ARCHIVED REPORTS XR0005954 - Laserfiche WebLink

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I.0 INTRODUCTION Kwikee Foods is a convenience store and former gasoline filling station located on Country Club Boulevard in Stockton, California. The project site is located at 2081 Country Club Boulevard in west-central Stockton. 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 (LOP) 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 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 Iocated 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 recently completed 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 down 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. 3.0 MONI'T'ORING PROCEDURES Groundwater monitoring took place on November 20, 2001. GettIer-Ryan Inc. monitored the neighboring Chevron site bn the same date and provided water-depth measurements to Upgradient Environmental, and Morrow Surveying re-surveyed both the Chevron and Kwikee Foods wells on the same date. The Chevron data have been incorporated into this report. r � After the wells were opened and allowed to equalize with. atmosphefic pressure, the depth to groundwater was measured with a water level meter and recorded on the Well Monitor Report (Appendix A). A battery-operated purge pump was then used to purge the wells of standing water. Ten to 15 gallons of water were purged from each well and stored in 55-gallon drums on site. 3