30 April 2017 Revised 15 May 2017

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1 30 April 2017 Revised 15 May 2017 First Industrial, L.P. First Industrial Realty Trust, Inc. c/o Mr. Daniel A. Weis Advantage Environmental Consultants, LLC 145 Vallecitos De Oro, Suite 201 San Marcos, California Subject: Updated Paleontological Resource and Mitigation Monitoring Assessment, First Perry Logistics Center property, city of Perris, Riverside County, California (APNs and , -003, and -009) Dear Mr. Weis: Introduction and Site Location: An updated paleontological resource and mitigation monitoring assessment has been completed for the First Perry Logistics Center project site in the city of Perris, west of the Perris Reservoir in Riverside County, California (Attachments 1 and 2). The acre property (Assessor s Parcel Numbers [APNs] , and , -003, and -009) is located at the southwest corner of Perry Street and Redlands Avenue. The site is currently undeveloped, but probably experienced at least limited agricultural use in its history. On the U.S. Geological Survey 7.5-minute, 1:24,000-scale Perris, California topographic quadrangle map, the property is located in the northern half of the southeast quarter of the southwest quarter of Section 5, Township 4 South, Range 3 West, San Bernardino Base and Meridian (Attachment 2). Grading and construction plans for the project were not available; however, we understand it will involve construction of a single slab-on-grade warehouse building with office space, truck and automobile parking areas, and an interim drainage channel along the north side of the Ramona Expressway between Redlands Avenue and the Perris Valley Storm Drain. Proposed depths of over-excavation across the site, the depths of any footing excavations, or the depth and extent of the proposed drainage channel construction were not available.

2 Brian F. Smith and Associates, Inc. Page 2 Brian F. Smith and Associates, Inc. (BFSA) has been tasked with evaluating a previous paleontological resource assessment of the property by AECOM (Stewart, 2016) and updating both the resource and mitigation monitoring assessments. In his paleontological assessment of the property, Dr. Stewart (2016) conducted a pedestrian survey of the property searching for possible fossils exposed at the surface, and solicited a collections and records search of the Vertebrate Paleontology Section of the Natural History Museum of Los Angeles County (LACM) in Los Angeles. The records search report by Dr. S.A. McLeod in 2016 has not been seen, but is reported not to have identified any previously recorded fossil localities on the subject property, nor within at least a one-mile radius of it. Based on the reported geologic units in the area, and the advice provided by Dr. McLeod, Stewart (2016) concluded that a paleontological mitigation plan be prepared and implemented..., which would include monitoring of excavations with potential to disturb Pleistocene sediments, testing of sediments for microvertebrate fossils, preparation and curation of specimens collected, and preparation of a final report in accordance with the [draft] guidelines of the Society of Vertebrate Paleontology. We agree with Dr. Stewart s paleontological resource assessment of the First Perry Logistics Center project site, but expand on the specific elements that will need to be addressed in the paleontological mitigation and monitoring process. Geology: The geology of the project site and immediately surrounding areas is shown on the published geologic map of the Perris quadrangle (Attachment 3, after Morton, 2003, Preliminary geologic map of the Perris 7.5' quadrangle, Riverside County, California). The map indicates that the project site is located on Holocene ( modern ) and upper Pleistocene (10,000 to perhaps 100,000-year-old) young alluvial valley deposits (Qyv sa, shown in light yellow on Attachment 3), which overlie older, lower Pleistocene (approximately 1.8 million to perhaps 200,000 to 300,000-year-old) very old alluvial fan deposits (Qvof a, shown in light brown on Attachment 3). A geotechnical report prepared for the project (NorCal Engineering 2016) was provided that identified one foot of topsoil and/or fill overlying natural soils (clayey sandy silt) to a depth of 41 feet below ground level, but did not comment on the age of the sediments (i.e., whether or not they were Holocene [ modern ] in age, or older, being early to late Pleistocene in age). Tucker and Burkholder (2016, B1 boring log) do, however, note an increase of blow counts from 15 to 19 for sediments below a depth of 25 feet, blow counts of 25 at 25 and 30 foot depths, and a blow count of greater than 50 at depths of 35 and 41 feet, suggesting increased compaction or induration possibly due to increased age (Pleistocene?) of sediments below a depth of 25 feet. The age of these sediments is important in determining if they should be accorded a Low paleontological sensitivity (Holocene) or a High paleontological sensitivity (Pleistocene).

