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August 1, 1968 <br /> k <br /> Mr. David Carls <br /> Sari Joaquin County <br /> Local Health District <br /> Stockton, CA <br /> i <br /> RE: Preliminary investigation, ETS project number: C►3 <br /> f I <br /> Dear Mr. Carts w, t`Iowgf� R.aIICC(- <br /> In response to our phone conversations regarding .the <br /> workplan prepared for the site mentioned above, 1 have' <br /> prepared this letter and attachments to clarify the vai,ious <br /> aspects of the report that concerned you. <br /> As mentioned in Section 1. 1 Purpose of the workplan, <br /> this site investigation is preliminary only and is merit to <br /> determine the presence or absence of contamination on .the <br /> site. A full-scale site investigation will be undertaken <br /> should circumstances warrant such an effort. <br /> The site map has been updated to show sewer line/septic <br /> system locations. This information was provided to ETS by <br /> Mr. Jerry Moore. No soil borings or wells will be drilled <br /> at this time within the fifty foot perimeter stipulated by <br /> yourself. <br /> Soil samples will be collected at five foot intervals. <br /> Obvious contamination as evidenced by odor and sight will <br /> mandate that the sample be run as a distinct sample. Where <br /> there is doubt, the sample will be run as a distinct sample. <br /> However, should it be apparent that no contamination is <br /> present in two or more sequential samples, they will be run <br /> as a single composited .sample. The exception to this is the <br /> bottom hole sample which will be run separately in all <br /> instances. <br /> �L <br /> Soi1 samples will be analyzed for gasoline by GC/1- 11) <br /> using EPR extraction method 5030, for TPH (diesel ) using fZYo <br /> sonification extraction, and for TEL. BTX and E will �1so be <br /> reported. Should contamination be encountered in an area <br /> believed to be the site of a waste oil tank, a PCB scarf will 'FOP <br /> be run. This determination will be made in the field by .-CAf,/,fR <br /> visual inspection and oder emission when appropriate. ed Cr P6 Z^- <br /> Groundwater samples will be analyzed using EFTA method 7`2 PID <br /> Wells that are completed in areas of obvious <br /> contamination will be developed using an air-lift system <br /> until the water runs clear. The well development water, will <br /> be containerized and left on-site for later treatment acrd/or <br /> disposal. The well will be allowed to stabilize 24 hours <br />