INTRODUCTION. The evaluation was performed in the morning and afternoon on a weekday during normal building operations.

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2 INTRODUCTION A preliminary indoor air quality (IAQ) evaluation was performed at the City of Stockton Police Department on March 23, 20. 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 () 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), ultrafine particles 2, carbon monoxide 3, carbon dioxide 4, 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. Mold is a common component of indoor air. 2 Ultrafine particles are defined as particles less than 0. 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.

3 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. 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

4 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- 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

5 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 (77 O F). This was due to a malfunction with the HVAC system that was corrected by the afternoon when the temperature dropped to 74 O F. 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,000 ppm and carbon monoxide below the maximum 0 ppm recommended for good air quality. 5. The air sampling results for mold were normal at all 0 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 c. above). RECOMMENDATIONS. 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 The NADCA certified contactor should determine if insulated sections can be properly cleaned or if replacement is needed. 4

6 3. Perform periodic air balancing using a contractor certified by the National Environmental Balancing Bureau (NEBB). The NEBB web site is at Confirm that the outside air louvers are set to deliver a minimum of 6-20 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 Pads 6 ) 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 5

7 Attachments Tables -3 Appendix --Mold Air Sampling Laboratory Report Appendix 2 Photographs Appendix 3--Mold Air Monitoring and Environmental Measurements Appendix 4 Product Brochure Pan Pads 6

8 Project: City of Stockton Police Department Date Samples Collected: 3/23/ Table Mold Air Sampling Results Samples Collected by: Earthshine Consulting, Inc. John J. Sacco, CIH, P.E. Sample Location Spore Trap # Dispatch Basement Normal 2 IT Basement Normal 3 Watch Commander s Office Normal First Floor 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 0 Chief s Secretary Office Normal Second Floor PNT Normal Second Floor 2 Outside (Reference) Basement Air Handlers Intakes ----

9 Project: City of Stockton Police Department Date Samples Collected: 3/23/ Measurements by: Earthshine Consulting, Inc. John J. Sacco, CIH, P.E. Table 2 Ultrafine Particle Counter Measurements Location Time Concentration % Outside Particles per cubic centimeter Dispatch Basement IT Basement Watch Commander s Office 340,700 5 First Floor Records First Floor 306,700 5 Report Writing First Floor 359 3,600 3 Traffic Report First Floor 408 2, Roll Call First Floor 53,600 4 Outside (Reference) Basement Air Handlers Intakes ,00 0,900 Average, MCI First Floor 35 2, Chief s Secretary Office 427 2, Second Floor PNT Second Floor 440 2,200 9

10 Table 3 CO 2, CO, Temperature & Humidity Measurements Project: City of Stockton Police Department Date Samples Collected: 3/23/ Measurements by: Earthshine Consulting, Inc. John J. Sacco, CIH, P.E. Location Time CO 2 ppm Dispatch Basement IT Basement Watch Commander s Office First Floor Records 3 60 st Floor Report Writing 5 50 st Floor Traffic Report st Floor Roll Call st Floor Outside MCI st Floor Chief s Secretary Office nd Floor PNT nd Floor CO ppm ppm = parts of gas per million parts of air by volume. Temperature o F Humidity %

11 Appendix Mold Air Sampling Laboratory Report

12 Attn: Proj: EMSL Analytical, Inc Polvorosa Ave, Suite 230 San Leandro, CA Asbestos Lead Environmental Materials & Indoor Air Analysis Phone: (50) Fax: (50) Web: John Sacco Earthshine Consulting, Inc Clubhouse Drive Rocklin, CA SPD EMSL Order: Customer ID: Collected: Received: Analyzed: EARC62 3/23/20 3/24/20 3/26/20 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: Dispatch - B IT-B Watch commander's office - Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Alternaria * 3* Ascospores Aspergillus/Penicillium Basidiospores * 3* Bipolaris Chaetomium Cladosporium Curvularia Epicoccum Fusarium Ganoderma Myxomycetes * 3* Pithomyces Rust Scopulariopsis Stachybotrys Torula Ulocladium Unidentifiable Spores Zygomycetes Botrytis Total Fungi Hyphal Fragment Insect Fragment Pollen * 3* - Analyt. Sensitivity 600x Analyt. Sensitivity 300x - 3* - - 3* - - 3* - Skin Fragments (-4) Fibrous Particulate (-4) Background (-5) Initial report from: 03/26/20 3:20:7 Bipolaris++ = Bipolaris/Dreschlera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut 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 0748 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. Israel Gutierrez or Other Approved Signatory For Information on the fungi listed in this report please visit the Resources section at Test Report SPVER Printed: 3/27/20 0:38:22AM Page of 4

