. These exposed materials appeared to have

collected significant quantities of dust. Mold was detected in a sample (AB1-105-32B) of

fireproofing collected from the first floor.

Drywall: Water staining and/or various types of mold were detected in the installed

drywall at certain locations within Academy House 1, specifically in Rooms 217, 308, 309,

312, 313, 317, 322, and the elevator shaft. Mold was also detected in the uninstalled

drywall, specifically located in Room 319. Moisture levels of drywall within Academy

House 1 ranged between 9% and 35% relative humidity. Approximate quantity to be

removed is approximately 640 square feet.

Dens-Glass Board: Dens-Glass board is exposed on most facades of Academy House 1.

Samples collected of the installed Dens-Glass board indicated the presence of mold spores

and/or mold growth, specifically in Rooms 309, 312, 314, and 322. Moisture levels of

Dens-Glass board within Academy House 1 ranged between 15% and 20% relative

humidity.

Roof: The roof is finished of Academy House 1 and thus, no samples of roofing materials

were collected. The filters inside several air conditioning units were sampled. Mold spores

were detected in sample AB1-ACROOF-02B.

4.2 ACADEMY HOUSE 2

The types of mold detected within Academy House 2 include Alternaria, Basidiospores,

Chaetomium, Cladosporium, Dreschlera/Bipolaris, HYPHAE, Penicillium/Aspergillus, and

Stemphyllium.

Ventilation Ductwork: HVAC systems installed within Academy House 2 include

plenums, distribution boxes, and a significant amount of flexible ducting. Mold spores and

mold growth was detected in both sealed and unsealed, flex and rigid ductwork, specifically

the interior surfaces of installed ventilation outlets and the interior insulation of installed

ventilation inlets. Mold was also detected in the uninstalled ventilation ductwork.

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Fiberglass Insulation: Some areas of Academy House 2 have exposed fiberglass insulation

or similar fire safing materials. These exposed materials appeared to have collected

significant quantities of dust. Mold was detected in the installed insulation, specifically in

Rooms 109 and 111.


drywall at certain locations in Academy House 2, specifically in Rooms 116, 118, 119, 212,

217, and 319. Mold was also detected in the uninstalled drywall, specifically located in

Room 322. Moisture levels of drywall within Academy House 2 ranged between 5% and

46% relative humidity. Approximate quantity to be removed is approximately 690 square

feet.

Dens-Glass Board: Smaller areas of Dens-Glass board are exposed in Academy House 2

than in Academy House 1. Samples collected of the installed Dens-Glass board indicated

the presence of mold spores and/or mold growth, specifically in Room 140 and the corridor

on the third floor.

Roof: The roof is finished and thus, no samples of roofing materials were collected. The

filters inside several air conditioning units were sampled. Mold spores were detected in

sample AB2-ACROOF-01B.

4.3 ACADEMY HOUSE 3

The types of mold detected within Academy House 3 include Alternaria, Ascospores,

Basidiospores, Cladosporium, Dreschlera/Bipolaris, HYPHAE, and Stemphyllium.





ventilation inlets.

Fiberglass Insulation: The presence of substantially completed wall and ceiling systems

throughout Academy House 3 has minimized the amount of exposed fiberglass insulation or

similar fire safing materials. A sample (AB3-216-35B) of installed and exposed insulation

was collected from Room 216. Although the fiberglass insula tion appeared to have

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collected a significant amount of dust, no mold spores or mold growth was detected in the

sample.


drywall at certain locations in Academy House 3, specifically in Room 308 (significant

quantity of mold growth on the ceiling and the base of the walls) and Stairwell 130.

Moisture levels of drywall within Academy House 3 ranged between 2% and 80% relative

humidity. Approximate quantity to be removed is approximately 30 square feet.

Dens-Glass Board: Smaller areas of Dens-Glass board are exposed in Academy House 3.

No samples of the Dens-Glass board were collected.


filters inside several air conditioning units were sampled. Mold spores were detected in

sample AB3-ACROOF-05B.

4.4 ACADEMY HOUSE 4

The types of mold detected within Academy House 4 include Alternaria, Ascospores,

Basidiospores, Chaetomium, Cladosporium, Dreschlera/Bipolaris, Epicoccum, HYPHAE,

Penicillium/Aspergillus, Stemphyllium and Torula.





ventilation inlets.



similar fire safing materials. Samples of installed and exposed insulation were collected

from Rooms 107 and 308. Although the fiberglass insulation appeared to have collected a

significant amount of dust, no mold spores or mold growth was detected in the samples.


drywall at certain locations in Academy House 4, specifically in Rooms 312 and 324.

