Laserfiche WebLink
_ <br /> R <br /> Union fee Company _ weher Street <br /> Phase 11- 1Repad of ryndings <br /> Ell fr Page 3 <br /> that time. <br /> rsli <br /> 8. Recent tile Lipper <br /> aquifer <br /> wellscontaminatedlshow <br /> lDfor <br /> TPIand BTE&,XRemov d ofmostofthe soimay be <br /> directly related to this phenonlenon. <br /> 9. Well 4D, the lower aquifer well, sampled positive for minor levels (all <br /> r. below MCL's) of Toluene, Ethyl Benzene and Xylene in March, 1991, This <br /> well sampled "ND" for all constituents in April, 1991. Apparently there has <br /> been minor contamination of the lower aquifer, at this site. <br /> RECOMMENDATIONS <br /> ast corner of the <br /> edial <br /> 1. The remaining Should soils <br /> cl aracteritzed by�four (4 <br /> 7). borings (seelPlate <br /> excavation <br /> 7). <br /> i <br /> mediation plan will be submitted, if conditions <br /> 2. Once characterized, a soils re <br /> 's <br /> warrant doing such. <br /> 3. Since contaminant levels in the ground water, at this site, appears to have <br /> markedly improved since August of 1990, we recommend no further ground <br /> water remediation efforts be undertaken for the time being. Instead, the <br /> ground water contaminate levels and the elevation of the and water <br /> should be monitored on a quarterly basis for a one (1) y period. <br /> 4. If all ground water samples analyze either "ND" or below MCL's for <br /> BTE&X during the one (1) year period, then this site should be evaluated <br /> for closure by San Joaquin County Regulatory officials. <br /> Tile above represents our best professional opinion with respect to ground water flow <br /> and contamination conditions, at this site. These opinions were derived using the <br /> existing data at hand, and with reasonable standards of care common to the <br /> hydrogeologic consulting ::Gmmunity in Northern California 1990-199t. <br /> it should be understood that the above opinions were derived from observations of gco- <br /> logic conditions in soils and water samples taken from borings and monitor wells. <br /> These conditions were projected into unobserved ares of the site. The opinions, <br /> _ : .... .therefore, involve thougl7tfnl interpretation of th data <br /> t - <br />