rare included in the scope of work. - stockton - air quality... · a preliminary indoor air quality...

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Only recommendations 1 & 2 on Page #4 are included in the scope of work.

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INTRODUCTION A preliminary indoor air quality (IAQ) evaluation was performed at the City of

Stockton Police Department on March 23, 2011. John J. Sacco, P.E., CIH of

Earthshine Consulting, Inc (ECI) performed the evaluation.

This was done at the request of Deserie Schaffer with the City of Stockton Public

Works Department. Officer Sidney Siv was the Police Department contact and

provided assistence.

The purpose of the evaluation was (1) to determine if there were any unusual

conditions with the indoor air at the time of the site visit and (2) to assess (on a

limited preliminary basis) the performance and condition of the heating,

ventilating and air conditioning (HVAC) system. A general approach was taken

since no specific potential air contaminants have been identified.

Limited inspections of the air handling systems were conducted. Air monitoring

was performed for mold (spore trap)1, ultrafine particles2, carbon monoxide3,

carbon dioxide4, temperature and humidity. These represent potential airborne

contaminants that may degrade IAQ or may point to abnormal conditions that

may suggest such degradation.

The evaluation was performed in the morning and afternoon on a weekday

during normal building operations.

1 Mold is a common component of indoor air. 2 Ultrafine particles are defined as particles less than 0.1 microns in diameter. Elevated levels may indicate inadequate HVAC system filtration, sources of combustion, chemical reactions, mold growth (from water intrusion), and unusual photocopy/printer toner emissions. 3 A common byproduct of combustion and indoor air pollutant. 4 Indoor carbon dioxide levels are a surrogate for adequate outsider air exchange. Carbon dioxide (from human respiration) builds up during the day inside a building without adequate air exchange and is diluted sufficiently in buildings with sufficient outside air exchange.

1

This activity is based on current environmental health practices. The results are

based on conditions that existed at the time of the site visit. These conditions

may vary over time. No guarantees or warranties (expressed or implied) are

made as to the findings or the recommendations developed.

A summary of the mold air sampling results is displayed in table one. Table two

depicts ultrafine particle measurements; and table three carbon dioxide, carbon

monoxide, temperature and humidity measurements.

Appendix one contains the mold air sampling laboratory reports. Appendix two

contains photographs of certain HVAC system components. Appendix three

describes the mold air monitoring; and the ultrafine particle, carbon dioxide,

carbon monoxide, temperature and humidity measurement methods.

RESULTS

1. A number of conditions with the HVAC system are resulting in degradation

of the indoor air quality (IAQ). These are:

a. The system is not balanced. This may be the cause of reported

thermal discomforts and too much or too little air in specific work

areas. (See recommendations)

b. The air handlers (especially the three in the basement) have

considerable debris accumulations and some evidence of historical

water intrusion. This indicates that a qualified contractor should

clean the HVAC system. Other conditions point to the need for

HVAC system cleaning—reports of dust accumulations on work

surfaces and abnormal particle counts from the air supply in MCI.

(See recommendations)

2

c. The ultrafine particle count measurements indicated an elevated

particle count at the air supply in MCI (3,300 particles per cubic

centimeter) compared to that measured in the room (2,700 particles

per cubic centimeter). This is an unusual condition that may

suggest a particle source in the HVAC system duct system. As

with item b., this indicates that a qualified contractor should clean

the HVAC system.

d. There was a slime accumulation noted in the condensate pan for

AC-1 in the basement. The condensate pans should be

periodically disinfected. (See recommendations)

e. There was visible debris noted on many of the air supply and return

louvers. This condition may be from normal operation (if e.g., the

louvers have not been cleaned in many years) or it may point to

historically elevated levels of particulates in the air stream

(especially if HVAC system filters have not been properly

serviced).5 These should be cleaned periodically. (See recommendations)

f. The fresh air intake louvers for the three basement air handlers are

located adjacent to a police car parking area. Running of vehicles

in this area (especially when backed up in the parking spaces)

should be avoided. (See recommendation)

g. There are debris accumulations and standing water outside the

fresh air intake louvers for the roof air handlers. (See Recommendations)

5 Reportly, the HVAC system filters were not adequately maintained in the past.

3

2. The filters in the air handlers were properly maintained and in good

condition.

