ARCHIVED REPORTS XR0000867 - Laserfiche WebLink

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from the slant bore at Tan* than stated in the original workplan • SAMPLE HANDLING AND ANALYSIS All samples were taken with a standard split spoon sampler inside an 8" hollow stem auger with BX brass sample tubes Each tube was extracted from the sampler, labeled, and stored on ace by the author of this report Samples were transported under chain of custody to Sherwood Labs for analysis Water samples from the MW#1 were retrieved by Del-Tech Geotechnical Support Services and transported under chain of custody to Sherwood Labs for analysis All samples were analyzed by EPA methods 8020 Two samples from each bore hole were analyzed for EPA method 8010 Samples from the bore hole at Tank #2(gasoline tank) were analyzed for EPA method 8015 RESULTS OF SOIL ANALYSIS The slant bore hole under Tank #1 produced samples that contained various levels of BETX as a contaminate with the exception of the samples taken at 20 feet and 75 feet, which were relatively void of any BETX The sample from 75 feet is below the water table Samples taken from the monitoring well showed various levels of BETX in the top twenty feet of the bore hole A small amount of Xylene was present in the remaining samples of the monitoring well (see attached recap of the analysis results) RESULTS OF WATER ANALYSIS FROM MW #1 MW 41 had a water ground water table at 48 58 feet from the surface at the time the samples were taken Analysis by Sherwood Labs and Associated Laboratories on the water sample indicated a small amount of BETX present (see laboratory reports) CONCLUSIONS FROM THE PHASE 1 INVESTIGATION The slant bore hole under the Tank 41 shows evidence of contamination from the top ten feet of depth to the water table at fifty feet below the surface The contamination was present the frill length of the slant bore hole Most likely the contamination has spread horizontally twenty-five feet in all directions from the tank and vertically to the water table The bore hole at Tank#2 showed gasoline contamination to a vertical depth of twenty-five to thirty feet The gasoline contamination is high in the first sample and much lower in proceeding samples The area affected by the gasoline contamination is shallow and should not be considered a risk to the underground water supply Water sampled from the monitoring well at Tank#2 contained small amounts of BETX with 130 ppb of Total Petroleum Hydrocarbons The source of the petroleum hydrocarbons in the water most likely is not Tank 42 The chemical analysis of the water sample is completely different from the analysis of the soil above the water table Please contact this office should questions anse over the information in this report QQ,pFESsIpN Foo 1 E inee R1FENQ r 4�J GAG' y i y Ervin Rife nbii g, 'k" K 'r 2