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V1rATERWORK <br /> GEOCHEMICAL• GEOTECHNICAL•ENVIRONMENTAL <br /> October 24, 1990 <br /> 0,C�? <br /> Ms. Darlene Reuss <br /> San Joaquin County Public Health L� e� <br /> Environmental Health Division <br /> Post Office Box 2009 <CI <br /> Stockton, California 95201 <br /> I <br /> Re: Site code 1920, Tri Valley Growers, Plant T, 25200 <br /> Nowell Road Thornton,. CA T=. <br /> Dear Darlene: <br /> On behalf of Tri Valley Growers I am writing to address the <br /> k comments and questions presented in your October 15, 1990 letter. <br /> I 1. ) Question: The utilization of an existing two ( 2 ) inch <br /> diameter monitoring well as an extraction well <br /> is not recommended. This well was not designed <br /> as an extraction well. Furthermore, PHS/EHD <br /> f questions whether the location of this well is <br />[ appropriate for efficiently extracting <br /> contaminated groundwater. Propose a properly <br /> designed extraction well (minimum four (4) inch <br /> diameter casing and screen) located in the <br /> vicinity of the underground storage tank pit. <br /> Response: This question was responded to in our letter <br /> dated October 10, 1990. A copy is attached for <br /> your reference. The design and construction of <br /> the ,well is appropriate for-use- as an extraction . <br /> well, regardless- .of whether it -was L intended :for <br /> _ -- this use at the time of installation. <br /> I <br /> I <br /> 2. ) Question: Oil and grease contamination levels are elevated <br /> and the plume of contamination appears to be <br /> migrating. Propose methods to be used to <br /> I <br /> investigate and remediate the source. <br />�€ Response: The latest laboratory results from MW-1 did not <br /> f report oil and grease concentrations above <br /> method detection limits. The fluctuation in the <br /> concentration may be related to the changing. <br /> I flow direction, but it is impossible to <br /> I <br /> i <br /> 1710 MAIN STREET • ESCALON, CA 95320 • (209) 838-3507 <br /> FRESNO CA(209) 222-3495 • RENO, NV(702) 788-6830 <br />