3 Brian F. Smith and Associates, Inc. Page 3 Paleontological Sensitivity: A paleontological sensitivity map generated by the Riverside County Land Information System in April of 2017 (Attachment 4) ranks the entire project area as having a High Paleontological Potential/Sensitivity (High B), which is based on [the presence of] geologic formations or mappable rock units that contain fossilized body elements, and trace fossils such as tracks, nests and eggs. These fossils occur on or below the surface. The category High B indicates that fossils are likely to be encountered at or below four feet of depth, and may be impacted during excavation by construction activities. Alluvial valley sediments and very old alluvial fan sediments with a High Potential/Sensitivity (High B) to yield nonrenewable paleontological resources (i.e., fossils) are shown in amber tint on Attachment 4. The Conservation Element of the City of Perris General Plan, adopted by the City Council on February 18, 2008, assigns a Low to High Paleontological Sensitivity to this area of the city, where younger alluvium overlies older valley alluvium and older alluvial fan deposits at depth. Paleontological Resources: No previously recorded fossil localities are known from the First Perry Logistics Center project site or within a one-mile radius of the site based on a previous paleontological literature review and a collections and records search conducted by the Geological Sciences Division of the San Bernardino County Museum (SBCM) in Redlands, California for the Stratford Ranch project site, which encompassed threefourths of Section 5 and all of the current project site (Scott, 2005, attached). Based on this report and another for a project located on very old alluvial fan sediments (Scott, 2015, attached), the very old Pleistocene alluvial fan deposits (Qvof a on Attachment 3) that directly underlie the younger alluvial valley sediments have a high potential to contain significant nonrenewable paleontological resources, and are thus assigned a high paleontological resource sensitivity (Scott, 2005, 2015; McLeod, in Stewart, 2016). Similar older Pleistocene sediments throughout the lowland (valley) areas of western Riverside County and the Inland Empire have been reported to yield significant fossils of extinct terrestrial mammals from the last Ice Age (see references in Scott, 2015), such as mammoths, mastodons, giant ground sloths, dire wolves, short-faced bears, saber-toothed cats, large and small horses, camels, and bison. The earlier collections and records search report for the Stratford Ranch project (Scott, 2005), however, did not identify any nearby fossil localities within the boundaries of that project site, nor within at least one mile in any direction. The closest recorded fossil localities may be those reported by the San Bernardino County Museum (localities SBCM and ; in Scott, 2013, attached) from Pleistocene older alluvium near the Lakeview Hot Springs area on the southeast side of the Perris Reservoir. Fossil vertebrates collected from these localities included mammoths, extinct horses, and extinct bison. In another report, Reynolds (2004)

4 Brian F. Smith and Associates, Inc. Page 4 reported fossil Bison from a location approximately five to six miles northeast of the current project site from a depth of 17 feet below the ground surface, suggesting that they were from Pleistocene older alluvial or older alluvial fan sediments. Recommendations: Because of the High paleontological sensitivity (High B) assigned to the lower Pleistocene very old alluvial fan deposits that underlie the younger Holocene and upper Pleistocene sediments mapped across the site, and without any geologic information that defines the depth of the contact between the older and younger alluvial deposits, a Paleontological Resource Impact Mitigation Monitoring Program (PRIMMP) should be prepared prior to issuance of a grading permit for the project. The PRIMMP should call for full-time paleontological monitoring of mass grading and excavation activities that exceed three (3) feet in depth (Mitigation Measure MM Cult 2). Implementation of the PRIMMP and mitigation measures outlined in Mitigation Measure MM Cult 2 would reduce any potential adverse impacts (loss or destruction) to nonrenewable paleontological resources (i.e., fossils) to a level less than significant. If it can be shown that any grading and excavation activities will not impact the very old alluvial fan sediments below the site, then paleontological monitoring need not be required and is not recommended. The mitigation program to be outlined in the PRIMMP, if deemed to be required, should be consistent with the provisions of the California Environmental Quality Act (CEQA), regulations currently implemented by the City of Perris (as the lead agency for the project), the County of Riverside, and the proposed guidelines of the Society of Vertebrate Paleontology. A typical paleontological mitigation monitoring and reporting program (MMRP) is appended to this letter. If you have any questions concerning this evaluation, please feel free to contact us at our Poway address. Thank you for the opportunity to have provided paleontological services for this project.

