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Compliance • Restoration Brighton, MI 48116

800 395-ASTI

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February 6, 2017 Ms. Nancy Heinrich Prentis II JSL LDHA LP 15000 West Ten Mile Road Oak Park, Michigan 48237 RE: Radon Test Results, Prentis II Apartments, 15100 West 10 Mile Road, Oak Park,

Michigan (ASTI Project No. 4-8516) Dear Ms. Heinrich: ASTI Environmental (ASTI) was retained by Prentis II JSL LDHA LP to complete radon testing for the above referenced property (Property). Radon testing was conducted with regard to securing a US Department of Housing and Urban Development (HUD) 223(f) FHA loan. The testing was conducted in accordance with HUD Notice 2013-03 guidelines, and the American Association of Radon Scientists and Technologists’ (AARST), ANSI/MAMF-2012, Protocol for Conducting Radon and Radon Decay Product Measurements in Multifamily Buildings. ASTI acknowledges that Prentis II JSL LDHA LP, Red Capital, and HUD may rely upon this letter and its conclusions. The Property is located at the above referenced address in Oak Park, Michigan, which is located in EPA Radon Zone 2. The Property includes one 6-story apartment building with 11 ground-contact residential units. Previous radon testing was completed in 2013 at the Property and one radon mitigation system was installed to address elevated concentrations of radon previously detected in Unit 124. Testing was conducted in all ground-contact residential units (11) and 10% of the upper floor units (9) during the period of January 19 through January 23, 2017. In addition, quality control measurements included 10% (2) duplicates and 5% (1) blanks. One Air-Chek Foil Bag Test Kit (AC/NRSB Device Code 10333) was placed in each of the ground-contact residential units and selected upper floor units. Each test kit was placed at breathing level, approximately 5-6 feet above the floor. In addition, two duplicate test kits and one blank were also placed and analyzed. A table summarizing the testing results is attached (Attachment A). Radon laboratory analytical results were below the EPA Action Level of 4.0 pCi/L at all, but one of the locations tested. A radon concentration was detected at 4.6 pCi/L in Unit 137. The laboratory reports provided by Air-Chek can be found in Attachment B. Based on the results of the testing at the Property, it appears that the concentrations of radon entering the units are minimal with the exception of Unit 137. ASTI recommends that additional testing be performed in Unit 137 to identify if mitigation is necessary. Another option is to

Prentis II – Radon Testing ASTI Project 4-8516

proceed directly to radon mitigation in order to address the elevated concentration detected in Unit 137. If I may be of any further assistance in this matter, please contact me at (800) 395-2784. Sincerely, ASTI Environmental

Penelope Beamer Property Services Group Radon Measurement Specialist NRSB Certification No. 15SS012 Attachments

A Table – Radon Test Results B Laboratory Analysis Reports C Radon Certification

Prentis II – Radon Testing ASTI Project 4-8516

Attachment A

Table – Radon Test Results

Start Date End Date (pCi/L)Variance (±pCi/L)

Blank 1 1 1/19/2017 1/23/2017 < 0.3 0.2121 1 1/19/2017 1/23/2017 2.5 0.3

122-a 1 1/19/2017 1/23/2017 0.9 0.2122-b 1 1/19/2017 1/23/2017 1.2 0.3123 1 1/19/2017 1/23/2017 0.6 0.2124 1 1/19/2017 1/23/2017 0.8 0.3125 1 1/19/2017 1/23/2017 2.4 0.3126 1 1/19/2017 1/23/2017 1.7 0.3127 1 1/19/2017 1/23/2017 1 0.3128 1 1/19/2017 1/23/2017 2.8 0.3

136-a 1 1/19/2017 1/23/2017 2.5 0.3136-b 1 1/19/2017 1/23/2017 2.2 0.3137 1 1/19/2017 1/23/2017 4.6 0.4138 1 1/19/2017 1/23/2017 3.1 0.3223 2 1/19/2017 1/23/2017 < 0.3 0.2236 2 1/19/2017 1/23/2017 < 0.3 0.2328 3 1/19/2017 1/23/2017 0.7 0.3334 3 1/19/2017 1/23/2017 0.6 0.2422 4 1/19/2017 1/23/2017 1.1 0.3437 4 1/19/2017 1/23/2017 < 0.3 0.3529 5 1/19/2017 1/23/2017 < 0.3 0.2536 5 1/19/2017 1/23/2017 < 0.3 0.3631 6 1/19/2017 1/23/2017 0.6 0.3

-Bolded & shaded values indicate results equal to or greater than the EPA Action Level of 4.0 pCi/L. -Samples ending in -a & -b indicate duplicate samples placed side by side

Unit Tested

Floor Tested

Dates Sampled Test Results

Radon Test ResultsPrentis II ApartmentsOak Park, Michigan

ASTI Project No. 4-8516

Prentis II – Radon Testing ASTI Project 4-8516

Attachment B

Laboratory Analysis Reports

January 25, 2017 ** LABORATORY ANALYSIS REPORT **

Radon test result report for:PRENTIS II15100 W. 10 MILE RD.

Kit # Room Id Started Ended pCi/L Analyzed7145247 111 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am < 0.3 2017-01-257145218 121 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 2.5 ± 0.3 2017-01-257145215 122 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 0.9 ± 0.2 2017-01-257145217 122 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 1.2 ± 0.3 2017-01-257145232 123 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 0.6 ± 0.2 2017-01-257145227 124 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 0.8 ± 0.3 2017-01-257145226 125 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 2.4 ± 0.3 2017-01-257145233 126 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 1.7 ± 0.3 2017-01-257145235 127 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 1.0 ± 0.3 2017-01-257145231 128 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 2.8 ± 0.3 2017-01-257145237 136 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 2.2 ± 0.3 2017-01-257145236 136 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 2.5 ± 0.3 2017-01-257836098 137 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 4.6 ± 0.4 2017-01-257145228 138 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 3.1 ± 0.3 2017-01-257145212 223 2017-01-19 @ 10:00 am 2017-01-23 @ 9:00 am < 0.3 2017-01-257836088 236 2017-01-19 @ 10:00 am 2017-01-23 @ 9:00 am < 0.3 2017-01-257145222 328 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 0.7 ± 0.3 2017-01-257145230 334 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 0.6 ± 0.2 2017-01-257145234 422 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 1.1 ± 0.3 2017-01-257145229 437 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am < 0.3 2017-01-257145225 529 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am < 0.3 2017-01-257145223 536 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am < 0.3 2017-01-257145224 631 2017-01-19 @ 9:00 am 2017-01-23 @ 9:00 am 0.6 ± 0.3 2017-01-25

Air Chek, Inc. 1936 Butler Bridge Rd, Mills River, NC 28759-3892 Phone: (828) 684-0893 Fax: (828) 684-8498

Prentis II – Radon Testing ASTI Project 4-8516

Attachment C

Radon Certification