3. The temperature was too high in the morning in Dispatch (77OF). This

was due to a malfunction with the HVAC system that was corrected by the

afternoon when the temperature dropped to 74OF. Otherwise temperature

and humidity levels were normal.

4. Carbon dioxide and carbon monoxide levels were normal. Carbon dioxide

levels were all below the maximum of 1,000 ppm and carbon monoxide

below the maximum 10 ppm recommended for good air quality.

5. The air sampling results for mold were normal at all 10 interior locations

tested.

6. Ultrafine particle counts were normal in the occupied spaces and air

supplies tested (except for the MCI supply as noted in item 1c. above).

RECOMMENDATIONS

1. Assess the HVAC system for water intrusion and fix leaks. Evidence of

historical water intrusion was noted in the roof and basement air handlers.

2. Clean the entire HVAC system using a contractor certified by the National

Air Ducts Cleaning Association (NADCA). Specify that the contractor use

NADCA certified workers to perform the work. The NADCA web site is at

www.nadca.com. The NADCA certified contactor should determine if

insulated sections can be properly cleaned or if replacement is needed.

4

http://www.nadca.com/

http://www.nadca.com/

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Recommendation No. 1 is part of the Base Bid.

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See photos in this report.

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Recommendation No. 2 is part of Alternate Add Bid #2.

3. Perform periodic air balancing using a contractor certified by the National

Environmental Balancing Bureau (NEBB). The NEBB web site is at

www.nebb.org. Confirm that the outside air louvers are set to deliver a

minimum of 16-20 cfm per person of outside air exchange during the

balancing.

4. Periodically clean the air supply and return ceiling louvers (in the occupied

spaces) to minimize visible dust accumulations. Use a HEPA vacuum and

have employees wear a N-95 dust mask. Consider cleaning at night or on

the weekends.

5. Periodically disinfected the condensate pans using an EPA registered

biocide approved for this use. Consider use of quaternary-based biocide

tablets (e.g., Pan Pads6) for on-going treatment.

6. Periodically clean up debris and eliminate the standing water condition on

the roof immediately outside the fresh air intakes.

7. Restrict operation of vehicles in the parking spaces adjacent to the fresh

air intakes for the basement air handlers. Consider eliminating parking

and running of vehicles in this area.

6 Pan Pads product brochure is attached. Additional information is available at http://www.nucalgon.com/products/IAQ_panpads.htm.

5

http://www.nebb.org/



http://www.nucalgon.com/products/IAQ_panpads.htm

Attachments Tables 1-3

Appendix 1--Mold Air Sampling Laboratory Report

Appendix 2—Photographs

Appendix 3--Mold Air Monitoring and Environmental Measurements

Appendix 4—Product Brochure Pan Pads

6

Table 1 Mold Air Sampling Results

Project: City of Stockton—Police Department Date Samples Collected: 3/23/11 Samples Collected by: Earthshine Consulting, Inc.

John J. Sacco, CIH, P.E.

Sample

# Location Spore Trap

1

Dispatch Basement Normal

2 IT Basement Normal

3 Watch Commander’s Office First Floor

Normal

4 Records First Floor Normal 5 Report Writing First Floor Normal 6 Traffic Report First Floor Normal 7 Roll Call First Floor Normal 8 Outside (Reference)

Basement Air Handlers Intakes ----

9 MCI First Floor Normal 10 Chief’s Secretary Office

Second Floor Normal

11 PNT Second Floor

Normal

12 Outside (Reference) Basement Air Handlers Intakes

----

Table 2 Ultrafine Particle Counter Measurements

Project: City of Stockton—Police Department Date Samples Collected: 3/23/11 Measurements by: Earthshine Consulting, Inc.


