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1%wo, •,.✓ <br /> 0x� Eonwa G.BRew.M. <br /> GGr�� <br /> 0 <br /> ewurOww�w ' dwa ur RGwmOmx <br /> Water Boards em P <br /> Central Valley Regional Water Quality Control Board <br /> 30 January 2013 <br /> Leon Marineau Chris L'Orange <br /> Cascades Inc. Drinker Biddle & Reath LLP <br /> 471 Marie-Victorin 50 Fremont Street <br /> Kingsey Falls, Quebec, Canada JOA 180 San Francisco, CA 94105 <br /> DOCUMENT REVIEW, DUPACO, INC., 800 WEST CHURCH STREET, STOCKTON, <br /> SAN JOAQUIN COUNTY, REGIONAL BOARD CASE 391187 <br /> 1 reviewed the Well Installation Report(Report) and CPT-13 Area Investigation Work <br /> Plan (Workplan) received as one document on 22 January 2013 from Geosyntec <br /> Consultants (GC), the consultant for Dopaco, Inc. The Report provided the results of <br /> the November 2012 installation of three of the four monitoring wells approved by my <br /> 18 September 2012 letter. The Workplan proposed four soil borings spaced around <br /> CPT-MIP-2012-13. <br /> The Report states DMW-1, DMW-3, and DMW-4 were installed as 2" diameter polyvinyl <br /> chloride casing with 0.020" slotted well screens placed from 30' below ground surface <br /> (bgs) to 40' bgs. Groundwater flow direction was towards the north/northwest at a <br /> gradient of 0.004 ft/ft. DMW-2 was not installed and was renamed as boring BH-2. <br /> Benzene, toluene, ethylbenzene, xylenes, fuel oxygenates (including MTBE), lead <br /> scavengers (including 1, 2-dicholorethane or 1,2-DCA), and chlorinated solvents were <br /> not detected in groundwater at detection limits of 0.5 micrograms per Liter (ug/L) to <br /> 10 ug/L. Total petroleum hydrocarbons as gasoline was not detected in soil at 1.0 <br /> milligram per kilogram. The following soil sample results for BH-2 are reported in <br /> micrograms per kilogram (ug/kg) in the table below. <br /> Depth Toluene Acetone 2-Butanone Other VOCs TPHd <br /> 28'-28.5' <360 8,500 1,100 ND 2,100 <br /> 36'-36.5' <360 14,000 2,100 1 ND 2,200 <br /> Other VOCs=Volatile Organic compounds full scan by EPA Method 8260B <br /> TPHd=total petroleum hydrocarbons as diesel,does not matching the TPHd-standard chromatograph <br /> ND=non-detect at the respective detection limits from 310 ug/kg(MTBE)to 3,600 ug/kg(1,2-DCA). <br /> The Report recommends semi-annual groundwater sampling and quarterly <br /> measurement of water levels in DMW-1, DMW-3, and DMW-4. <br /> The Workplan proposed four initial, undesignated soil borings (with possible step out <br /> increments on 10' squares) spaced evenly approximately 20' around CPT-MIP-2012-13, <br /> Kwwt E. Lnnauea SCD, P.E.,GKfd R 1 Puaeu C.Cnemm P.E.,SCFE,DOB "We GFRGER <br /> tI=Stili Cwtw ofte RM FkrK't-Cialdam GA 25M I www-watWb0iw'd&0&G0VkWlViUYaH4V <br /> a RGCVCLEG MPGR <br />