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V <br /> Limited Environmental Investigation May 15, 1990 <br /> ARCO Service Station 6100, Trac , California <br /> y AGSM 30041-1W <br /> a Drill two soil borings to approximately 20 feet in the area where a new tank <br /> cavity may be excavated. <br /> o Collect relatively undisturbed soil samO-Is from each boring at 5400t intervals, <br /> or other appropriate intervals, from the ground surface to the total baring <br /> - depth and classify the samples according to the Unified Soil Classification <br /> System. <br /> ' o Collect four discrete soil samples from the stockpiled drill cuttings to be <br /> composited into one sample for analyses to evaluate disposal options. ? <br /> a Analyze soil sample for total petroleum hydrocarbons as gasoline(TPHg)and <br /> benzene, toluene, ethylbenzene, and total xylene isomers (BTEX). Soil i <br /> samples collected nearest to the leaded gasoline tanks will be analyzed for <br /> organic lead I <br /> s o Backfill borings with a slurry of cement, bentonite, and water. <br /> o Prepare a report including our interpretations, and conclusions. <br /> FIELD PROCEDURES I <br /> Safety Plan <br /> t <br /> The enclosed site safety plan(Applied GeoSystems,May 11,1990)describes the basic safety <br /> requirements for the drilling of soil borings at the work site. The safety plan is applicable ' <br /> to personnel of Applied GeoSystems and to subcontractors of Applied GeoSystems. The <br /> F <br /> Applied GeoSystems geologist will be the Site Safety Officer. Personnel at the site will be <br /> F <br /> informed of the contents of the site safety plan before work begins. A copy of the plan will <br /> be kept at the work site and will be available for reference by appropriate parties during <br /> the work. <br /> '--.4��/ped Geo�yste�s <br />