Location Time

Concentration Particles per cubic

centimeter

% Outside

Dispatch Basement 1317 250 2 IT Basement 1330 260 2

Watch Commander’s Office First Floor

1340 1,700 15

Records First Floor 1306 1,700 15 Report Writing First Floor 1359 3,600 31 Traffic Report First Floor 1408 2,900 25

Roll Call First Floor 1153 1,600 14 Outside (Reference)

Basement Air Handlers Intakes

1145 1420

12,100 10,900

Average 11,500

------

MCI First Floor 1351 2,700 23 Chief’s Secretary Office

Second Floor 1427 2,900 25

PNT Second Floor

1440 2,200 19

Table 3 CO2, CO, Temperature & Humidity Measurements

Project: City of Stockton—Police Department Date Samples Collected: 3/23/11 Measurements by: Earthshine Consulting, Inc.


Location Time CO2ppm

COppm

Temperature oF

Humidity %

Dispatch Basement

11041504

670 810

1 2

77 74

34 37

IT Basement

11071505

800 870

1 2

76 75

34 37

Watch Commander’s Office First Floor

11091532

610 590

1 1

73 74

37 41

Records 1st Floor

11131512

610 590

1 1

74 74

38 41

Report Writing 1st Floor

11151514

510 520

1 2

75 76

35 38

Traffic Report 1st Floor

11181517

590 630

1 2

75 74

36 39

Roll Call 1st Floor

11291510

540 530

1 1

76 73

35 41

Outside 11201522

550 520

1 1

58 60

59 62

MCI 1st Floor

11241521

610 610

1 1

70 74

43 40

Chief’s Secretary Office 2nd Floor

11331527

530 780

1 1

75 75

35 43

PNT 2nd Floor

11351512

540 590

1 1

74 74

36 41

ppm = parts of gas per million parts of air by volume.

Appendix 1

Mold Air Sampling Laboratory Report

Asbestos • Lead • Environmental • Materials & Indoor Air Analysis

EMSL Analytical, Inc.2235 Polvorosa Ave , Suite 230 San Leandro, CA 94577

Phone: (510) 895-3675 Fax: (510) 895-3680 Web: http://www.emsl.com Email:[email protected]

Attn: John Sacco

Earthshine Consulting, Inc.

2324 Clubhouse Drive

Rocklin, CA 95765

Proj: SPD

EMSL Order:Customer ID:

Received:

Analyzed:

Collected:

091102660EARC62

3/24/20113/26/2011

3/23/2011

Test Report: Air-O - Cell(™) Analysis of Fungal Spores & Particulates by Optical Microscopy (EMSL Method 05-TP-003)

Lab Sample Number:

Client Sample ID:

Volume (L):

Sample Location:

091102660-0001

1-16714174

76

Dispatch - B

091102660-0002

2-16714166

76

IT-B

091102660-0003

3-16714154

76

Watch commander's office -1

Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of TotalAlternaria 1* 13* 23.6 - - - - - -

Ascospores - - - - - - - - -

Aspergillus/Penicillium - - - - - - - - -

Basidiospores - - - 1* 13* 19.1 - - -

Bipolaris++ - - - - - - - - -

Chaetomium - - - - - - - - -

Cladosporium 1 42 76.4 1 42 61.8 1 42 100

Curvularia - - - - - - - - -

Epicoccum - - - - - - - - -

Fusarium - - - - - - - - -

Ganoderma - - - - - - - - -

Myxomycetes++ - - - 1* 13* 19.1 - - -

Pithomyces - - - - - - - - -

Rust - - - - - - - - -

Scopulariopsis - - - - - - - - -

Stachybotrys - - - - - - - - -

Torula - - - - - - - - -

Ulocladium - - - - - - - - -

Unidentifiable Spores - - - - - - - - -

Zygomycetes - - - - - - - - -

Botrytis - - - - - - - - -

Total Fungi 2 55 100 3 68 100 1 42 100

Hyphal Fragment - - - - - - - - -

Insect Fragment - - - - - - - - -

Pollen - - - - - - 1* 13* -

Analyt. Sensitivity 600x - 42 - - 42 - - 42 -

Analyt. Sensitivity 300x - 13* - - 13* - - 13* -

Skin Fragments (1-4) - 2 - - 2 - - 2 -

Fibrous Particulate (1-4) - 1 - - 2 - - 1 -

Background (1-5) - 2 - - 2 - - 2 -

Initial report from: 03/26/2011 13:20:17

No discernable field blank was submitted with this group of samples.

