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it 1.0 INTRODUCTION Kwikee Foods is a convenience store and former gasoline filling station located on Country Club 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 Department of Health Services, Environmental Health Division(PHS/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 PHS/EHD and has been supervised since that time by Michael Infuma, 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). i 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 PHS/EHD, which listed several reasons for directing Mr. Peters to continue groundwater monitoring for. at Ieast two additional quarters. 3.0 MONITORING PROCEDURES Groundwater monitoring took place on May 24, 2002, Gettler-Ryan Inc. monitored the neighboring Chevron site on the same date and provided water-depth measurements and laboratory data. After the wells were opened and allowed to equalize with atmospheric pressure, the depth to groundwater was measured with a water level meter and recorded on the Well Monitor Report (Appendix A). The depth to the static water level was anomalously high in KF-5, relative to the other wells. Therefore, the initial depth reading was not recorded and it was assumed that the water 3