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rY3�,3�+ti+(if3 +.;u:::airt!rarcir� '-:s -'. 9 �, ,�. - _ x�� a r�- r_ r ✓ '� � b :,� <br /> SIB►A! ERWORK <br /> GEOCHEMICAL•GEOTECHNICAL•ENVIRONMENTAL <br /> 1�y � ;1C,�°�g <br /> June 14, 1989 ,�I;i P <br /> fps. Diane Hinson <br /> San Joaquin Local Health District <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Tri/Valley Growers Thornton Plant, 26200 Nowell Road, <br /> Thornton, CA <br /> Dear Diane: <br /> Enclosed for review is the summary report for the above <br /> referenced site. We will initiate our recommendations when we <br /> receive permission from your office. <br /> fled During the April 13, 1989 monitoring, an oily substance was <br /> , } - detected on the water probe; when removed from MW-1. The well was <br /> cleared with a nylon brush and pumped for three hours on April <br /> 19, 1989. At the and of pumping a water sample was collected for <br /> analysis of benzene, toluene, ethylbenzene and xylene (BTEX) and <br /> total petroleum hydrocarbons (TPH) by EPA methods 8015 and 8020. <br /> A sample was also analyzed for oil and grease by EPA method <br /> 413.1. The test results reported 27 parts per million (ppm) oil <br /> and grease and non-detectable levels of BTEX and TPN. Laboratory <br /> reports and chain-of-custody forms are attached. <br /> Conversations ,,tth plant personnel and on-site observations <br /> suggest that the oil and grease is the result of surface runoff <br /> infiltrating into the monitoring well. The well is located next <br /> to the fork lift repair shop which has visible surface spillage <br /> of oil. A previous consultant placed the well in a low area with <br /> a non-waterproof well box. During rainstorms, the box was <br /> submerged in ponding water. In an effort to control this, a PVC <br /> extension was added to raise the top of the well.. This extension <br /> was subsequently broken off. WaterWork has installed a new <br /> waterproof well box which is raised to approximately one inch <br /> above the ground surface to prevent future runoff. <br /> Because of the non-detectable levels of BTEX and TPH, and low <br /> concentrations of oil and grease, we.-..recommend_no.--.further._.action <br /> .-...._- <br /> bs rdquired. The .replacement of the well box should <br /> prevent <br /> future runoff from entering the well. <br /> 1710 MAIN SMET • F.SCALON,CA 95320 • (209)8383507 <br /> FRESNO,CA(209)222-3495 • RENO.NV(702)788.6830 <br />