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PUBLIC ' EALTH SERV' ICES QUJry <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION' <br /> Ernest M. Fujimoto M. D. 'M.P..H. Actin <br /> Fujimoto, g Health Officer <br /> 304 E. Weber Ave., Third:Floor • P. O. Box 388 • Stockton, CA 95�OI-0388 `` �lFo �•P <br /> 209/468-3420 <br /> r <br /> ERIC JOHNSON <br /> TECHNICAL AND ECOLOGICAUSERVICES '� .; MAILED °APR 0 81996 -t_ <br /> 3400'CROW CANYON RD <br /> SAN 'RAMON CA 94583 <br /> s <br /> RE: PG&E Tracy Service Center ' `+ - SITE CODE: 1407 <br /> 502 East Grant Line Road I <br /> Tracy, CA } <br /> San Joaquin County Public Health Services,,.Environmental Health Division ,y° <br /> (PHS/EHD) has reviewed the December# 13, ,,1995 Third Quarter 1995 Groundwater <br /> Monitoring Report prepared by Smith'Environmental, your November. 8; 1995 and' <br /> your January 4, 1996 letters, the January 4, 17'i996 Emcon report,.and your December <br /> 15, 1995 lettercontaining the February'3. 1987 report of the self directed subsurface <br /> tank leakage inestigation at the above referenced site: <br /> 4101 <br /> On November 14, 1986 two borings were advanced within 10 feet of the underground <br /> storage tank (UST) as part of a self directed ,preliminary UST removal assessment. <br /> B-1 was advanced north of the UST and B 2'was advanced between tl•ie"tank and the <br /> office building. .'The analytical results of this investigation indicate the presence of <br /> groundwater contamination in both B-1-.and'B-2 in the free product range and soil <br /> contamination in B-1 only. yy <br /> YA <br /> On!'June 24, 1987 EA Engineering, Science, and Techri.ology�'lnc:, of Lafayette <br /> California was retained by PG & E to conduct asoil -vapor survey at the site. "All soil <br /> vapor samples were taken from a depth,of 7:�5 feet.'"'The results of thelsurve-y ` 4 <br /> indicate that there are no vapors detected east or west of the UST. A vapor reading <br /> south of the UST was explained as .an anomaly. The highest vapor readings are north, <br /> east of the UST. €'_-. .. #, .x ;, ., r . <br /> An analytical samplevas obtained,from the` bottom;of the UST excavation`during the i <br /> November 2, 1987 UST removal."There is'no record of that sample haring' been sent <br /> to a lab.for analysis. `' <br /> Six monitoring wells were installed on the site between December 22, 1987 and <br /> February 18, 1988. The well locations were chosen based upon data 66milhe soil <br /> vapor survey. Monitoring well OW-2 was iocated'where the highest vapor readings <br /> -1- <br /> A Division of San Joaquin Count-,•Health Care Sen-ices <br />