Laserfiche WebLink
06 June 1997 <br /> i AGE-NC Project No 96-0254 <br /> Page 2 of 5 <br /> analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), volatile aromatics <br /> (benzene, toluene, ethylbenzene and total xylene BTE&X), lead and ethylene dibromide (EDB) <br /> Concentrations of TPH-g and BTE&X were detected in each soil samples from the tank excavation <br /> EDB was detected in one sample at a concentration of 2 9 parts per million (ppm) <br /> TPH-g and BTE&X were detected in the water sample at concentrations of 150,000 parts per billion <br /> (ppb), 25,000 ppb, 43,000 ppb, 5,700 ppb and 32,000 ppb, respectively Lead was detected at a <br /> concentration of 0 67 ppm in the water sample, however, EDB was not detected <br /> 3 0. REGIONAL GROUND WATER ELEVATION <br /> Information obtained from monitoring wells located at 2420 Grant Line Road indicates that <br /> groundwater depth at the site is between 8 and 10 feet bsg Ground 1Nater flow direction at the Grant <br /> 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 foimer UST release of <br /> petroleum hydrocarbons AGE proposes to install up to eight probe borings at the site, to determine <br /> the lateral extent of hydrocarbon-impacted soil in the former UST area and impacted ground water <br /> at the site Additional soil boring may be advanced based on the extent and concentration of the <br /> hydrocarbons observed <br /> Hydrocarbon impacted ground water was encountered at the site during the US f removal Therefore <br /> monitoring wells at the site will installed by the piocedures outlined in the Site Contannnalron Woi k <br /> Plan dated February 1995 <br /> 4 1 PROBE BORING ADVANCEMENT <br /> AGE proposes to initially advance eight soil probe borings at the site to determine the lateral and <br /> vertical extent of hydrocarbon-impacted soil and ground water Borings will be advanced using a <br /> Geoprobe 5400 probing unit equipped with 1 25-inch probing rods Each boring will be advanced <br /> to a depth of 15 feet bsg <br /> Four probe boring will be advanced surrounding the former UST excavation Based on the lateral <br /> extent of hydrocarbon-impacted ground water encountered at the site, four additional probe borings <br /> will be advance in the know down-gradient direction from the UST area, for the collection of grab <br />