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r <br /> LENVZIRONMENTAL,we 3330 Cameron Park Drive, Ste 550 <br /> Cameron Park, California 95682 <br /> (530)676-6004-Fax;(530)676-6005 <br /> t <br /> f ' <br /> 1jEL 1 7 2007 <br /> �NV� itiN �ICES December 14, 2007 <br /> ER1I�jS�R Project No. E6080-06 <br /> Ms. Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Well Abandonment Letter Report <br /> ARCO Station No. 6080 <br /> .85 East Louise Avenue <br /> Lathrop, California <br /> Dear Ms. Duncan: <br /> f <br /> Stratus Environmental, Inc. (Stratus), on behalf of Atlantic Richfield Company (ARCO, a <br /> BP-affiliated company), has prepared this Well Abandonment Letter Report for ARCO <br /> Station No. 6080, located at 85 East Louise Avenue, Lathrop, California. Groundwater <br /> monitoring wells MW-i through MW-3 were abandoned in accordance with San Joaquin <br /> County Environmental Health Department(SJCEHD) regulations. A site plan depicting the <br /> location of these wells (supplied by Secor International Inc.) is attached. Abandonment of <br /> these wells was approved in a letter from SJCEHD dated September 20, 2007. <br /> Prior to initiating well abandonment activities, a well abandonment permit was obtained <br /> from SJCEHD (copy attached). A licensed drilling contractor (Woodward Drilling Co., <br /> C-57 #710079) performed the well destruction activities. All work was completed under <br /> the direction of Stephen J. Carter, P.G. Ms. Lori Duncan of SJCEHD was present to observe <br /> well abandonment activities. <br /> The area in the immediate vicinity of the abandoned wells was excavated to 5.feet below <br /> ground surface (bgs) using an air knife rig on December 5, 2007. On December 7, 2007, <br /> monitoring wells MW-1, MW-2, and MW-3 were abandoned by overdrilling the wells to <br /> their total depths (28, 27, and 26 feet bgs, respectively). These borings were then <br /> backfilled with neat cement placed with a tremie pipe. A concrete patch was placed over <br /> each former well location flush with the surrounding pavement. Waste material was <br /> placed in drums and will be removed for proper disposal by Belshire once waste <br /> characterization analytical results have been received. <br /> K:1BP-ARCO Execute1608012007 Data Packages\Arco_6080_Well Abandonment Letter.doe <br />