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y Table 2. Groundwater Chemical Data, con't Well No Date TPHG B T E X MTBE ------------------------------u g/I------------------------------- MW-2 6/27/96 ND ND ND ND ND NA MW-2 9/23/96 ND ND ND ND ND NA MW-2 12/19/96 ND ND ND ND ND ND MW-3 6/27/96 ND ND ND ND ND NA MW-3 9/Z3/96 ND ND ND ND ND NA MW-3 12/19/96 ND ND ND ND ND ND ND- None detected NA - Not Analyzed ug/1 - micrograms per liter Discussion Groundwater flow direction appears consistent to the historic trends However, recent heavy precipitation and regional flooding may locally affect groundwater flow . The concentrations reflect a slight increase of levels of TPHG and BTEX in Well MW-1 Some fluctuations in concentrations are attributed to residual contaminants in the soil strata in the immediate vicinity of the former tank pit Wells MW-2 and MW-3 continue to show a none detected trend In Wright's opinion, contaminant concentrations at MW-1 are anticipated to continue to a overall decreasing trend Monitoring Schedule The quarterly monitoring for this site is scheduled to continue at quarterly intervals Limitations This report has been prepared specifically for the M & M site at 60 E 10th Street, Tracy, CA, and was done according to the State and local agency suggested guidance documents for these investigations The interpretations, conclusions and recommendations made herein are based on the data and analysis for the water samples collected on-site and should be reviewed in the context of the whole report Please note that reports of contamination must be submitted to the agencies in a timely manner Wright Environmental Services, Inc is not responsible for errors in laboratory analysis and reporting, or for information withheld during the course of the study No warranty or guarantee is expressed or implied therein i M & M Automotive Project No 4100-QM Page 3 i