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PUBLIC HP'ALTH SERVICtS <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> qC r F O,R�j� <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> ALAN PATTON <br /> C(Opy <br /> MANAGER UNDERGROUND STORAGE TANK PROGRAM <br /> STATE WATER RESOURCES CONTROL BOARD MAY 041999 <br /> P O BOX 944212 <br /> SACRAMENTO CA 94244-2120 <br /> RE. 26500 NOWELL ROAD SITE CODE: 1930 <br /> THORNTON CA 95686 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has received State Water Resources Control Board correspondence dated April 12, <br /> 1999 requesting our agency's record and position and a list of interested parties for the <br /> above referenced site. <br /> At a minimum, the Tri-Valley Growers canning facility that is located adjacent to the <br /> subject site should have an interest in the investigation of the petroleum contamination <br /> existing at and migrating from this site. Contact person for Tri-Valley Growers is Chris <br /> Savage and the mailing address is 2260 Tenaya Drive, Modesto, CA 95354. In addition, <br /> any record title owners of either of these properties would have an interest in any <br /> request for or intent of closure. <br /> The site is a rural residential property located in Thornton, CA. It is bordered by vacant <br /> land to the north and east, residences across the street to the west, and by Tri-Valley <br /> Growers canning facility to the south. There is an on-site domestic well that is reportedly <br /> used for irrigation purposes. Several of the residences located on the west side of <br /> Nowell Road, across the street from the subject property, have visible domestic wells on <br /> site. The Tri-Valley facility reportedly has production wells on site, but no information on <br /> them has been made available. <br /> In October 1989 one 500-gallon gasoline tank was removed under permit and inspection <br /> from the site. One soil sample was collected at the tank removal and analytical results <br /> evidenced 3.9 parts per million (ppm) total petroleum hydrocarbons as gas (TPHg). The <br /> former tank location is south of the residence on site, near the property fine with Tri- <br /> Valley Growers. <br /> In November 1994 three soil borings were advanced on site (SB-A, SB-3 & SB-4). Soil <br /> and grab water samples were collected from each boring. Boring SB-A, which was <br /> located in the former tank pit area, was advanced to the greatest depth, to 20 feet below <br /> surface grade (bsg). The soil sample from this depth evidenced 1000 ppm TPHg and <br /> 6.8 ppm benzene. The water sample from this depth evidenced 26,000 parts per billion <br /> (ppb) TPHg and 530 ppb benzene. <br /> A Divvi ion :or fan I0»0ncin Count%- Hr:,til Care Vie^ tr= <br />