ARCHIVED REPORTS XR0005966 - Laserfiche WebLink

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1.0 INTRODUC'T'ION Upgradient Environmental Consultants (Upgradient) is illiam Peters to perform site assessment and quarterly monitoring f groundwater contamination er contract o at the Kwikee Foods Mart on Country Club Boulevard in Stockton, California. The site is included in the Local Oversight Program of San Joaquin County Department of Health Services, Environmental Healt-. Division (PHS/EHD), under the supervision of Michael lnfurna, RENS. in early April, 1998, Mr. Infurna approved an amended work plan to assess the extent of soil contamination at the site. This assessment was performed in May, 1998, and the purpose of this report is to present the. results of the assessment and related groundwater monitoring. 2.0 BACKGROUND INFORMATION 2.2 Site Location and Description 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 site is h-cated in a residential/commercial area, and the local topography is flat. A Chevron gasoline st ation 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. 2.2 Previous Work Three groundwater monitoring wells have been drilled at the site. Upgradient has sarn,)led these wells on several occasions since early 1995. In March, 1998, both 10,001?-gallon unlead.d storage tanks were removed, along with the related plumbing. Holes were found in both tanks, ar d soil and groundwater in the excavation were contaminated. Five Geoprobe borings were then drill.-d in May 1998 around the former UST cavity to delineate the extent of soil contamination. A woi k plan for off-site investigation of the extent of groundwater contamination has been submitted and approved, but the work has been postponed while Mr. Peters makes application for acceptance int(- the State UST Cleanup Fund Program. 3.0 GROUNDWATER MONITORING PROCEDURES Groundwater monitoring took place on January 28. Upon arrival at the site, Upgradient personnel opened the wells and allowed them to equalize with air pressure. Approximately 15 minutes after opening, the depth to groundwater was measured with a Solinst water level meter. The wE ter depths are shown in Table 1 and Appendix B. A two-stage submersible pump was then used to purge the wells of standing water, which was deposited in a 55-gallon drum. To prevent cross-contamination, the pump was washed in a TSP 2