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SECTION I ' INTRODUCTION On behalf of the General Services Administration (GSA), Cape Environmental Management ' Inc (CAPE) has performed a soil and groundwater investigation at the Stockton Federal Building, located at 401 North San Joaquin in Stockton, California Figure 1 is a Site Vicinity ' Map depicting relative location of the project site The purpose of the investigation is to assess the extent of observed soil impacts and possible groundwater impacts due to an underground storage tank release The investigation has been performed in accordance with a Soil and Groundwater Investigation Work Plan, dated October 1995, and as specified by the San Joaquin County Public Health Services, Environmental Health Division (EHD) 1.1 BACKGROUND This current soil and groundwater investigation is a continuation of site investigation work ' carried out by CAPE and others in 1994 and 1995 It is CAPE's understanding that the EHD is in receipt of and has reviewed previous environmental reports pertaining to assessment activities at the site CAPE prepared a report titled Subsurface Investigation Report, Federal Building, 401 San Joaquin Street, Stockton, California, dated August 1994, which described soil conditions prior to the removal of two (2) 5,000 gallon underground storage tanks (USTs) Elevated concentrations of total extractable petroleum hydrocarbons were reported from soil samples collected during this investigation ' On or about May 10, 1995 the two (2) 5,000 gallon USTs, previously used for storage of diesel fuel for the emergency generator system, were removed by Clemens Construction Sierra Environmental Sampling collected soil samples from the excavation A discussion of ' the analytical results for these soil samples is presented in a letter report prepared by CAPE, dated July 14, 1995, and submitted to the EHD An addenda to the letter report prepared by CAPE, dated August 16, 1995, was also submitted to the EHD Samples collected from soil ' located beneath the former UST locations were reported to contain elevated levels of total petroleum hydrocarbons (TPH) as diesel, TPH as gasoline, TPH as oil, ethylbenzene, and total xylenes Results of laboratory analysis for polychlorinated biphenols (PCBs) and volatile organic compounds were below method detection limits Additional excavation of impacted soil took place The excavation was extended south to Lindsay Street, west to the transformer vault, east to the wheelchair access ramp, and north to the retaining wall Soil samples were collected from the limits of the excavation and it was ' discovered that impacted soil extended both horizontally and vertically outside the excavated area, beyond that which could be reached with available excavation equipment ' 1