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1 <br /> ' 1.0 INTRODUCTION <br /> ' This report presents the results of a subsurface soil investigation performed by FREY Environmental, <br /> Inc. (FREY) at the Ryder, Inc. (Ryder) facility located at 3633 Duck Creek Drive in Stockton, <br /> California [(Site)(Figure 1)]. <br /> ' The work was performed in general accordance with a workplan prepared by FREY dated April 5, <br /> 2004 (FREY, 2004a). The April 5, 2004 workplan was approved by the San Joaquin County <br /> ' Environmental Health Department (EHD) in a phone conversation with FREY on May 5, 2004 <br /> (EHD, 2004). <br /> 1 2.0 BACKGROUND <br /> 2.1 Soil Sampling Beneath Product Piping and Fuel Dispensers <br /> Bonsall Petroleum conducted product piping and fuel dispenser upgrade activities at the Site in <br /> September of 2003. On September 18,2003,FREY collected one soil sample from beneath each of <br /> ' nine fuel dispensers (labeled D1 through D9). Five soil samples were collected from beneath the <br /> product piping (labeled P1 through P5). One soil sample was collected from beneath a fresh oil <br /> dispenser(labeled 01) (FREY, 2004b). Soil sample locations are shown on Figure 2. <br /> ' In general,soil samples collected frombeneath the fuel dispensers and product piping were analyzed <br /> for total petroleum hydrocarbons modified for diesel (TPH-d), total petroleum hydrocarbons <br /> modified for gasoline (TPH-g), benzene, toluene, ethylbenzene, total xylenes (BTEX) and fuel <br /> oxygenates (FREY, 2004b). <br /> ' TPH-d was detected in soil samples D2 (220 milligrams per kilogram(mg/kg)),D5 (2,200 mg/kg), <br /> D8 (1,300 mg/kg)and D9(2,300 mg/kg). TPH-gwas detected in soil sample D5 at a concentration <br /> ' of 28 mg/kg. TPH-g was not detected in any of the other soil samples analyzed for TPH-g.With the <br /> exception of low concentrations of total xylenes;.concentrations of BTEX and fuel oxygenates were <br /> not detected in the soil samples collected on September 18, 2003 (FREY, 2004b). Soil sample <br /> ' results have been summarized in Table 1. <br /> 2.2 Soil Sampling Beneath Fresh Oil Piping <br /> 1 FREY returned to the Site on November 3, 2003 and collected four soil samples from beneath a <br /> former fresh oil pipe line. Soil samples were labeled P6 through P9 and are shown on Figure 2. <br /> ' Concentrations of TPH-d, BTEX and MTBE were not detected in soil samples P6 through P9 <br /> (FREY,2004b). Soil sample results have been summarized in Table 1. <br /> ' FREY <br /> 1 <br />