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Moisture levels of drywall within Academy House 4 ranged between 2% and 42% relative

humidity. Approximate quantity to be removed is approximately 4 square feet.

Dens-Glass Board: Smaller areas of Dens-Glass board are exposed in Academy House 3.

No samples of the Dens-Glass board were collected.


filters inside several air conditioning units were sampled and no mold or mold spores were

detected.

4.5 ADMINISTRATION CENTER

Since the concrete block walls of the Administration Center have only been partially built,

the interior areas of the Administration Center were exposed to the environment.

Additionally, there is no slab on grade (first floor). Pigeon droppings were observed

throughout the second floor. Various buildings materials, mainly uninstalled drywall and

ventilation ductwork, were observed on the second floor. Due to their prolonged exposure,

many of these uninstalled materials have significant quantities of pigeon droppings and

some are water stained. As a result, most of these uninstalled materials were marked for

removal.

The types of mold detected within the Administration Center include Alternaria,

Cladosporium, HYPHAE, and Penicillium/Aspergillus.

Mold was detected in a sample (AE-ELV-01T) collected from the wood framing of the

proposed elevator shaft (first floor). It is URS’ understanding that plywood and other

temporary wood framing currently used at the Site shall be removed as part of the BLC

reconstruction activities.

Ventilation Ductwork: According to LAUSD, all ductwork in the Administration Center

was planned for removal due to the presence of significant quantities of bird droppings and

thus, no samples were collected from the installed ductwork. Mold was detected in a

sample (AE-NWC-02B) of the fiberglass insulation on an uninstalled ventilation duct.

Fiberglass Insulation: No installed fiberglass insulation was noted in the Administration

Center.

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Drywall: Minimal quantities of drywall have been installed in the Administration Center.

No samples were collected.

Dens-Glass Board: No installed Dens-Glass board was noted in the Administration

Center.

Roof: The upper roof is finished and the lower roof is partially finished. A sample of the

unfinished edge of the lower roof (ADM-ROOF-12B) was collected and mold was

detected. The filter (sample ADM-ROOF-13B) inside one air conditioning unit located on

the upper roof was sampled and no mold or mold spores were detected.

4.6 PARKING GARAGE

Most areas of the Parking Garage are finished. The windows on Levels 2 and 3 have been

boarded with plywood. Various construction materials are stored throughout the parking

garage. Cabinets and other office/school furniture were observed within Segment C on

Level 1 of the Parking Garage. Level 1 of the Parking Garage was reportedly flooded in the

past. During this investigation, a puddle of water was observed within Segment C on Level

1 of the Parking Garage. Additionally, water staining was observed on the concrete walls

and floors on Level 1 of the Parking Garage.

The types of mold detected within Academy House 4 include Acremonium, Alternaria,

Ascospores, Cladosporium, Epicoccum, HYPHAE, Penicillium/Aspergillus, Stachybotrys,

and Ulocladium.

Ventilation Ductwork: Limited ductwork is installed in the Parking Garage. A sample

(GL1SC-P119-65B) of the interior fiberglass insulation of an installed ventilation duct was

collected and no mold was detected.

Fiberglass Insulation: Several areas in the Parking Garage have exposed fiberglass

insulation or similar fire safing materials. No samples were collected.

Drywall: Visible mold growth was detected on specific areas of drywall located on Levels

1 and 2 of the Parking Garage. Moisture levels of drywall within the Parking Garage

ranged between 4% and 42% relative humidity. Approximate quantity to be removed is

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approximately 1,290 square feet.

Dens-Glass Board: No Dens-Glass board was noted within the Parking Garage.

Concrete Formed Walls: Mold was detected in a tape lift sample of the stained concrete

surface adjacent to windows located within Segment A on Level 3 of the Parking Garage.

Roof: Not applicable because the Parking Garage is located beneath the Academy Houses.

4.7 LOCKER ROOMS

Although the concrete block walls of the Locker Rooms have been built, the interior areas

are skeletal with very limited drywall installed. The windows and have been boarded with

plywood. Additionally, two areas that appear to be skylights are also unfinished and

boarded with plywood; no evidence of mold growth was observed. It is URS’

understanding that plywood and other temporary wood framing currently used at the Site

shall be removed as part of the BLC reconstruction activities. Various buildings materials,

including uninstalled drywall, fiberglass insulation, and ventilation ductwork, were

observed in the Locker Rooms. The stored materials that appeared to be salvageable with

proper cleaning procedures were appropriately marked. The remaining stored materials

were marked for removal.

The types of mold detected within the Locker Rooms include Alternaria, Chaetomium,

Cladosporium, Dreschlera/Bipolaris, HYPHAE, and Stachybotrys.

