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5608 N PERSHING AVE <br /> PAGE 10 <br /> FUEL TANK PIT <br /> Of the six soil samples obtained from underneath the former gasoline tanks only the western <br /> soil sample from the middle (regular) tank showed contamination at 15' BGS with TPH <br /> gasoline at 38 ppm,ethylbenzene at 0.057 ppm,and xylene at 0.19 ppm. Benzene and toluene <br /> were not detected at a detection limit of 0.005 ppm. <br /> PIPING <br /> Of the eight piping samples only one showed contamination with xylene at 0.048 ppm. All <br /> the other samples were nondetect at the appropriate detection limits. <br /> WASTE OIL PIT <br /> All the three soil samples obtained from the waste oil tank pit area showed contamination <br /> in the form of TPH gasoline,toluene, ethylbenzene, total oil and grease, Ca,Cr, Pb, Ni,Zn, <br /> and a variety of semi-volatile organics. <br /> 04-13-93 PHS/EHD receives WP for over-excavation of the former waste oil and gasoline tank pit <br /> areas. <br /> 04-23-93 Over-excavation of the waste oil tank pit this date. Finished excavation to approximately 16' <br /> BGS with apparently all discolored soil removed. Seven confirmation samples obtained. <br /> Soils being hauled off to Forward Landfill as it is removed. <br /> 04-26-93 Over-excavation of the gasoline tank pit area this date. Trenching by the western end of the <br /> former tanks showed contamination to 22' BGS in the middle area of the former tank pit. <br /> The side wall in this area was obviously also contaminated with soil discoloration and strong <br /> odors. <br /> 04-27-93 The tank pit was over-excavated to a total depth of 31' BGS this date. Contamination was <br /> still evident at this depth. The full vertical and horizontal extent of the contamination is still <br /> not known. Depth to water this date is approximately 37' BGS. It was decided to stop the <br /> excavation and decide the best way to address the contamination problem. <br /> 04-30-93 The tank pit was backfilled to approximately 16'-1T BGS pending further work- <br /> 05-03-93 Meeting held today between RP,PO and PHS/EHD. Discussed at the meeting were several <br /> cleanup alternatives to remediate the contamination found at the bottom of the former <br /> gasoline tank pit area. A major over-excavation was discussed as the quickest alternative as <br /> far as a site closure was concerned. <br /> 05-11-93 The hoists used in the bay of the former service station were removed this date with no <br /> evidence of contamination noted. The area of the former waste oil sump was exposed this <br /> date also and no contamination noted there as well. The area immediately west of the former <br /> western dispenser area showed discolored and odorous soil. The over-excavation of the <br /> former tank pit area was begun this date and continued through to 05-20-93. <br /> 05-27-93 Monitoring well MW#7 destroyed this date by removal with a backhoe as it sustained <br /> irreparable damage during the excavation. This area will be backfilled along with the <br /> excavation. <br /> 06-24-93 PHS/EHD receives soil sample results from the waste oil and gasoline tank pit areas. <br />