10 May Rod Walls - Director Facilities New Construction, Sustainability Hays CISD IH 35 Kyle, Texas 78640

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1 10 May 2017 Rod Walls - Director Facilities New Construction, Sustainability Hays CISD IH 35 Kyle, Texas Re: Hays CISD Proposed ES15 Site, Buda Phase II Soil Sampling Dear Rod: Concern has been raised over previous soil sampling efforts on properties nearby to the ES15 site that have exhibited possible contamination by Arsenic and slightly elevated levels of other heavy metals (Chromium, Lead, and Selenium) compared to the Texas Specific Soils Background Concentration (TSSBC). Additionally, there were minimal detections of Volatile Organic Compounds (VOCs), but which were well below health effect levels. These concerns are well founded for construction of a planned elementary school facility on the ES15 site by Hays CISD where the potential exposure to children would be of paramount concern. Per your request, Horizon Environmental Services, Inc. (Horizon) has conducted soil sampling investigations on the ES15 property. A total of 10 composite soil samples were taken from 5 different corings at various locations within the proposed footprint of the school facility on 26 April Corings were advanced with a Geoprobe 7822DT push-probe machine (photos, Attachment B). Corings were advanced in 4 ft increments to a depth of restrictive penetration (highly consolidated material or rock) (generally 20 to 25 feet in depth) with soil samples composited from the 0-8 foot range (A) and from the lower foot range (B) in each core. A coring log is provided in Attachment C. Core samples were collected in Butyrate plastic liners and placed in sterile glass containers provided by the laboratory (photos, Attachment B). Samples were placed on ice and transported to AnalySys, Inc., 3512 Montopolis Drive, Austin, Texas for analysis. Soil samples were tested for total petroleum hydrocarbons (TPH); RCRA metals, including cadmium, chromium, lead, barium, mercury, selenium, silver, and arsenic; and volatile organic compounds (VOC), including BTEX. Previous coring locations for geotechnical investigations were utilized for this effort due to existing equipment access corridors through the brush on the site. Our coring locations corresponded to those of geotech cores as follows and indicated on Figure 1. Raba Kistner Core # Horizon Core # P2 B5 P3 B2 B1 1 A & B 2 A & B 3 A & B 4 A & B 5 A & B CORPORATE HEADQUARTERS 1507 South IH 35 Austin, Texas Fax An LJA Company

2 BBB Austin Hays UV 4 ^_ 35 S I T E Travis SITE LOCATION MAP Green Pastures P-4!? P-3!? H-3!? B-3!? B-2 H-4 B-1 B-4!?!? B-5 H-2!? H-5 B-6!? B-7!? H-1 P-2!? Country Road 104 Legend!? BORING HORIZON CORING PROPOSED PAVEMENT PROPOSED STRUCTURE P-1!? Old San Antonio µ INCH = 200 FEET FEET 8100 Cameron Road, Suite B-150 Austin, Texas (512) TEL (512) FAX TBPE Firm Number 3257 BORING LOCATION MAP HAYS CONSOLIDATED ISD ELEMENTARY SCHOOL NO. 15 SOUTH OF MANCHACA SPRINGS ROAD AT OLD SAN ANTONIO ROAD BUDA, TEXAS NOTE: This Drawing is Provided for Illustration Only, May Not be to Scale and is Not Suitable for Design or Construction Purposes HAYS COUNTY PROJECT No.: AAA ISSUE DATE: 03/08/2017 DRAWN BY: KRB CHECKED BY: RTS REVIEWED BY: YGT FIGURE 1

3 No groundwater was encountered in any of our cores. The previous geotechnical borings by Raba Kistner encountered shallow groundwater in the ft depth range just above bedrock. The Raba borings were conducted in February during a period of high rainfall. The several weeks preceding our investigations were relatively dry. Shallow groundwater in this area is temporary and transient in nature related to rainfall and soil percolation to a relatively impervious layer of bedrock. Percolated water may temporarily perch on top of the bedrock until it drains laterally with the gradient of the bedrock or finds fissures in the rock to percolate vertically. Permanent groundwater (aquifer) in this location is several hundred feet deep. RESULTS A summary table (Table 1) of laboratory results is provided below. The full laboratory analysis is provided in Attachment A. Laboratory results were compared to the total exposure Protective Concentration Limits (PCL) (health effects levels) for residential soils in the Texas Risk Reduction Program (TRRP) standards maintained by the Texas Commission on Environmental Quality. The sample results were also compared to the Texas Specific Soil Background Concentration (TSSBC) for various of the metals. It should be noted however that the TSSBC is merely the median concentration that various metals occur naturally in Texas soils. The comparison to the TSSBC only serves to indicate the degree of variance (plus or minus) for detected values for any of the metals compared to the median values naturally occurring in Texas soils. The TSSBC values are neither regulatory nor health effect levels and do not have significant meaning other than a bar to assess the normalcy of detected values of those metals. As can be seen from the results table, there were no exceedances of the total exposure PCLs (concentrations for concern for health effects) for any of the samples. All VOC and TPH were below laboratory detection limits. CONCLUSIONS None of the samples analyzed indicated any level of contamination of concern for health effects as compared to minimum regulatory levels for residential soils (TRRP-PCLs). All detected levels of metals (Arsenic, Barium, Chromium, and Lead) were at or below the naturally occurring median levels (TSSBC) of those metals in Texas soils. Therefore, it is our opinion that the soils on the subject site do not contain contamination of concern for health effects to construction workers during construction or students and faculty utilizing the future school facilities.

