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1 0 INTRODUCTION <br /> On behalf of Rinehart Distributing, Inc , Ramage Environmental has prepared this Groundwater <br /> Monitonng Report, Third Quarter 2005 for submittal to the San Joaquin County Environmental <br /> Health Division (EHD) and Central Valley Regional Water Quality Control Board (RWQCB) The <br /> scope of work was completed according to Ramage Environmental's Work Plan, Additional Site <br /> Investigation dated October 22, 2004 EHD approved the work plan addendum on November 9, <br /> 2004 <br /> ' 1 1 Site Location and Description <br /> ' The site is an active Valero gasoline service station and convenience store located at 1001 E <br /> Yosemite Avenue in the city of Manteca (San Joaquin County), California (Figure 1) The property <br /> was formerly a RINO service station, which included three 10,000-gallon gasoline underground <br /> storage tanks (UST) in a common excavation on the east side of the site and two dispenser <br /> islands in the south-central part of the site (Figure 2) In 1999, new USTs were installed in the old <br /> ' UST excavation and new dispensers were constructed in approximately the same location as the <br /> old dispensers During the second quarter of 2004, an on-site water well was taken out of service, <br /> and the site was connected to city water service <br /> 1 2 Previous Work <br /> ' 1 2 1 UST System Removal and Soil Sampling <br /> During January 1999, Herbst Engineering, Inc removed the three former USTs, two dispenser <br /> islands, and the old canopy structure and supports On January 28, 1999, under EHD <br /> observation, Ramage Environmental collected six sod samples from beneath the former USTs <br /> and six soil samples from beneath the former dispensers and canopy supports <br /> ' On February 23, 1999, Ramage Environmental transmitted to EHD the results of the soil and soil <br /> stockpile sampling and analysis Results indicated that the soil beneath the former USTs had not <br /> been impacted by gasoline compounds The sample collected from beneath the southwestern <br /> ' dispenser did contain 0 017 milligrams per kilogram (mg/kg) of methyl tertiary butyl ether (MTBE), <br /> and the sample collected at a depth of 8 feet beneath the western canopy support contained 350 <br /> ' mg/kg of Total Petroleum Hydrocarbons (TPH)-as-gasoline and 1 2 mg/kg of xylenes <br /> ' 4 <br />