ARCHIVED REPORTS XR0000632 - Laserfiche WebLink

Home Browse Search

Parsons Engineering Science, Inc feet bgs These results suggested that soil contamination might not be limited to the Greyhound property On February 3, 1995, PHS-EHD provided a letter to Greyhound recommending that further soil investigation be conducted to the west of the former dispenser and tank pit area and any other areas where contamination currently existed In response, a work plan was submitted and subsequently approved The conduct of work and results are described in the following section More recently, PHS-EHD has indicated (verbal communication) that the site could be considered for closure In response, this report was prepared SITE INVESTIGATION Introduction The section describes work recently performed to confirm the western lateral and vertical limits of any soil or groundwater contamination that may be present This work was performed between August 26, 1996 (soil boring advancement and monitoring well installation) and September 4, 1996 (groundwater sampling), and was conducted in accordance with the PHS-EHD approved work plan (Parsons ES, 1995) Prior to the advancement of the soil boring and installation of the monitoring well, the requisite permits were obtained from both the City of Stockton and from the PHS-ESD (Appendix A) All held activities were conducted under the supervision of a California Registered Geologist (RG) All field activities were documented in bound field notebooks and with photographs (Appendix B) Soil Boring and Soil Sampling Procedures In order to characterize the western limits and horizontal and vertical extent of any soil contamination that may be present, one additional soil boring (SB-9) was advanced offsite west of the former USFT pit and associated piping As described below, a monitoring well (MW-4 in Figure 2) was subsequently installed in the boring Prior to advancing the boring, all subsurface drilling equipment was thoroughly decontaminated by steam cleaning The boring was advanced to a maximum depth of 51 5 feet using hollow-stem auger and five-feet interval, split-spoon sampling techniques in accordance with established American Society for Testing and Materials (ASTM) Standard D-1586 All soil samples retrieved from the soil boring were visually inspected for signs of staining and screened for the presence of hydrocarbon odors and the evolution of organic vapors with a PID All soil samples collected (a total of 10 samples) were submitted for analysis of TPH-D using United States Environmental Protection Agency (EPA) modified Method 8015 and for BTEX using EPA Method 8020 in accordance with California Department of Health Services (DHS) Leaking Underground Fuel Tank (LUFT) Manual requirements All soil samples were logged in the field by an experienced Parsons ES geologist PARESSYR01 VOL]RIWP172760780969127607R03WW6 5