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i 1.0 INTRODUC'T'ION • Kwikee Foods is a convenience store and former gasoline fillip station located on Count Club g g �' Boulevard in Stockton, California. The location of the site is shown in Figure 1, and the site facilities are shown in Figure 2. The property is owned by Mr. William Peters, and has been leased out for several years. Investigation of subsurface petroleum contamination has been conducted by Upgradient Environmental Consultants and supervised by the Local Oversight Program of San Joaquin County Environmental Health Department(EHD). 2.0 BACKGROUND INFORMATION The site is located in a residential/commercial area, and the local topography is flat. Following the discovery of gasoline in groundwater beneath the site in 1990, the site was placed in the LOP program of EHD and has been supervised since that time by Michael Infurna, REHS. Upgradient Environmental Consultants began to assess the extent of soil and groundwater contamination in 1994, and completed the assessment in the fourth quarter of 2000. The results were presented in a Problem Assessment Report(July 1, 2001). A Chevron.gasoline station was formerly located across Franklin Street from the site. Assessment of that site was begun in the early 1990's, and remediation began in the latter part of 2000. In the Problem Assessment Report for Kwikee Foods, we used laboratory data from the Chevron site to conclude that dissolved-phase hydrocarbons have migrated eastward from the Chevron site in the • direction of the prevailing hydraulic gradient, resulting in groundwater contamination beneath Kwikee Foods. The report recommended that monitoring of the Kwikee Foods site continue through the end of 2001 to confirm that groundwater quality is improving and that the trend of declining contaminant concentrations does not reverse. In December 2001, Upgradient Environmental submitted a Site Closure Report on behalf of Mr. Peters. The recommendation for site closure was not approved by EHD, which listed several reasons for directing Mr_ Peters to continue groundwater monitoring for at least two additional quarters. Monitoring was performed in February and May 2002, and Upgradient Environmental again concluded that Kwikee Foods was not responsible for the groundwater contamination at the site. In September, Upgradient therefore again requested site closure and submitted a work plan to destroy the monitoring wells. The plan was not approved by EHD, and the RP was directed to continue monitoring. EHD also requested either a work plan for further investigation or a more j comprehensive report presenting an in-depth conceptual model of the.site. The RP complied with this request, and Upgradient Environmental submitted the Site Conceptual Model and 4`� Quarter 2002 Report in December 2002. EHD provided a brief response on February 27, 2003, directing the RP to continue monitoring until further notice, but permitting the RP to suspend sampling of three of the wells. 3