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I I 4.0 SOIL DISPOSAL On December 20, 1993, 12 drums of soil were removed from the site and transported across the street to 742 Rose Marie Lane The drums contained auger returns from borings 133 through B7 Analytical results from B3 and 135 through B7 had previously indicated that soil from these borings was not contaminated, and this soil was spread evenly over the back yard of the residence at 742 Rose Marie Lane Contaminated soil from B1, B2, and the Iexploratory trench remains drummed at the site In the first quarter of 1994, GeoAudit will request permission from the San Joaquin Valley Air Quality Management District to aerate this soil at 742 Rose Marie Lane 5.0 WATER DISPOSAL IIn September, 1993, analytical results of water samples collected during previous quarterly monitoring events at the site were transmitted to Mr Larry Williams at the City of Stockton Department of Municipal Utilities A request to dispose of the drummed water in the city sewer was made at that time Subsequently, Mr Williams required GeoAudit to analyze the drummed water for other volatile and semi-volatile hydrocarbons in accordance with EPA methods 624 and 625 Samples were collected from two drums on October 25, 1993 and transmitted to Zymax Envirotechnology for analysis The samples were analyzed by gas chromatograph/mass spectrometer One sample was reported as non-detect for all target analytes, the other sample was non-detect for all analytes except chloroform (1 9 ppb) and 1,1-Dichloroethane (2 0 ppb) The analytical results are included in Attachment B Based on these results, permission to dispose of the water was granted on December 13, 1993 An attempt was made to dispose of the water on December 20, 1993 However, a sewer clean-out could not be located on the site at that time, and assistance in locating a suitable Idisposal point has been made to the City 6.0 VAPOR EXTRACTION TEST A vapor extraction feasibility pilot test was conducted at the site on December 21, 1993 An I Environmental Techniques Vaclean 1000 vapor extraction system, consisting of a Ford Motors 300 cubic-inch internal-combustion engine and a vacuum blower, were connected to vadose-zone well VW-1 with 4-mch PVC schedule 40 pipe Two in-hne Magnehelic gauges were used to monitor the vacuum pressure in the line, and a 55-gallon drum was connected ahead of the blo*er to separate hquids Fromm Vapors 111ropane was used as a supplemental fuel source, and valves in the piping system were used to regulate the I propane, an, and well vapors to attain steady, efficient combustion of extracted hydrocarbons The system was operated for approximately S hours During that time, a Flame ionization Detector (Sensidyne model 7012111M calibrated to methane) was used Ito monitoi exti acted vapor concentrations at half-hour intervals, and three vapor samples were collected in tedlai bags Vapor samples were transmitted to WEST Laboratories for 0-1"—1 Audra S,ry Inv ^ L!/l2 714llArm TUo.M.r� G I