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ENVIRONMENTAL AUDIT INC. <br /> 1000-A ORTEGA WAY • PLACENTIA, CA 92870-7162 <br /> 714/632-8521 FAX: 714/632-6754 <br /> SENTBYA/RBORNE <br /> October 18 1999 <br /> Project No 1232 <br /> John Carlson <br /> Director, Community Development Department <br /> City of Stockton <br /> 345 North El Dorado Street <br /> Stockton, CA 95202-1997 <br /> SUBJECT: NOISE MITIGATION FOR REMEDIATION SYSTEM <br /> Montgomery Ward Auto Service Center <br /> 5400 Pacific Avenue, Stockton, CA <br /> Dear Mr. Carlson: <br /> In September 1999, Environmental Audit, Inc. (EAI), on behalf of Montgomery Ward, installed <br /> a soil and ground water remediation system at the above-referenced site. Remediation at the <br /> site is being completed pursuant to and in accordance with directions from the San Joaquin <br /> County Public Health Services, Environmental Health Division (County). Mr. Michael I furna <br /> (206/468-3454) is the County staff person responsible for the site. Costs associated with <br /> remediating the site are being reimbursed to Montgomery Ward by the State of California <br /> Underground Storage Tank Cleanup Fund (UST Fund). The remediation system was in talled <br /> pursuant to City of Stockton Building Division permit application number 99 00001893, issued <br /> on May 28, 1999. <br /> On October 6, 1999, EAI started-up the system to perform the efficiency testing required by the <br /> permit to construct issued for the system by the San Joaquin Valley Air Pollution Control <br /> District. During the testing, it became apparent that the noise generated by the system exceeds <br /> the 75 dBA limit specified by the City of Stockton for commercial areas. According to the <br /> manufactures specification, the noise level generated by the blower is 90 dBA. The equipment <br /> is located 5 feet from the property line and will operate continuously, 24-hours a day. <br /> To mitigate the excessive noise to an acceptable level, EAI proposes to reduce the revolutions <br /> per minute of the blower motor and install a sound enclosure around the blower and inlet and <br /> outlet silencers, and to install acoustic blankets on the fencing surrounding the equipment. On <br /> October 11, 1999, EAI forward to the UST Fund a pre-approval request to implement the noise <br /> mitigation measures outlined above. <br /> PLANNING,ENVIRONMENTAL ANALYSES AND <br /> HAZARDOUS SUBSTANCES MANAGEMENT AND REMEDIATION <br />