Laserfiche WebLink
Metadata
Document management portal powered by Laserfiche WebLink 9 © 1998-2015 Laserfiche. All rights reserved.
t " <br /> 29 April 2005' , <br /> AGE-NC Project No. 98-0440; ; <br /> Page 3 of 18 <br /> been reported. <br /> • The well located at 5225 West Business Loop 205 (DW-5225) which supplies water to the <br /> IF r <br /> residents'of 5225 West Business Loop;205: is-located 250 feet north of the site. The well is <br /> located cross-to dawn-gradient of the former UST area. Permission to sample this <br /> wwell was . <br /> denied by the well owner. However;wells MW-3 and MW-10,which are situated between .' <br /> well DW-5225 and the former UST area-indicate that the petroleum hydrocarbon plume is <br /> not migrating beyond these wells., .. ` <br /> The well located at 5055 West Business Loop 205 (DW-5055)tivhich.supplies wat&'to the <br /> San Joaquin Valley Hay Growers Association is located 200 feet northeast of.the site in the <br /> i. down gradient direction. .DW-5055'has been sampled-for TPH'g and BTEX compounds <br /> routinely over the past`2 years. No detections of TPH-g or benzene,have'been reported. <br /> No additional wells were located within 2,000 feet of the subject property on the DWR database or <br /> the SJCFC&WCD map.No other wells were identified during the physical survey. Figure 3 depicts ' <br /> the approximate location of the water wells located during the well search within a 2,000 foot radius <br /> of the site. Copies of the well driller's reports are included as Appendix B. <br /> 2.4. UST REMOVAL <br /> It is our understanding that six USTs were removed from the site in Au ust'1989. The USTs'ranged <br /> in volume up to 10,000 gallons. During:tank removal activities; three grab groundwater samples <br />'F were collected.from the tank pit excavation. Laboratory analysis of the•grab,ground,water samples <br /> detected'Volatile aromatics (benzene,toluene, ethylbenzene'and xylenes: BTEX)at concentrations <br /> ranging as high as 120,00Q.rnicrograms per liter:µg/1;benzene was detected at concentrations as high . <br /> as 7,700 4g/1..The highest BTEX concentrations were detected„in the water sample collected from ' <br /> the north'portion of the excavation: = <br /> Soil samples were collected from the base 6f.the piping trench'asWell as thesidewalls and base'of. <br /> the 'UST removal excavation. The”laboratory analysis „detected' tetraethyl, lead (TEL) at .a <br /> concentration of 1,200 micrograms per,kilograin:,µ?/kg in a'soil sample collected from the eastern <br /> portion of the UST removal excavation. The laboratory.'detected total'petroleum hydrocarbons <br /> quantified as gasoline(TPH-g)at concentrations'ranging as high as 1,700;000µg/kg,The laboratory ; <br /> detected'BTE.X at concentrations ranging as high' as 370,000 µg/kg;'I:the, greatest benzene <br /> t 'concentration was 12,000'µg/kg.The highest TPH-g and BTEX concentrations were deteeted-in the <br /> samples'collected from the east portion of the UST removal'excavation. <br /> 1 Advanced GeoEnvironmental,Inc. <br />