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ACTON • <br /> MICKELSON • ;;'� Yui <br /> van DAM, INC. <br /> Consulting Scientists, Engineers,and'Geo fists <br /> May 18, 1994 <br /> Mr. Kenneth Earnest <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 19042.02 <br /> Subject: Work Plan to Conduct Additional Subsurface Investigation <br /> Beacon Cardlock Station No. 610 <br /> 3300 Waterloo Road, Stockton, California <br /> Dear Mr. Earnest: <br /> This work plan has been prepared to describe proposed additional subsurface investigation at <br /> Beacon Cardlock Station No. 610 (site) located at 3300 Waterloo Road, Stockton, San Joaquin <br /> County, California (Figures 1 and 2). The investigation is intenders to better assess the presence <br /> or absence of petroleum hydrocarbon constituents, including total petroleum hydrocarbons as <br /> gasoline and diesel (TPHg and TPHd, respectively), and benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX), in the soil beneath the site. This work plan also covers the installation of <br /> vadose zone wells for possible future remeditation use. This work plan also describes methods <br /> to be used to replace an existing monitoring well (MW-7) which was damaged during <br /> underground storage tank removal activities. <br /> Six ground water monitoring wells, three of which are now dry, have been installed previously <br /> at the site. Ground water is currently approximately 65 feet below grade. Soil reported to <br /> contain petroleum hydrocarbon constituents was excavated during underground storage tank <br /> removal activities (Figures 2, 3, and 4), as reported in the AMV report "Tank Closure Report, <br /> Beacon Cardlock#610," dated November 22, 1993. Cross-sections of the subsurface in the area <br /> of the former underground storage tanks illustrating subsurface conditions encountered and the <br /> concentrations of TPHg, TPHd, and benzene reported during previous investigations are shown <br /> on Figures 3 and 4. Concentrations of petroleum hydrocarbon constituents encountered during <br /> the overexcavation of the underground storage tank basin are presented in Table 1. Locations <br /> of the tank pit soil samples are illustrated on Figure 5. <br /> Scope of Work <br /> The proposed scope of work includes the following: <br /> • Acquisition of permits to drill the soil borings and possibly install vadose zone wells. <br /> LRPTDOS.MAP <br /> 4511 Golden Foothill Parkway, Suite 1 (916)939-7550 <br /> El Dorado Hills,California 95762 Fax(916)939-7570 <br />