Laserfiche WebLink
6 �A <br /> • ERI 205543ER L46 Tosco 7G Service Station 58$6 Stockton California <br /> March 28 2001 <br /> MTBE concentrations in water samples collected from the UST cavity well and well MW3 are shown <br /> on the Concentration vs Time Graph (Graph 1) The laboratory analysis reports and Chain of Custody <br /> records are provided in Attachment B <br /> Selected water samples were also analyzed for the 17 California Assessment Metals (17-CAM metals), <br /> total cyanide, sulfide, reactivity, corrosivity, and ignitability for disposal profiling at the Tosco <br /> Refinery The results of laboratory analysis of these elements/compounds are provided in <br /> Attachment B <br /> Using the results of laboratory analysis for the samples collected from the purged groundwater, ERT <br /> calculated that approximately 14 pounds of MTBE were removed from beneath the subject site during <br /> the three purging events A summary of the amount of MTBE removed is provided in Table 2 The <br /> MTBE removal data are also shown on Graph 2 Due to the elevated detection limits of the remaining <br /> hydrocarbon compounds, ERI did not calculate the total mass removed of these other constituents <br /> ERI recommends continuing weekly purging of the UST cavity well and well MW3 and collecting <br /> monthly water samples from wells MW2 and MW3 for six consecutive months to evaluate the effect of <br /> weekly groundwater purging on concentrations of dissolved hydrocarbons in the vicinity of the UST <br /> cavity <br /> Please call Mr Glenn Matteucci, ERI's project manager for the site, at (415) 382-5994 if you have <br /> questions regarding this letter <br /> • Sincerely, <br /> Environmental Resolutions, Inc <br /> &UA L4 <br /> ED G�O� Robert A Saur <br /> Staff Geologist <br /> o 4313 <br /> Oohn B Bobbitt <br /> Q� R G 4313 <br /> 2 <br />