Laserfiche WebLink
IT Corporation <br /> February 25, 2000 t,4fember o!'T1re IT Grnup <br /> Page 4 <br /> DWR Well Search <br /> Well logs submitted to the DWR were reviewed to locate any wells that could be potentially <br /> impacted by groundwater conditions at the subject site. The DWR file review indicated the <br /> presence of one well within 2,000-feet of the subject site. This well is located north and cross <br /> gradient at 1521 N. Hunter Street. The construction or current use of this well was not included <br /> on the well log obtained from the DWR. SJCPHD/EHD tried to visually locate this well and was <br /> unsuccessful. Well details are presented Table 2, approximate locations are shown on Figure 5 <br /> and copies of the well logs are included in Attachment G. <br /> CONCLUSIONS <br /> Site assessment activities identified the following subsurface conditions: <br /> 0 Site soils consist of interbedded sands, silty sands, and sandy silts to the total depth <br /> explored. <br /> • Depth to groundwater is approximately 28 feet bgs and the gradient is to the east at a <br /> magnitude of approximately 0.003 feet/feet. <br /> • The lateral extent of petroleum hydrocarbon impact to soil is generally defined by soil <br /> data collected during this investigation. <br /> • The extent of groundwater impacts has been defined. Benzene was detected in one well <br /> . below the MCL of 1.0 ppb. MtBE was reported in two wells at or below the secondary <br /> MCL of 5.0 ppb. MtBE is the only oxygenate present. <br /> RECOMMENDATIONS <br /> On behalf of Tosco, IT recommends conducting three additional monitoring events to assess <br /> hydraulic gradient and water quality. <br /> • <br /> 11SACPFP 11COM MONlrancfp 11Projects\P roj ects191 1101 111 A10 1021Report.doc <br />