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3 <br /> 13 February 2003 <br /> AGE-NC Project No 95-0184 <br />' Page 4 of 5 <br /> • The ground water was inferred to flow generally northward across much of the site at a <br /> gradient of approximately 0 009 ft/ft (Figure 2), however, the ground water was inferred to <br /> flow toward the east in the southeastern portion of the site I I <br /> • Detectable concentrations of TPH-g were Lound in all of the ground water wells sampled <br /> SaIW-BTEX compounds were found in all gi ound eater samples,ekcept for m,p-xylenes in ground <br /> water sample MW-7,these samples contained one of more analytts at concentrations above <br /> California's Maximum Contaminant Levels (MCLS) <br /> • No free product was measuied during this sampling event,however,most of the well sc.reeiis <br /> rare drowned and are not likely to produce direct evidence of free product <br /> • Theiopy enated volatile orr c compound MTBE was detected at a concentrations rangi rig , <br /> Ervin }ig/l (VW- to µgel (VW-4), hone of the other oxygenated volatile organ,cs <br /> were detected at concentrations above Eaboiatoiy reporting hrriits <br /> • The concentrations of MTB1-, F-, ))5 ,tile' :,2-DCA in the ground water samples exec eel the <br /> DHS MCLS for drinking wa,ei <br /> • Naththalene, 1,2,4.-trimethylbenrene, 1,3,5-trrmethylbeiizene and n-propylben7enr were <br /> detected in ground water samples at coiicontrations above the DHS-recommended di inking, <br /> water action levels <br /> • The vertical and lateral extent of impac'cd soil anti ground water h,-5 not yet been do fiiricd <br /> 5.0. RECOMMENDATIONS <br />' Based upon data collected from the site, AGF. rcc t,w.—riends <br /> • Continued quarterly ground water inomtoring,the fourth quarter 2002 rrionitoi ing event was <br /> performed in December 2002, the iepori is in preparation <br />' • Since analyzing for BTEX ,coropounds and MTBE is included to the full-scaii EPA <br /> Method 8250 required for the sit:, analyzing BTEX compounds and MI BE agav-i lhy f P,k <br /> Method 8021 is redundant and should be discontinued <br /> I , <br /> Two of four proposed cone-penetrometer tett (CPT) soil boiings were advanced to a ma\irtiurri <br />' depth of 180 feet bsg on 13 to 15 Noverrinei 2001 'to assess the vertical and lateral extent O <br /> impacted soil and ground watei, to define nydrogr,c)iugic slow units at the site, and ic'opt,rniri <br /> locatLons of additional monitoring and extiac ik� wells, nowever, ground water was still unpack d <br /> at 1811► feet AGE is preparing an addition to We oii€rn it Fork Plan Addenduni - F'e < ry7 0} to <br /> advance the two remaining CPT borings to 200 fel=t bsg c7 id1`'a Z©Ut � <br /> • to <br /> Advanced GeoEnviro"Lli,aW Ir- <br />