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WEGE PROTECT. REGAL 603 <br /> 2-10-89 <br /> 23 WELL RECONNAISSANCE <br /> A reconnaissance of all wells within a one mile radius of the site was <br /> undertaken by WEGE This reconnaissance was performed by reviewing the <br /> State Department of Water Resources well files and visual inspections near <br /> the site (see figure 11, tables 4 and 5). <br /> The ground water sampled from monitor wells at this site is in the uppermost <br /> (shallowest) aquifer of a flood basin and/or alluvium fan deposit and is most <br /> likely associated with the Victor formation. Due to the limited thickness of <br /> this and the younger overlaying formations most wells in the area produce <br /> their water from deeper sources (Laguna and Mehrten formations). <br /> The quality of the different aquifers situated in the Stockton area is <br /> depended upon several factors: <br /> A. The area of recharge. <br /> B. Time,length and route of water migration. <br /> C. The quality of the overlaying aquifer. <br /> D. Man made obstructions, such as wells, drainages, etc. <br /> There are no true aquitards within the Stockton area that have shown the <br /> capabilty to block the downward movement of ground water from one <br /> aquifer (sand/gravel formation) to the next. An overdraft situation in this <br /> area has inhaaced this downward migration and is associated with the steady <br /> decrease in ground water quality due to the intension of the poor quality <br /> water of the Delta infikra- the various shallow aquifers. <br /> Ground water in the Stockton area is suitable for domestic, industrial and <br /> agricultural usage. The shallow aquifers, similar to the one in which the <br /> monitor wells are developed in at this site, ate basically used for privately <br /> owned small volume irrigation wells. Deeper wells are needed to guarantee <br /> water available for domestic, municipal.industrial and agricultural purposes. <br /> 2-4 CONCLUSIONS <br /> Soil samples obtained during the excavation and removal of the old <br /> underground fuel storage tanks revealed that the subsurface was <br /> contaminated with gasoline range hydrocarbons. Exploratory borings <br /> performed on site indicate that the soil contamination extends vertically to <br /> the shallow ground water found at approximately 50 feet below the surface <br /> and laterally does not exceed the extent of the excavation (see figures <br /> 12a-12e and 13). The excavation was extended to approximately 23 feet <br /> below the surface and produced an estimated 650 cubic yards of soil. This <br /> was aerated on site and then removed once sample results showed it to be <br /> 23. <br />