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1. INTRODUCTION Haley & Aldrich, Inc (Haley & Aldrich) has prepared this site investigation report for the • Penny Newman Gram Elevator, Former ContiGroup Gram Elevator, on behalf of Huff& 1 Huff, Inc and its client, ContiGroup Companies, Inc (CGCI) A site location map is presented in Figure 1 The Penny Newman Grain Elevator is located at 1805 Harbor Street in Stockton, California This site investigation was conducted in accordance with the "Site Investigation Work Plan" dated 9 December 2002, the "Work Plan Addendum" dated 17 April 2003, and the "Memorandum" dated 17 March 2004, which were prepared by Haley & Aldrich and approved by the San Joaquin County Environmental Health Department (SJCEHD) The SJCEHD provided additional guidance in a directive letter distributed by email on April 1, 2004 Finally, the SJCEHD was on site during the field work to direct the placement of boring locations, as well as the selection of sample depths Based on SJCEHD ' requests, significant in-field changes were made to the boring locations and the sample collection The completed site investigation consisted of advancing ten soil borings, installing a single groundwater monitoring well, and sampling and analyzing soil and groundwater 1.1 Objectives The purpose of this investigation was to delineate the vertical and horizontal extent of petroleum hydrocarbon impact to soil and groundwater in the vicinity of the former tank excavation area In addition, the condition of the backfill material used to fill the former tank excavation area was evaluated This report summarizes the work conducted i 1.2 Background 1.2.1 Site Description i The site is located at 1805 Harbor Street in Stockton, California The site is bounded to the north by the Deep Water Channel of the Port of Stockton and bounded to the south by railroad tracks Railroad tracks also run through the center of the facility The site is located in an industrial and residential area and is currently occupied by Penny Newman Grain Company, a division of Burlington Northern Santa Fe 1.2.2 History In January 1988, a 12,000-gallon diesel underground storage tank (UST), which reportedly contained gasoline, was removed from an area in the southern portion of the site Results of the analytical testing indicated the samples collected beneath the former 10,000-gallon UST contained detectable concentrations of petroleum hydrocarbon constituents The excavation was subsequently backfilled ' In October 1997, ATC Associates Inc (ATC) advanced soil borings SB-I through SB-6 in the vicinity of the former UST to a depth of approximately 26 feet (ft) below ground surface (bgs) (Figure 2) Soil samples were collected from borings SBA and SB-2 and groundwater grab samples were collected from all the borings The soil samples from SBA and SB-2 contained detectable concentrations of total petroleum ' hydrocarbons (TPH) as diesel (TPHd) and lower levels of TPH as gasoline (TPHg) Soil and groundwater analytical results from previous investigations and from the 2002 second quarterly groundwater monitoring report are presented in Tables 1 and 2, 1