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Groundwater Investigation Report <br /> Tank T-2 Area <br /> Former Laura Soudder's Tracy Plant <br /> Tracy, California <br /> 1.0 Introduction <br /> This groundwater investigation repo-'; has been prepared to <br /> summarize the field activities and .-he analytical data from a <br /> groundwater investigation conducted at the former Laura scudder's, <br /> inc. facility located at loo W. Valpico Road in Tracy, California <br /> (Figure 1) . <br /> The groundwater investigation was conducted in compliance with a <br /> request from the San Joaquin County Public Health Department, <br /> Environmental Health Division's (EHD) that the possibility of <br /> petroleum hydrocarbon compounds existing in the site's groundwater, <br /> beneath the location of a formerly removed underground storage <br /> tank, being investigated. <br /> was the last <br /> which the EHD <br /> requested prior rto closure investigation <br /> ns <br /> the underground storage tank sites <br /> r qu <br /> within the Tracy facility. <br /> 2.0 Previous Site Investigation Remedial Activities <br /> From the site, th,-ee underground fuel storage tanks were removed <br /> between 1987 and 1.989. These tan'cs, identified as T-1, T-2 and T <br /> 3, were located as shown on Figure 2. The following section <br /> provides a brief discussion of the tank removal, site investigation <br /> and remedial activities for the tank T-2 site. <br /> 2.1 Tank T-2 <br /> Tank T-2 was a 10,000 gallon diesel fuel storage tank that was <br /> removed in 1987. Initial tank bottom area soil samples indicated <br /> significant Total Petroleum Hydrocarbon 'TFH) concentrations, <br /> k.j Ensuing ex^.ovations were thought to have removed all of the TPH <br /> the request of the Local Health Depart- <br /> presence. However, upon <br /> ment, an additional investigation was conducted. <br /> i=a f-00 <br /> This additional investigation consisted of installing ad�rect�y !Q <br /> borehole utilizing a hollow stem auger drilling reg,8 This <br /> through the center ,of the former tank area (Fig <br /> ' as continued until <br /> borehole, installed in January 24, 1990, w <br /> groundwater was encountered. In order to ascertain the possible <br /> I compound presence within the soils underlying the tank area, soil <br /> ca samples were collected at 5' intervals during the borehole <br /> installation starting at a depth of 2o' beneath the ground surface. <br /> upon reaching the groundwater, a groundwater sample was collected <br /> from within the annulus of the petroleum hydrocarbons as diesel and <br /> i' benzene, toluene, xylene and ethyl benzene (BTX&E) . <br />