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Steven Donell -2- 10 May 2013 PQL=0.3 mg/kg, respectively. However, the California Department of Public Health recommends a 2 ug/L detection limit for reporting arsenic in groundwater. Regional Water Board staff is concerned that the reporting limit for EPA Method 6010b is unable to meet the 2 ug/L reporting limit. In a telephone conversation on 9 May 2013, Mr. Cloven agreed to.change to EPA Method 200.8 to analyze arsenic in groundwater and soil samples. 3. Section I-B. Topography states: As part of this work plan, therefore, a survey of surface. drainage features-i.e., inlets, outlets, outfalls-is proposed." Staff concur with the proposal to map all drainage features and provide the information on a map in the Site Assessment Report. 4. A second set of Former Boring Locations (SB-1007, example provided in Figure Key) were added to Figure 7 and Al Work Plan Investigation Sampling Locations. These additional former boring locations were also included in Figure A2-Area#1 Septic System, but were not included in Figures A-3 (SB-1001 is missing) and A-4 (SB-1007 and SB-1005 are missing)for Areas 2 and 3. Please include the additional former boring locations in Figures A-3 and A-4 in the Site Assessment Report to ensure that all previously collected data points are included in these Figures. 5. Section II.I-F. Well Sampling: Lists Nitrate Chloride as a constituent for groundwater testing. Nitrate Chloride appears to be a typo, and the Work Plan should list separate nitrate and chloride analyses, but should not be confused with CINO3-chloride nitrate. Staff concur with the EPA Method 300.0 for nitrate and chloride analyses. If you have any questions regarding this letter or project, you may contact me at(916) 464-4825 or by email at apalmernwaterboards.ca.gov . Sincerely, Ann M. Palmer Private Site Cleanup Cc: Peter Cloven, Pinnacle Environmental, (Electronic Copy)