13 Attn: Proj: EMSL Analytical, Inc Polvorosa Ave, Suite 230 San Leandro, CA Asbestos Lead Environmental Materials & Indoor Air Analysis Phone: (50) Fax: (50) Web: John Sacco Earthshine Consulting, Inc Clubhouse Drive Rocklin, CA SPD EMSL Order: Customer ID: Collected: Received: Analyzed: EARC62 3/23/20 3/24/20 3/26/20 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: Records Reort writing Traffic report - Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Alternaria * 3* Ascospores Aspergillus/Penicillium Basidiospores Bipolaris Chaetomium Cladosporium Curvularia Epicoccum Fusarium Ganoderma Myxomycetes Pithomyces Rust Scopulariopsis Stachybotrys Torula Ulocladium Unidentifiable Spores Zygomycetes Botrytis Total Fungi None Detected - Hyphal Fragment Insect Fragment Pollen Analyt. Sensitivity 600x Analyt. Sensitivity 300x - 3* - - 3* - - 3* - Skin Fragments (-4) Fibrous Particulate (-4) Background (-5) Initial report from: 03/26/20 3:20:7 Bipolaris++ = Bipolaris/Dreschlera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut 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 0748 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. Israel Gutierrez or Other Approved Signatory For Information on the fungi listed in this report please visit the Resources section at Test Report SPVER Printed: 3/27/20 0:38:22AM Page 2 of 4

14 Attn: Proj: EMSL Analytical, Inc Polvorosa Ave, Suite 230 San Leandro, CA Asbestos Lead Environmental Materials & Indoor Air Analysis Phone: (50) Fax: (50) Web: John Sacco Earthshine Consulting, Inc Clubhouse Drive Rocklin, CA SPD EMSL Order: Customer ID: Collected: Received: Analyzed: EARC62 3/23/20 3/24/20 3/26/20 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: Roll call Outside MCI - Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Alternaria * 3* Ascospores Aspergillus/Penicillium Basidiospores Bipolaris Chaetomium Cladosporium * 3* 9. Curvularia Epicoccum Fusarium Ganoderma Myxomycetes * 3* 9. Pithomyces Rust Scopulariopsis Stachybotrys Torula Ulocladium Unidentifiable Spores Zygomycetes Botrytis Total Fungi - None Detected Hyphal Fragment Insect Fragment Pollen Analyt. Sensitivity 600x Analyt. Sensitivity 300x - 3* - - 3* - - 3* - Skin Fragments (-4) Fibrous Particulate (-4) Background (-5) Initial report from: 03/26/20 3:20:7 Bipolaris++ = Bipolaris/Dreschlera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut 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 0748 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. Israel Gutierrez or Other Approved Signatory For Information on the fungi listed in this report please visit the Resources section at Test Report SPVER Printed: 3/27/20 0:38:22AM Page 3 of 4

