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ARCO Products Company • • 3 <br /> ARCO service Station#595,6100 North Highway 99,Stockton,CA February 28,2000 <br /> • on Figure 2 Soil borings will be drilled using an 10-inch diameter <br /> hollow stem auger Upon completion of drilling, a 4-inch diameter <br /> groundwater monitoring well will be installed in each boring <br /> Groundwater is anticipated to be encountered at approximately 70 feet <br /> bgs The wells will be screened from approximately 10 feet below <br /> ground surface to 10 feet below where groundwater is first <br /> encountered <br /> • Permitting The applicable permits for groundwater momtonng and <br /> soil vapor extraction wells will be obtained from the SJCEHD prior to <br /> drilling <br /> • Soil Selection and Analysis. Soil samples will be collected at 5-foot <br /> intervals and will be sent under chain-of-custody procedures to a <br /> California State-certified laboratory Selected soil samples will be <br /> analyzed for total petroleum hydrocarbons calculated as gasoline (TPH- <br /> g) using modified EPA Method 8415, and benzene, toluene, <br /> ethylbenzene, xylenes, MtBE using EPA Method 8020 Additionally, <br /> selected soil samples including the sample collected from the capillary <br /> fringe in each boring will be analyzed for MtBE, DIPS, TAME, EtBE, <br /> TBA, 1,2 DCA, and EDB by EPA Method 8260 <br /> • Monitoring Well Development and Sampling. After installation, <br /> the monitoring wells will be developed by rigorously surging the well <br /> over the length of the screen interval and by purging approximately 10 <br /> casing volumes of water After well development, groundwater <br /> samples will be collected from wells MW-1 through MW-4 and the <br /> onsite domestic well and sent under standard chain-of-custody <br /> procedures to a California State-certified laboratory (Sequoia <br /> Analytical) The groundwater samples will be analyzed for TPH-g <br /> using modified EPA Method 8015, BTEX and MtBE using EPA <br /> Method 8020, and fuel oxygenates by EPA 8260 <br /> • Well Surveying. Upon completion of well construction, the wells will <br /> be surveyed by a licensed surveyor to a local benchmark relative to mean <br /> sea level Groundwater gradient will be interpreted utilizing wellhead <br /> elevations and depth-to-water measurements <br /> • Well Search. A 1/2-mile radius well search will be performed to <br /> evaluate potential sensitive receptors in the area of the site <br /> • Report. A report will be prepared after completion of necessary field <br /> work The report will include soil boring logs, soil analytical results, <br /> chain-of-custody documentation, and conclusions <br /> 077 419413 10/WPLAN2 <br />