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1 <br /> 20 June 2001' <br /> AGE-NC-Project.No. 98-0440 <br /> I`. -Page 3 of 6 , <br /> 3.2. GROUND WATER ANALYTICAL-RESULTS <br /> TPH-gwas detected in the'water samples collected from monitoring wells MW 1, MW2, MW5 and <br /> MW at concentrations of 76 micrograms per liter (/: g/l), 440 µg/l, 1,500 µg/1 and 1,100 µg11,. <br /> respectively. TPH-d was detected-in the same water samples at concentrations as high as 330 µg/1: <br /> in MW6., <br />' 'Bene wdetected-in, <br /> e c <br /> teted'in oundwater samples collected from wells MWl MW2 and MWS at <br /> ne. as de gr � p _ � � <br /> concentrations.-as high as 97 µg/1 in well.MW5. The other BTEX compounds were detected in <br />' samples from.monitoring wells•MW 1, MW2, MW5 and MW6, with the exception.of total xylenes <br /> In MW 1, at concentrations ranging from 1.l ug/1-of toluene iri MW 1 to 230.µg/1 of ethyibenzene in <br /> MW6. MTBE was not detected4bove laboratory reporting limits in any-of the ground water samples <br /> collected and'analyzed. K ; <br /> Toluene was detected in the water sample collected from domestic well DW5157 at a concentration ' <br /> Of 3.9 ug/l. No other analytes were detected in the sample collected from DW5157. <br /> . Current and previous analytical results are summarized on Table 2. The laboratory report (MAI Lab , <br /> ID No. 62994 through'' 63000), QA/QC report and chain-of-custody form 'are- included in <br /> Appendix B.-I, <br /> 4.0. SITE CONCEPTUAL.MODEL <br /> AGE has constructed a site conceptual model based on site history, inferred .geological' and <br /> p. , <br /> hydrological inodel and known contaminant distribution. <br /> 4.1. ' BACKGROUND. <br /> The site is located on the northiside of West Business Loop 205'between-Bird Road and Banta•'Road,, <br /> approximately three miles'east of Tracy; San Ioaquin'County, California' I re 1). -The site is ' <br /> :.located within the southeast quarter of.Section 24, Township 2-South, Range 3-East,,Mount Diablo <br /> Base and Meridian '(Yemalis Quadrangle,-7.5-Minute USGS.Topographic Series, 1991). One. ' <br /> structure is located on the property and-is:presentlyunoccupied. AGE has been informed that the site..,: <br /> historically'operated as a truck depot. Additionally tliree private water wells'are;located in close <br /> proximity to'ihe site, toward the east,,west arid'north. (Figure'3),' „ <br /> AGE has been'also informed that six USTs were removed from the•site,in:•August 1989. The USTs <br /> ranged in volume'up to 10,000,gallorisoThree.grab"' and water samples and ten soil samples were <br /> r <br /> Advanced Ge oEnvironmental,Inc. <br />