ARCHIVED REPORTS XR0001892 - Laserfiche WebLink

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EXECUTIVE SUMMARY ' The subject property is at 1645 Cherokee Lane, Stockton, California, north of the intersection of Cherokee Lane and Waterloo Road The subject property is in an area of mixed light-industrial and ' commercial buildings, it is part of a property used to repair railroad engines by the Central California Traction Company In January 1999, Thorpe Oil Company excavated and removed one 6,000-gallon gasoline underground storage tank (UST) and one 1,000-gallon diesel UST from the subject property ' One soil sample, collected from below the excavated diesel tank at 9 feet below surface grade (bsg), had 8,000 milligrams per kilogram (mg/kg) total petroleum hydrocarbons (TPH) as diesel, 0 33 mg/kg toluene, 0 740 mg/kg ethylbenzene, and 1,800 mg/kg total xylenes, benzene was below method detection limits ' Hydro-Environmental Technologies, Incorporated (HETI) reviewed the September 1999 URS Greiner Woodward Clyde (URSGWC) final report UST Investigation, 1645 Cherokee Lane, Stockton, CA In ' August 1999, URS Greiner Woodward Clyde (URSGWC) conducted a soil bonng/ground water investigation Five bonngs were drilled using direct push (DP) and hollow stem auger The highest TPH as diesel concentrations (at 22,000 mg/kg) in soil were detected in samples collected from boring B-1 at ' the 10-foot depth interval However, TPH as diesel was detected in soil samples collected from the entire soil boring to ground water Concentrations ranged from 6,000 mg/kg (at 15-feet bsg) to 2,000 mg/kg (at 40-feet bsg) Ethylbenzene and total xylenes were also detected ranging to 0 011 mg/kg and 0 061 mg/kg, ' respectively at 10 feet bsg In their November 4, 1999 letter, the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) requested a further investigation to determine the lateral and vertical extent of the petroleum contamination at the subject property On June 15, 2000, Ms Lon Duncan, Senior REHS with the PHS/EHD, approved the work plan prepared by HETI HETI then installed six DP bonngs ' throughout the subject property Grab ground water samples were obtained from each boring No detectable concentrations of TPH as gasoline, TPH as diesel, benzene, toluene, ethylbenzene and total xylenes (BTEX), or the five fuel oxygenates were found in the 46 soil samples and six grab ground water samples submitted for analysis HETI then installed three ground water monitoring wells to sample ground water and to determine ground water flow direction and gradient TPH as diesel was detected at 100 parts per billion (ppb) in MW-1 and MW-3 and at 87 ppb in MW-2 No detectable concentrations of TPH as gasoline, BTEX, or the five fuel oxygenates, 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB) were found in the ground water ' samples submitted for analysis HETI recommends semi-annual ground water monitoring for one year 1 1 i i