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aqua science -� -, engineers irtc � ir _ � � l January 28, 2002 Ms Karin Meyer 370 N Main Street Manteca, CA 95336 SUBJECT INSTALLATION OF A DOMESTIC WELLHEAD TREATMENT SYSTEM, MEYER PROPERTY 17911 AIRPORT WAY, MANTECA, CA In i eference to, Fi ank's One Stop 2072 West Yosemite Avenue Manteca, California INTR_ODUCTION On October 23, 2001, the San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) Sent you a lettei stating that a domestic wellhead treatment system would be installed on your property's well, by Aqua Science Engineers (ASE), as a more permanent solution to providing MTBE-free watet to the house's plumbing system A copy of this letter is included as Appendix A WELLHEAD TRFAIMENT SYSTEM-DESIGN AND INSTALLATION On December 10 and 11 , 2001 , ASE installed a wellhead treatment system on the well located at 17911 Aitport Way to i emediate low MTBE concentiations pieviously identified in that well This well supplies watei to the residents at the ptopet ty The wellhead treatment system consists of the existing well pump and holding tank, which is then plumbed to two 250 pound granulated activated cai bon (GAC) canisters piped in series Untreated water i s removed from the well and stoied in the existing holding tank Untreated water leaves the holding tank and enters the GAC canisters prior to entering the plumbing system for the i esidences on the property Each o f 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 Water leaving the canisters is then free of MTBE At t h e point in time when the activated carbon can no longer adsorb the MTBE molecules, MTBE will be found in the water stream between the first a n d 208 W El Pintodo, Danville California 94,526 • 925 82a9391 • Fax 925 8374853