Ventilation Ductwork: Mold was detected in both sealed and unsealed, flex ductwork,

specifically the interior surfaces of installed ventilation outlets.

Fiberglass Insulation: Minimal amounts of installed fiberglass insulation or fire safing

materials were noted in the Locker Rooms. No samples were collected.

Drywall: Minimal quantities of drywall have been installed in the Locker Rooms. No

evidence of visible mold growth or water staining was noted. No samples were collected.

Dens-Glass Board: No installed Dens-Glass board was noted in the Locker Rooms.

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filter inside one air conditioning unit was sampled. Mold was detected in sample LR-

ACEAST-09B.

4.8 TRIPLE GYM

Since the concrete block walls of the Triple Gym have only been partially built, the interior

areas of the Triple Gym were exposed to the environment. Additionally, there is no slab on

grade. Pigeon droppings were observed on the interior and exterior walls of the Triple

Gym. Spray-on fireproofing was also observed within the Triple Gym. Various

construction materials, mainly metal equipment and conduits, were stored in the Triple

Gym. The stored materials that appeared to be salvageable with proper cleaning procedures

were appropriately marked. The remaining stored materials were marked for removal.

Installed drywall, ventilation ductwork, and insulation were not observed within the Triple

Gym.

The roof of the Triple Gym is unfinished; only the metal decking has been installed. Three

air conditioning units were located on the roof. Two samples, GYM-ACROOF-10B (filter

within the air conditioning unit) and GYM-ACROOF-11B (insulation within the air

conditioning unit) were collected; no mold or mold spores were detected in the samples.

The concrete block walls were not sampled because there are no organic constituents on or

within the concrete walls suitable for mold growth.

5.0 CONCLUSIONS AND RECOMMENDATIONS

Samples of stored materials in all areas of the BLC, including drywall, insulation,

ventilation, and various other miscellaneous building materials have been collected and

analyzed. The results of these analyses indicate the presence of mold spores or mold

growth, which reinforces the stated assumption that these materials would be removed from

the Site and not used in future construction activities at the BLC.

Representative samples of ventilation ductwork within the Academy Houses, the Locker

Rooms, and the Parking Garage were collected. Bulk and tape lift samples collected from

sealed and unsealed, flex and rigid ductwork indicate the presence of various types of

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fungal growth and spores. As a result of these findings, it is recommended that all of the

ductwork at the Site, whether installed or stored, be cleaned to a condition similar to that of

new ductwork or removed and replaced with new ductwork. Based on experience,

ductwork with interior insulation and/or corrugated surfaces typically cannot be cleaned to

a new condition while installed. However, it is theoretically possible to remove small

sections of the ductwork, inspect each section for visible growth, clean sections with no

growth and replace that section. Sections with visible growth should be evaluated on a case-

by-case basis to determine if cleaning is possible and/or prudent. Prior to replacement of

cleaned section, swipe or tape lift samples should be collected to assess the effectiveness of

the cleaning process. Sections not determined to be adequately cleaned, should be recleaned

and retested prior to installation. Ductwork with internal insulation will be difficult or

impossible to clean. Flexible ductwork with plastic lining must be handled carefully in

order not to damage the lining. Metal lined corrugated ductwork should be cleaned with a

brush and HEPA vacuum and allowed to dry completely before testing. Smooth metal

ductwork can be cleaned using wet methods and HEPA vacuums. All ductwork should be

stored in a clean environment during cleaning, during and after testing, and until each

section is ready to be reinstalled.

Upon completion of all interior mold remediation work, all of the roof-mounted HVAC

units on the Academy Houses, the Triple Gym, the Administration Center, and the Locker

Rooms should have the filters replaced and normal maintenance should be performed.

Uninstalled materials, such as drywall and fiberglass insulation have been sorted and

marked accordingly. Due to their prolonged exposure, many of these materials have

collected significant quantities of dust, some are water stained, and analytical results

indicate the presence of mold. As a result, most of these uninstalled materials were marked

for removal. It is also URS’ understanding that plywood currently used at the Site shall

also be removed as part of the BLC reconstruction activities.

The following subsections are a further discussion of conclusions and recommendations for

each of the on-Site structures.

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5.1 ACADEMY HOUSE 1

Fiberglass Insulation: Many areas have exposed fiberglass insulation or similar fire safing

materials. Over time these materials have collected significant quantities of dust and

biological materials including mold spores. All exposed fiberglass insulation and similar

fire safing materials should be removed and replaced prior to installation of additional

drywall.

