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i <br /> 6 <br /> ETTIER - RYAN NC. <br /> September 21, 1998 <br /> Mr, Ed Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> { Roseville, California 95661 <br /> Sabfect. Well Destruction At Former. Tosco (Unocal) Service Station No. 542 1, 7303 Pacific Avenue, <br /> Stockton, Calirornia. <br /> Mr. Ralston: <br /> At the request of Tosco Marketing Company (Tosca), Gctticr-Ryan Inc. (GR} observed the destruction of four ' <br /> groundwater monitoring wells at the above-referenced site (Figure 1). On August 27 and 28, 1998, Woodward <br /> Drilling Inc. (C57 #710079) drilled out wells MW-1 through MW-4. Well locations are,shown on Figure 2. A copy <br /> of the San Joaquin County Public Health Services (SJCPHS) well destruction permit is attached. Well destruction <br /> activities are summarized in Table I. <br /> Tour 2-inch diameter wells were drillcd out one foot past their total depths with 8-inch diameter hollow-stem augers <br /> to remove the annular seal, sand pack, and well casing. The borings were then backfilled with neat cement using a <br /> tremie pipe and pump. The well boxes were removed and the borings were finished to surface grade with concrete. <br /> One composite soil sample was collected from the drill cuttings for disposal characterization, and submitted to <br /> Sequoia Analytical for analysis. Analytical results are attached. On Septetrlber i, 1998, approximately 225 gallons <br /> of decontamination water was removed by GR and transported to Tosco refinery in Rodeo, California. On September <br /> 3, 1998, drill cuttings were removed by Denbeste Transportation Inc.,(Denbeste) for disposal at Forward Landfill in <br /> Stockton, California. <br /> . 1 <br /> The wells have been properly abandoned according to the State of California Water Well Standards (Bulletin 71-81 1 <br /> and 74-90) and the SJCP14S guidelines. If you have any questions, please call our Sacramento office at (916) <br /> 631-1300. <br /> Sincerely, <br /> Gettler-Ryan Inc.- <br /> Todd A. Del Frate <br /> ( Geolo ist y R9 <br /> s <br /> No.5577 <br /> 'Stephen J. Carlc - <br /> Senior Geologist N� ��- <br /> R.G. 5577 <br /> FOF CAS-SFO <br /> Attachments: Figure 1. Vicinity a <br /> Figure 2. Site plan <br /> Table 1. Summary of Well Destruction Activities <br /> Well Destruction Peri-nit <br /> Laboratory Analytical Results and Chain-of-Custody <br /> 140162.03-2 <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 510 ) 551 -755,5 <br />