Samples analyzed by EMSL Analytical, Inc San Leandro, CA AIHA-LAP, LLC--EMLAP Lab 101748

Israel Gutierrez

or Other Approved Signatory

High levels of background particulate can obscure spores and other particulates leading to underestimation. Background levels

of 5 indicate an overloading of background particulates, prohibiting accurate detection and quantification. Present = Spores

detected on overloaded samples. Results are not blank corrected unless othewise noted. The detection limit is equal to one

fungal spore, structure, pollen, fiber particle or insect fragment. "*" Denotes particles found at 300X. "-" Denotes not detected.

EMSL maintains liability limited to cost of anaysis. This report relates only to the samples reported above and may not be

reproduced, except in full, without written approval by EMSL. EMSL bears no responsibility for sample collection activities or

analytical method limitations. Interpretation and use of test results are the responsibility of the client. Samples received in good

condition unless otherwise noted.

Bipolaris++ = Bipolaris/Dreschlera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut

Page 1 of 4

For Information on the fungi listed in this report please visit the Resources section at www.emsl.com

Test Report SPVER3-7.22.7 Printed: 3/27/2011 10:38:22AM




Attn: John Sacco



Rocklin, CA 95765

Proj: SPD


Received:

Analyzed:

Collected:

091102660EARC62

3/24/20113/26/2011

3/23/2011


Lab Sample Number:

Client Sample ID:

Volume (L):

Sample Location:

091102660-0004

4-16714859

76

Records - 1

091102660-0005

5-16714168

76

Reort writing - 1

091102660-0006

6-16714034

76

Traffic report -1

Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of TotalAlternaria 1* 13* 23.6 - - - - - -

Ascospores 1 42 76.4 - - - - - -


Basidiospores - - - - - - - - -

Bipolaris++ - - - - - - - - -

Chaetomium - - - - - - - - -

Cladosporium - - - - - - - - -

Curvularia - - - - - - - - -

Epicoccum - - - - - - - - -

Fusarium - - - - - - - - -

Ganoderma - - - - - - - - -

Myxomycetes++ - - - 1 42 100 - - -

Pithomyces - - - - - - - - -

Rust - - - - - - - - -



Torula - - - - - - - - -

Ulocladium - - - - - - - - -


Zygomycetes - - - - - - - - -

Botrytis - - - - - - - - -

Total Fungi 2 55 100 1 42 100 - None Detected -



Pollen - - - - - - - - -



Skin Fragments (1-4) - 1 - - 1 - - 2 -


Background (1-5) - 2 - - 2 - - 2 -




Israel Gutierrez











Page 2 of 4






Attn: John Sacco



Rocklin, CA 95765

Proj: SPD


Received:

Analyzed:

Collected:

091102660EARC62

3/24/20113/26/2011

3/23/2011


Lab Sample Number:

Client Sample ID:

Volume (L):

Sample Location:

091102660-0007

7-16714055

76

Roll call - 1

091102660-0008

8-16710194

76

Outside -1

091102660-0009

9-16714161

76

MCI - 1

Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of TotalAlternaria - - - 1* 13* 0.8 - - -

Ascospores - - - 15 625 37.2 1 42 61.8


Basidiospores - - - 16 666 39.6 - - -

Bipolaris++ - - - - - - - - -

Chaetomium - - - - - - - - -

Cladosporium - - - 9 375 22.3 1* 13* 19.1

Curvularia - - - - - - - - -

Epicoccum - - - - - - - - -

Fusarium - - - - - - - - -

Ganoderma - - - - - - - - -

Myxomycetes++ - - - - - - 1* 13* 19.1

Pithomyces - - - - - - - - -

Rust - - - - - - - - -



Torula - - - - - - - - -

Ulocladium - - - - - - - - -


Zygomycetes - - - - - - - - -

Botrytis - - - - - - - - -

Total Fungi - None Detected - 41 1680 100 3 68 100



Pollen - - - 1 42 - 2 83 -



Skin Fragments (1-4) - 2 - - 1 - - 2 -


Background (1-5) - 2 - - 2 - - 2 -




Israel Gutierrez











Page 3 of 4






Attn: John Sacco



Rocklin, CA 95765

Proj: SPD


Received:

