L.A. Biz | Tetra Tech to buy Australian geotechnical engineering firm Coffey L.A. Biz Engineering services company Tetra Tech Inc. has agreed to buy Coffey International Ltd., Australia's first geotechnical engineering company. Pasadena-based Tetra Tech(Nasdaq: TTEK) didn't provide a total acquisition price, but said it has agreed to ... Tetra Tech to buy Australian geotech engineering firm Tetra Tech to Purchase Geotechnical Engineering Firm Coffey; Dan Batrack Comments |