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• <br /> DEPTH IQ GROUNDWATER & LOCATION,.,DF WELLS: <br /> According to maps published by the County Flood Control District, <br /> groundwater is influenced by tidal action, and ranges from 5 to <br /> 10 feet below ground level. Water did not enter the excavation <br /> which was about 10' deep after removal of the UST. However, <br /> during reexcavation of the site in April, 1993, the water table <br /> was found at a depth of 7 feet, and remained fairly constant <br /> during the work. PLATE ID shows depth to groundwater, sea level <br /> datum, in the Spring of 1986, the highest recorded levels during <br /> the past 10 years. However, it is most likely that the water <br /> table in the Port area fluctuates with tidal forces, which may <br /> vary by 5 or 6 feet. It has been reported that there are several <br /> groundwater monitoring wells in the area, but none are considered <br /> to be in the zone of influence of this location. <br /> PRIOR USE OF REMOVED_DST: <br /> PLATE V is a generalized map of the property showing the location <br /> of the DST in relation to other features. The tank was used to <br /> fuel company vehicles and other equipment. It had been tested <br /> • for integrity in September, 1990, and was shown to be tight. It <br /> was in good condition when removed. The associated piping and <br /> fuel dispenser did not show any evidence of leaks or severe <br /> corrosion. Refer to prior reports for copies of the tank <br /> disposition tracking records tank tightness test records <br /> BRIEF REVIEW OF PRIOR WORK: <br /> November 2. 1992 - A 1, 000 gallon UST, dispensing pump and <br /> associated piping were removed from the property by Jim Thorpe <br /> Oil personel. Soil samples taken from beneath the removed tank <br /> were below detection limits, (refer to TABLE I for the results of <br /> those tests. ) A small amount of apparent contamination was noted <br /> on the north wall of the excavation. <br /> Ngvember 25, 1992 - The site was reentered to remove additional <br /> spoil from the north wall. Two (2) soil samples were taken; one <br /> of which revealed a minor amount of Toluene_ TAB <br /> IAF_ I! summarizes <br /> the results of laboratory analysis of those samples. <br /> Fgbruary 11 , 1993 - A workplan was prepared by Wm. J. Hunter & <br /> Associates, (WJH, ) to reenter the site and remove additional <br /> spoil. A copy of that workplan, (w/o attachments, ) is included <br /> as MJBIT A. <br />. —April 6 1993 -- The site was again reentered to remove the <br /> 3 <br />