4 Please call with any questions. Sincerely, For Horizon Environmental Services, Inc. C. Lee Sherrod President

5 Sample Depth HAYS CISD ES15 SITE PHASE II SAMPLING RESULTS Arsenic/ ICP Barium/ ICP Horizon Environmental Services, Inc. METALS Cadmium/ ICP Chromium/ ICP Lead /ICP Mercury/ CVAA Selenium/ ICP Silver /ICP TOTAL PETROLEUM HYDROCARBONS VOLATILE ORGANIC COMPOUNDS 1-A 0-8 ft BQL 8.03 BQL 3.68 BQL BQL BQL BQL BQL BQL 1-B 8-20 ft BQL BQL BQL BQL BQL BQL 2-A 0-8 ft BQL BQL BQL BQL BQL BQL 2-B 8-20 ft BQL BQL BQL BQL BQL BQL 3-A 0-8 ft BQL BQL BQL BQL BQL BQL 3-B 8-20 ft BQL BQL BQL BQL BQL BQL 4-A 0-8 ft BQL BQL BQL BQL BQL BQL 4-B 8-20 ft BQL BQL BQL BQL BQL BQL 5-A 0-8 ft BQL BQL BQL BQL BQL BQL 5-B 8-20 ft BQL 5.96 BQL BQL BQL BQL BQL BQL TRRP Texas Risk Reduction Standards* TSSBC Texas Specific Soil Background Conc * (Total Protective Concentration Limit For Residential Soils) (TRRP-PCL) Indicates Exceedence of TRRP-PCL for Residential Soils BQL - Below Quantification Limits

6 ATTACHMENT A LABORATORY RESULTS

60 ATTACHMENT B PHOTOS

61 PHOTO 1: CORING MACHINE PHOTO 2: CORE SAMPLES

62 ATTACHMENT C CORING LOG

63 HAYS CISD SITE ES15 CORING LOG 26 April 2017 Core # 1: A B Core # 2: A B Core # 3: A B Core # 4: A B Core # 5: A B 0-4 feet Gravel and sandy clay - dry 4-8 feet Sandy caliche - moist 8-12 feet Alternating layers of gravel and clay - moist feet Alternating layers of gravel and clay - moist feet Restrictive below 16 ft coring discontinued 0-4 feet Dark clay - dry 4-8 feet Tan sandy clay slightly moist 8-12 feet Tan sandy clay slightly moist feet Tan sandy clay slightly moist feet Gravelly sandy clay dry (restrictive below 20.5 ft) 0-4 feet Dark clay with gravel - dry 4-8 feet Caliche gravel and sandy clay - dry 8-12 feet stiff red clay slightly moist feet Stiff red clay with gravel lenses - dry feet Stiff clay with gravel lenses dry (restrictive below 19 ft) 0-4 feet Black to red clay - dry 4-8 feet Red clay with gravel - dry 8-12 feet Red gravelly clay - dry feet Sandy caliche with gravel - dry feet Sandy caliche dry (small void encountered at 20 ft) 0-4 feet Stiff dark clay - dry 4-8 feet Light tan sandy clay below 5 ft - dry 8-12 feet Light tan sandy clay - dry feet Sandy caliche with gravel - dry feet Sandy caliche with gravel dry feet Sandy caliche with gravel moist near bottom (restrictive at 22.5 ft) CORPORATE HEADQUARTERS 1507 S Interstate 35 Austin, TX (512) An LJA Company

M E M O R A N D U M. Mr. Jonathan K. Thrasher, P.E., Mr. Ian Kinnear, P.E. (FL) PSI

M E M O R A N D U M. Mr. Jonathan K. Thrasher, P.E., Mr. Ian Kinnear, P.E. (FL) PSI M E M O R A N D U M TO: FROM: Mr. Mark Schilling Gulf Interstate Engineering Mr. Jonathan K. Thrasher, P.E., Mr. Ian Kinnear, P.E. (FL) PSI DATE: November 11, 2014 RE: Summary of Findings Geotechnical