NACC FAILED TO NOTIFY EPA OF THE CONSTRUCTION AND STARTUP OF CERTAIN PORTIONS OF THE FACILITY AND ALSO FAILED TO TIMELY PERFORM CERTAIN EMISSIONS TESTS, IN VIOLATION OF STANDARDS OF PERFORMANCE FOR NON-METALLIC MINERAL PROCESSING PLANTS AT 40 C.F.R. PART 60, SUBPART 000. NACC EXCEEDED PARTICULATE MATTER AND OPACITY LIMITS IN VIOLATION OF RULES 401, 404, AND 405 OF THE APPLICABLE IMPLEMENTATION PLAN FOR SAN BERNARDINO COUNTY AND SECTION 110 OF THE ACT. IN ADDITION, REGION 9 BELIEVES THAT NACC IS IN VIOLATION OF THE NITROGEN OXIDE LIMIT OF RULE 475 OF THE APPLICABLE IMPLEMENTATION PLAN, BUT WILL HAVE TO FURTHER DEVELOP THIS VIOLATION TO SUBSTANTIATE THAT RULE 475 IS APPLICABLE TO THIS SOURCE. NACC HAS SINCE SUBMITTED TEST DATA THAT DEMONSTRATES COMPLIANCE WITH THE PARTICULATE LIMITS OF RULE 404 AND 405 AND HAS SUBMITTED THE APPROPRIATE NOITICES AND PERFORMED TESTS AS REQUIRED BY NSPS SUBPART 000. IF RULE 475 IS APPLICABLE TO THE NACC, NACC CONTINUES TO OPERATE IN VIOLATION OF RULE 475 AT TURBINE #4 IN THE WESTEND PLANT. IF REGION 9 SUCCEEDS IN ESTABLISHING A VIOLATION AT WESTEND TURBINE #4, REGION 9 SEEKS TO REQUIRE NACC TO INSTALL APPROPRIATE CONTROL TECHNOLOGY AT TURBINE #4. AT THIS TIME, REGION 9 BELIEVES THAT SUCH CONTROL WOULD BE STEAM INJECTION. REGION 9 REQUESTED T