I'm not sure if you're saying I should ignore these errors...
I'm using dumps from DB airaburst.
>postgres=# \l
         List of databases
    Name    |  Owner   | Encoding  
------------+----------+-----------
 airburst   | root     | SQL_ASCII
 lt_dev1    | postgres | UTF8
 lt_dev2    | postgres | UTF8
 lt_reports | postgres | UTF8
 postgres   | postgres | UTF8
 template0  | postgres | UTF8
 template1  | postgres | UTF8
(7 rows)
============================================
Looking at the dump of one table there...
--
-- PostgreSQL database dump
--
-- Started on 2008-02-25 12:28:48 PST
SET client_encoding = 'UTF8';
SET standard_conforming_strings = off;
SET check_function_bodies = false;
SET client_min_messages = warning;
SET escape_string_warning = off;
SET search_path = public, pg_catalog;
SET default_tablespace = '';
SET default_with_oids = false;
--
-- TOC entry 1455 (class 1259 OID 20378)
-- Dependencies: 1839 2
-- Name: board_posts; Type: TABLE; Schema: public; Owner: airburst; Tablespace: 
============================================
The error I get on trying to import it.
postgres@flexo:~/WORKING_DATA/airburst_tables$ psql lt_dev1 -f ./table_board_posts.sql 
SET
SET
SET
SET
SET
SET
SET
SET
CREATE TABLE
ALTER TABLE
psql:./table_board_posts.sql:248: ERROR:  invalid byte sequence for encoding "UTF8": 0x91
HINT:  This error can also happen if the byte sequence does not match the encoding expected by the server, which is controlled by "client_encoding".
CONTEXT:  COPY board_posts, line 8
CREATE INDEX
Thank you!