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n <br /> it �r <br /> PACIFIC <br /> ENVIRONMENTAL <br /> • GROUP INC <br /> April 18, 1996 <br /> Revised April 26, 1996 <br /> Project 310-040 5A <br /> Mr Bob Boust <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 440 <br /> San Ramon, California 94583 <br /> Re Remedial Action Performance Summary - First Quarter 1996 <br /> Unocal Service Station 2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Boust <br /> This letter presents a remedial action performance summary for the site referenced <br /> above A source test on the soil vapor extraction system was performed on January 17, <br /> 1996 The system was put into operation on February 12, 1996 after receiving approval <br /> from the air pollution control district Attachment A presents a system performance <br /> summary which includes key operating parameters Certified analytical reports with <br /> chatn-of-custody documentation are included as Attachment B, and field data sheets are <br /> presented as Attachment C The status of recent remedial activities is presented below <br /> Recent Remedial Activities <br /> Pacific Environmental Group, Inc (PACIFIC) performed the following remedial activi- <br /> ties during the first quarter of 1996 <br /> • Performed source test on soil vapor extraction (SVE) system as required by the San <br /> Joaquin Valley Unified Air Pollution Control District (SJVUA.PCD) <br /> • Received approval from SJVUAPCD to operate system <br /> • Started up system and performed routine maintenance and monitoring <br /> • Troubleshot internal combustion engine, replaced 12-volt battery for engine <br /> • Coordinated propane delivery schedule <br /> • <br /> 2025 Gateway Place, Suite 440, San Jose, California 95110 (408) 441-7500 FAX (408)441-7539 <br />