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Revised Work Plan for Additional Site Investigation <br />Raymond Investment Corporation <br />Former Helena Chemical Facility <br />February 27,2018 <br />Page 10 <br />5.10 LABORATORY ANALYSES <br />Soil and groundwater samples selected for laboratory analyses will be submitted to BC Laboratories (ELAP <br />#1186) under chain-of-custody protocol and analyzed for the following constituents: <br />Matrix Target <br />Analyte <br />Detection <br />Limit <br />Analytical <br />Method Sample Container Preservative Hold <br />Time <br />Soil Nitrate-N 1.0 mg/kg EPA 300.0 <br />Acetate sleeve or brass/stainless <br />steel tube with Teflon tape and <br />plastic end caps <br />4°C 28 days <br />Soil 1,2,3-TCP 0.010 <br />mg/kg <br />EPA <br />504.IM <br />Acetate sleeve and/or 6" <br />diameter brass/stainless steel <br />tube with Teflon tape and <br />plastic end caps <br />4°C 14 days <br />Groundwater Nitrate-N 10 mg/L EPA 300.0 1,000 ml plastic bottle 4°C 48 hours <br />Groundwater 1,2,3-TCP 0.005 i.ig/L CA DHS <br />524M 40 ml VOA vials 4°C, HCI to <br />pH <2 14 days <br />Groundwater Triazines' 0.20 pg/L EPA 8141 1 liter amber glass bottle 4°C 7 days <br />Notes: mg/kg = milligrams per kilogram = parts per million (ppm); mg/L = milligrams per liter = ppm; 1.tg/L = m crograms per <br />liter= parts per billion (ppb); *C = degrees Celsius; 1,2,3-TCP = 1,2,3-Trichloropropane; ml = milliliter; VOA = volatile organic <br />analysis; HC1 = hydrochloric acid; Nitrate-N = Nitrate as Nitrogen; I = since Triazines (Atrazine, Simazine) have not been <br />detected in any Site monitoring well, only groundwater samples from the newly installed monitoring wells will be analyzed for <br />Triazines. <br />Laboratory results will be evaluated for accuracy, reliability, and repeatability by confirming that the <br />laboratory's matrix spikes, surrogates, and duplicates fall within prescribed limits. <br />6.0 REPORTING <br />Condor will prepare a report detailing the findings of the investigation to be submitted to the Central Valley <br />Water Board and EHD. The report will include a discussion of the field and laboratory procedures used to <br />conduct the investigation, a discussion and presentation of the analytical results, and recommendations. <br />Condor will include a site conceptual model. Condor will use the data collected to prepare a remediation <br />feasibility report after consultation with the Central Valley Water Board. <br />CONDOR