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® science <br /> AMF %MEW V FMV• <br /> January 28, 2003 <br /> Ms Anita Cassidy <br /> 625 El Portal Avenue <br /> Manteca, CA 95337 <br /> SUBJECT REPORT OF SEMI-ANNUAL OPERATION & MAINTENANCE <br /> OF REMEDIATION SYSTEM, CASSIDY PROPERTY <br /> 17926 AIRPORT WAY, MANTECA, CA <br /> ID reference to_ <br /> Frank's One Stop <br /> 2072 West Yosemite Avenue <br /> Manteca, California <br /> Dear Ms Cassidy, <br /> On December 13, 2002, Aqua Science Engineers, Inc (ASE) arrived at the <br /> subject site to perform routine semi-annual operation and maintenance <br /> (O&M) activities in relation to the domestic well remediation system <br /> operating at the site <br /> The domestic well remediation system consists of two 250-pound <br /> granulated activated carbon (GAC) canisters plumbed in series <br /> Groundwater is pumped from the well, into the holding tank, then <br /> through the carbon canisters prior to entry into the houses on t h e <br /> property <br /> On December 13, 2002 ASE collected water samples as follows <br /> Sample Lam_ to ion Sample Id <br /> Directly from the well, pre-treatment 17926-INF- 12- 13-02 <br /> After treatment by the 1st carbon canister 17926-GAC 1-12-13-02 <br /> After treatment by the 2nd carbon canister 17926-GAC2--12-13-02 <br /> The samples were placed within an ice chest containing wet ice while <br /> transported to Kiff Analytical of Davis, California (ELAP# 2236) under <br /> chain of custody procedures The samples were analyzed for total <br /> petroleum hydrocarbons as gasoline (TPH-G), benzene, toluene, <br /> ethylbenzene, and xylenes (collectively known as BTEX), the five fuel <br /> oxygenates, and lead scavengers by EPA Method 8260B A copy of the <br /> - 1 - <br /> '�C8 V\/ F1 P1 tac/L,, Dai,vllle Califa+nio 94526 o 92-15820-9391 o Fax 925 8;7 4853 <br />