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Kennedy/Jenks Consultants <br /> Ms Diane M Hinson, REHS <br /> 17 September 1993 <br /> Page 2 <br /> LABORATORY ANALYSES RESULTS <br /> As indicated on the attached laboratory report sheet, no chemicals of concern were <br /> detected in MW-5 Concentrations of TPH-G and TPH-D were detected in MW-1 at <br /> concentrations of 6 3 and 31 mgll, respectively In comparison to the results of previous <br /> sampling events conducted for MW-1 the concentrations of TPH remain in the same order <br /> of magnitude Slight variations in concentration may be due to fluctuating groundwater <br /> levels Table 2 provides historic and current groundwater sampling data for MW-1 and <br /> MW-5 <br /> i <br /> I <br /> PROPOSED ADDITIONAL WORK <br /> Based upon the current and historic groundwater sampling results, we propose that <br /> groundwater samples be collected from MW-1 on a quarterly basis for the next three <br /> quarters (December 1993, March 1994, and June 1994) Groundwater samples will not <br /> be collected from MW-5 since chemicals of concern have not been detected in this well <br /> since its installation in May of 1990 Because of the fluctuating groundwater flow <br /> directions, we also propose to calculate the groundwater flow direction in the field during <br /> the next sampling event (second quarter, the 30 August 1993 sampling event would be <br /> considered first quarter) to determine which onsite well is downgradient from MW-1 If <br /> MW-5 is the downgradient well, as it has been historically, it will not be sampled If <br /> another facility well is the downgradient well, a groundwater sample will be collected from <br /> that well and analyzed for the presence of TPH Assuming that chemicals of concern are <br /> only present in MW-1, we propose to only sample MW-1 for the remaining two quarters <br /> (third and fourth quarters) If after these sampling events the concentrations of TPH in <br /> MW-1 remains at the same relative concentration or within the same order of magnitude, <br /> we would request closure of all facility monitoring wells (wells MW-1 through MW-5) <br /> If you have any questions regarding the results of our latest sampling round, or if you <br /> would like to discuss or approach for additional work at the site, please contact me at <br /> (916) 362-3251 <br /> Sincerely, <br /> KENNEDY/JENKS CONSULTANTS <br /> Kele cKmne P C�-J <br /> Y Y. <br /> Project Manager <br /> wrnT <br /> 09/17/93 3 61 pm <br /> attachments <br /> . cc Catherine Whitworth, Trustee <br /> I <br />