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425 North Union Street <br /> Page 2 <br /> On March 2, 1990, a soil sample was collected at 14 feet for analysis of unknown fuels in the <br /> area of tanks #1 and #2 with no contamination detected. On April 20, 1990, the piping ' <br /> associated with former tanks #1 and #2 was removed and three'soil samples were collected with <br /> TPH-diesel detected in one of the piping samples of up to 78 ppm. PHS/EHD indicated that <br /> based on available information, no additional investigation or remediation of contamination <br /> observed associated with former tanks #1 and #2 was necessary. <br /> Summary <br /> Based on the type of groundwater contamination .which is currently observed in monitoring <br /> wells, PHS/EHD requests additional soil investigation to verify that soil contamination does not <br /> exist, associated with former tanks #1 and #2, which may be contributing to the TPH-gas <br /> contamination evidenced. <br /> Also, please note that Table 2 of the quarterly report contained an error in the detection limit for <br /> TPH-oil which was .2 mg/I rather than .5 mg/l. Please make the correction so that subsequent <br /> tables will not reflect this error. <br /> Please submit a work plan to complete the soil investigation requested and the evaluation of the <br /> residual soil contamination evidenced in stockpiled soil located at 1320 West Weber. Hopefully, <br /> sufficient information should be available to evaluate the potential threat/continued <br /> contamination of groundwater necessary for the preparation of a corrective action pian per the <br /> Underground Storage Tank Regulations. <br /> Please contact Mary Meays at (209) 468-0337 to schedule an inspection to observe the next <br /> groundwater sampling event or to answer any questions which may be associated with this <br /> correspondence. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> l <br /> Mary Meays, Senior REHS Diane.M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM1425UNION 3 <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Jeff Lawson, Esq. <br /> cc: Lee Hansen, Arctic Ice <br /> cc: Dennis Green, Esq. <br /> cc: John Farr, ICF Kaiser <br />