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Three monitoring wells were installed on the property in 1990, and monitored through October <br /> 1996 The groundwater gradient was generally directed to the north No petroleum hydrocarbon <br /> tconstituents were detected in any of the monitoring events, however, elevated concentrations of <br /> halogenated hydrocarbons had been detected (Del-Tech, 1996) The SJCEHD issued a no further <br /> action letter in November 1997 <br /> Carl Novarro <br /> The property, located at 124 East I I" Street (approximately 650 feet to the southeast of the SBC <br /> site), is not listed as a LUST site in the EDR report, but is included in the FID database as having <br /> tan inactive UST (Photograph 13) According to SJCEHD records, the property contained a 200- <br /> gallon gasoline tank that was removed in 1986 No additional records were located <br /> Summary <br /> Groundwater gradient at several sites in the area has been reported as to the north Based on the <br /> relative proximity of the numerous UST systems to the subject site and the reported direction of <br /> groundwater flow, it is possible some of these properties have had an impact on environmental <br /> conditions of the SBC site Additional environmental records listed under federal and state <br /> ASTM standards for the site and neighboring properties are included in the EDR report <br /> (Appendix G) Figure 7 depicts surrounding site properties <br /> 2.0 Pathways <br /> Migration s <br /> g Y <br /> 1 2.1 Groundwater Migration <br /> Groundwater at the site has been encountered at depths ranging from 11 feet to 14 feet bsg, with <br /> native site soils consisting of silty clay from the ground surface to a maximum explored depth of <br /> approximately 16 feet bsg The groundwater gradient direction at the site is unknown, however, <br />' the gradients observed at nearby properties have generally been directed to the north or northeast <br /> TPH-D has been detected in groundwater samples collected from UST removal and a subsequent <br /> soil boring investigation at concentrations up to 390 ppb No BTEX constituents or MTBE were <br /> encountered in any of the groundwater samples collected from the site <br /> CNCD104-28-031SHARE\USTW3-0027 doc 10 <br />