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, <br /> .^:: .•..r r y: Y:'. . .:,:. _...r,«H : a .: ...>: - ( - - - • -• I.x:, J:. .: N:.Yy..Jil F <br /> Quarterly Report July .1998. <br /> STRONG PROPERTY <br /> ­5157`WesfBusiness Loop'205, Tracy,'California , <br /> INTRODUCTION AND,-SCOPE OF WORK ; <br /> In.accordancewith a request from.Ms. Ruth'Strong,Advanced GeoEnvirorimeintal;.Inc..(AGE)'ha§,'= <br /> this PreliminaryInvesti ation and Evaluation Re ort. IER for 5157 West Business Loo _ <br /> prepared g P ). P ' <br /> 205 iii Tracy, California. The location of the site is illustrated in'Figure'1; general features at the?site.' <br /> ar•e illustrated-in'Figure 2. ; <br /> The-scope ofwork of this investigation,included-advancement'of six soil borings and installation.of <br /> " four groundwater monitoring,wells on'and off-site with the objective of assessing and monitoring <br /> subsurface impact of petroleum hydrocarbons. This report is prepared in�accordance with guidelines <br /> Count Public'.HeaIth`Services-- Environmental Health ,. <br /> _ P P. P, - ,. g ..... <br /> . - established by the San Joaquin. y. _ �Division <br /> ,(PHS-EHD)and by the Central Valley,Regional'Water Quality Control Board for investigation-of 1, <br /> 'underground storage tank (UST)„sites. <br /> 2.0. BACKGROUND <br /> 2.1.. . SITE LOCATION AND DESCRIPTION <br /> j <br /> the site is' located on the north`side of West Business Loop 205 between'Bird.Road and Banta-Road,approxinmate.ly three'miles east of Tracy, San Joaquin ,County, California (Figure 1).'The site is ' <br /> located within the southeast quarter of Section 24,'Township 2 South, Range 5 East,,Mount Diablo', <br /> Base and Meridian(Vernalis'Quadranglel, 7 5 Minute USGS Topographic Scries, 1991) <br /> One structure.,is located on'the property and is presently unoccupiedAt is our.briderstandizmg.that the <br />' site historically operated as a'truck depot. , <br /> 2.2: UNDERGROUND,STORAGE TANK.REMOVAL: <br /> - It is our under`standirig:that six.USTs'were removed from the'siteln'August 1989 The USTs'ranged <br /> in volume-:up to.110;000 gallons-During tank,removalractivities;,three.grab-ground.water'samples <br /> were collected from the tank'pit excavation.•Laboratory'analysis of the grab ground water samples <br /> detected'volatile' aromatics (benzene; toluene, ethy)benzene and xylenes: BTEX)'at'concentratians <br /> ranging`as high as 120,000 parts per bi. ion,(reporfed as;micrograms per liter,ppb); benzene was <br /> detected at;concentrations as high as 7,700!ppb' The highest'BTEX concentrations'were detected in <br /> --the water sairiple collected from-the north portv'ion of the remoA'excavation <br /> To- <br /> " Soil samples were collected from the base of the piping trench as well' the sidewalls and base of <br /> the UST,removalexcavation. The 'laboratory analysis detected•tetra ethyl lead (TEL) at a- <br />