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07/14/2000 16:53 2095385 • H GEOLOGICAL TECHNICS PAGE 02/03 94a6Si A(T4chnru7.nc • Project#425.2 Page 1 Geological Technics Inc. 2741*i r*,d 9 gado,cariforma 95,351 (209)538-6424/ga #538-5852 July 14, 2000 Project No.: 425.2 Project Name: George's Service (Durham Ferry) Carol Oz, Senior RENS Environmental Health Division, San Joaquin County Public Health Services 304 East Weber Avenue, Third Floor Stockton, CA 95202 Re: Remedial Alternative Evaluation Work Plan dated 6/20/00 Dear Ms. Oz: We received your letter dated July 5, 2000 disapproving the Remedial Alternative Work Plan dated June 20, 2000 sent by Geological Technics Inc, on behalf of Mr. and Mrs. Teranishi. You sited the following reasons for not approving the Work Plan. I. Elements in a letter from PIIS/EHD dated May 5, 2000 and September 8, 1999 were not addressed in the work plan. • Your September 8, 1999 letter asked the following: ❑ That all domestic well within a 2000-foot radius be plotted on a map and that construction detail be provided where available. A report of the revised receptor survey will be submitted shortly. ❑ That two remedial alternatives to be evaluated. We provided a general evaluation of five remedial alternative, gave reasons why three of them would not be effective and recommended that the other two be evaluated in more detail. Thus meeting that request. ❑ That the domestic well 1600A be investigated and evaluated for contaminant impact. We addressed that is Section 3.3 in the June 20,2000 work plan. • Your May 5,2000 letter asked the following: ❑ That quarterly groundwater monitoring reports be submitted "within 30 days of completing the sampling event". This was addressed in Section 3.1. ❑ Fate and transport modeling has not been performed. We can include that as a remedial alternative to evaluate. However, it is our opinion that removing contaminants from the soil and groundwater is the preferred method, not just evaluate the risk they pose to the domestic water wells. ❑ A report of the revised receptor survey will be submitted shortly. ❑ DW 1600A is in use for shop purposes, not for house or drinking purposes. The house is not in use. We address this issue in Section 3.3.