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I <br /> i . <br /> AiGTORI <br /> NGINElERING <br /> si <br /> April 25, 1988 <br /> I <br /> Desert Petroleum, Inc. <br /> p.0. Box 1601 <br /> Oxnard, CA 93032 <br /> I <br /> Re: Station #787 <br /> 950 lith St. <br /> Tracy, CA 95376 <br /> Attention: W. .John Rutherford <br /> ental Dept. <br /> t.p <br /> This letter is in regards to our conversation on April 22, 1968., <br /> as to the Environmental Assessm+ t concerning the above <br /> referenced station, located in cy, CA. Walton Engineering - <br /> will be contracted, inconjuncti.,n with western Geo-Engineers to <br /> se of evaluation being requested by the San <br /> perform the first pha <br /> Joaquin County, Environmental Health Department. <br /> e It is our understanding that contamination-was discovered on <br /> r=: <br /> April 20, 1988, after the three (3) gasoline product tar <br /> were <br /> excavated and removed. Soil and Groundwater same es were <br /> taken <br /> led dissolved gasoline ine <br /> in the tank hole area, which revea <br /> constituents in the water. It is not knov"at this tim whether <br /> the water encountered at 15,-0,, feet is a perch table or a large <br /> I vol►ane aquifer. Further assessment must be made to determine the <br /> characterization of this underlying contamination beneath this <br /> property. <br /> Walton Engineering proposes to evaluate this site on a Step Phase <br /> Approach. <br /> phase 1: Desert Petroleum will begin pumping water from the open <br /> tank hole through a well installed at the corner of the <br /> xcavation. By doing this operation it will determine what the <br /> e <br /> xcavage capabilities are on the tank hole well. After a period <br /> recharof time 'water well sraiples will be field screened to see if <br /> dissolved product :.till exists. If field screen method shows <br /> clean, samples will be obtained for certified lab analysis. Ouir <br /> next operation will be to obtain monitoring well <br /> tOschedurmits frole theSan t <br /> Joaquin County, Environmental Health Dept., <br /> and placement of (3) three monitoring wells on the site.(See <br /> attachment A, "Wegeop) <br /> It is our opinion that the monitoring wells are necessary to <br /> determine if product recovery through the tank hole well is <br /> making an effect oq the out areas surrounding the excavation. <br /> Also by installing the wells it will allow on going monitoring of F <br /> w--er gradients and periodic sar:,?ling, to show ar, effects on c?le <br /> ;- site. <br /> i '1 k tiler• lnn: Wr51 4 irrr� n •nen CA 95694 14161119-1RHH <br /> 1 <br /> .y <br /> a <br />