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_ Vf� <br /> DOULOS ENVIRONMENTAL INC. <br /> 1537 PINE VALLEY CIRCLE <br /> ROSEVILLE,,;; CA 95661 <br /> (916) 7$2-9054 <br /> Ir <br /> May 2,2000 <br /> Farr Associates <br /> Aitn:John M.Farr,Ph.D.,P.E. <br /> 5856 Granite Hills Drive <br /> Granite Bay,California 95746 <br /> Y <br /> Subject: Well Abandonment Letter,Former Union Ice Facility <br /> 425 North Union Street,Stockton,California <br /> Dear Dr.Farr: <br /> Farr Associates contracted with Doulos Environmental Inc:(Doulos)to abandon monitoring wells,and prepare this letter for the subject <br /> site. The purpose of this work was to meet the requirements for case closure for the underground storage tank investigation that was <br /> completed at this site,as requested by Lori Duncan from San Joaquin County Health Services Agency. <br /> FIELD WORK <br /> The work performed included: Obtaining well abandonment permits from San Joaquin County(permits enclosed);abandonment of five <br /> monitoring wells,and preparing a letter report which presents field procedures and volumes of grout used. All activities were completed <br /> in compliance with the San Joaquin County guidelines and California State Department of Water Resources Bulletin 74-81. <br /> Pressure Groutine <br /> On April 5,2000,Doulos personnel abandoned the five site monitoring wells. Prior to pressure grouting the wells,the volume of grout <br /> needed to displace the pore space in the sand pack,and the volume of the casing was calculated.The wells were abandoned in place by <br /> pressure grouting with a neat cement slurry.The grout was placed with a trimmie pipe from approximately five feet above the bottom of <br /> the well to the surface. Sections of trimmie pipe were removed as the grout moved up the casing of the well. After the grout had been <br /> trimmied to the surface,additional grout was added to maintain the grout level at the top of the casing as it pushed its way into the sand. <br /> pack pore space.The actual volume of grout placed in each.well exceeded the previously calculated volume(see Table 1). Well covers <br /> were removed and replaced with black dyed concrete to match existing asphalt. <br /> If you have any questions regarding this matter please contact me at(916)782-9054. <br /> Sincerely, <br /> DOULOS ENVIRONMENTAL INC. �(i�ED GFd�. <br /> Hal Hansen,R.G.#6697,C-57#730042 <br /> HAL E. HANSEN <br /> HEH/,tjh <br /> �r No'. 6697 <br /> (P <br /> Attachments: <br /> San Joaquin County permit �Q <br /> Table <br />