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Philip Cohn Property <br /> 1 Phase I Investigation Report <br /> Page 4 � <br /> contains high amounts of hydrocarbon Up to several thousand partN per million <br /> 1 gasoline, as well as tens of thousands of parts per billion additives were detected <br /> Oxygenates such as MTBE and its associated compounds do not appear to be <br /> 1 present <br /> Concentrations of hydrocarbon contaminates appear to decrease in the sand unit at <br />' 53 5 to 66 5, and in the underlying clay unit Concentrations of cortaminate-, appear <br /> to lessen with depth at this site It is possible that contaminates may not have <br /> reached the water table at this site However, additional drilling will be neces,,ary to <br />' determine this with certainty <br />' 4.0 Conclusions and Recommendations <br /> 41 Conclusions <br />' Conclusions regarding aeric, extent and death of ails contaminatLon at this >ite car <br /> not be made with the .ata at hand It is alio impossible to determine if groi,nd water <br />' contamination has Occur.-Pd or if it +5 p-Lsert, the attendant risk to health and safety <br /> 4.2 Recommendations <br /> I• if San Joaquin County Environmen*al I-lealtii deems it i;e--essais due to the above <br /> mentioned uncertainties, we recommend a :I,ased pro4i am to detei mine if th-e LST <br />' leak at this site po,es a threat to publiv, health. aiid s afet v It ,5 our opinion that trio <br /> following would be the most cost effective method of as-,e,siin, t ie threa at this sale <br /> Phase 1 <br /> 1 Obtain and inspect log of the aomestic tivater,k ell -t ti.!;� ;ite <br /> 2 Locate other water wells within 1i4 mile racats of site <br /> 3 Sample the domest,c well <br /> 4 If well samples clean, assess threat to weLl based on oepih of-producing aquifer, <br /> I surface seal depth of well, etc <br /> 5 Present findings tnforinally to county heaith department to determine if RBC a <br /> closure inig<t be po,sible with mtnirr al adttition=il subsurface iw e,tig,aion <br /> If well samples show contamination, or if a threat ro the well aught be present, <br /> proceed to Phase 2 <br /> IPhase 2 <br /> 1 Conduct standard site characterization program to determine aerial and depth <br /> ettent of contamination in coils :nd extent of possible phime in ground <br /> . water (additional borings, monitor wells etc ) <br /> 2 Formulate Remedial Action Plan based on above <br /> I <br /> I <br />