Santa Ana College, 1976-1977
Orange Coast College, 1977-1978

Professional Affiliations and Notations

General Building Contractor - California B License 370591 with
C-6 Supplemental Classification, HIC
General Building Contractor - Arizona B-03 License 146347
General Building Contractor - Nevada B License 51509
Member of the American Society of Professional Estimators (ASPE)
Certified Professional Estimator (CPE) with the
American Society of Professional Estimators
Received Recognition for "Outstanding Expert Contribution"
Certified Construction Inspector
Certified Construction Project Manager


Licensed General Contractor since 1979

Over twenty eight years experience in the construction industry involving building design, construction project management, blueprint reading, and "hands on" experience in all building trades for the construction of residential and commercial buildings - including repairs, remodels, and new construction. Responsible for ensuring compliance of construction quality standards, building codes and regulations, and estimating cost of labor, materials and equipment.

Employed by California Building & Consulting, Inc. (CBC) for over seven years, culminating in the Chief Estimator position. In addition to estimating tasks and interfacing with architects and engineers, was responsible for overseeing estimating staff in preparation and coordination of estimates for construction and consulting projects.

CBC was a General Contractor in the State of California and Arizona specializing in the reconstruction of condominium and multi-family projects and consulting support. In 1997, CBC completed reconstruction totals exceeding 22,000 units repaired, 2,500 Cost of Repair Estimates, and over 4,000 Destructive Tests. Work emphasis was on reconstruction project management, preparation of bids, and Cost To Repair estimates. Projects typically ranged in value from $200,000 to $30,000,000, with the highest being $280,000,000.

D.L. Waller & Associates, Inc. (dba Waller + Opsal Consulting), founded in 1978 was incorporated November of 1997, and specializes in construction consulting, estimating and expert testimony. As a principal of Waller + Opsal, responsibilities include supervision and training of estimators and consulting department project coordination, in addition to consulting, testifying, and preparing cost estimates, defect matrices, allocation of responsibility and alternate repair methods.

Experienced as a consultant / expert witness for attorneys, homeowner associations, architects, engineers, developers, and insurance companies, in both plaintiff and defense capacities. Our case venue ranges from southern San Diego County to the Bay Area and Arizona and Nevada.

Have attended numerous mediations and testified in court and at depositions. Have served as an Independent Third Party Expert and Confidential Independent Estimator.

Served as a discipline specific expert in the development of Contractor's State License Board examination.

Partial List of Seminars and Training Courses Attended and Papers Authored

"Construction Defect Trial Seminar", San Diego Trial Lawyers Association, May 1992.

Technical paper, "How to Estimate Pre-Hung vs. Site Hung Doors", prepared for American Society of Professional Estimators, June 1995.

"Joint Cost Management Societies Symposium", American Society of Professional Estimators, October 1998.

"NCSBCS/NIST/HUD Joint Technical and Research Conference", November 1998.

"Geotechnical and Environmental Liability", Ninyo and Moore, March 1999.

"Sixth Annual Construction Defect Seminar", West Coast Casualty, May 1999.

"Concrete Design & Construction Seminar", Ninyo & Moore, June 2001.

"Construction Estimating Seminar for Attorneys", ASPE, February 2002, Panel Member/Speaker.

"Above Grade Clear Water Repellant Treatments", AIA, February 2002.

"Below Grade Waterproofing", AIA, February 2002.

"Keys to Quality EIFS Systems", AIA, February 2002.

"Low Slope Commercial Roofing Systems", AIA, February 2002.

"Moisture Management for Steel Stud Walls", AIA, February 2002.

"Mold: Environmental and Geotechnical Considerations", Ninyo & Moore, April 2002.

Presentation to American Society of Professional Estimators of "Ethics in Litigation Estimating", May 2002.

"Mold Remediation in Buildings", Environmental Testing and Technology, Inc., August 2002.