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EXCELTECH <br /> 41674 CHRISTY STREET FREMONT, CA 94538 <br /> PHONE (415) 659-0404 • CONTR. LIC. NO. 464324 <br /> July 28, 1987 I•U 7 -10P7 <br /> P7 <br /> Project #1582G ENVIRUVLN"[AL HLALTH <br /> FERMIT/SERVICES <br /> oo ��- -5 l;G <br /> Mr. Juan Quijano C4 t .5 <br /> Tri-Valley Growers <br /> P. O. Box 3327 <br /> Modesto, CA 95353 <br /> Re: Tri-Valley Growers, Plant T <br /> Site Assessment, Monitoring Well Permitting <br /> 26200 Nowell Rd-Thornton, California <br /> Dear Mr. Quijano: <br /> We are sending you this letter regarding our telephone conversation of July 28, 1987, <br /> concerning the above referenced facility. The following discussion concerns the San <br /> Joaquin Local Health District's (SJLHD) memo to Exceltech dated July 20, 1987. <br /> This memo contained changes and/or clarifications be made to Exceltech's proposal <br /> for a site assessment at the Tri-Valley Growers' facility in Thornton. <br /> Exceltech's responses to the SJLHD are as follows: <br /> 1. Soil and groundwater samples will be analyzed for total extractable hydrocarbons <br /> (diesel fuel) in addition to BTX and total volatile hydrocarbons. <br /> 2. Groundwater samples will be analyzed for organic lead using State Department of <br /> Health Services Methods in addition to the above analyses. <br /> 3. Monitoring wells will be located so that the on-site groundwater gradient can be <br /> determined and at least one well will be down-gradient. <br /> 4. It has been requested by the San Joaquin Local Health District that all domestic <br /> water supply wells within one-quarter mile of the Tri-Valley Growers' site be <br /> identified and located. It is Exceltech's understanding that the SJLHD will provide <br /> assistance in this process by providing access to well records and files. The files must <br /> be reviewed by our field geologist so that the site proximity to nearby wells enables <br /> choice of the nearest well to be sampled prior to field work. <br /> Since sampling is required by the SJLHD, we understand that the following is <br /> needed. Sampling will proceed only with permission from the individual property owners. <br /> Well selection for sampling will be made in the field by the Exceltech geologist who <br /> will choose the wells nearest the site in the apparent down gradient direction. It is our <br /> understanding that a SJLHD representative must be present to assist when the wells are <br />