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SENT BY EMCON 6-16-98 ; 1 54PM EMCON SACRAMENTO- 3/ 6 <br /> • I • <br /> n IMMI <br /> 1433 North Market Boulevard-Sacramort,o,CA 34-1943•(916)928-3300.Fax(916)926-3341 <br /> ,tea <br /> June 12, 1998 <br /> Project 20C42-001.026 <br /> Mr. Ronald Rowe <br /> San Joaquin County Public Health ervices � <br /> Environmental Health Division 1 <br /> 304 East Weber Avenue, Third F14 <br /> Stockton,California 95202 <br /> Re: Water Production Well Abandonment, Tesoro Distribution Terminal, Stockton, <br /> California <br /> Dear Ms. Rowe: <br /> I <br /> The water production well 17A at the Tesoro distribution terminal located at <br /> 3003 Navy Drive in Stockton, Cal omia, was abandoned on February 6, 1998. The <br /> intent of this letter is to address a issues raised during ubandonment activities and <br /> presented in your 1 3, 1998 1 er to Gail Wiggett of the Central Valley Regional <br /> Water Quality Control Board. <br /> i <br /> METHODS f <br /> EMCON contracted Water Development Corporation, a licensed California drilling <br /> contractor to perform well abandorunent activities. A video log of the well conducted on <br /> September 3, 1997, shows the will casing was in poor condition with numerous <br /> corrosion holes present and that the I urrent depth of the well was approximately 55 feet <br /> below ground surface(bgs). <br /> During the well abandonment, the tr�mie pipe was placed through the center of the well <br /> casing to a depth of approximately 5 feet. The tremie pipe encountered an obstruction at <br /> this depth, consistent with the obstIliction depth identified in the video log. Four cubic <br /> yards(8 10 gallons)of neat cement grout were pumped through the tremie pipe starting at <br /> 2:35 P.M. The calculated grout voltime to fill the borehole was 323 gallons. Placement <br /> of this batch of grout ended at 3:00 O.M. At this time, the grout level was measured. A <br /> firm grout tag indicated the grout lev161 was 10 feet bgs and the tremie pipe was pulled up <br /> to confirm. The grout level on the trImie showed that the grout was present at 5 feet bgs <br /> (consistent with Section 4.7.4 of the!PHS/EHD Well Standard). Thus, the weighted tape <br /> passed through the upper 5 feet of the grout column. The tremie pipe was removed from <br /> the hole and the well casing was puled. Approximately 44 feet of casing were removed. <br /> SACW.TJ010C42WC4200126Ar-98'cbell:1 I R",0,nine 12.1998 <br /> i <br /> I <br />