. (UNOFFICIAL TRANSLATION) (Revision 2015) Table of Contents Page 1. Audit Firm profile 1 2. Network firms of the Audit Firm 4 3. Internal management of the Audit Firm 5 4. Inspection results on quality control

Unofficial translation FORM 35-E2 Letter of Consent (Inspection of the director and executive’s qualification on the company’s request) Attention: Secretary General, the SEC Office Whereas I

million baht or 5.17%. The decrease is due to the market of Non-Destructive testing, Inspection and Certification testing and Mechanical testing services are not recover - Cost of service and administrative

the Company also had revenue from inspection service for turnaround of refinery and petrochemical customer. - Cost of service, distribution costs and administrative expense were 425.44 million baht

from construction and fabrication sector. And the Company also had revenue from inspection service for turnaround of refinery and petrochemical customer. - Cost of service and administrative expense were

Unofficial translation FORM 35-E3 Letter of Request for Checking the Director and Executive Qualification (Inspection of the director and executive’s qualification on the individual’s request

3.49 1.13 32.38% 3 - Construction 1,405.03 1,079.05 325.98 30.21% 4 - Testing and Inspection 78.24 57.22 21.02 36.74% 5 Cost of sales and services (2,029.13) (1,734.66) 294.47 16.98% Gross Profit 248.42

) (48.76%) 1 - Construction 556.10 343.54 212.56 61.87% 2 - Testing and Inspection 19.20 15.83 3.37 21.29% 3 Cost of sales and services (687.57) (494.89) 192.68 38.93% Gross Profit 80.26 56.52 23.74 42.00

(0.40) (22.99%) 3 - Construction 346.79 287.89 58.90 20.46% 4 - Testing and Inspection 21.40 13.89 7.51 54.07% 5 Cost of sales and services (502.26) (442.05) 60.21 13.62% Gross Profit 61.69 43.73 17.96

- Testing and Inspection 13.89 13.12 0.77 5.87% 3 Cost of sales and services (442.04) (406.41) 35.63 8.77% Gross Profit 43.74 30.54 13.20 43.22% Other income 3.89 3.28 0.61 18.60% 4 Profit before expenses