COMPLIANCE INFO 1987-2003 - Laserfiche WebLink

Home Browse Search

tPhase II Hazardous Materials Study for the Lodi RaibMultimodal Station July 24, 1997 to Wilbur Smith Associates Project No. E168 ' Several methodologies were used to locate unknown underground storage tanks, sumps, etc. that may remain on the site. Only the waste oil tank at Station 2, oil/water separators at Stations 1 and 3, and ' the abandoned tank at Station 3 were identified. If underground storage tanks are still present at any of the 3 gas station sites it appears that they may ' be under the planter, sidewalk, or streets bordering the site. This appears to be unlikely at the Station 2 or 3 sites since Mr. Thorpe indicated that he had removed tanks at Station 2 and further exploration by the City of Lodi at that Station 3 identified a single previously abandoned tank. ' The possibility that underground storage tanks still exist in the planter, sidewalk, or street areas (presumably City of Lodi right-of-way) adjacent to the three station sites can not be completely eliminated. However, our drilling, trenching, and sampling program suggest that if tanks were or are ' currently present on or adjacent to the site, significant releases of product have probably not occurred. A level of 1.5 ppm TPHd was indicated in a soil sample from Boring B3 at a depth of approximately ' 15.5 feet. This value, if not in error, may indicate low levels of diesel from a relatively nearby source (within several hundred feet). If a source is present we would suspect it to be to the northwest, north, or northeast(probably off-site considering that the boring was near the northern site ' boundary) since hydrocarbons were not identified in any of our other borings or trenches within the site. It is also possible that the value has resulted from some other naturally occurring organic materials are creating the low value obtained. ' RECOMMENDATIONS The two oil/water separators should have the contaminated soil removed from the basins and the piping should be properly abandoned. The soil should be characterized and removed from the site. The quantity of soil to be removed will probably be less than 1/2 cubic yard. ' The City of Lodi will need to provide the San Joaquin County, Environmental Health Division, with the appropriate information to comply with their Abandoned Tank Policy. This policy includes a plot ' plan and requires a signed statement by the property owner or other evidence (i.e. materials receipts or Fire Department Permit) showing that the tank was abandoned prior to July 1, 1984. It is our understanding that the City of Lodi will be submitting these documents to the Environmental Health Division. ' Removal of the waste oil tank by Union Pacific Railroad should be followed-up to verify that the Environmental Health Division has closed this tank site. The low level of diesel found in Boring B3 does not necessarily require further action; however, it could be an indication of a source in an uninvestigated area. There is some risk that the source could be on-site. If it is desired to reduce this risk, we could complete further evaluation in the area of Boring B3. ' The drill cuttings found on-site in the 55-gallon steel drums can be disposed of at approved locations either on-site or off-site. Laboratory analyses do not indicate contamination of any of the soil ' cuttings. ' 9 ' V ESPANA GEOTECHNICAL CONSULTING