COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

PHASE II ENVIRONMENTAL SITE ASSESSMENT WORK PLAN City Lot "I" Parking Lot Stockton San Joaquin County, California March 30, 2007 INTRODUCTION This is a Work Plan to describe the Scope of Work for conducting a Limited Phase II Environmental Site Assessment (ESA) at the City Lot "I" Parking Lot (Site), the northeast corner of which is located at the intersection of Weber Avenue and Sutter Street in Stockton, San Joaquin County, California (Figure 1). The Site occupies Assessor Parcel Numbers (APN) 149-160-03, 149-160-04, 149-160-05, 149-160-06, and 149-160-07 (Figure 2). Condor Earth Technologies, Inc. (Condor) prepared this Work Plan at the request of Mr. Gabriel Karam, Director of Capital Projects, San Joaquin County. The objective of the work described in this Work Plan is to investigate potential contamination of imported fill, native materials, and groundwater at the planned Site for the San Joaquin County Government Center. Potential contamination includes petroleum hydrocarbon compounds, including semi-volatile organic compounds (SVOCs), and metals in the fill, native material (alluvium), and groundwater. The proposed work will include the advancement of at least 12 direct push borings to collect soil and groundwater samples, laboratory analysis of the soil and groundwater samples, geologic logging of the borings, and collection of pertinent field data. The results of the field work and the analytical data will be described in a Phase II ESA report. The field work is expected to start on April 2, 2007 and be completed by April 6, 2007. Condor anticipates providing a verbal summary of the investigation results to Mr. Karam by April 13, 2007. SITE BACKGROUND The Site is located south of Weber Avenue, between San Joaquin and Sutter Streets in Stockton, San Joaquin County, California, and consists of five commercial parcels in use as a paved city parking lot (Figure 2). The area proposed for study has been the site of numerous buildings demolished over a period of time. Based on the very limited information available, the imported fill, locally, may have been placed on abandoned concrete and brick foundation materials and abandoned utility tunnels, as well as placed on recent alluvial deposits consisting of sand, silt, and clay. Depth to first groundwater is anticipated to be approximately 30 feet below ground surface (bgs) in the alluvium. At present the Site is undergoing preparation for construction of the Government Center. Results of the Phase I ESA completed at the Site were not available for review during preparation of this Work Plan. The Phase I assessment data are expected to be available during preparation of the Phase II investigation draft report and the appropriate data, including significant findings and historical use of the Site, will be included in the final Phase II report. GEOPROBE BORING FIELD PROCEDURES This section includes a description of the Site preparation, Geoprobe boring procedures, proposed Site health and safety procedures, and laboratory analyses. CONDOR