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Elizabeth Thayer <br /> August 21, 1995 <br /> Page 2 <br /> demonstrated that the petroleum hydrocarbons had only limited migration potential in Site <br /> soil. Over a 99-year period, tetradecane, used as a conservative surrogate chemical, <br /> migrated less than one foot. ChemRisk concluded that the petroleum hydrocarbons will not <br /> impact the groundwater beneath the Site Therefore, there were no complete exposure <br /> pathways at the Site. <br /> It was recommended that the petroleum hydrocarbons present m soil beneath the Santa Fe <br /> Railway Site could safely remain in place because they do not pose a threat to either <br /> groundwater resources or human populations <br /> In early 1994, the SJCDEH submitted the Risk Assessment with a recommendation for <br /> closure to the CRWQCB. The CRWQCB reviewed the Risk Assessment but would not <br /> grant closure until certain information had been provided and a Closure Plan had been <br /> submitted according to their specifications. In October of 1994, ChemRisk submitted a <br /> closure plan and a case closure checklist to the CRWQCB for the site on behalf of Del <br /> Monte Corporation (a former owner of the site) <br /> CRWQCB also requested information about the results of quarterly groundwater <br /> monitoring Up until that time, seven groundwater monitoring events had been conducted <br /> by ERM-West, the consultant for Santa Fe Railway (the current owner of the site), with the <br /> most recent in May of 1993 A summary of the previous investigations is presented as <br /> Attachment A <br /> SUMMARY OF RECENT INVESTIGATIONS <br /> We understand that you requested current groundwater monitoring results due to concern <br /> about potential impact of rainfall during the last rainy season. In light of your request, <br /> which was related to Santa Fe, ERM-West has resumed quarterly groundwater monitoring <br /> activities. To date, two groundwater monitoring events have been conducted. The letter <br /> reports prepared by ERM-West and the corresponding analytical results for these two <br /> investigations are included as Attachments B and C A summary of these two investigations <br /> is included in Attachment A referenced above <br /> According to the April 1995 ERM-West report, the first sampling event (March 1995) did <br /> not identify any detectable concentrations of total petroleum hydrocarbons (TPH) as diesel <br /> or gasoline or benzene, toluene, ethylbenzene, and xylene (BTEX) in MW-1 and MW-2. <br /> However, the laboratory reported 84 ug/L of TPH as an unidentified hydrocarbon in the <br /> Q <br /> e\€\aL1cnMn0e019%0011rw9ceaw sm <br /> A Divisron of McLaren/Hart <br /> Environmental Engineering <br /> Qa�ecxhalas, <br />