ARCHIVED REPORTS XR0010228 - Laserfiche WebLink

Home Browse Search

Former Discovery Chevrolet March 20, 1998 Tracy,California Problem Assessment Report All activities were completed in compliance with the State of California Water Resources Control Board's Leaking Underground Fuel Tanks (LUFT) Manual, the Regional Water Quality Control Board's Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites, and SJC DHS/EHD guidelines. Prior to performing the field work, Underground Service Alert (USA) was notified and a permit was obtained from SJC PHS/EHD to drill the soil borings (copy included in Appendix E). Horizon's Field Methods and Procedures are included as Appendix F. The field work was conducted in accordance with the Horizon Site Safety Plan dated February 16, 1998. 4.1 Soil Boring and Sampling On February 19, 1998, a Horizon geologist observed the advancement of soil borings GP-1 through GP-10. Inspectors Steve Sasson and Jeffrey Wong of the SJC PHS/EHD were present to witness all of the field work, and required an additional boring for further t4 , groundwater plume definition. The location of the soil borings were selected to attempt to delineate gasoline hydrocarbons in the soil and groundwater beneath the site, as proposed in the work plan approved by the SJC PHS/EHD. The soil borings were advanced and sampled using a truck-mounted Geoprobe direct push rig. The Geoprobe0 rig was operated by V & W Drilling, a C-57 licensed drilling contractor from Rio Vista, California. Groundwater was encountered in the borings between depths of approximately 81/2 to 10 feet bsg. During vertical penetration, soil samples were collected from the borings GP-1 through GP-9 at 5- foot intervals beneath the ground surface to the total depth of the borings. Additional boring GP-10 was pushed to collect only a groundwater sample, as required by the SJC PHS/EHD inspectors, for additional plume definition. All soil samples were screened for the presence of petroleum hydrocarbon vapors with an organic vapor meter (OVM). OVM readings noted during drilling are included in the soil boring logs. The soil boring logs containing soil descriptions are included as Appendix G. Groundwater samples were also collected from each boring and were contained, along with the soil samples, in chilled storage for transport to the laboratory for the requested analyses. 3001-12.par 5 HORIZON ENVIRONMENTAL INC.