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aqua science . MWTI = . engineers inc� January 29, 2002 Mi Robert Mack 17821 Ari poi t Way Manteca, CA 95337 SUBJECT INSTALLATION OF A DOMESTIC WELLHEAD TREATMENT SYSTEM, MACK PROPERTY 17821 -kIRPORT WAY, MANTECA, CA In ja,-Li ence to. Fiank s One Stop 2072 West Yosemite Avenue Manteca, California INTRODUCTION On Octobei 23 2001 the San Joaquin County Public Health Services . Enviionmental Health Division (PHS/EHD) sent you a letter Stating that a domestic wellhead treatment System would be installed on your pi opei ty's well by Aqua Science Engineers (ASE), as a moi e permanent solution to providing MTBE-flee ,nater to the house's plumbing system A copy of this letter is included as Appendix A WELLHEAD TREAIMENTSYSTEM-DESIGN AND INSTALLATIO On January 9 and 10, 2002 ASE installed a wellhead treatment system on the well located at 17821 Airpoit Way to remediate low MTBE concentrations pic\ iously identified in that well This well Supplies water to the residents at the pi opei ty The wellhead ti eatment System consists of the existing well pump a n d holding tank, which is then plumbed to three 250 poundgi anulated activated carbon (GAC) canisters piped in Serres Untreated water is removed from the well and stored n the existing holding tank Untreated water leave,, the holding lank and enters the GAC canisters pt for to entering the plumbing system for the ie,,idence,, on the property Each of the GAC cant,,tei,, t,, tilled with 250 pound,, of virgin 1200 me,,h activated c,aibon The activated carbon is used a,, a media loi the MTBE molecules to adsorb onto Watet leaving the canisters i,, then free of MTBE At the Point rn time when the activated carbon can no longer adsorb the MTBE - i - 2U3 t}1 ti reins n Orwille C( , Owio 94520 e X258209;c-'1 - In, 92533.-- 8-53