Analyzed:

Collected:

091102660EARC62

3/24/20113/26/2011

3/23/2011


Lab Sample Number:

Client Sample ID:

Volume (L):

Sample Location:

091102660-0010

10-16714156

76

Chief's secretary office - 2

091102660-0011

11-16714124

76

PNT -2

091102660-0012

12-16714148

76

Outside -2

Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of TotalAlternaria - - - - - - - - -

Ascospores - - - - - - 11 458 37.9

Aspergillus/Penicillium - - - - - - 1 42 3.5

Basidiospores - - - 1 42 100 10 416 34.4

Bipolaris++ - - - - - - - - -

Chaetomium - - - - - - - - -

Cladosporium - - - - - - 6 250 20.7

Curvularia - - - - - - - - -

Epicoccum 1* 13* 50 - - - - - -

Fusarium - - - - - - - - -

Ganoderma - - - - - - - - -

Myxomycetes++ 1* 13* 50 - - - - - -

Pithomyces - - - - - - - - -

Rust - - - - - - - - -



Torula - - - - - - - - -

Ulocladium - - - - - - - - -


Zygomycetes - - - - - - - - -

Botrytis - - - - - - 1 42 3.5

Total Fungi 2 26 100 1 42 100 29 1210 100



Pollen - - - 1* 13* - - - -



Skin Fragments (1-4) - 2 - - 2 - - 1 -


Background (1-5) - 2 - - 2 - - 1 -




Israel Gutierrez











Page 4 of 4



Appendix 2

Photographs

City of Stockton Police Department March 23, 2011

Photograph #1

AC-1 Air Handler Heavy Debris

1


Photograph #2


Photograph #3


2


Photograph #4

AC-1 Condensation Pan Slime

3


Photograph #5

Roof AC Air Handler Rust from Old Water Intrusion

Rust

Photograph #6 Roof AC Air Handler

Rust from Old Water Intrusion Debris

4


Photograph #7

Roof AC-2 Fresh Air Intake Plenum Debris

Photograph #8

Roof AC-2 Fresh Air Intake Debris

5


Photograph #9

Roof AC-2 Fresh Air Intake Exterior Roof Debris and Standing Water

Photograph #10

Visible Debris on Supply

6


Photograph #11

Visible Debris on Return

7

Appendix 3 Mold Air Monitoring and Environmental

Measurements

Appendix 3

Mold Sampling & Environmental Measurement Methods

Mold Air Sampling Air samples were collected for non-culturable (non-viable) fungi and other

biological particles using a Zefon Air-O-Cell Cassettes. Air drawn through the

cassettes is deposited on a glass slide contained in the cassette housing. After

sampling (at the analytical laboratory) the glass slide is removed and a direct

microscopic analysis is performed. Air is drawn through the cassette at with a

high volume air pump. The collection device ran for 5 minutes at a nominal flow

rate of 15 liters per minute. The flow rate was calibrated on-site (before and after

sampling) using a primary standard traceable to the NIST).

The Air-O-Cell medium was analyzed for fungi identification and concentration

(presumed fungal structures per cubic meter of air sampled). Control samples

were taken outside. This method measures viable and non-viable fungi that is

alive.

Ultrafine Particle Measurements (Counts)

Ultrafine particles were measured (counted) with a P-Trak Ultrafine Particle

Counter Model #8525, Serial #05031002 manufactured by TSI Incorporated of

St. Paul, Minnesota. This instrument is designed to measure ultrafine particles

(particles less than 0.1 um) that are often produced by combustion and some

chemical reactions. Measurement of these very tiny particles is useful in

performing indoor air quality investigations as it sometimes identifies sources of

contamination and aids in assessing a building’s heating, ventilating and air

conditioning (HVAC) system performance.

