November 20, Dear Ms. Crabb:

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Branden Perkins
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1 November 20, 2018 Ms. Andrea Crabb, PE Director, Department of Residential Facilities University of Maryland 1200 Leonardtown Office Building 4725 Rossborough Lane College Park, Maryland Re: Report of Findings: Post-Remediation Efficacy Assessments University of Maryland - Elkton Hall 3981 Denton Service Lane College Park, MD VERTEX Project Number: Dear Ms. Crabb: The Vertex Companies, Inc. (VERTEX) is pleased to provide this report which presents the observations, conclusions, and recommendations of a limited evaluation of microbial remediation effectiveness in residential units on the 1 st through 5 th floors at the Elkton Hall student dormitory addressed 3981 Denton Service Lane in College Park, Maryland. BACKGROUND INFORMATION It was reported that students began moving in to Elkton Hall between August 24-26, 2018, for the fall semester. Shortly after move-in, some students began reporting suspected microbial growth on furniture such as desks and the backs of beds. Around September 10, 2018, University representatives reportedly began spot cleaning and/or replacing furniture items in a small number of units. During this time weather was unseasonably hot and humid, which is believed to have contributed to the reported conditions. Additionally, there were reports of students moving beds or other belongings in a manner that caused the blockage of airflow to/from the fan coil units. Reports of suspected microbial growth began to increase to the point where spot cleaning/replacement no longer was considered feasible. Remediation contractors Sandow Construction Inc. (Sandow) and Infinity Restoration Inc. (Infinity) were contracted by the University of Maryland (the University) to perform cleaning on a floor-by-floor basis. Additionally, mechanical contractor, WL Gary Companies, Inc., was contracted to perform assessment and cleaning of the fan coil units (FCUs). REMEDIATION ACTIVITES As noted, Sandow and Infinity performed the remediation in the units, with each contractor performing work in one wing of a floor. VERTEX was on-site during remediation activities of floors 1 through 5 and observed engineering controls utilized within the work areas to include 6-mil polyethylene barriers and High Efficiency Particulate Air (HEPA)-filtered air filtering machines to create negative air pressure within the contained spaces. Prior to work being performed on a floor, students were relocated to hotels and THE VERTEX COMPANIES, INC COLUMBIA GATEWAY DRIVE, SUITE 325 COLUMBIA, MARYLAND VERTEXENG.COM

2 University of Maryland Elkton Hall Page 2 all personal belongings, linens, etc. were removed from the Units. It was reported that students were offered off-site cleaning/laundering services of any clothes/personal belongings removed from the units. The units were left for remediation with only University-issued furniture remaining, which included desks, chairs, dressers, refrigerators, bed frames, vinyl blinds, and vinyl-sealed mattresses. The scope of work within each unit included remedial cleaning of the ceiling, walls, entry doors, closet components (folding doors, shelves, pipes, hooks, etc.), blinds, window frame, bed frame/mattress cover, wood trim, furniture (all surfaces, including the insides and undersides of all drawers), FCU internal components (coils, drip pans, pipes, diffuser fins), floors, and chairs. Cleaning was performed via wet-wiping using Shockwave antimicrobial solution, and HEPA-filtered vacuums. It was also reported that the FCUs were being assessed for proper operation including repositioning of temperature sensors, verifying temperature set points and sealing any open chilled water piping penetrations. It should be noted that remediation activities on the 6 th through 8 th floors were performed between September 25 and September 30, 2018, prior to VERTEX s involvement on the project. VERTEX did not perform visual assessment in any units on these floors. METHODOLOGIES The following assessment methods were utilized. Visual Observation Review of the work areas included observation of accessible portions of the work area and remaining building materials for evidence of residual water and/or microbial damage as well as associated remediation engineering controls. VERTEX s inspections included pulling out drawers to assess the inside, underside tops and backs (interior and exterior). POST-REMEDIATION OBSERVATIONS The following schedule identifies the dates that VERTEX was on-site to oversee remediation activities and perform visual assessments: 5 th Floor October 1, th Floor October 4, rd Floor October 5, nd Floor October 9, st Floor October 8, 2018 During each shift VERTEX representatives performed visual assessment of a residential unit and the FCU once VERTEX was notified that the remediation contractors, mechanical contractor, University Student Housing representatives, and University Mechanical Plant staff that remedial cleaning and repairs were complete, and that inspection and approval/certification from the referenced University departments had been issued for both the residential unit and the FCU. Ultimately, University Mechanical Plant staff was unable to perform assessment and certification in a timely manner, and since time was of the essence, VERTEX eventually performed assessment of the FCUs upon notification directly from the mechanical contractor that the FCU work was considered complete. VERTEX utilized a site checklist to ensure that a thorough assessment was performed. If any areas were deemed unsatisfactory and required re-cleaning during the initial assessment, VERTEX informed the respective contractor, and the required cleaning was completed. VERTEX then performed re-inspection to ensure satisfactory completion.

