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ie <br /> gg <br />�.TrS <br /> A. TEICHERT 6 SON <br /> soil-Groundwater Assessment <br /> 103 North E Street <br /> Stockton, California APR 2 2 `71 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> This report is a summary of work completed and in progress to <br /> April 1, 1991, at this site relating to hydrocarbon clean-up. <br /> Tank Removal <br /> Two (2) underground gasoline tanks and one (1) waste oil <br /> tank were removed in the fall of 1988. One (1) additional diesel <br /> tank was removed in the summer of 1988. <br /> Hydrocarbon contamination was di3covered with the removal of <br /> the two gasoline tanks. J.H. Kleinfelder's "Soil and Groundwater <br /> Assessment" dated April 27, 3987, concluded that approximately <br /> 1,000 cubic yards of soil was contaminated with an estimated <br /> 1,700 gallons of hydrocarbons mostly associated with the piping <br /> leaks rather than tank leakage. <br /> There was minor contamination around the fill of the tank <br /> removed in the summer of 1988 and this contamination was removed <br /> prior to backfilling. Excavation and aeration of the 1,000 cubic <br /> yards started September 15, 1987 and area approximately 38 feet <br /> by 47 feet was excavated to a depth of 38 feet and 1,700+ cubic <br /> �f� ,�: yards of soil were removed for aeration on site. Aeration on <br /> i� site has been completed and soil removed. <br /> Monitor Well <br /> Monitor Wells 1 and 2installed by Klienfelder were <br /> destroyed during excavation of the site. Monito..r: We.11 3 still <br /> exists but. is only about 35:... feet deep and, : _is dry3 The` <br /> ,. groundwater is about 70 feet deep as,,,sgeasured in March;1991 <br /> Monitor <br /> 'a 11 a and 5 installeid- by L.B.M.c. - Corp. stili <br /> a1 <br /> exist. They ara about 50 feet deep a�, d are dry. <br /> Monitor Wolls , 9, 10, and 11 werik.drilled.. in March 1990 to' <br /> deptbu of approximately 90'feet-and into. 30+'`feet of water". <br /> ~ 1 <br />