ARCHIVED REPORTS_XR0011455 - Laserfiche WebLink

Home Browse Search

Sunland Gasoline March 10,2004 2085 Fremont Street,Stockton, California Page 3 ' Work Plan for the,Lateral and Vertical Extent Of Soil and Groundwater Contamination- Continued 3.4 Scope of Work ' This scope of work was developed to characterize the lateral and vertical extent of the soil and groundwater contamination associated with the unauthorized release that ' occurred as a result of fueling operations located on the subject property. The work plan provides for the following activities to be completed at 2085 Fremont ' Street, Stockton, California: ■ Lateral and Vertical Definition of Soil Contamination: five (5) vertical soil borings to be completed to a depth of 10' beyond the point at which a properly calibrated field PID does not detect the presence of petroleum hydrocarbons. WHF believes this ' depth will range between 75.0' to 85.0'in the borings defining lateral extent and as deep as 125' below ground level in the deepest boring to define the vertical extent. This is based upon the data gathered during the previous scope of work. ' One (1) boring will be a deep boring and placed in the vicinity of MW-1 (completed in July 2004). Figure 3 illustrates the placement of proposed soil and groundwater monitoring wells. Since MW-I was terminated at 70.0' and soil samples were collected a 5' intervals, WHF proposes that soil sampling begin at 75.0' below ground level. A groundwater sample will be collected once groundwater has been encountered. One (1) soil boring will also be completed to the north of the farmer tank location in the field and converted to a monitoring well. This will provide relevant lithological and hydrological data about the underlying materials. Three (3) soil borings will be completed both on and off site to establish the outer boundaries of both soils and groundwater contamination (Figure 3) in an attempt to define the lateral extent of soil contamination. These borings will be completed at a ' point 10' beyond the depth at which the field PID indicates that petroleum hydrocarbons are not detectable. These three (3) soil borings will be completed using a mobile mounted drilling rig employing the use of a hollow stem flight auger. Soil ' samples will be collected a 5' intervals and will be screened with a PID. A single groundwater sample will be collected from each boring. ' groundwater Monitoring Well Installation: Completion of four (4) soil borings to a depth of approximately 85.0' below ground level. The groundwater table is approximately 58' below the surface. The placements of these wells are depicted in ' Figure 3. Soil samples from each boring,will be collected at 5' intervals and a single groundwater sample will be collected once groundwater is encountered. Each sample will be screen with a PID for the presence of petroleum hydrocarbon contamination. 1