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CONSTRUCTION OF SOIL AERATION CELL <br /> On December 2, 1996, Smith Technology personnel began the construction of a soil aeration cell <br /> in accordance with a letter workplan submitted to PHS/EHD and an authority to construct issued <br /> by the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) Approximately <br /> 1,200 cubic yards of stockpiled soil was placed on visquene plastic, with a maximum soil height of <br /> three feet, to promote aeration of the hydrocarbon impacted soil During the construction of the <br /> soil cell, the soil was monitored with a flame-ionization detector (FID) every hour and a log of the <br /> FID readings was recorded Table 2 summarizes the FID readings observed during the <br /> construction of the soil cell The location of the soil cell is shown on Figure 3 The soil cell will <br /> be sampled during the second quarter of 1997 to monitor the progress of aeration activities Field <br /> notes for the soil cell construction are contained in Attachment 3 <br /> PURGE WATER DISPOSAL <br /> On December 17, 1996, Smith Technology personnel supervised the disposal of 600 gallons of <br /> monitoring well purge water stored onsite The purge water was transported by Asbury <br /> Environmental of Tracy, California to the Demenno/Kerdoon recycling facility in Compton, <br /> Califorrua A copy of the manifest is contained in Attachment 4 Currently there is no purge <br /> water stored onsite <br /> ADDITIONAL SUBSURFACE INVESTIGATION <br /> On November 25, 1996, Smith Technology personnel supervised the advancement of eight soil <br /> borings at the subject site The soil borings were advanced to define the extent of petroleum <br /> hydrocarbon contamination in soil and groundwater in the northern portion of the site Results of <br /> the subsurface investigation will be summarized a forthcoming report <br /> In accordance with PHS/EHD correspondence dated December 27, 1993, the sampling schedule <br /> of MW has been reduced to annually and wells MW5 and MW6 to semi-annually Wells MW2, <br /> MW3 and MW4 will continue to be sampled quarterly Additionally, the nearby community well <br /> will be sampled quarterly This schedule is based upon historical groundwater analytical data <br /> w 1943261quaA1yAgr-1996 doc 3 <br /> • <br /> SK TH <br />