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t <br /> Table 2. Groundwater Chemical Data <br /> Well No Date TPHG' Ben Toluene Ethylben Xyl MTBE TBA DIPE ETBE TAME <br /> ug/l <br /> MW-1 No Data-Monitoring Well Destroyed, June, 1999 <br /> MW-2 1127100 NO NO NO NO NO NO ND NO NO NO <br /> MW-3 1/27100 NO NO ND NO NO NO NO NO NO NO <br /> MW-4 1/27/00 ND ND NO ND NO NO ND ND ND NO <br /> Blank 1/27/00 ND ND ND NO NO NO NO NO ND NO <br /> NO- None detected NA- Not Analyzed ug/I - micrograms per liter <br /> Methyl-tert-butyl-ether(MTBE), Tert-Butyl Alcohol (TBA), Di-Isopropyl Ether DIPS), Ethyl <br /> Tert-Butyl Ether(ETBE)and Tert-Amy] Methyt Ether(TAME) <br /> VOC deleted from sampling at PHS-EHD request Jan , 2000 <br /> Discussion <br /> Groundwater flow direction appears consistent with historically observed trends Neither TPHG, BTEX <br /> nor MTBE/oxygenate contaminants were observed in any well Fluctuations in contaminants are <br /> attributed to residual contaminants desorbing into the groundwater from the soil strata in the immediate <br /> lie vicinity of the former tank pit <br /> Well MW-1 was destroyed during the sod excavation from former underground tank pit source to remove <br /> residual contaminants which had historically been observed at MW-1 PHS-EHD will be contacted when <br /> a date is scheduled to replace this well <br /> Conclusions and Recommendations <br /> Wright has completed the excavation of contaminated soil in the vicinity of the former underground tank <br /> pit source and well MW-1, and contaminant mass estimates indicate that very low levels, relatively <br /> immobile residual hydrocarbon contaminants remain in the former tank pit vicinity Nether TPHG, BTEX <br /> or MTBE or oxygenate contaminants were observed in the three existing wells <br /> Wnght will schedule quarterly monitoring for this site pending PHS EHD review of this report <br /> Limitations <br /> This report has been prepared specifically for the M & M site at 60 E 10th Street, Tracy, CA, and was <br /> done according to the State and local agency suggested guidance documents for these investigations <br /> The interpretations, conclusions and recommendations made herein are based on the data and analysis <br /> for the water samples collected on-site and should be reviewed in the context of the whole report <br /> Please note that reports of contamination must be submitted to the agencies in a timely manner Wright <br /> Environmental Services, Inc is not responsible for <br />