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, <br /> t <br /> A. THICHERT SON <br /> Soil-Groundwater AssessmentREL EVO <br /> �L �. <br /> 103 North E Street <br /> Stockton, California APR 2 2 4" 1 <br /> ENVIRONMENTAL HEATH <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 discovered with the removal of <br /> tha two gasoline' tanks. J.H. Kleinfelder°s "Soil and Groundwater <br /> Assessment" dated April 27, 1987, concluded that approximately <br /> 1,000 cubic yards of soil was contaminated with an estimated <br /> 1,704 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 /> removee,_ 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 /> yards of soil were removed for aeration on site. Aeration on <br /> site has been completed and soil removed. <br /> I Monitor Well <br /> Monitor Wells 1 and 2 installed by Klienfelder were <br /> destroyed during excavation of. the . site. .Monitor 1Pel1: 3s still <br /> exists but is only . about ndhg <br /> y5 feet _ deep. a ';;�is adry: >7° <br /> gropndwatar8. about 70 'feat deep as,;meaeu.ed 'in 14arch.--19911 <br /> 16hitokL,Vell's . 4 and ,S installed- ,by L.B.M.C. • Corp. still <br /> exist. They,are �alyout 50 feet deep and._are _drys, <br /> _. <br /> . - �.r. 4 - <br /> debt_ Moni_ Well�; 9r .;IO, and 11 were,driia.ed in. Max h� 1990„to, <br /> ,. <br /> hs:q approximat -'.,90`-feet .and .into-"3G± feet of i�nte1z. <br /> 1 <br /> r <br /> t <br />