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Mr. Jogi Khanna 202/029000-080 September 13, 1988 Page 2 detectable concentrations. It should be noted that odors encountered during drilling are very subjective and should be verified by PID or laboratory anaayses. The urban environment, subsurface conditions, rig exhaust and overheated augers combine to make odor calls difficult and general. The PID is used to alleviate the problem by placing soil; from drill cuttings or each sample interval; into a z:p lock bag, and after allowing time for voliti.zation, analyzing .the air within the bag. A question was raised regarding the laboratory analysis of soil and ground water samples by EPA Method 418.1 . It should be noted that GTI's work plan, included within the Preliminary Report dated March 16, 1988, was approved by the San Joaquin Local Health District prior to the assessment phase of the investi- gation. GTI recognizes the recently amended analytical require-- meets established by the Central Valley Regional Water Quality Control Board, Region V. GTT would be happy to resample the three existing groundwater monitoring wells and submit the samples for analysis of BTEX and TPH as gasoline by modified EPA Method 602 and TPH as diesel by modified EPA Method 801.5 (GC/FID) . Addressing your request to describe the handling, analysis, treatment and deposition of the excavated contaminateu soils, GTI has enclosed a letter to Mr. David Carls (SJLHD) dated March 28, 1988, which summarizes Mr. Carl's concerns after his review of the Preliminary Report and work plan (dated March 16, 1988) . The enclosed correspondence specifically addresses GTI's intentions for handling and treatment of the excavated soil (Attachment II) . GTI believes that the soil and groundwater conditions at the site have been addressed and defined as stated in the assessment report dated May 25, 1988. GTI has not yet initiated a ground- water monitoring and sampling program. Subsequent to the recommendations of the Assessment Report, GTI feels that a quarterly monitoring and nonthly sampling program would be warranted. GTI hopes that this letter clarifies all questions noted in your letter. If you have any additional questions, please call our Sacramento District office at (916) 921-1800.