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INVESTIGATIVE BORING REPORT <br /> LA SALLE PROPERTY <br /> On June 8,2020,Asphalt Specialties Co.,Inc. (ASCI)oversaw the completion of sixteen(16)test <br /> hole borings (TH-1 through TH-16) at the La Salle Property located at 17043 County Road 394 <br /> (Site) in Weld County, Colorado (Attachment 1 — Figure 1). Borings were installed utilizing <br /> hollow-stem auger (HSA) drilling method by Dakota Drilling based in Denver, Colorado. The <br /> locations of the borings are presented in Attachment 1 — Figure 2. All borings were terminated <br /> once the underlying shale below the sand & gravel deposit was encountered. A summary of the <br /> information obtained from the borings is presented in Attachment 2 — Boring Summary Table. <br /> Boring logs are presented in Attachment 3. Photographs of the representative sand & gravel <br /> material encountered at the Site are presented in Attachment 4. Composite samples of sand & <br /> gravel deposit encountered were collected from five (5) borings (TH-1, TH-4, TH-6, TH-9, and <br /> TH-11) and submitted to ASCI's laboratory for gradation analysis. Results of the gradation <br /> analyses are presented in Attachment 5. <br /> Attachments: <br /> Attachment 1 —Figures <br /> Attachment 2—Boring Summary Table <br /> Attachment 3—Boring Logs <br /> Attachment 4—Photograph Log <br /> Attachment 5—Sample Gradation Analysis Reports <br />