INDEPENDENT AUDITORS' REPORT

Tetra Tech, Inc.:

We have audited the accompanying consolidated balance sheets of Tetra Tech, Inc.
and its subsidiaries as of September 29, 1996 and October 1, 1995, and the
related consolidated statements of income, stockholders' equity, and cash flows
for each of the three years in the period ended September 29, 1996.  These
financial statements are the responsibility of the Company's management.  Our
responsibility is to express an opinion on these financial statements based on
our audits.

We conducted our audits in accordance with generally accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all
material respects, the financial position of Tetra Tech, Inc. and its
subsidiaries as of September 29, 1996 and October 1, 1995, and the results of
their operations and their cash flows for each of the three years in the period
ended September 29, 1996 in conformity with generally accepted accounting
principles.



DELOITTE & TOUCHE LLP


LOS ANGELES, CALIFORNIA
NOVEMBER 12, 1996





                                  EXHIBIT 99.1