Laserfiche WebLink
lI� <br /> Engineering, Inc. <br /> Mr. Michael hifurna <br /> Safi Joaquin County Public`Hea <br /> a Services <br /> Env ir en J16 D3 vWon <br /> 304 East:Weber Avenue;Third Floor <br /> Stockton.California .95,202 <br /> subject Door_-to-Door Well Survey <br /> Former Ex-kou Retail 5fte:7 3708, Club'Boulevard,Stockton,CA` <br /> Dear Mr:Infutra: <br /> AS directed by xxxonll obit Refi ivag acrd supply Company(Exxon obil},ETI C) ngit eeriAg, . <br /> (EVC)has rBci't letter rpt docuineirt g the results of a doter<to�Ooor well surrey for the <br /> above re*reneed site(Figur 1}, 'The well survey w `:conducted by ETIC b on:discussions <br /> ween ETIC and yrxir office: <br /> 'MC pose of the well survey was;to ide tfify ppte>2tial:.offsite receptors , yx serve as potential <br /> pa for gcttundwter undcyixig'ie site and vicinity. dc�tsr-Fto-dcior well survey was . <br /> ccticted fot. e residential area and co>Etieiial area nearthe site In an attempt to quagtfy;an <br /> appropriate radius"of intluet the foWWing seepagOvetocity equation was used <br /> ` i=I6/nti..: seepe velocity-Where. (ft/yr) <br /> ` <br /> I <br /> I `=hydrraulic conductivity,(It/yr}- <br /> i =by tdie:gridient <br /> VIC e€fective porosity, <br /> ETIC jrview6d bioiuig for the sia}e.and found.that for the silt and pt> rly I sand unfer ` <br /> at the site;t � >hy uhc t uefivity is�likely 10 3 ntimetOrs` k,cm/s}. Using, <br /> the hydraulic <br /> con, cif f `3in7s ,br 1034 fcef er <br /> f_ s: _ � yr} l# it es a cons;ervitive- <br /> estitrim e.The historical hytirai�ltc g ienf if thesite lids ranged,from xiinately 0,(}.01 to fl W3. <br /> A hyt au is g eJ�E oto. 003 was its iii- oalculat an .re re eats a conservative:estimate in <br /> fhb cakuiatnon of the radius,of imT wce for the well.suty y, The eir'ect ve soil porosity for the <br /> geologic materials of the site i<s a iziiated to vary between 3°K and 5T1,x.-,,Fer,e purse of this <br /> seepage velocity calculafioi,art eecfive parosit�r of 35e1�: vas used.: <br /> sJ #he panes reported.above,Elie ealeulsted image velocity_ is 8$56#fi/yr This annual rate <br /> vvtlieri inultipIied by 10years,which is the length of time froim the initial investigation®f 1991 <br /> fo the <br /> present. Records4af the inYflal;unauthorized Tease form were uitavt ilable: Hese calculations <br /> `rest in a radius of alsgr«�ximatly 89 feet for 10 ears of. ` <br /> y grow dwatJer travel time. To add a factor <br /> of safety to this distance, A radirus of approximately 800 feet from the property was used to identify <br /> properties for the well si urrvey. <br /> 2285 Morelto Ave:. Pleasant HILI,CAW23• Phone:925.602.4710• Eax:925:602.472Q• License No.624022 <br />