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aqua science ,. = _ -� engineers Inc. Januaiy 25 2002 Ms Anita Cassidy 625 El Pot tal Avenue Manteca CA 95337 SUBJECT INSTALLATION OF A DOMESTIC WELLHEAD TREATMENT SYSTEM, CASSIDY PROPERTY 17926/17928 AIRPORT WAY MANTECA, CA Fi ank s One Stop 2072 West Yosemite Avenue Manteca California INTRODIJCTIO On Octobei 23, 2001, the San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) sent you a letter stating that a domestic wellhead treatment system would be installed on your propel ty's well, by Aqua Science Engineet s (ASE) as a mote p e i m a n e n t solution to providing MTBE-tree water to the house's plumbing ,ystem A copy of this letter i�, included as Appendix A WELLHEAD IREATMENT SYSTEM DESIGN AND INSTALLATIO On Decembet 12 and 13, 2001 ASE installed a wellhead treatment system on the well located at 17926/28 Airport Way to remediate low MTBE concentrations previously identified in that well This well supplies watei to the t,,� o houses at the pi opei ty The wellhead treatment system consists of the existing well pump a n d holding tank, which is then plumbed to two 250 pound ai anu lated activated carbon (GAC) canisters piped in Series UntieatedL water is removed tion the %kell and stoied to the existing holding tank Untieated water leaves the holding tank and enters the GAC canisters pi ioi t o entet ing the plumbing system loi the iesidences on the pi open ty Each o i the GAC canisters is filled with 250 pounds of virgin 1200 mesh activated carbon The activated carbon is used as a media tot the MTBE molecules to adsorb onto Watei lea',rnQ the canisters is then free of MTBE At the point in time when the activated carbon can no longei adsorb the MTBE - t - IF �v Ff Pit)�c Dcovillr, .�ct a,mo 9A526 • -2,5 820 Qj�� Fax 025 8� 5 3