15 Attn: Proj: EMSL Analytical, Inc Polvorosa Ave, Suite 230 San Leandro, CA Asbestos Lead Environmental Materials & Indoor Air Analysis Phone: (50) Fax: (50) Web: John Sacco Earthshine Consulting, Inc Clubhouse Drive Rocklin, CA SPD EMSL Order: Customer ID: Collected: Received: Analyzed: EARC62 3/23/20 3/24/20 3/26/20 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: Chief's secretary office PNT Outside -2 Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Alternaria Ascospores Aspergillus/Penicillium Basidiospores Bipolaris Chaetomium Cladosporium Curvularia Epicoccum * 3* Fusarium Ganoderma Myxomycetes++ * 3* Pithomyces Rust Scopulariopsis Stachybotrys Torula Ulocladium Unidentifiable Spores Zygomycetes Botrytis Total Fungi Hyphal Fragment Insect Fragment Pollen * 3* Analyt. Sensitivity 600x Analyt. Sensitivity 300x - 3* - - 3* - - 3* - Skin Fragments (-4) Fibrous Particulate (-4) Background (-5) Initial report from: 03/26/20 3:20:7 Bipolaris++ = Bipolaris/Dreschlera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut 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 0748 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. Israel Gutierrez or Other Approved Signatory For Information on the fungi listed in this report please visit the Resources section at Test Report SPVER Printed: 3/27/20 0:38:22AM Page 4 of 4

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18 Appendix 2 Photographs

19 City of Stockton Police Department March 23, 20 Photograph # AC- Air Handler Heavy Debris

20 City of Stockton Police Department March 23, 20 Photograph #2 AC-2 Air Handler Heavy Debris Photograph #3 AC-3 Air Handler Heavy Debris 2

21 City of Stockton Police Department March 23, 20 Photograph #4 AC- Condensation Pan Slime 3

22 City of Stockton Police Department March 23, 20 Photograph #5 Roof AC Air Handler Rust from Old Water Intrusion Rust Debris Photograph #6 Roof AC Air Handler Rust from Old Water Intrusion 4

23 City of Stockton Police Department March 23, 20 Photograph #7 Roof AC-2 Fresh Air Intake Plenum Debris Photograph #8 Roof AC-2 Fresh Air Intake Debris 5

24 City of Stockton Police Department March 23, 20 Photograph #9 Roof AC-2 Fresh Air Intake Exterior Roof Debris and Standing Water Photograph #0 Visible Debris on Supply 6

25 City of Stockton Police Department March 23, 20 Photograph # Visible Debris on Return 7

26 Appendix 3 Mold Air Monitoring and Environmental Measurements

27 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 5 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 # manufactured by TSI Incorporated of St. Paul, Minnesota. This instrument is designed to measure ultrafine particles (particles less than 0. 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 0 second intervals and are expressed as particles per cubic centimeter (particles per cm 3 ) of air.

28 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, CO 2, 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 # 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

29 Appendix 4 Product Brochure Pan Pads

30 Nu-Calgon Product Bulletin 3-25 PanPads Condensate Pan Treatment Indoor Air Quality Products Ideal for all air conditioning and refrigeration condensate applications. PanPads 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 # Integral part of the Clean Coil Program. Description The 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. Application Air 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. Packaging PanPads-5 Slim treats up to 5 tons PanPads-5 treats up to 5 tons PanPads-5 treats up to 5 tons PanPads-45 treats up to 45 tons Specifications PanPads are available in four sizes designated as PanPads-5 Slim, PanPads-5, PanPads-5 and PanPads-45. PanPads-5 Slim: 3.25 oz; 6.5 long x.5 wide x 3/8 ; treats up to 5 tons, Part No PanPads-5: 3/4 oz; 2-3/4 long x 2-/4 wide x /2 ; treats up to 5 tons, Part No PanPads-5: 2.25 oz; 3-3/8 long x 2-/2 wide x 7/8 ; treats up to 5 tons, Part No PanPads-45: 6 oz; 8 long x 2-3/4 wide x.875 ; treats up to 45 tons, Part No Do not use where temperature will exceed 50ºF Altom Ct. St. Louis, MO

31 Read and understand the product s label and Material Safety Data Sheet ( MSDS ) for precautionary and first aid information. The MSDS is available on the Nu-Calgon website at www. nucalgon.com or is returnable by U.S. Mail upon request. Calgon is a licensed trade name.