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• • <br /> . lb April 1998 <br /> AGE-NC Project No 96-0263 <br /> Page 2 of 5 <br /> 3.0. REGIONAL GROUND WATER ELEVATION <br /> Information obtained from monitoring wells located at 2420 Grant Line Road and 2450 Toste Road <br /> indicate that groundwater depth at the site is between 8 and 10 feet bsg Ground water flow direction <br /> at the Grant Line site is northerly, consistent with flow direction in the Tracy area <br /> 4.0. SCOPE OF WORK <br /> The San Joaquin County PHS-EHD has directed the investigation of the release of petroleum <br /> hydrocarbons from the former UST system AGE proposes to install up to nine probe borings at the <br /> site to determine the lateral extent of hydrocarbon-impacted soil in the former UST area and if <br /> hydrocarbons have impacted the ground water at the site Additional soil boring may be advanced <br /> based on the extent and concentration of the hydrocarbons observed <br /> 41 PROBE BORING ADVANCEMENT <br /> iAGE proposes to initially advance_nme soil probe borings at the site to determine the lateral and <br /> �veitical extent of hydrocarbon-impne ed soil and ground water Borings will be advanced using a <br /> Geoprobe 5400 probing unit equipped with 1 25-inch probing rods Boring will be advanced with <br /> the follow criteria and locations <br /> • Six borings will be advanced to a depth of 15 feet bsg, while two probe boring will be <br /> advanced to a depth of 25 feet bsg to determine the vertical depth fo hydrocarbon impacted <br /> to soils at the site �,.� <br /> • Two probe boring will be advanced in the former UST excavation (one 25 feet bsg) <br /> • Three probe boring will be advanced surrounding the former UST excavation <br /> • Two boring will be established in the product line trench and dispenser area where <br /> significant contamination was encountered during the UST removal (one 25 feet bsg) ,/ <br /> q • Based on the Iateral extent of hydrocai bon-impacted gi ound water en.-.ountered at the site, <br /> I two additional probe borings will be advance in the know down-gradient direction f e <br /> UST area <br /> • Additional soil boirng may be advanced based on the extent and concentration of the <br /> hydrocarbons observed <br /> • <br /> Atli ar,ced GeoEmtronmental,Inc <br />