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CONDOR EARTH <br /> 188 Frank West Circle, Suite t <br /> Stockton,CA 95206 <br /> 209.234.0518 <br /> Fax 209.234.0538 <br /> CONDORwww.condorearth.corn <br /> August 14,2020 <br /> Ms. Aimee Phiri,P.E. <br /> Water Resources Control Engineer <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova, CA 95670 <br /> Subject: Addendum to Work Plan for Additional Subsurface Investigation, dated July 13, 2020 <br /> Raymond Investment Corporation-Helena Chemical Facility <br /> 2245 West Charter Way, Stockton, San Joaquin County <br /> Dear Ms. Phiri: <br /> Condor Earth(Condor)is writing on behalf of Raymond Investment Corporation to acknowledge your letter <br /> dated August 10,2020 and to provide a revised figure showing proposed locations for the step-out borings <br /> to be drilled and sampled in advance of monitoring well installation(Figure 6A, attached). <br /> Proposed boring B51 will be drilled in the stormwater retention pond,contingent upon access by the drilling <br /> rig. If the drilling rig cannot safely drill on the pond floor due to shallow groundwater and/or soft ground <br /> surface,Condor and the drilling contractor may elect to drill and sample at that location using an hand auger <br /> and temporary well casing. Proposed step-out borings B52 and B53 will be advanced near the location of <br /> proposed monitoring well MW-7 and proposed borings B54 and B55 will be advanced near the location of <br /> proposed monitoring well MW-8, as shown on the attached revised figure. <br /> Boring B51 (retention pond)will be advance to first groundwater to collect a groundwater sample.Proposed <br /> step-out borings B52 through B54 will be advanced to a total depth of approximately 20 feet below ground <br /> surface(bgs)using a direct-push drill rig and continuous core soil samples will be collected for lithological <br /> identification. A grab groundwater sample will be collected from each step-out boring at first encountered <br /> groundwater,which we anticipate to occur at approximately 12 to 15 feet bgs, and sent to a State-certified <br /> analytical laboratory for analysis. Deeper groundwater samples may be collected at the discretion of a <br /> Condor professional geologist. <br /> Please feel free to contact me at(209) 938-1061 or via my mobile phone (209) 743-7443 should you have <br /> any questions regarding this request. �oN P GF <br /> O� <br /> Respectfully, 0��o�N �OWN <br /> CONDOR EARTH a <br /> No.6795 <br /> John P. Lane,PG#6795 TF OF CP, FOS <br /> Environmental Services Manager August 14, 2020 <br /> cc: Mr. Scott Malm, Malm Fagundes LLP, Stockton <br /> X:\Project\6000_pg\6847 Raymond Investments-Helena Chemical\Correspondence\FL 20200814 Letter Addendum to Work Plan 6847C.docx <br />