ARCHIVED REPORTS XR0005970 - Laserfiche WebLink

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. 1.0 INTRODUCTION Upgradient Environmental Consultants (Upgradient) is under.contract to Peters Check Cashing' to perform quarterly monitoring of groundwater contamination at the Kwikee Foods Mart on Country Club Avenue in Stockton, California. The purpose of this report is to present the results of groundwater monitoring during the third quarter of 1995. 2.0 BACKGROUND INFORMATION 2.11 Site Location and Description The project site is located at 2081 Country Club Avenue in west-central Stockton. The location of the site is shown in Figure 1, and the site facilities are shown in Figure 2. The site is located in a residential/commercial area, and the local topography is flat. A Chevron gasoline station was formerly located across Franklin Street from the site, but has been demolished and is presently undergoing monitoring of soil and groundwater contamination resulting from activities at that site. Groundwater monitoring data at that site indicate that groundwater flow is to the northeast, toward the Kwikee Foods site, and monitoring wells have been drilled in Franklin Street near the Kwikee Foods property line(Figure 2). 2.2 Frevious Work A groundwater monitoring well was installed near the dispenser island in 1990. This well was originally labelled MW-1, but has been renamed KF-3 in this investigation. It is our understanding that Geological Technics performed routine groundwater monitoring of this well in April 1990. Total petroleum hydrocarbons in the gasoline range (TPH-g) were detected at a concentration of 81,000 mg/l (ppb), and benzene was detected at a concentration of 2,107 ppb. Toulene, ethylbenzene, and xylene were also detected at elevated levels. Subsequently, EHD requested further assessment of the extent of the plume of contaminated groundwater, but no work was performed until monitoring wells KF-1 and KF-2 were installed by Soils Exploration Service under the supervision of Upgradient in December 1994. Neither well encountered significant'soil contamination, but gasoline and aromatic hydrocarbons were detected above reporting limits in groundwater samples from both wells. Gasoline was also detected in KF-3. Groundwater elevation data indicated that groundwater flow was to the east. Upgradient recommended that monitoring continue on a quarterly basis. Groundwater monitoring took place in March and was reported in April 1995. Contaminant concentrations were higher in all wells than they had been in December. For financial reasons, groundwater was not monitored in the second quarter of 1995. The depth to groundwater was measured during August, but no samples were collected and no report was prepared. • 2