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Site Background Information Sierra Lumber Manufacturers (Case #2) <br /> Page 2 of 2 <br /> the estimated depth to ground water at the site is approximately 20 feet below surface grade (bsg) <br />' Review of Lanes ofEqual Elevation of Ground Water Sprang 1999(FCD&WCD)shows the regional <br /> ground water flow direction toward the northeast However, review of recent ground water <br /> monitoring well data collected from monitoring wells at the site suggests a northwest ground water <br />' flow direction, though flow direction vary due to local recharge and discharge patterns Review of <br /> historical depth to ground water maps(FCD&WCD)dating back to 1971 suggests that ground water <br /> depth near the site has fluctuated between 15 feet and 50 feet bsg <br /> I <br />' PREVIOUS INVESTIGATIONS <br /> In June 2004, a series of soil borings were advanced at the site by Alta EM, Inc (AEI) as part of a <br />' property transfer Three soil borings (Alta-B3, Alta-B7, and Alta-B8) were advanced near the <br /> southeast corner of the Plant #2 building, in the area of a former underground storage tank (UST, <br /> Tank Area B) Petroleum hydrocarbons were detected in soil and ground water samples collected <br /> from the boring advanced within the presumed former tank pit excavation Total petroleum <br /> hydrocarbons quantified as gasoline (TPH-g) and volatile aromatic compounds benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) were detected in soil samples at concentrations as high as <br />' 4,920 milligrams per kilogram (mg/kg) TPH-g and BTEX were detected in a grab ground water <br /> sample collected from boring Alta-B3 at concentrations as high as 400,000 micrograms per liter <br /> (µg/1)and 25,300µg/1,respectively The approximate locations of the borings advanced and sampled <br />' by AEI are illustrated on Figure 2 Analytical results of borings Alta-133, Alta-B7, and AltaB-8 are <br /> summarized in Tables 1 and 2 of this appendix <br /> 1 <br /> 1 <br /> • <br /> 1 <br /> Advanced GcoEnvironmental,Inc <br /> 1 <br />