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HomeMy WebLinkAboutRUGGLE WELL - OT General - 6/15/1999 Parametrix, Inc. Consultants in Engineering and Environmental Sciences 5808 Lake Washington Blvd. N.E. Suite 200 Kirkland,WA 98033-7350 425-8'2-8880•Fax:425-889-8808 JUN 16 1999 MASON CO.PIANNlNG DEPT June 15, 1999 55-1682-30(01) Mr. Gary Yando Mason County Department of Community Development 411 N. 51h Street Shelton, WA 98584 Re: Response to Questions Regarding the Occurrence of Tetrachloroethene irk Ruggle Well Dear Gary: This letter contains information to answer your specific questions regarding the occurrence of tetrachloroethene in the Ruggle well. The answers to these questions were also provided verbally to Barbara Trejo at the State Department of Health on June 15 per your direction. This letter also provides other pertinent information regarding the Ruggle well. RESPONSE TO QUESTIONS 1. When was tetrachloroethene first detected in the Ruggle hell? Tetrachloroethene was first regularly detected in September 1995 when laboratory analytical methods were modified to lower detection limits (from 1.0 ug/L to 0.2 ug/L). Levels of 0.3 to 0.4 ug/L have been consistently detected since this time. However, estimated values ranging from 0.5 to 0.8 ug/L were also reported on four occasions between 1989 and 1991. 2. Do we test the old or new well? We have tested the new (deep) well since the well was installed in June 1990. The old (shallow) well was tested prior to June 1990 (between November 1989 and May 1990). Five additional monitoring events were conducted at the old well (Waldberger) between July 1986 and October 1988, although the samples were not tested for volatile organic compounds. Quality Service Through Employee Ownership Mr. Gary Yando Mason County Department of Community Development June 15, 1999 Page 2 3. Has tetrachloroethene been detected in the Auto Wrecking well? Tetrachloroethene has not been detected in this well since monitoring began in 1989. 4. Why was the new well drilled? No information was available in the Parametrix file to answer this question. 5. How often was the Ruggle well monitored prior to 1996 when the sample frequency changed? The well has been monitored quarterly since November 1989, although a few events (August 1990, November 1991, February 1992, November 1992, February 1993 and May 1993) were missed between 1990 and 1993 because the owner was not home during the sampling event. 6. Provide copies of data for the Ruggle ivell hetiveen 1991 and 1996. A spreadsheet summarizing the volatile organic compound data is provided in Attachment A, and was e-mailed to Barbara Trejo on June 15. OTHER INFORMATION The following information is summarized from the Mason County Landfill Final Closure Plan (Parametrix 1991) and subsequent monitoring reports prepared by Parametrix. The new Ruggle well (former Blucher) is completed in gravels underlying 52 feet of clay. This is a deeper aquifer than that monitored by the current site monitoring wells (see well log and cross sections presented in Attachment B). A 50 to 70 foot thick low permeability silt layer (Unit B) with a hydraulic conductivity of less than 10-6 cm/sec act as an aquitard between the upper aquifer (Unit A) from the lower aquifer (Unit Q. Formerly monitored on-site well TH-ID is also completed in the lower aquifer. Tetrachloroethene was not detected historically in well TH-ID (1989 through March 1995). Please call me at (425) 822-8880 if you have any questions regarding this information. Sincerely, yj 0 v Lisa A. Gilbert Hydrogeologist Attachment A Ruggle Well Data Summary Attachment B New Ruggle Well Log; Geologic Cross Sections ATTACHMENT A RUGGLE WELL DATA SUMMARY y iC 0 O O Do 00 7 d V O\ U to N 7 = r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r '' C) N O 0 0 0 0 C r Cl r C O O O O r r 0 r O r 0 r O C 0 0 0 0 t 7 b0 00 r r p r r r r r r r r V V V V V r V V V r V V V V V r V V V V V V V V Z, N N U W �_ r r C 0 0 0 0 O r 0 O O O O r O O O O O C O 0 0 0 O ^ r r O V V V V r V r V r V r V V V r r r V r r V r r r V r V ' V V V V V V v a� N t7Eb r i i r r r r r r i r i i i O O O O r 0 O v1 r 0 i r 0 O O L W V to N r r r i V V r i V r V r V r V r V r r r r V r r V r r r V r V r V V V r r V b � � V O C r 0 r C r 0 O r 0 ; r r C r r C r r r r O r 0 0 0 O O = N N v> r r r r r r r r r r r r r r r r r r r N V V V V V V V V V V V V V V O O O O O C O CDO U r r _ r r r _ r _ r _ _ _ O o\o r r r r V r r V r V V r V r V r r r r V r r V r r r V r p r V V V r LY1 N O a ^O O a� S W [Q O O r vl r 0 7 7 r enV r r V r V r V r r r V r r r r V r V r r r V r O r v r r r r r O 00 V ^� � O'D Cl In - V to i N C G pq O i r 0 r 0 V 00 N r r r r O h r r r v r v r r r v IL) lu oho W U top r ; r r ; r r W r r r r O r r v r C r r r V r r r r p r V r r r r r r r r r r r co . 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