WORK PLANS - Laserfiche WebLink

Home Browse Search

• Herman&Helen's Marina—Work Plan Additional Soil and Groundwater Investigation ' Surface Water Sampling May 27, 1998 Page-2- Based on the results of the Geoprobe investigation, Condor recommended that monitor wells be installed at the site to investigate and monitor the lateral extent of the gasoline and diesel contamination plume. On September 10, 1997, Condor installed four monitoring wells at the site. The Report-Additional Soil and Groundwater Investigation, dated December 11, 1997, was prepared by Condor to describe the investigation results. ' Laboratory analysis indicated that TPH-G,BTEX constituents,MTBE, tertiary butanol,and tertiary amyl methyl ether (TAME) were detected in some of the soil and groundwater samples collected during the investigation. Groundwater elevation data indicated that groundwater flow at the site was probably controlled by the very active island drainage pumping adjacent to the site. The above referenced report recommended quarterly groundwater monitoring, surface water sampling, and Risk Based Corrective Action(RBCA)to further characterize the site and to evaluate options for remediation or site closure. A comprehensive site background is included as Appendix B. 3.0 FIELD AND ANALYTICAL METHODS This section includes a description of the proposed site preparation, Geoprobe borings, surface water sampling and laboratory analysis. All work conducted by Condor will be performed under the supervision of a California State Registered Geologist. Fieldwork and reporting will be conducted in accordance with the PHS/EHD, the Reclamation District #2029, and the California Regional Water Quality Control Board(CRWQCB)guidelines and requirements. ' 3.1 SITE PREPARATION Prior to the fieldwork, authorization will be obtained from Reclamation District 92029 for the work to be conducted on or near the levee. Adjustments will be made to the scope-of-work, as needed,to satisfy the Reclamation District requirements. Upon receipt of authorization from the Reclamation District, drilling permits will be obtained from the ' PHS/EHD. The proposed sampling locations will be marked with white paint and Underground Service Alert (USA) will be notified at least 72 hours in advance of the fieldwork to locate and identify underground utilities in and near the work area. The PHS/EHD and the Reclamation District#2029 (or ' Reclamation District representative) will be notified of the fieldwork schedule at least 72 hours in advance. No work will take place on the levee during times when the Reclamation District suspects tides may create dangerous working conditions. ' 3.2 DRILLING PROCEDURES 3.2.1 Geoprobe Borings ' The fieldwork will include the installation of at least five borings using direct push technology (Geoprobe) at the proposed locations shown in Figure 3, Appendix A. Additional borings may be ' installed depending upon site conditions. The Geoprobes will be installed by Vironex Environmental of Foster City, California. A Condor geologist will be on site to supervise all work. Prior to commencement of fieldwork, a tailgate safety meeting will be held and a site-specific Health and Safety ' Plan will be discussed with, and presented to, all crew members for their signatures. A copy of the Health and Safety Plan is contained in Appendix C of this document. 1 ' j�• CONDOR