These are real-time measurements averaged over 10 second intervals and are

expressed as particles per cubic centimeter (particles per cm3) of air.

1

The instrument was calibrated by the manufacturer using National Institute of

Standards and Technology (NIST) calibration standards where applicable and

internal TSI calibration standards where NIST standards do not exist.

CO, CO2, Temperature and Humidity Measurements

Carbon monoxide, carbon dioxide, temperature and humidity measurements

were taken with a direct reading instrument--TSI IAQ Calc model #8762, serial

#55020494. The manufacturer, using standards traceable to the National

Institute of Standards and Technology, calibrated this instrument. For carbon

monoxide and carbon dioxide measurements, the instrument was zeroed and

calibrated on-site immediately prior to any measurements using calibration gas

provided by the manufacturer.

2

Appendix 4

Product Brochure Pan Pads

PanPads® Condensate Pan Treatment

Ideal for all air conditioning and •refrigeration condensate applications.

Control slime build-up, eliminating overflow •of condensate pans.

Control the growth of harmful bacteria, •including those causing Legionnaire’s Disease.

6 to 9 month service life•

Eliminate objectionable or musty odors •caused by bacterial slime build-up.

EPA Registration #33427-4-65516.•

Integral part of the Clean Coil™ Program.•

Indoor Air Quality Products

PanPads®

DescriptionThe product is a quaternary-based biocide, formulated in tablet form and enclosed in a plastic housing which in turn is sealed ultrasonically to an absorbent white filter pad. Water is absorbed by the pad and “wicked” to the tablet, resulting in the immediate, but controlled, release of the powerful biocide. PanPads can be used in any condensate pan arrangements, either horizontally or vertically. It’s low profile fits most pan configurations. Formulated buffering agents help protect pan against corrosion. When used as part of the Clean Coil Program, equipment is assured of optimum performance at the lowest possible energy cost.

ApplicationAir conditioning and refrigeration evaporator or cooling coils cool the air that is brought across them. In the process, moisture can be removed from the air, resulting in condensate. This condensate is collected in the condensate pan and drained away. Without proper treatment, bacteria can begin to grow in the pan, clogging the drain hole and resulting in overflow. In addition, this bacteria can also cause musty odors as well as respiratory ailments, contributing to an indoor air quality (IAQ) problem. Use of PanPads kills this bacteria, preventing these problems.

Packaging4295-36 PanPads-5 Slim treats up to 5 tons

4295-34 PanPads-5 treats up to 5 tons



SpecificationsPanPads are available in four sizes designated as PanPads-5 Slim, PanPads-5, PanPads-15 and PanPads-45.

PanPads-5 Slim:• 3.25 oz; 6.5˝ long x 1.5˝ wide x 3/8˝; treats up to 5 tons, Part No. 4295-36.

PanPads-5:• 3/4 oz; 2-3/4˝ long x 2-1/4˝ wide x 1/2˝; treats up to 5 tons, Part No. 4295-34.

PanPads-15:• 2.125 oz; 3-3/8˝ long x 2-1/2˝ wide x 7/8˝; treats up to 15 tons, Part No. 4296-24.

PanPads-45• : 6 oz; 8˝ long x 2-3/4˝ wide x .875˝; treats up to 45 tons, Part No. 4296-45.

Do not use where temperature will exceed 150ºF.

Nu-Calgon Product Bulletin 3-25

2008AltomCt.•St.Louis,MO63146•800-554-5499•www.nucalgon.com

Read and understand the product’s label and MaterialSafety Data Sheet (“MSDS”) for precautionary and firstaid information.

TheMSDSisavailableontheNu-Calgonwebsiteatwww.nucalgon.comorisreturnablebyU.S.Mailuponrequest.

Calgon is a licensed trade name.

rare included in the scope of work. - stockton - air quality... · a preliminary indoor air quality...

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