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Exxon U.S.A. <br /> Page 2 <br /> -Soil sample results from Shell's MW 4 at 29.5 feet bgs evidenced TPH as gasoline at 1.1 ppm. <br /> -Soil sample results from Shell's MW 1, MW 2, and MW 3 evidenced low levels of soil <br /> contamination but no samples were collected below 25 feet of ground surface. <br /> -Shell's four monitoring wells have evidenced low levels of groundwater contamination. <br /> -The highest soil contamination evidenced during the removal of Shell's tanks in June 1990 was in <br /> the area of the unleaded tank and the dispenser island (samples T2S and Tr-2A). Shell does not <br /> have a monitoring well downgradient of these areas. <br /> -Prior to 1965 this area was undeveloped and primarily used for agricultural purposes. The <br /> groundwater level may have been lower at that time due to agricultural well pumping. <br /> -The local gradient has consistently paralleled the regional gradient in a northeasterly direction. <br /> -CVRWQCB made late revisions to Exxon's request for an NPDES permit. One of these <br /> revisions was to conduct a preliminary test of the injection system and install groundwater <br /> monitoring points across Pershing Ave. Exxon stated with these revisions they would probably <br /> remove their NPDES permit request from the June CVRWQCB meeting agenda. <br /> -Groundwater levels are currently rising and Exxon hopes to be able to sample MW 8 in July <br /> 1992. <br /> -CVRWQCB and PHS/EHD concurred that Shell may be required to install an additional <br /> monitoring well downgradient of the area with the highest soil contamination. The soil below first <br /> water should be sampled and analyzed when this well is installed. <br /> After the above information was discussed, it was decided that Shell and Exxon should further research <br /> their site histories and provide this information in their next quarterly report. <br /> Should you have any further questions regarding this matter, please contact Harlin Knoll, Senior REHS, <br /> my staff at (209) 468-3442. <br /> Jogi Khanna, M M.P.H. <br /> Health Offf4 <br /> to A. Cotulla, REHS, Program Manager <br /> n ronmental Health Division <br /> LAC/MC:Ib <br /> c: CVRWQCB - Elizabeth Thayer <br /> c: Aegis Environmental <br /> 1050 Melody Ln, Ste. 160 <br /> Roseville, CA 95678 <br />