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Union Ice Company, Wever Street <br /> Phase III Site Assessment - Report of Findings <br /> & Phare IV Additional Remedialion Proposal <br /> Page 4 <br /> I contamination (at 12 5 feet deep in BX-3) This is due to the fact that the water table is <br /> slightly artesian No water is encountered in the borings until the Sand 1 unit, which is <br /> the aquifer, is encountered at a depth of 15 feet Water then rises ill the holes until it <br /> reaches its standing level of 10-11 feet <br /> 5 0 RE COMIIEND A.TIONS <br /> Because of the high levels of contamination present in the soil, and the proximity to <br /> groundwater, it is recommended that the contamination be removed This would <br /> probably best be done by excavating the contamination Vapor extraction does not <br /> present a viable option, because of the long time that would likely be necessary to <br /> I remove the hydrocarbons due to the tow permeability of the Clay A unit and increasing <br /> the possibility that groundwater would be impacted <br /> Consequently, we recommend that the contaminated coil be removed by excavation and <br /> that the walls and bottom of the excavation he sampled to insure that all of the contam- <br /> inated soil is removed Samples Neill be analyzed by a State certified moode lab, <br /> Exelchem, which will be on site Additional tramples may be sent to GeoAnalytical <br /> Laboratories in Modesto, California The excavation will then be backfilled with clean <br /> fill material <br /> In a phone conversation with Mare Meat's, of the San Joaquin County Environmental <br /> Health Department on July 1G 1992, WH1� Environmental was infoirtied that the clean <br /> up levels o, the soil would nave to be at a 'non detect" level The soil will be <br /> excavated until an "ND" Ievel is reached in the sidewalls and at the bottom of the exca- <br /> vation <br /> In the event water enters the excavation, water samples will be obtained to determine if <br /> groundwater contamination has occurred If groundwater has been impaced by the <br /> excavation activities, contaminated groundwater will he pumped into "Rain For Rent" <br /> holding tanks that will be brought onto the site Once tiic- water in the excavation is <br /> determined to be an "ND" level, the excavation will be backfilled with clean t=ill <br /> material <br /> I <br />