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1.0 INTRODUCTION <br /> On behalf of Rinehart Distributing, Inc , Ramage Environmental has prepared this Groundwater <br /> Monitonng Report, Fourth Quarter 2003 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 September 26, 2001, and work plan addendum dated January 21, 2002 EHD <br /> approved the work plan addendum on January 30, 2002 <br /> 1.1 Site Location and Description <br /> The site is an active Beacon 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 j <br /> storage tanks (UST) in a common excavation on the east side of the site and two dispenser <br /> islands in the south-central pant 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 All water for the service station and convenience store is derived from a domestic <br /> water well located in the southern part of the site (Figure 2) <br /> 12 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 soil samples from beneath the former USTs <br /> and six sod samples from beneath the former dispensers and canopy supports <br /> On February 23, 1999, Ramage Environmental transmitted to EHD the results of the sod 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 12 mg/kg of xylenes <br /> 3 <br />