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PUBLrC HEALTH SERTC <br /> 106: KHANNA Nt.l:. <br /> P.O- Box 2009 a (1601 East Hazelton Avenue) • Stockton, Califnrni? 95201 <br /> (209) 468-34M <br /> CLINT ROGERS <br /> CHEVRON USA A 2b <br /> P 0 BOX 5004 <br /> SAN RAMON CA 94583-0804 <br /> RE: Ulycess Williams Property SITE CODE: 9034 <br /> Former Chevron #9-5075 <br /> 2400 Airport Way <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the <br /> work and reports completed by Versar, Inc. and Groundwater Technology, Inc. (GTI) on the above listed <br /> site. The latest report was prepared by GTI on February 22, 1991, and titled "Site Assessment Report". <br /> To date the following activities and results have been reported. Total petroleum hydrocarbons as <br /> gasoline were detected at 32 parts per billion (ppb) in the water sample collected from monitoring well <br /> #1 on September 6, 1989. In November 1990 two additional monitoring wells were installed <br /> (monitoring wells #2 and #3). In January 1991 monitoring well #4 was installed. These wells were <br /> surveyed, water level measurements were taken and the groundwater gradient was determined to be to <br /> the northeast. Monitoring wells #1, #2 and #3 were sampled on December 4, 1990. Monitoring well <br /> #4 was sampled January 25, 1991. Contamination was not detected in any of those water samples. <br /> Further investigation of this site is warranted. Water level measurements should be taken to confirm the <br /> northeast gradient. If the gradient is confirmed to be to the northeast the site does not have a <br /> downgradient monitoring well. The placement of the downgradient well should be determined by the <br /> distance the contamination would have moved since the underground tanks were removed in 1977. <br /> Once the existence of a downgradient well has been established a minimum of two rounds of samples at <br /> least 30 days apart with no detection of contaminants would be required to consider the site for closure. <br /> A"Chain of Custody" for the water sample obtained from monitoring well #4 was not included in the <br /> February 1991 report. In addition a survey of wells within 2000 feet of the site has not been Conducted. <br /> Pursuant to Section 2652 (d) of the Underground Storage Tank Regulations (California Code of <br /> Regulations, Title 23, Chapter 16) quarterly monitoring reports are to be submitted to PHS/EHD and <br /> Central Valley Regional Water Quality Control Board until the investigation and cleanup of the site is <br /> deemed adequate. The above listed information should be submitted in your next quarterly report which <br /> should be completed by July 1, 1992. <br /> If you have any questions contact Margaret Lagorio, Senior RENS, at (209) 468-3449. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health O 1&r j <br /> "ECEIVED <br /> rie A. Cotulla, RENS, Program Manager J 0 $ '�g <br /> nvironmental Health Division <br /> LAC/ML:Ib ENVIRONMLNI'AL HEALTH <br /> PERMIT/SERVICES <br /> Msion of san Joaquin Count} Health Late Services r <br />