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Monitoring Well Installation and Soil Vapor Investigation Work Plan BOULEVARD AUTOMOTIVE SERVICE 2151 Country Club Boulevard, Stockton,California 1.0. INTRODUCTION At the request of Mr. John Parker of Boulevard Automotive Service (BAS), Advanced GeoEnvironmental,Inc(AGE)has prepared this work plan for the site located at 2151 Country Club Boulevard, Stockton, California(site). The work plan provides the scope of work and procedures for the proposed installation and development of thirteen ground water monitoring wells, and the collection and laboratory analysis of soil and ground water samples;additionally,the scope of work includes an active soil vapor investigation.The location of the site is illustrated on Figure 1.A plan of the site is illustrated on Figure 2. The San Joaquin County Environmental Health Department(SJCEHD)has directed by letter(dated 03 January 2007) that a work plan be prepared by 19 January 2007 to investigate the lateral and vertical extent of petroleum-impact and to evaluate hydrocarbon vapor intrusion at the site (Appendix A).This work plan has been prepared in accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the investigation of underground storage tanks (UST) sites. AGE has previously interpreted off-site data to identify six informal hydrogeologic flow units (hydrogeologic units 1-6)between surface grade and 100 feet below surface grade(bsg) as having significant intervals of apparently porous, coarser grained soil separated by significant intervals of finer-grained,less permeable soil.Generally,Hydrogeologic Unit 1 (HU1)was identified at depths between 8 feet bsg(depth to first encountered ground water)and 35 feet bsg,HU2 was identified at depths between 35 feet bsg and 50 feet bsg, HU3 was identified at depths between 50 feet bsg and 70 feet bsg, HU4 was identified at depths between 70 feet and 84 feet bsg, HU5 was identified at depth s between 84 and 96 feet and HU6was identified at depths between 96 feet bsg and 100 feet bsg(Cone Penetrometer Testing Site Investigation - 3'd Quarter 2006, dated 10 November 2006). 2.0. SCOPE OF WORK On 29 December 2006, AGE met with the SJCEHD to discuss the status of the Boulevard Automotive Service investigation;following the meeting,it was decided that additional investigation was warranted in AGE's informal hydrogeologic unit 2 (between 35 and 50 feet) and in hydrogeologic unit 4(between 70 and 84 feet)from seven(7)additional locations.Generally,off-site dissolved petroleum hydrocarbons contamination extends from the site to the location of boring Pl 1, located on Franklyn Avenue.The contamination is not currently defined or monitored by repeatable sampling location in the lower hydrogeologic units. In accordance with the 29 December meeting directives, AGE is therefore proposing installation of thirteen additional ground water monitoring wells(MW-12 through MW-24); each well will be single-completed either through hydrogeologic units HU2 or HU4 to define and monitoring dissolved petroleum hydrocarbons. Advanced GeoEnvironmental,Inc.