ARCHIVED REPORTS_XR0006043 - Laserfiche WebLink

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l • 1.0 INTRODUCTION Upgradient Environmental Consultants has been investigating soil and groundwater contamination at 3931 Newton Road in Stockton since September 1994 After three phases of drilling, Upgradient Environmental deemed the assessment complete and submitted a Problem Assessment Report for the site in October 1996 Mr Steve Sasson of the San Joaquin County Public Health Service, Environmental Health Division (PHS/EHD) concurred with this conclusion and recommended that Gilkes Trucking submit a Corrective Action Plan for remediation of diesel fuel in the soil and groundwater, but the concerned parties could not agree on a remedial plan and no Corrective Action Plan was prepared Since then, activity has been limited to groundwater monitoring and responsibility for regulatory oversight of the investigation has passed to three different employees of PHS/EHD, resulting in confusing and sometimes conflicting or controversial regulatory guidance As a result, monitoring tics been sporadic of late, and only one groundwater monitoring report was submitted in 2001 Monitoring was again performed in the first quarter of 2002, but no samples were collected Therefore, this report has two purposes The first is to present the results of groundwater monitoring activities during the second quarter of 2002 The second is to summarize what is known about the extent and magnitude of the contarrupation and identify historical trends in concentrations 2.0 BACKGROUND • The project site is located at 3931 Newton Road, in an industrial area on the northeast outskirts of Stockton near U S Highway 99 The location of the site is shown in Figure 1, and the site facilities are shown in Figure 2 Originally agricultural property, the site was developed as a commercial truck terminal in 1973 The property occupies an area of about 3 5 acres Topography in the area is generally flat, although the project site is elevated several feet above the adjacent parcels There is a maintenance building and office fronting Newton Road, with a large, unpaved storage yard/parking lot in the rear A diesel and gasoline fueling facility, consisting of two underground storage tanks (UST's), was formerly present on the south side of the storage yard (Figure 2) This facility was removed in 1989 and replaced with an aboveground fueling facility, which is located to the west of the abandoned facility 3.0 PROCEDURES Groundwater monitoring took place on May 28 As reported in March 2002, the truck parking area has been resurfaced with new gravel road base, and only three monitoring wells remained visible A metal detector was therefore used, and three other wells were located (GT-1, GT-2, and GT-5) One well could not be found(GT-9), and is probably buried under a pile of broken concrete The wells were opened and allowed to equalize with atmospheric pressure before water depths were measured The depth to groundwater was measured with a water level meter and the measurements • 2