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<br /> RcsuIts of Iritial Investigation and Work Plan December 18, 1990
<br /> ARCO Service Station No. 767, Lodi, California AGS 35048-4
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<br /> FIEI.I) PROCEDURES
<br /> afc 1
<br /> The Site Safety Plan (Appendix D) is tl:e basic safety requirements for the drilling of soil
<br /> borings at the work site. The safely plan is applicable to personnel of Applied GeoSystems
<br /> and to subcontractors of Applied GeoSystems. The Applied GeoSystems geologist will act
<br /> as the Site Safety Officer. Personnel at the site will be informed of the contents of the site
<br /> safety plan before work begins. A cony of the plan will be kept at the work site and will be
<br /> available for reference by appropriate parties during the work.
<br /> Fxcavation.of Ezistitnt�_ asolinc Tank vit
<br /> A geologist from,�-pplied GeoSystems will be onsite to observe excavation of the soil from
<br /> ® ! both tank cavities. Immediately following the removal of the three existing underground
<br /> storage tanks, the tank cavity will be excavated to a depth between z and 4 feet below the
<br /> former tanks to evaluate if hydrocarbons remain in place. During excaw"tion, the geologist
<br /> ® wi'l use a PM to characterize 'he relative I-,vels of hydrocarbons in the soil and note any
<br /> subjective evidence of'hydrocarbons such as obvious product odor and discoloration. Field
<br /> instruments such as the PID are useful for indicating reh.iive levels of hydrocarbon vapors.
<br /> but do not detect the concentration of hydrocarbons present with the same precision a--
<br /> laboratory
<br /> rlaboratory analyses.
<br /> We will collect two soil samples within 2 to 4 feet below the base of the former each tank.
<br /> If PSD readings are less than 50 ppmv,we will submit the soil samples to the laboratory for
<br /> analyses. If PID readings are greater than 50 ppmv,we will observe additional excavation
<br /> in the gasolin-c-tank cavity until PID readings are less than 50 ppmv ar.d submit these soil
<br /> samples to the laboratory. We will continue excavating only if laboratory results indicate
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<br /> Applied CenSystP-17rs -
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