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itl <br /> Contaminant mass estimates indicate that very low levels, relatively immobile residual <br /> • hydrocarbon contaminants remain in the former tank pit vicinity Very low concentrations of <br /> VOC were observed at MW-2 and MW-3 These contaminants are typical of a dry cleaner source <br /> and occur in upgradient well MW-2, showing that they did not arise from M and M An <br /> upgradient source for these VOC contaminants is indicated with contaminants appearing to be <br /> moving toward downgradient well MW-3 <br /> Wright recommends that the quarterly monitoring for this site continue at quarterly intervals <br /> pending PHS EHD raw <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 /> 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 <br /> the study, and no warranty or guarantee is expressed or implied therein <br /> If you have any questions concerning this report, please call <br /> Sincerely, <br /> Wri ht Environmental Services, Inc <br /> t N° 7262 <br /> r / t-�[,(��-l�c��G��.� CEI�TI�IED � <br /> A EIiCi IEERI�1G <br /> Jo n Lynch / Christopher M Palmer s GEOLOGIST <br /> Principal C E G 1262, HG 246 <br /> Attachments, Table 3 Historic Groundwater Chemical Data <br /> Figure 1 Site Plan and Groundwater Contour Map, October 5, 1999 <br /> Figure 2 Historic Range of Observed Groundwater Flow Directions <br /> Figure 3 Soil Excavation Cross Section <br /> Groundwater Sampling Information Sheets <br /> Chemical Analytical Data and Chain-of-Custody Forms <br /> References <br /> Lyman, W J , Reidy, P J and Levy, 6, 1992, Mobility and Degradation of Organic <br /> Contaminants in Subsurface Environments Smoley, Chelsea, MI, 395 pg <br /> Wilson, J L , Conrad, S H , Hagan, E , Mason, W R and Peplinski, W , 1988, The pore level <br /> spatial distribution acid saturation of organic liquids in porous media NWWA Petroleum <br /> Conference Proceedings, Houston, pgs 107-133 <br /> cc Mr . & Mrs . Richard Moe <br /> Page 6 <br />