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Phase II Environmental Site Assessment 1645 Cherokee Lane,Stockton,CA ' Hydro-Environmental Technologies,Inc ' 1.0 SITE LOCATION AND BACKGROUND ' The subject property is at 1645 Cherokee Lane, Stockton, California, north of the intersection of Cherokee Lane and Waterloo Road It is in T2N, R6W of the 1968 (revised 1987) Stockton West, California 7 5 minute (124,000) Quadrangle The property is approximately 21 feet above mean sea ' level (AMSL) 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, URSGWC conducted a soil bonng/ground water investigation Five borings 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 TPH as diesel was also detected in soil samples collected from boring B-2 (38 mg/kg at 12 feet bsg), boring B-4 (27 mg/kg at 10 feet bsg) and boring B-5 (19 mg/kg at 10 feet bsg, 1 1 mg/kg at 20 feet bsg, ' 1,800 mg/kg at 25 feet bsg and 3,200 bsg at 31 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 Lori Duncan, Senior REHS with the PHSIEHD, approved the work plan prepared by HETI (See Appendix A) HETI then installed six DP borings throughout the subject property Grab ground water samples were obtained from each boring HETI then installed three ground water monitoring wells to determine ground water flow direction and gradient ' Figure 1 is a site location map, Figure 2 is the DP soil boring and ground water monitoring well locations map 1 1