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i <br /> 1. INTRODUCTION <br /> Haley & Aldrich, Inc has prepared this Second Quarter 2004 Groundwater Monitoring <br /> 1 Report for the Penny Newman Grain Elevator facility on behalf of Huff& Huff, Inc and its <br /> client, ContiGroup Companies, Inc (CGCI) The Penny Newman Grain Elevator is located <br /> at 1805 Harbor Street in Stockton, California This report describes the results of field <br /> work conducted on 3 June 2004 in which groundwater was sampled from 7 monitoring wells <br /> at the site and analyzed for total petroleum hydrocarbons as diesel (TPHd) and gas (TPHg) <br /> and benzene, toluene, ethylbenzene and xylene (BTEX) This report summarizes the results <br /> from the second quarter 2004 groundwater monitoring <br /> We interpret the groundwater flow direction to be toward the south The groundwater <br /> rP <br /> gradient was calculated to be approximately 0 0009 ft/ft in June 2004 (Figure 1) <br /> Historically groundwater has been interpreted to flow to the south with some variation <br /> toward the southeast and southwest, with an average hydraulic gradient ranging from 0 0002 <br /> to 0 001 feet per foot (ft/ft) (ATC, 2002) <br /> This quarter, TPH as diesel was detected in all seven of the monitoring wells <br /> Concentrations of TPH as gasoline were detected in two of the seven groundwater wells <br /> Concentrations of toluene were detected in three of the seven groundwater wells Table 2 <br /> shows all analytes detected this quarter and Table 5 show cumulative results for TPHd, <br /> TPHg and BTEX <br /> 1.1 Overview of Environmental Issues -Background <br /> 1.1.1 Site Description <br /> The site is located at 1805 Harbor Street in Stockton, California The site is bounded to the <br /> north by the Deep Water Channel of the Port of Stockton and bounded to the south by <br /> railroad tracks Railroad tracks also run through the center of the facility The site is <br /> located in an industrial and residential area and is currently occupied by Penny Newman <br /> Grain Company, a division of Burlington Northern Santa Fe <br /> 1.1.2 History <br /> rIn January 1988, a 12,000-gallon underground storage tank (UST) was removed from an <br /> area in the southern portion of the site Results of the analytical testing indicated the <br /> samples collected beneath the former UST contained detectable concentrations of petroleum <br /> hydrocarbon constituents The excavation was subsequently backfilled <br /> In October 1997, ATC Associates Inc (ATC) advanced soil borings SB-1 through SB-6 in <br /> the vicinity of the former UST to depths ranging up to approximately 26 feet (ft) below <br /> ground surface (bgs) Soil samples were collected from borings SB-1 and SB-2 and <br /> groundwater grab samples were collected from all the borings The soil samples from SB-1 <br /> and SB-2 contained detectable concentrations of TPHd and lower levels of TPHg The <br /> groundwater samples from borings SB-1 through SB-4 also contained detectable <br /> concentrations of TPHd and TPHg, whereas SB-5 and S13-6 did not contain detectable <br /> concentrations of TPHd or TPHg <br /> HALEYBz <br /> ' ALDRICH 1 <br />