Drywall: Various locations in Academy House 1 were water stained or had suspected

visible mold growth. These areas were identified with orange spray paint and many were

sampled. Sample results indicate that various types of mold spores and mold growth were

present. These areas should be removed along with all associated fiberglass insulation and

fire safing materials. Minimum quantities of drywall to be removed are noted in Table 3.

Because these quantities are approximates, additional drywall and insulation that bears

evidence of water staining, water damage, or mold growth should be removed and may

affect the final removed quantity.

Dens-Glass Board: Dens-Glass board is exposed on most facades of Academy House 1.

Samples collected of this material indicated the presence of mold spores and mold growth.

The assumption that all of this material would be removed as part of the reconstruction of

the BLC is reinforced by these results.

5.2 ACADEMY HOUSE 2

Fiberglass Insulation: Some areas in Academy House 2 have exposed fiberglass insulation

or similar fire safing materials. Over time these materials have collected significant

quantities of dust and biological materials including mold spores. All exposed fiberglass

insulation and fire safing materials should be removed and replaced prior to installation of

additional drywall.






Because these quantities are approximates additional drywall and insulation that bears

evidence of water staining, water damage or mold growth should be removed and may

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Dens Glass Board: Smaller areas of Dens-Glass board are exposed in Academy House 2

than in Academy House 1. The assumption that all of this material would be removed as

part of the reconstruction of the BLC is reinforced by the results of the samples collected

from this material.

5.3 ACADEMY HOUSE 3



similar fire safing materials. Exposed fiberglass insulation and fire safing materials, located

primarily in the corridors, should be removed and replaced prior to installation of lighting

and other fixtures.




present. A substantial quantity of visible mold growth was identified in the ceiling and

walls of Room 308. These areas should be removed along with all associated fiberglass

insulation and fire safing materials. In addition, the HVAC system in the areas should be

thoroughly inspected and replaced if necessary. Minimum quantities of drywall to be

removed are noted in Table 3. Because these quantities are approximates, additional

drywall and insulation that bears evidence of water staining, water damage, or mold growth

should be removed and may affect the final removed quantity.

Dens-Glass Board: Small areas of Dens-Glass board remains exposed in Academy House

3. The assumption that all of this material would be removed as part of the reconstruction of

the BLC is reinforced by the results of the samples collected from this material.

5.4 ACADEMY HOUSE 4



similar fire safing materials. Exposed fiberglass insulation and fire safing materials, located

primarily in the corridors, should be removed and replaced prior to installation of lighting

and other fixtures.

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fire safing materials. In addition, the HVAC system in the areas should be thoroughly

inspected and replaced if necessary. Minimum quantities of drywall to be removed are

noted in Table 3. Because these quantities are approximates, additional drywall and

insulation that bears evidence of water staining, water damage, or mold growth should be

removed and may affect the final removed quantity.

Dens-Glass Board: Small areas of Dens Glass board remains exposed in Academy House

4. The assumption that all of this material would be removed as part of the reconstruction of

the BLC is reinforced by the results of the samples collected from this material.

5.5 ADMINISTRATION CENTER

Ventilation Ductwork: No samples were collected from the ductwork in the

Administration Center since all ductwork was planned for removal due to the presence of

significant quantities of bird droppings.

Fiberglass Insulation: No installed fiberglass insulation was noted in the Administration

Center.

Drywall: Minimal quantities of drywall have been installed in the Administration Center.

All of the drywall should be removed and replaced because of prolonged exposure and the

presence of large amounts of bird droppings.

Dens-Glass Board: No exposed Dens-Glass board was noted at the Administration Center.

Mold was detected in a sample collected from the wood framing of the proposed elevator

shaft. It is URS’ understanding that plywood and other temporary wood framing currently

used at the Site shall be removed as part of the BLC reconstruction activities. URS

specifically recommends the removal of the wood used in this area of the Administration

Center.

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Roofing Materials: Small quantities of roofing materials remain exposed. Bulk samples of

this roofing material indicate the presence of mold spores. To the extent possible, this

material should be removed as part of the work required to complete the roof.

5.6 PARKING GARAGE

Fiberglass Insulation: Several areas in the Parking Garage have exposed fiberglass

insulation or similar fire safing materials. All exposed fiberglass insulation and fire safing

materials should be removed and replaced prior to installation of additional drywall.

Drywall: Various locations in the Parking Garage were water stained or had suspected





Because these quantities are approximates additional drywall and insulation that bears

evidence of water staining, water damage, or mold growth should be removed and may


Concrete Formed Walls: Mold was also detected on the stained concrete surface adjacent

to windows located within Segment A on Level 3 of the Parking Garage. The concrete

surface appears to have been treated with an organic constituent ideal for mold growth.