6 Brian F. Smith and Associates, Inc. Page 6 References: NorCal Engineering, Geotechnical investigation, proposed office/warehouse development, southwest corner Perry Street and Redlands Avenue, Perris, California. Unpublished geotechnical report prepared for First Industrial Realty Trust, El Segundo, by NorCal Engineering, Los Alamitos. McLeod, S. A Paleontological resources for the proposed First Industrial Redlands project. Unpublished letter report prepared for AECOM, La Jolla, by the Section of Vertebrate Paleontology, Natural History Museum of Los Angeles County, Los Angeles. [Not seen.] Morton, D. M Preliminary geologic map of the Perris 7.5' quadrangle, Riverside County, California: U. S. Geological Survey, Open-File Report : 1 map sheet with text, scale 1:24,000. Reynolds, R. E Paleontological resource investigation, Moreno Highlands fault investigation. In unpublished geologic report prepared by Leighton & Associates, 2004, Preliminary fault investigation, Tentative Tract Map No , Moreno Highlands, City of Moreno Valley, Project No Scott, E. G Paleontology literature and records review, Stratford Ranch project (BFSA # ), Perris region, Riverside County, California. Unpublished report prepared for Brian F. Smith and Associates, Poway, by the Division of Geological Sciences, San Bernardino County Museum, Redlands. Scott, E. G Paleontology literature and records review, Ecos Nuevo project, Lakeview Hot Springs region, Riverside County, California. Unpublished report prepared for Brian F. Smith and Associates, Inc., Poway, by the Division of Geological Sciences, San Bernardino County Museum, Redlands. Scott, E. G Paleontology literature and records review, Moreno Valley Logistics Center, city of Moreno Valley, Riverside County, California. Unpublished report prepared for Brian F. Smith and Associates, Inc., Poway, by the Division of Geological Sciences, San Bernardino County Museum, Redlands. Stewart, J. D Paleontological resources assessment of the Redlands project, Riverside County, California. Unpublished report prepared for First Industrial, L.P., by AECOM, La Jolla.

7 Brian F. Smith and Associates, Inc. Page 7 Paleontological Mitigation Monitoring and Reporting Program (MMRP) First Perry Logistics Center Project (APNs , and , -003, and -009) 1. Monitoring of mass grading and excavation activities in areas identified as likely to contain paleontological resources by a qualified paleontologist or paleontological monitor. Full-time monitoring will be conducted in areas of grading or excavation in undisturbed, young alluvial valley sediments (Qyv sa on Attachment 3) and underlying very old alluvial fan sediments (Qvof a on Attachment 3) if encountered at depth. Paleontological monitors will be equipped to salvage fossils as they are unearthed to avoid construction delays and to remove samples of sediments that are likely to contain the remains of small fossil invertebrates and vertebrates. The monitor must be empowered to temporarily halt or divert equipment to allow for the removal of abundant or large specimens in a timely manner. Monitoring may be reduced if the potentially fossiliferous units are not present in the subsurface, or if are present, are determined upon exposure and examination by qualified paleontological personnel to have a low potential to contain or yield fossil resources. 2. Preparation of recovered specimens to a point of identification and permanent preservation, including screen washing sediments to recover small invertebrates and vertebrates, if necessary. Preparation of individual vertebrate fossils is often more timeconsuming than for accumulations of invertebrate fossils. 3. Identification and curation of specimens into a professional, accredited public museum repository with a commitment to archival conservation and permanent retrievable storage. Pursuant to the County of Riverside s SABER Policy for recovered fossils, they should, by preference, be directed to (deposited at) the Western Science Center Museum, 2345 Searl Parkway, Hemet, California The paleontological program should include a written repository agreement prior to the initiation of mitigation activities. 4. Preparation of a final monitoring and mitigation report of findings and significance, including lists of all fossils recovered and necessary maps and graphics to accurately record their original location. The report, when submitted to the appropriate lead agency (City of Perris), will signify satisfactory completion of the project program to mitigate impacts to any paleontological resources.

1 November Dear Dan:

1 November Dear Dan: 1 November 2017 Mr. Daniel P. Walsh, CEG 2413 Riverside County Planning Department Transportation and Land Management Agency 4080 Lemon Street, 12 th Floor Riverside, California 92501 Subject: Paleontological