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-� EXECUTIVE SUMMARY <br /> " d 25, 1991, TECs began its subsurface petroleum <br /> On June 24 anr he svjecatior. at tbt Property located at 275 <br /> hydrocarbon investigation <br /> Grant Line Road, Tracy, California. On Jure 24, tnree 20-foot deep <br /> exploratory soil borings {MW-1, MW-2, and ww-3) were installed for <br /> subsequent conversion to 2-inch OD monitoring wells. Soi�naiPthe <br /> were collected at 5-foot dspth intervals in each boring <br /> soil/groundwater interface was encountered, where an additional <br /> soil sample was collected. SB-2, SB-3 SH 4) were, four foo tadeep <br /> exploratory soil borings {SB-1, <br /> and sampled around the perimeter of the previously removed <br /> ain <br /> underground waste oil to Ies were Under sent opo ah State-certified <br /> procedure, the soil same <br /> analytical laboratory for analysis. <br /> the <br /> On July 17, 1991, after a ;ninimum Of 72 hours <br /> groundwater elapsedsince <br /> Ewere <br /> monitoring wells had been developed, and MW-3• Under proper <br /> collected from monitoring wells MW-1, -2, <br /> Chain of Custody procedures, the laboraoundwateratory for asamples,were sent to <br /> a State-certifie;ianalytical <br /> elevated <br /> Laboratory analytical results indicate the presence o rat the soil/groundwater <br /> concer.trations :'of petroleum hydrocarbons <br /> interface. in the northwest Hd and BTEX were rportion of the epnrted�inEsamples <br /> concentrations of TPHg,. TP , soil <br /> collected at a depth of nine feet in four T H he Wase detectedborings <br /> in this . portion of the property. Total <br /> g <br /> ` tions in excess of 1000 ppm in two of the samples. <br /> t elevated concentrations in <br /> concentrasoil <br /> oil and. Grease_ was of the five so51 borzngs: <br /> detected a. <br /> samples 'coll'3cted`from this depth in two <br /> A concentration of Total Oil and Grease of 200 ppm was detected in <br /> five f <br /> a soil sample collected from a deptheoproperty eet from the soil <br /> boring in the southeast p <br /> fie 'Qresence of petroleum ` hydrocarbons was. .also de= undwater <br /> giroundw.atetwo 0 <br /> r :samples collected ,from Laboratory analytif the three cal results <br /> inottitbririg:::wells M -1 'and ,MW-2) . 1500 PPb) , Toluene (6.0 PPP), <br /> of indicated the presence <br /> (360ppband 160 ppb, respectively) , and <br /> Xylenes l a ppb) , 0.5 m and 0.5 Ppb) in tha groundwater <br /> 'dotal Oil and Grease { FP <br /> samples. <br /> PAGE 1 <br /> -� 275 GRANT LINE ROAD <br /> 4 <br />