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Chevron U SA <br /> Page 11 <br /> The results of those analyses showed that a portion of the samples were not <br /> thoroughly aerated It was concluded that the tilling operation should continue for <br /> approximately 5 days for each lift of hydrocarbon-contanunated soil This sequence <br /> commenced on August 28, 1990 On August 29, 1990, California Petroleum Inc , the <br /> contractor performing the earthwork, requested that each of the stockpiles storing the <br /> hydrocarbon-contaminated soils be spread in one thick lift around the excavation near <br /> the center of the site It was felt the tilling activity could be more efficient if <br /> the soils were placed around the excavation, eliminating U-turns and wasted motion in <br /> the tilling process. The San Joaquin County Health Department approved this process <br /> The top and middle photos found on Plate 2, show the mounded contaminated soils before <br /> and after all stockpiled soils had been spread <br /> On August 29, 1990, a dust complaint was received by the San Joaquin County <br /> Health Department from neighboring residences From this point forward, California <br /> Petroleum Construction Company made an additional effort to minimize dust by ceasing <br /> operations dunng portions of the day when wind was a factor and by placing the <br /> stockpile of cleansed soil at a location to help block the movement of dust between <br /> the subject site and neighboring residences <br /> 16000-250-044 <br /> D\\IEs & MOORE <br />