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ry y A <br /> _ �wh <br /> ' ALTON <br /> [ , ENGINEERING <br /> April 25, 1988 <br /> Desert Petroleum, Inc. <br /> P.O. Box 1601 <br /> Oxnard, CA 93032 <br /> Re: Station #787 <br /> 959 11th St. <br /> Tracy, CA 95376 <br /> Attention: Mr. John Rutherford <br /> Ebvirorunental Dept. <br /> This letter is in regards to our conversation on Apri3'22, 1988, <br /> as to the Environmental Assessment concerning the above <br /> referenced station, located in Tracy, CA. Walton Engineering • <br /> will be contracted, inconjunction with Western Geo-Engineers to <br /> perform the first phase of evaluation being' requested by the San <br /> Joaquin County, Environmental Health Department. <br /> It is our understanding that contamination was discovered on <br /> April 20, 1988, after the.tbree (3) gasoline product tanks were <br /> excavated and removed Soil and Groundwater.�mples were taken <br /> in the tank hole area, which revealed dissolved gasoline <br /> constituents in the water. It is not knomat this time whether , <br /> the water encountered at 15'-0" feet is,a perch table or a large;' <br /> } volume aquifer. Further assessment must be made to determine the <br /> s 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 Petroleem will begin pumping water from the open <br /> tank hole through a well installed.at the corner of the <br /> excavation. By doing this operation it will determine what the , <br /> rechargecapabilities are.on the tank hole well: . After a period <br /> of time water well samples will be field screened to see if <br /> dissolvedproduct:still exists. If field screen method shows ' <br /> clean, samples will be obtained for certified lab analysis. Our <br /> next operation will be to obtain monitoring well permits from San <br /> Joaquin county, Environmental Health Dept., and to schedule the 1. <br /> placement of. (3) three monitoring wells on the site.(See <br /> - - - attachment-A, Wege )-- ---- ------ --- - - -- - - - - <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 on the out areas surrounding the excavation. <br /> Also by installing the wells it will allow on going monitoring of <br /> water gradients and periodic sampling, to show an effects on the <br /> site. <br /> ,. _ _ R7%Rieke Lnnc•_W,s[Sormm,mti CA 95191 1911,1 379•INRH - - <br />