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73�-• Eoau.a G. B..-JP. <br /> ,../': OavExxO <br /> MATrxE-RaoRIOYEz <br /> .......... 00 ExnPoxBexw PPo.emiox <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board RECEIVE® <br /> 10 April 2018 APR 13 20-18 <br /> ENVIRONMENTAL HEALTH <br /> Trevor Hartwell PERMIT/SERVICES <br /> Geocon Inc. <br /> 3160 Gold Valley Drive <br /> Rancho Cordova, CA 95742 <br /> SIEBOLD CONSTRUCTION, 820 S. AMERICAN STREET, STOCKTON, SAN JOAQUIN <br /> COUNTY, CASE #390394, EAR #R09-121 <br /> On 22 March 2018, the California Department of General Services (DGS) approved Budget <br /> Amendment 2 for environmental work associated with the Siebold Construction unauthorized <br /> petroleum release at 820 S. American Street in Stockton (Site). The approved Amendment 2 <br /> was submitted by DGS to Central Valley Regional Water Quality Control Board (Central Valley <br /> Water Board) staff on 9 April 2018. Amendment 2 approves a total budget of $66,626 to cover <br /> the following: <br /> • groundwater sampling; <br /> • soil assessment as proposed in GHD Inc.'s (GHD's) 27 September 2017 Workplan for <br /> Shallow Soil Evaluation— Evaluation of Direct Contact Risk (Work Plan); <br /> • Preparation of an Assessment Report and Closure Request; <br /> • preparation and distribution of a public notice Fact Sheet; and <br /> • destruction of remaining Site wells. <br /> Central Valley Water Board staff have the following comments: <br /> 1. Due to the fact that GHD's contract with DGS ended on 30 September 2017, Central <br /> Valley Water Board staff did not issue a letter approving the scope of work proposed in <br /> the Work Plan. The Work Plan proposed the following scope of work: <br /> Soil Sampling <br /> Borings Total Depth Depth Analysis <br /> (ft b s ftb s <br /> 7 Borings 10 5, 10 BTEX, naphthalene <br /> as yet unnamed <br /> BTEX=benzene,toluene, ethylbenzene,xylenes;ft bgs=feet below ground surface <br /> Now that DGS has approved budget Amendment 2, please implement the proposed <br /> scope of work, and by 17 August 2018 please submit a Site Assessment Report <br /> presenting results and recommendations. Please also include a comparison of shallow <br /> soil data to Direct Contact and Outdoor Air Exposure criteria presented in the State <br /> KARL E. LoNOLEY Sc D, P.E., CRAW I PAMELA C_ CREEDON P.E.. SCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rencba Cordova,CA 85870 1 www.watOrboards.ca.gov/CentralVal]By <br /> (,�PICYCLEa PPPEP <br />