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I INTRODUCTION Philip Services Corporation (PSC) has been performing remedial action by addressing a subsurface release of gasoline from a leaking underground storage tank (UST) at The Earthgrains Company (Earthgrains) facility at 2651 South Airport Way in Stockton, California This remedial action has comprised air sparging and soil vapor extraction of petroleum hydrocarbons in the vicinity of the release since April 25, 2001 Remedial action was performed in general accordance with PSC's Remedial Action Work Plan, dated August 31, 2000, which was approved by the San Joaquin County Environmental Health Department (EHD) on September 8, 2000 At the suggestion of EHD staff, PSC has prepared a Site Conceptual Model (SCM) for this facility, which is a characterization of the release, subsurface conditions, and associated risks to potential receptors This Remedial Action Completion Report (RACR) presents information in general accordance with the SCM Reports final draft document dated March 27, 2000 Contained within this RACR is a description of the site, a chronology of UST associated events, and a property usage and a water well survey This RACR also includes physical and chemical characteristics of the subsurface, a summary of remedial activities, the SCM, and risk based corrective action modeling to assess whether hazards exist to potential receptors While some residual petroleum hydrocarbon impact may still be present, the operated remediation system, in conjunction with natural biodegradation, has been quite effective in reducing petroleum hydrocarbon levels in the subsurface Based on the information within this RACR, PSC requests that the EHD review current conditions and consider granting case closure for this leaking UST site 1 1 Site Description The facility is a bakery products plant located at 2651 South Airport Way in Stockton, California (see Figure 1) The plant straddles Sections 22 and 23, Township 1 North, Range 6 East of the Mount Diablo Base and Meridian The site has a general elevation of 17 feet relative to mean sea level The developed portion of the facility consists of approximately seven acres, ' which is relatively flat lying, and is almost entirely covered with asphalt and concrete The main facility building covers about two acres An approximately 1,000-foot-long, shallow, stormwater drainage ditch extends westerly along the south side of the facility towards a south-flowing drainage canal This ditch empties into the intermittent Duck Creek, which is located about 900 feet south of the plant Duck Creek is typically dry except during periods of higher precipitation Several shallow (less than 3 feet deep) water, electrical or stormwater sewer lines transect the property 4 Remedial Action ComplLtlon Report The Earth-rains Company Facility 2651 South Airport Way Stockton Cahlornia Prepared for Ti-it EAR I IICRAINS C OMPANY Prepared by Philip ServieL,Corp H\LNV\62400132512i�3!1 April 14 2003