WORK PLANS_FILE 1 - Laserfiche WebLink

Home Browse Search

Mr. Sam Savig �,� Project 880-040.1A December 12, 2001 Page 3 The two shallow wells will be constructed similar to the existing site monitoring wells and will be drilled to a total depth of 25 feet bgs and screened from approximately 10 to 25 feet bgs. Drilling and sampling procedures are included in Attachment B. The two downgradient wells will be installed using hollow stem auger techniques and will be included in the quarterly groundwater monitoring program. These wells will be permitted and installed according to SJCEHD standards. Task 2-Installation of One Deep Boring A deep boring is proposed adjacent to well MW-1 (Figure 3) to define the vertical extent of MtBE in soil and groundwater at the site. The boring will be advanced using hollow stem auger techniques. This boring will be continuously cored from 30 feet bgs to the total depth of 80 feet bgs. Continuous sampling will provide a complete lithologic description of subsurface conditions. A minimum of three soil samples will be submitted to the laboratory for the analysis of, TPHg by modified EPA Method 8015; benzene, toluene, ethylbenzene, total xylenes (BTEX) and di-isopropyl ether(DIPE), ethyl tertiary butyl ether(ETBE), MtBE, tertiary amyl methyl ether (TAME), and tertiary butyl alcohol (TBA), collectively the `five oxygenates', by EPA Method 8260B. An aquitard has been identified in the area at a depth of approximately 45-feet bgs. Should an aquitard be encountered the boring will be terminated to avoid compromising the lower aquifer. This boring will be permitted and installed according to SJCEHD standards. Task 3-DPE Pre-Event Activities Prior to conducting the DPE event, IT will submit a letter of notification to the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD). IT will also prepare a site-specific Health and Safety Plan (HASP). The HASP is required by the Occupational Health and Safety Administration (OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120) and by California OSHA "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192). The HASP will be reviewed by the field staff and contractors prior to beginning field operations at the site. A draft HASP has been included in Attachment C. Task 4-DPE and Feasibility Testing The DPE is planned to last five days. IT will connect the DPE to well MW-1 and will simultaneously extract soil vapor and groundwater from the well. The DPE test will be performed utilizing a mobile treatment system provided by TRC Alton Geoscience, Inc. Major features of this mobile treatment unit include: \\SACRFP 1\COMMON\.sacDP\2001\PRJ\PJ 8\8800401 A.1 ac.doc 12/12/01