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relativ PAR-Eckert Cot e]Y conductive of d Storage,Manteca,CR groturdrvater groundwater (clean November 25 2002 barriers(clay and sand)) and/or Potential horizons page s The second that may act as relative discrete boring at each goundwater Fair location was advanced Condor collected six grab samples from horizons identified within the ew f groundwater investigat groundwater sample$, three samples fro eet of the first baring to collect geologic logs from the first borings, m each CPT boring pair, during the deep Groundwater samples pies Fere collected using stainless steel screen, g a push-bye groundwater sam interval. The sampler push rad was sampler w as then r as pushed in a pier. The sampler has flow hydrostatically from the formation retracted ex closed position to the a sealed, lowering a stain/ rmation into pacing the inlet screen and desired sampling ess steel bailer through the inlet screen. The allowing groundwater was gh the groundwater sample Agroundwater ed to sample con gently emptied from the hollow push rods custod tamers were sealed, labeled bailer into thea and into the sam l Y Yproeedures to a , Placed in a cooler chilled ate laboratoryP e screen The California certified Iaborato with ice supplied containers. The The i laboratory for analyses. , and delivered under chain-of- cleansed, ezocone, groundwater sampler, stainless steel bailer, double rinsed with using laboratory-glade , and associated Push grouted with neat cement The h d water. Upon non-phosphate detergent rods were thoroughly p completion of the bo and de-ionized cement was tremied into ring and sarn Fater and �-0 FIELD the borehole to avoid brill ling' the borin s OBSERVATION, ging g were Field observations included to odors. Float' visual observation of the borings. g product or sheens were g A slight petroleum h not obsed g°und�'ater samples and CPT-1 and Ydracarbon odor was not In the groundwater detection of sample collected (romp"� and a moderate samples collected FIP-8. Petroleum h petroleum h in 'he groundwater saris from the remaining hydrocarbon odor was noted in the pies collected from g borings. The average Ydroearbon odors were not groundwater well casing measuring ge depth tO groundwater detected in sample S points was a the samples collected from the groundwater investi during the rnonitarin approx. 2 7.G$ gation (September 30, 2002). event conducted feet below the lust prior to monitor The surf soil the additional holes. The Pilot qpe encountered at the site was noted medium to dark brown were hand-au Burin wn sil gored to five feet b g the drilling of Fie_ h' sand with the silt content decrasip'e soils observed land the CPT pilot 6.11` With g with depth. generally consisted of ANALYSES The groundwater samples collected from the CP Method 80I5A4, and $TEX Laboratories of Ceres and selected T and H}'dropunch bo Ether , C'alifornia. Selected gasoline rings were analyzed for TPH_ (MTBE oxygenates/additives by Method G by tertiary-amyl erti ), ethanol, tertia gasoline axygenates/additives included Me 8254B b ary-amyl rnethYl ether tertiary-butanol, diasopropyI ether y Argon Laboratory certificates of analT E) 1'2`dibromae (D�E)� ethyl tertia dry! Terhary Butyl thane {EDB)> and 1 2 ry-butyl ether (ETRE), yses and the chain-of-custody for the samples are in 5.1 , -dichlaroethane (1,2-DCA), Data coE ct LTS OF LABORATORY ANALYSE _ eluded in Appendix D during the B GR4UNBWATER describing the lateral and groundwater manitorin analytical results vertical extent pf g event on September 30 for the September 30, 2002 event groundwater contamination2002 were utilized in ent are presented in ableIat the site. The laboratory on the following page. 1 CONDOR