STC Enviromental Services Inc.

CRAIG G. TRIBLEY, P.G.

Vice President, Principal Geologist

EDUCATION

B.S., Geology, Northern Illinois University, 1981

REGISTRATIONS/LICENSES

Professional Geoscientist, License Number 2057

TCEQ LPST Corrective Action Project Manager, CAPM 00022

Registered Corrective Action Specialist, CAS No. 00010

TPH Licensed Asbestos Inspector (#60-0831)

EXPERIENCE

As one of the two principal founders of STC ENVIRONMENTAL SERVICES, INC. (STC), Mr. Tribley brings 25 years total experience to the firm. The last 22 years of experience are exclusive to the field of environmental waste management and environmental consulting services.

At STC, Mr. Tribley is the Managing Partner for all projects which include the following disciplines:

• Projects utilizing the Texas Risk Reduction Program – TRRP (30 TAC 350)

• All Projects Managed under the TCEQ’s VCP and IOP

• Detection and Mitigation of Methane from CSWML's

• RCRA NOV's and Compliance Audits

• CERCLA/RCRA RI/FS Projects

• Effluent Monitoring Studies

• TRI/Tier II Reporting

• Preparation, Implementation of SPCC and SWPP Plans

• Brownfield Assessments and Cleanups

• Phase II Assessments of commercial and industrial properties

Prior to the establishment of STC, Mr. Tribley was the Environmental Program Manger for Southwestern Laboratories, Inc. (SwL), San Antonio Environmental Office. His duties and responsibilities include the directing, scheduling, and coordination of all environmental projects for the San Antonio office. This included environmental site assessments, underground storage tank investigations, soil and ground water contamination studies, remedial investigations, feasibility studies, design of remediation systems for the removal of petroleum hydrocarbons in soil and groundwater, and hazardous and industrial waste management assessments.

Prior to his employment with SwL, Mr. Tribley was a Senior Geologist with Chen-Northern, Inc. and Chen & Associates, Inc.. His duties included field work and final report preparation for UST projects, ESA reports, and hazardous waste projects. In the field of portable gas chromatography, Mr. Tribley has three years experience in quantification of volatile hydrocarbons.

From 1984 to 1988, Mr. Tribley served as a Regional Manager for E.T. Technologies, Inc., a waste management and recovery firm. He was responsible for the operation and administration of an industrial waste disposal facility in Salt Lake City Utah. Other responsibilities included the management of ground water monitoring systems at waste facilities, hazardous waste disposal projects, and landfill design studies. In 1984, he was a key member in a project involving the removal and encapsulation of over 265,000 cubic yards of hazardous petroleum refinery sludge for a former Amoco Petroleum Company refinery in southern Kansas. The work included geotechnical testing as well as environmental testing for hazardous constituents.

Prior to 1984, Mr. Tribley served on the staff of a seismic oil exploration firm. He has a detailed knowledge of crew operation and seismic data collection techniques. This experience includes seismograph operation, management of the crew, and acquisition of permits. His experience includes work in Montana, Wyoming, Utah, and North Dakota.

OTHER TRAINING AND EXPERIENCE

TRRP Modules I, II, III, University of Houston/GSI April 2000

TNRCC Risk-Based Assessment Workshop, 02/02/96

TNRCC VCP Workshop, 06/17/96

UPRR Safety Training, 07/23/96

HAZWOPER 40-Hour Training

TRRP Guidance and Policy, GSI, November 2003

TNRCC PST Remediation Workshop, 11/04/96

Application of Health Risk Assm., NGWA, 1996

ASTM – RNA – Remediation of Groundwater – University of Houston – May 2002

DAVID O. SCHEIDING, P.E.

President and Principal Engineer

Asbestos Consultant/Lead Risk Assessor

Mold Consultant

EDUCATION

B.S., Aerospace Engineering, Iowa State University, 1964

M.S., Civil Engineering, University of Denver, 1973

MBA, Business, University of Utah, 1975

Honors: Member of Beta Gamma Sigma Scholastic Honorary

REGISTRATION/LICENSES

Professional Engineer: Texas #41662

Texas Mold Consultant - MAC0174

Texas Asbestos Consultant 10-5260

Texas Certified Lead Risk Assessor #2070187

EXPERIENCE

As one of the two principal founders of STC ENVIRONMENTAL SERVICES, INC., (STC) Mr. Scheiding brings over 42 years of total experience to the firm. The last eight 18 years of his experience have been in the environmental consulting services field providing full service environmental consulting including asbestos, mold and lead. Mr. Scheiding has personally completed over six hundred (600) Phase I Environmental Site Assessments.

Prior to the establishment of STC, Mr. Scheiding was the Environmental Division Manager for the San Antonio Environmental Office of Southwestern Laboratories, Inc. (SwL). His duties at SwL included the supervision of 30 employees that included engineers, scientists, field engineers, drill crews and environmental technicians. In addition, as Manager, Mr. Scheiding was responsible for all administrative functions including profit and loss, short and long range planning, engineering technical review, quality control and the supervision of all environmental consulting and drilling services provided by the SwL San Antonio office. Mr. Scheiding was the final approval authority for all formal reports published by the office. This included the technical review for Phase I, II, and III Environmental Site Assessments (ESAs); Underground Storage Tank (UST) closure reports; UST removal upgrade, and installation specifications; and engineering design for remediation systems.

Prior to his employment with SwL, Mr. Scheiding was the Texas Division Manager for Chen-Northern, Inc. In this position, Mr. Scheiding performed all of the duties that he performed at SwL, in addition to, preparing geotechnical engineering reports. Geotechnical duties included preparation of recommendations for foundation design based on intrusive subsurface soils investigations that were used to determine the engineering characteristics of the subsurface soils.

In 1989, Mr. Scheiding completed a 24 year career with the United States Air Force. His military experience included positions of progressively increasing leadership responsibilities within the engineering and program management fields. Mr. Scheiding was the Lead Structural Engineer for the C-5A aircraft where he was directly responsible for ensuring the structural integrity of the entire C-5A fleet for the Air Force. He was also the System Program Manager for the Air Force for eight different fleets of aircraft including the T-37, T-38, and F-106 aircraft. During his military career, Mr. Scheiding also served as F-111D Tactical Fighter Squadron Commander, Assistant Deputy Commander for Maintenance, and was a Forward Air Controller during the Vietnam conflict.

MEMBERSHIP IN ORGANIZATIONS

National Society of Professional Engineers

Texas Society of Professional Engineers

Air and Waste Management Association