3 University of Maryland Elkton Hall Page 3 Once deemed complete, VERTEX posted a certification note at the door to the unit to inform other contractors and University representatives that the visual assessment was completed and further restoration activities (replacing FCU cover, reconfiguring/arranging furniture, etc.) could be performed. Appendix A includes a complete list of units that were assessed and the date the assessment and certification was completed. Appendix B includes the field checklists. The field checklists were not created until after 5 th floor inspections were completed, therefore there are no checklists for the 5 th floor. It should be noted that VERTEX s visual assessments were limited to residential units and did not include the common areas or associated bathrooms. Assessment also included limited surficial assessment of the Resident Advisor (RA) apartment units located on Floor 1, which were only partially cleared of the occupant s belongings. CONCLUSIONS / RECOMMENDATIONS During the final post-remediation visual inspection, VERTEX did not observe visible microbial contamination, debris, or water damaged materials within the work areas. Based on observations VERTEX concluded that remediation in each work area met established industrial efficacy standards. It is recommended that the source(s) of suspected microbial growth be identified and corrected. LIMITATIONS It should be noted that VERTEX s scope of work was limited to performing visual post-remediation efficacy assessments. VERTEX did not provide any input into developing the scope of work or performing initial assessments within the units. Additionally, VERTEX was not involved in investigating the source of the suspected microbial growth nor potential source correction actions. VERTEX also did not assess any personal belongings that had been removed from the units. VERTEX provided these services consistent with the level and skill ordinarily exercised by members of the profession currently practicing under similar conditions. This statement is in lieu of other statements either expressed or implied. This report is intended for the sole use of The University of Maryland. The scope of services performed in execution of this evaluation may not be appropriate to satisfy the needs of other users, and use or re-use of this document, the findings, conclusions, or recommendations is at the risk of said user. Although a reasonable attempt has been made to identify suspect fungi (mold) in the areas identified, the inspection techniques used are inherently limited in the sense that only full demolition procedures will reveal all building materials of a structure, and therefore, all areas of potential fungal growth. Additionally, the passage of time may result in a change in the environmental characteristics at this site. This report does not warrant against future operations or conditions that could affect the recommendations made. The results, findings, conclusions, and recommendations expressed in this report are based only on conditions that were observed during VERTEX s inspection of the site.

4 University of Maryland Elkton Hall Page 4 Thank you for this opportunity to be of service to University of Maryland. Should you have any questions, please contact us at Sincerely, The Vertex Companies, Inc. Derek R. Dauberman Division Manager Columbia, MD Michael D. Plainte Vice President Mid-Atlantic Attachments: Appendix A Post-Remediation Efficacy Assessment Summary Table Appendix B Field Visual Assessment Checklists Appendix C Photographic Documentation

5 APPENDIX A Post Remediation Efficacy Assessment Summary Table

6 Elkton Hall Post Remediation Efficacy Assessment Summary Table Unit Number Date of Inspection First Floor /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/ /8/2018 Second Floor /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/2018

7 Elkton Hall Post Remediation Efficacy Assessment Summary Table Unit Number Date of Inspection /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/ /9/2018 Third Floor /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/2018

8 Elkton Hall Post Remediation Efficacy Assessment Summary Table Unit Number Date of Inspection /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/ /5/2018 Fourth Floor /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/2018

9 Elkton Hall Post Remediation Efficacy Assessment Summary Table Unit Number Date of Inspection /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/ /4/2018 Fifth Floor /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/2018

10 Elkton Hall Post Remediation Efficacy Assessment Summary Table Unit Number Date of Inspection /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/ /1/2018

11 APPENDIX B Field Visual Assessment Checklists

12 1 st Floor

33 2 nd Floor

71 3 rd Floor

100

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110 4 th Floor

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149 APPENDIX B Photographic Documentation

Photographic Documentation Elkton Hall 3981 Denton

53218 Photo #1: View of typical room setup with

Cleaning included shelves, pipe, doors and walls.

View of typical dresser unit with drawers removed

150 Photographic Documentation Elkton Hall 3981 Denton Service Lane College Park, MD VERTEX Proj. No Photo #1: View of typical room setup with HEPA-filtered negative air machine ducted outdoors and dehumidifier. Photo #2: View of University checklist posted at entry to each room. Photo #3: View of typical closeout layout. Cleaning included shelves, pipe, doors and walls. Photo #4: View of typical dresser unit Photo #5: View of typical dresser unit with drawers removed following cleaning. Photo #6: View of typical dresser drawer underside following cleaning. Photographs taken between October 1-9, 2018 by VERTEX

(typical) Photo #9: View of typical desk

151 Photographic Documentation Elkton Hall 3981 Denton Service Lane College Park, MD VERTEX Proj. No Photo #7: Asbestos-containing black window glazing. Photo #8: LBP on metal door frame (typical) Photo #9: View of typical desk following cleaning Photo #10: View of typical desk drawer underside following cleaning. Photo #11: View of typical chair cover underside. Photo #12: View of typical bunk bed/mattress underside following cleaning. Photographs taken between October 1-9, 2018 by VERTEX

The RA Role with Maintenance Direct/SchoolDude How to Log-in (for first time users) Direction on how to Enter a Request What happens after Work Order

The RA Role with Maintenance Direct/SchoolDude How to Log-in (for first time users) Direction on how to Enter a Request What happens after Work Order submission? Examples of Vague Work Order Requests What