URS recommends the concrete surface be cleaned to remove the staining in this area.

5.7 LOCKER ROOMS

Fiberglass Insulation: Minimal amounts of installed fiberglass insulation or fire safing

materials were noted in the Locker Rooms. All exposed fiberglass insulation and fire safing

materials should be removed and replaced prior to installation of additional drywall.

Drywall: Installed drywall was limited to a few areas of the Locker Rooms. No evidence

of mold growth was identified on drywall in the Locker Rooms.

5.8 TRIPLE GYM

Ductwork: No installed ductwork was noted in the Triple Gym.

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Fiberglass Insulation: No installed fiberglass insulation was noted in the Triple Gym.

Drywall: No installed drywall was noted in the Triple Gym.

6.0 REMOVAL OF CONTAMINATED MATERIALS

Ventilation Ductwork: Removal of contaminated ductwork that is not scheduled for

cleaning should be conducted by workers trained in the use of personal protective

equipment (PPE) and the handling of mold contaminated material. No special transportation

or disposal regulations related to mold contamination exist at this time. The types of PPE

that should be used for this type of removal should include at a minimum, hard hat and

safety glasses, inner latex or nitrile gloves and leather work gloves, coveralls, and half- face

respirators equipped with P95 or P100 filters. Contaminated ductwork should be securely

stored in an isolated location until removed from the site.

Fiberglass Insulation: Workers trained in the use of personal protective equipment (PPE)

and the handling of mold contaminated material should conduct removal of contaminated

fiberglass or fire safing. No special transportation or disposal regulations related to mold

contamination exist at this time. The types of PPE that should be used for this type of

removal should include at a minimum, hard hat and safety glasses, inner latex or nitrile

gloves and leather work gloves, coveralls, and half- face respirators equipped with P95 or

P100 filters. Contaminated fiberglass and fire safing should be removed and placed into 6-

mil polyethylene bags and securely stored in an isolated location until removed from the

site.

Drywall: Workers trained in the use of personal protective equipment (PPE) and the

handling of mold contaminated material should conduct removal of contaminated drywall.

No special transportation or disposal regulations related to mold contamination exist at this

time. The types of PPE that should be used for this type of removal should include at a

minimum, hard hat and safety glasses, inner latex or nitrile gloves and leather work gloves,

coveralls, and half- face respirators equipped with P95 or P100 filters. Contaminated

drywall should be removed and placed into 6-mil polyethylene bags and securely stored in

an isolated location until removed from the site. Negative pressure enclosures with HEPA

filtration should be constructed prior to commencement of the removal activities. Structural

elements and other materials remaining in the contaminated area should be wet wiped and

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HEPA vacuumed before the containment system is removed. Swipe or tape lift samples as

well as air sampling should be considered prior to removal of containment system.

Dens-Glass Board: Workers trained in the use of personal protective equipment (PPE) and

the handling of mold contaminated material should conduct removal of contaminated Dens-

Glass board. No special transportation or disposal regulations related to mold contamination

exist at this time. The types of PPE that should be used for this type of removal should

include at a minimum, hard hat and safety glasses, inner latex or nitrile gloves and leather

work gloves, coveralls, and half- face respirators equipped with P95 or P100 filters.

Contaminated Dens-Glass board should be removed and placed into secure dumpsters and

kept in a safe location until removed from the site.

7.0 LIMITATIONS AND EXCEPTIONS OF THE MOLD SURVEY

The conclusions presented in this report are professional opinions based solely upon

indicated data described in this report and the visual observations of the Site. The

conclusions are intended exclusively for the purpose outlined herein and the Site location

and project indicated. The Scope of Services performed in execution of this baseline mold

survey may not be appropriate to satisfy the needs of other users, and any use or reuse of

this document or the findings, conclusions, or recommendations presented herein is at the

sole risk of said user.

It should be recognized that this investigation was not intended to be a definitive survey of

the Site and the recommendations provided are not necessarily inclusive of all the possible

conditions. It is possible that currently unrecognized mold presence may exist at the Site.

Opinions and recommendations presented herein apply to the Site conditions existing at the

time of our investigation and cannot necessarily apply to Site changes of which URS is not

aware and has not had the opportunity to evaluate. Changes in the conditions of the Site

may occur with time due to natural processes or the works of man on the subject Site.

Changes in applicable standards may also occur as a result of legislation or the broadening

of knowledge. Accordingly, the findings of this report may be invalidated, wholly or in

part, by changes beyond our control.

-o0o-

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REFERENCES

Website: http://laschools.org/belmontlc/construction/

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