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y NEERING s � <br /> April 25, 198$ . <br /> Desert Petroleum <br /> .. .InC.. <br /> P.O. -Box 1601 <br /> 3 Oxnard' CA 93032 <br /> . <br /> Re. Sts 1 #787 <br /> t «! <br /> 950 llt h St1 <br /> Trac gS 76 <br /> . . OA 3 - <br /> i Attention: Mr. John':.Rutherford * <br /> ircinmental. Dept.. <br /> This'letter is, 3n regard ; to ©ur conversation 'on April 22;-,1988, E <br /> as to the g''.:Environmental Assessttconcernin the. abgve r•:a' <br /> .;.: referenced station, located in Tracy" C79.. Walton Engineering <br /> wi-11 be contracted,:,; nconjunction with Western. Geo-Engineers:to T, r <br /> perform the first phase o#.evaluation busing requested.by the Sea ' <br /> f Joaquin'County, Hay.ironmeotal Health Department.. <br /> it -is' our .understanding that contamination ,was discovered an <br /> April 20, 1988, after the three (3) gasoline pioduct. taaks were <br /> excavated and remaOed: a taaken <br /> in the tank hole' <br /> ` s'no : �a same whether. <br /> t -inter er at 'r0" feet is a perch table,or a lard;'. ' <br /> s volume aquifer. further assessment must be made to` determine-the': 4 <br /> characterixation of this underlying contehinatign k�eneath :th <br /> property. y <br /> . <br /> Walton Engineering proposes.to evaluate this, site on. a Step ss <br /> Approach.. t, <br /> Phase 1: Desert Petro will begin pumping;weter;,'from the`ppen <br /> tank_hole through a°`well installed at :the corner of the ' <br /> excavation. By doing thi operation it will determine.whe .'.the. <br /> recharge capabf i it es arc' on the ta�ik bole`well:. Ai'tor a period <br /> of.time.water well' :;samples ,wi11 be field, screened to see if <br /> . dissolved product[still exists: If field screen method :$bows..: <br /> clean, semples•:`will,be.-obtained ,dor certified' lab,a?a►1YSISs 'our <br /> next ,operation-:wiil,be to;-obtaia, monitoring well permits: fres Seur ,„ <br /> Joaquin County,.. Envizonmantal Health Dept:,:. and... <br /> to schedule .the 4 w <br /> placement of (3) three monitoring welts on :the site,(See` <br /> � f <br /> attaQhu�ent` A nWe <br /> T:. .. <br /> +. . It is our_opinion 1;iw►t ,the mcg toring .wells. are. i�eaessery to <br /> determ3neA i# pro$uct:recovery through. tow tacik hole well is <br /> making an: effect oa the out,: surrounding` the eppavation <br /> Also by installing the wells 'it.will allow on=gong monitoring of <br /> water gradients`and.tperiodic sampUng, to show an effects on,the <br /> site. 7 7.79 <br /> r — r 3 <br /> i <br /> } <br /> . E97 Rs list lane,West Sacrome"# ,itA'99691 -(914)-33if <br />