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ia <br /> r� • i <br />�j Table 2. Groundwater Chemical Data <br /> Well No Date TPHG Ben Tol Ethylben Xyl MTBE TBA DIPS ETBE TAME <br /> --------------------------------- ug/l -------------------------------- <br /> MW-1 -------- No Data - Monitoring Well Destroyed, June, 1999 <br /> MW-2 4/20/00 ND ND ND ND ND ND ND ND ND ND <br /> MW-3 4/20/00 ND ND ND ND ND ND ND ND ND ND <br /> MW-4 4/20/00 73' ND ND ND ND ND ND ND ND ND <br /> Blank 4/20/00 ND ND ND ND ND ND ND ND ND ND <br /> ND - None detected NA - Not Analyzed ug/l - micrograms per liter <br /> Methyl-tert-butyl-ether (MTBE), Teri-Butyl Alcohol (TBA), Didsopropyl Ether DIPE), Ethyl <br /> Tert-Butyl Ether (ETRE) and Tert-Amyl Methyl Ether (TAME) <br /> VOC deleted from sampling at PHS-EHD request Jan , 2000 <br /> * - Laboratory notes that this does not match their gasoline standard <br /> Discussion <br /> Groundwater flow direction appears consistent with historically observed trends TPHG was <br /> observed in Well MW-4, however, it did not match the gasoline standard Neither BTEX nor <br /> 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 <br /> immediate vicinity of the former tank Pit <br /> Well MW-1 was destroyed during the soil excavation to remove residual contaminants which <br /> had historically been observed at MW-1 Additional borings are scheduled for drilling and <br /> sampling, and PHS-EHD will be contacted when a date is scheduled for field work <br /> Conclusions and Recommendations <br /> TPHG was observed in Well MW-4, but it did match the laboratory standard Neither BTEX nor <br /> MTBE/oxygenate contaminants were observed in any well Groundwater flow trends are similar <br /> to those historically observed <br /> Wright 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, <br /> and was done according to the State and local agency suggested guidance documents for these <br /> investigations The interpretations, conclusions and recommendations made herein are based on <br /> the data and analysis for the water samples collected on-site and should be reviewed in the <br /> context of the whole report Please note that reports of contamination must be submitted to the <br /> �l agencies in a timely manner Wright Environmental Services, Inc is not responsible for <br /> errors in laboratory analysis and reporting, or for information withheld during the course of i <br /> Page 4 <br />