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�} 1 INTRODUCTION 1 PSC Environmental Services (PSC) subcontracted ETIC Engineering (ETIC) to perform the quarterly groundwater-monitoring activities at the Earthgrains Baking Companies, Inc (Earthgrains) facility The fourth quarterly event was performed on November 10, 2005 This report summarizes the results of those activities This report also includes current and historical summary tables (1 through 6) and figures (1 ' through 6) This quarterly report is being submitted to the San Joaquin County Environmental Health Department (SJCEHD) Copies of the report have been submitted to the Central Valley Region of the California Regional Water Quality ' Control Board (CVRWQCB), and to the Underground Storage Tank (UST) Clean-Up Fund of the State Water Resources Control Board (SWRCB) ' 1.1 Site Description The project site is located at 2651 South Airport Way in Stockton, California (Figure 1) The plant straddles Sections 22 and 23 of Township 1 North, Range 6 East of the Mount Diablo Base and Meridian The Earthgrains ' facility is a bakery products plant formerly known as the Rainbo Baking Company The developed portion of the site consists of approximately seven acres, which is relatively flat, and is primarily covered with asphalt and concrete The main facility building covers approximately two acres Several shallow (less than three-foot deep) water lines, electrical lines, and storm-water sewer lines transect the property ' A storm-water drainage ditch (approximately 1,000 feet long and less than five feet deep) extends westerly from the southwestern side of the facility towards a south-flowing drainage canal This canal empties into the ' ephemeral Duck Creek, which is located about 900 feet south of the plant Duck Creek is typically dry except during periods of higher precipitation 1.2 Chronology of UST-Related Events ' The facility once operated four petroleum-hydrocarbon UST systems, which consisted of a 10,000-gallon diesel tank and two 6,000-gallon gasoline tanks located near the southwestern corner of the main plant building (shown in ' Figure 2) A 20,000-gallon diesel tank was located on the eastern side of the facility (not shown) The two gasoline UST systems near the southwestern building corner were removed in April 1987 The eastern-most gasoline UST system had Quarterly Groundwater Morutonng Report � 4th Quarter-November 2005 Prepared for SARA LEE BAKERY GROUP,INC Prepared by PSC Environmental Services Investigative and Quarterly Report 14th Quarterly Report 112005 doe February 24,2006