ARCHIVED REPORTS XR0001668 - Laserfiche WebLink

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T a On February 2, 1994, approximately 90 DOT drums containing soil cuttings and purge water were treated with a bacterial inoculum The drums represented an accumulation of soil cuttings and purge water from monitoring well installations and samplings over the past few years The lid for each drum was removed and the bacterial inoculum was placed directly onto the contents of each drum After inoculation was completed, each lid was replaced On June 21, 1994, water samples were collected from five inoculated drums The samples were transported-to a state-certified laboratory and composited for analysis No petroleum hydrocarbons were detected in the composite water sample from the treated drums On June 22, 1994, three soil samples were collected from drums containing soil cuttings The samples were transported to a state-certified laboratory and composited for analysis TPH as gasoline was detected in the composite soil sample at 3 1 ppm, no BTE&X were detected in the soil sample Results of the drum treatment provided encouraging results for the treatment of both hydrocarbon impacted soil and groundwater Based upon the results of the pilot study and the drum treatment, a full-scale soil inoculation was initiated in August 1994 3.0 PROCEDURES 3.1 Aquifer Testing Between July 13 and 15, 1994, a series of aquifer tests were performed at the site Two slug tests were performed on monitoring well MVV-13, a step test was performed on «ell EW-1. and a pumping test was performed on well EW-1 "ith drawdown measured in surrounding wells The procedures, results and conclusions of the aquifer testing is detailed in Appendix A 32 Bioremediation Inoculation On August 16, 1994, full-scale inoculation of the site was initiated At that time, approximately 1,200 gallons of inoculum were introduced into wells on-site A total of nine monitoring wells, one extraction well and six remediation wells were inoculated The volume of inoculum placed into each well is included in Appendix B Both soil and groundwater were inoculated during the full scale inoculation Packers were Used in several wells to allow the direction of inoculum into specific zones The packers used were non-pneumatic because a 100 percent seal was not necessary The inoculation was viewed by Mr Harlin Knoll of the San Joaquin County Public Health Services - Environmental Health Division (PHS/EHD) ca<a.r-i ti.a1 S.,-r&la o+.,k0y R"ns An-1s cewoms