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r J <br /> Chevron/South El Dorado 12 <br /> September 1990 <br /> HISTORICAL RESEARCH <br /> To explore the possibility that off-site contributors may <br /> have impacted the -dissolved gasoline hydrocarbons 'beneath the j <br /> site, research into the current and historical uses of the <br /> surrounding properties will be conducted. The research will <br /> include a review of available environmental records and an on- <br /> site investigation of the site vicinity. This research is <br /> designedto determine whether the adjacent properties have had <br /> underground storage tanks on the premises and whether any leaks <br /> have been documented. <br /> The past uses of the site 'and site vicinity will also be <br /> researched using aerial photographs on file at Pacific Aerial <br /> Surveys in Oakland, California. This data may identify <br /> properties in the site vicinity which were formerly used for the - <br /> refining ­ storage or sale of hazardous materials. <br /> PERMITTING 'AND REPORTING <br /> Upon approval of this work plan .from the STCLHD, permits <br /> will be obtained for the installation of four wells- and for <br /> encroachment into South El Dorado Street for the installation of <br /> the off-site well. The offices which issue the permits will be <br /> notified "at least 48 hours prior to the commencement of field <br /> operations and all permits will be on site while the field work, <br /> is being:.conducted. <br /> I <br /> Following the completion .of the field operations, an <br /> i <br /> assessment report will be generated. The -report will include <br /> drill logs, laboratory reports, potentiometric surface maps, <br /> dissolved- hydrocarbon concentration maps, and an analysis of <br /> the data. <br /> _�- GROU'NDWATER <br /> TECHNOLOGY,INC. <br /> �ij, <br />