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I10 September 2002 <br /> . AGE-NC Project No 95-0184 <br />' Page 4 of 5 <br /> northwestern edge of the site to 0 005 ft/ft in the southern portion of the property.The ground <br />' water flow direction vanes from northwest near the northwest corner of the site to southeast <br /> along the south side of a ground water finger in the northern portion of the site, the flow <br />' direction over much of the site is generally northeast <br /> • Detectable concentrations of TPH-g were found in all of the ground water wells sampled <br /> S,yA&BTEX compounds were found in all ground water samples,except for MW-7,these samples <br />' contained one or more analytes at concentrations above California's Maximum Contaminant <br /> y,M1gl <br /> D ) Levels (MCLS) <br />' No free product was measured during this sampling event,however,most of the well screens <br /> are drowned and are not likely to produce direct evidence of free product <br />' hhee oWg/l <br /> nated volatile or aonic compound MTBE was detected in concentrations ranging <br /> / froi ` (MW� to ggll (VW-4), none of the other oxygenated volatile organics <br /> t.&%• � <br /> A 1."34 were detected at concentrations above laboratory reporting limits N° PIPE- W4a MW <br /> "-.3 <br /> }1 L �,ai <br />' The concentrations of MTBE, EDB and 1,2-DCA in the ground water samples exceed the Ov- <br /> DHS' MCLS for drinking water <br />' • • Naththalene and n-propylbenzene were detected in ground water samples at concentrations <br /> above the DHS-recommended drinking water action levels <br /> • The vertical and lateral extent of impacted soil and ground water has not yet been defined <br /> 1 <br />' 5.0. RECOMMENDATIONS <br /> Based upon data collected from the site, AGE recommends continued ground water monitoring <br />' Two of four cone-penetrometer test (CPT) soil bonngs originally proposed in the AGE-prepared <br /> Work Plan Addendum-July 2001 were advanced between 13 and 15 November 2001,to amaximum <br />' depth of 180 feet bsg, to assess the vertical and lateral extent of impacted soil and ground water, to <br /> define hydrogeologic flow units at the site, and to optimize locations of additional monitoring and <br /> extraction wells,however,ground water was still impacted at 180 feet AGE is preparing an addition <br />' to the original Work Plan Addendum -July 2004 to advance the two remaining CPT borings to 200 <br /> feet bsg and install multilevel monitonng wells <br /> 1 <br /> 6.0. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> . environmental consultants practicing in this or similar localities The findings were based upon field <br />' Advanced GeoEnvironmental,[Fie <br /> 1 <br />