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.� `+ i , ! { k- J - -y•,t 'ri ,s .. r i > it-i.` <br /> - <br /> �y10 Decemberr2001 <br /> hAGE=NCProtect•IVo. 95 01l4 <br /> Page 4,.6f5,' <br /> ` <br /> Analytical results:•for chlorinated.hydrocarbon compounds in';ground water samples are summanzed <br /> , 'y- r <br /> in Table .3: The laboratory,report-Pi'dJaborat ' ' .reports^(MXC mpbell 'Analytical Laboratory <br /> Reference No. 823.10 to 823.19) for October, QA/QC report and.chain=' '-cusfody'farm are included' v-, <br /> Appendrx C: <br /> A map'ofdissolved TPH=ss and VOCsJs,depicted`in Figu i <br /> _ re 4. <br /> 4.0. SUMMARY AND CONCLUSION. <br /> Basedupon the'results of the investigation; AGE co'ncluded'that; <br /> Ground water depths;within the established monitoring wells was approximately 24'feet bsg: <br /> Monitoring-wells'MW-1 through MW-5 at or near the site are "drowned"with well screen ` <br /> intervals-as much'as°10 feet below present ground water surface. The recently installed wells <br /> were screened across the,current water table level. <br /> TPH-ss was detected in the.njonitoring'well`samples on the site and.was not detected m the <br /> down gradierit;.ground wafer monitoring wells:at'the eastern edge and`off-site(MW 7.and <br /> ' MW-10). Ve low concentrat' <br /> rY _ _ ion of BTEX compounds were detected in"two of the on-site <br /> ground water samples. <br /> •', PCE and d TCE were'detected in thelwater samples collected from wells M�V6,.MW7 and well <br /> 1VIW-10, located .offsite; at concentrations• whieh exceeded the Maximurii Coritammant , <br /> Level' (MCL)-,of 5 ug%1 'established -by the' State of.California' - Department of. 1-6dlth.' <br /> Services: Detected concentrations ofcis-.1,2-dichloroethene and vinyl chloride also exceeded s <br /> their respective,MCL- <br /> • <br /> The lateral`extent of the dissblved halogenated-hydrocarbon plume has'notbeen,defined'east <br /> w or north of wells MW;-6 and MW-10'. A'map of.dissblved TPH-ss and VOCs is:depicfed',in ' <br /> Figure 4. ; <br /> RECOMMENDATIONST' <br /> Based:upon the`,results of the invest�gafion, AGE recommends: <br /> • The next,ground wafer monitoring"event should be scheduled for January 2002: <br /> Installation of up to 3 cone penetrometer testing soil borings to defuc the local hydrologic' <br /> ground water flow units;and.the vertical extent of'i <br /> mpacted-soil and ground water-:. <br /> Installation 'of'the' approved additional• ground water 'fonitoring' ' ll <br /> - <br /> we,. assess 'the <br /> , . <br /> chlorinated solvent,plume, off-site,toward'the northe'asi.� <br /> t - 'Advanced GeoEnv9ronmental,-Inc. <br />