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' 01 September 1999 <br /> p i <br /> AGE-NC Project No 97-0301 <br /> Page 5 of 10 <br /> hydrocarbons down-gradient of the former UST area, <br /> • Between 40 and 50 feet northeast of boring P-1 to assess the extent of dissolved petroleum <br /> ' hydrocarbons down-gradient of the former UST area, <br /> • Between 30 and 40 feet east-southeast of boring P-4 to assess the extent of dissolved <br /> ' petroleum hydrocarbons cross-gradient of the former UST area <br /> i <br /> I <br /> The proposed ground water monitoring well locations will be advanced to approximatel} 55 feet bsg <br /> ' utilizing a truck-mounted, hollow stem drill ng equipped with 8-inch diameter hollow-stem augers <br /> Total depths of borings may vary according to hydrogeologic/geologic conditions encountered <br /> during drilling activities <br /> Selected soil samples will be analyzed by a State of California Department of Health Services <br /> ' (DHS)-certified laboratory for the following constituents <br /> • TPH-g, TPH-d and TPH-k in accordance with EPA Method 8015 Modified/5030, <br /> lie • BTEX compounds and methyl tert-butyl ether (MTBE) in accordance with EPA Method <br /> 8020, and <br /> • Fuel oxygenated compounds including MTBE, TBA, DIPE, ethyl tertiary-butyl ether <br /> (ETBE) and tertiary-amyl methyl ether(TAME) by EPA Method 8260 Modified <br /> ' Laboratory reports for the soil analyses,testing methods,laboratory quality assurance/quality control <br /> (QA/QC) reports, and sample chain of custody documentation will be presented in a report with <br /> findings and recommendations <br /> Selected soil samples will be analyzed by a microbiological Iaboratory for microbial enumeration <br /> and physicochemical characteristics, selected soil samples may also be analyzed for intrinsic <br /> permeability, moisture content, porosity and total organic carbon (TOC) in accordance with the <br /> 1 appropriate EPA or ASTM methods Laboratory reports for soil analysis and sample chain of <br /> custody documentation will be presented in a report with findings and recommendations <br /> ' 3 3 MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> At least six ground water monitoring wells will be installed at the site to further assess petroleum <br /> . hydrocarbon impacts to shallow ground water Proposed monitoring well locations are illustrated <br /> on Figure 2 Well locations are proposed to provide definition of the lateral and vertical extent of <br /> dissolved hydrocarbons Monitoring of the wells should provide data to determine if the dissolved <br /> 4diwired GcoEnriron mcntal,Inc <br />