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1 1.0 INTRODUCTION ' This workplan has been prepared in response to a letter authored by the San Joaquin County Environmental Health Department(SJCEHD)for the Ryder, Inc. (Ryder) facility LC 1071 located at 3633 Duck Creek Drive in Stockton, California(Site) (Figure 1). The letter was dated March 3, ' 2004 and requested the further investigation of diesel in soil beneath the Site. A copy of the letter from the SJCEHD has been attached in Appendix A. 2.0 BACKGROUND i2.1 Soil Sampling Beneath Product Piping and Fuel Dispensers Bonsall Petroleum conducted product piping and fuel dispenser upgrade activities at the Site in ' September of 2003. On September 18,2003,FREY Environmental,hic.(FREY)collected one soil sample from beneath each of nine fuel dispensers (labeled Dl through D9). Five soil samples were collected from beneath the product piping(labeled P 1 through P5). One soil sample was collected ' from beneath a fresh oil dispenser(labeled Ol) (FREY,2004). Soil sample locations are shown on Figure 2. ' In general,soil samples collected from beneath the fuel dispensers and product piping were analyzed for total petroleum hydrocarbons modified for diesel (TPH-d), total petroleum hydrocarbons modified for gasoline (TPH-g), benzene, toluene, ethylbenzene, total xylenes (BTEX) and fuel ' oxygenates(FREY, 2004). TPH-d was detected in soil samples D2 (220 milligrams per kilogram(mg/kg)),D5 (2,200 mg/kg), ' D8 (1,300 mg/kg)and D9(2,300 mg/kg). TPH-g was detected in soil sample D5 at a concentration of 28 mg/kg. TPH-g was not detected in any of the other soil samples analyzed for TPH-g.With the exception of low concentrations of total xylenes,concentrations of BTEX and fuel oxygenates were not detected in the soil samples collected on September 18,2003 (FREY,2004). Soil sample results have been summarized in Table 1. ' 2.2 Soil Sampling Beneath Fresh Oil Piping ' FREY returned to the Site on November 3, 2003 and collected four soil samples from beneath a former fresh oil pipe line. Soil samples were labeled P6 through P9 and are shown on Figure 2. Concentrations of TPH-d, BTEX and MTBE were not detected in soil samples P6 through P9 (FREY, 2004). Soil sample results have been summarized in Table 1.