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ti.,/ <br /> CHRONOLOGY <br /> 51 EAST BEVERLY, TRACY <br /> LOP:2227 <br /> APN: 233-330-33 <br /> 09/05/85 One 550 gal.UST(gasoline)was removed under PHS/EHD permit and inspection. <br /> Gasoline odors were observed at time of removal and further investigation was required. <br /> No soil or groundwater samples were collected at the time of removal.. <br /> 09/17/85 Tracy Unified contracted Kleinfelder and Associates to completed one soil boring in the <br /> area of the former UST. Three soil samples and one grab ground water sample were <br /> collected and analyzed. Soil samples were collected at 3 ft., 8 ft.,and 11 ft. bgs. One <br /> ground water sample was collected at 13 ft.bgs. Low concentrations of gasoline and <br /> BTX were evidenced in samples collected and the excavation was backfilled. <br /> 06/14/96 After file review,PHS/EHD completed and filed a UAR for the release that was <br /> documented in 1985. Tracy Unified was directed to completed additional soil and ground <br /> water sampling to define the full extent of the contamination caused by the unauthorized <br /> release. <br /> 07/10/00 After approval of a work plan by PHS/EHD to perform geo-probe sampling, soil and <br /> ground water samples were collected from two locations in the area of the former UST. <br /> All samples were below detection limits;the contamination that was documented in 1985 <br /> was not confirmed. See table below: <br /> Maximum Documented Contaminant Concentrations - - Before and After <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil ()pm) Water <br /> Before After Before After Before After Before <br /> TPH (Gas) 3 <1 0.25 <0.05 Xylene <1 <0.005 0.45 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene UNK <0.005 UNK <br /> Benzene <1 <0.005 0.007 <0.0005 Oil &Grease NA NA NA <br /> Toluene <1 <0.005 0.09 <0.0005 Heavy Metals PB 13 PB 13 NA <br /> MTBE UNK UNK UNK <br /> 08/17/00 An abandoned on site irrigation well was destroyed under PHS/EHD permit and <br /> inspection. <br /> 08/21/00 PHS/EHD received a Final Report prepared by The San Joaquin Company Inc. which <br /> included soil and ground water analytical results,a well receptor survey,and a <br /> recommendation of no further action and site closure. <br /> 09/29/00 PHS/EHD prepared the site file for CVRWQCB closure concurrence. <br /> chrontusdbeverly <br />