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PUBLIC HEALTH SER 710ES <br /> SAN JOAQUIN COUNTY <br /> JOG[KHANNA M.D.MTR <br /> Health Officer <br /> P.O. Box 2009 (1601 East Hazelton Avenue) • Stockton,California 95201 1 F o Q <br /> (209) 468-3400 <br /> LYLESTECK <br /> PACIFIC BELL <br /> 1717 BELLOMY STREET <br /> SANTA CLARA CA 95050 DEC 1992' <br /> RE. Pacific Bell UE042 SITE CODE. 1867 <br /> 345 North San Joaquin Street <br /> Stockton, CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has completed review of the "Work Plan for Offsite Investigation" dated October 1992 <br /> and prepared by International Technology Corporation (IT). PHS/EHD has the <br /> following comments for your consideration. <br /> The work plan proposed six soil borings which were located to investigate possible <br /> contamination associated with the three 25,000 gallon diesel tanks, SB1 and SB2, and <br /> possible downgradient contamination associated with the two diesel tanks closed in place, <br /> SB3 - SB6. The proposed soil borings were to be driiled to 50 feet with a qualitative <br /> water sample to be collected from each bore hole prior to destruction. Additionally, <br /> depending on the analytical results two borings may be converted to monitoring wells. <br /> The mobile lab used must be Department of Health Services certified as a mobile lab <br /> and for analytical methods which will be utilized during the investigation. <br /> Soil contamination was detected during the drilling of MW3 and groundwater <br /> contamination was detected initially after drilling and development of MW3; however, <br /> the work plan did not propose to investigate contamination documented in this area. <br /> Please be aware that additional investigation in the area of MW3 will be necessary. <br /> Furthermore, since soil contamination was detected at 20 feet below ground surface (bgs) <br /> MW3 and at 10.5 feet bgs (SS1 and SS3 beneath the tanks closed in place) consideration <br /> should be given to analysis of samples collected at those depths and at depths which are <br /> estimated based on migration patterns and site Iithology. Field screening for diesel <br /> contamination is difficult because diesel is semi-volatile and not easily detected using <br /> traditional field screening equipment. <br /> A Division of San Joaquin County Health tare Services �� <br />