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Pacific Coast Recreation - 3 - 12 November 2020 <br />Aka Cohn Property <br />3755 Mumford Avenue <br />Stockton, San Joaquin County <br />laboratory analysis. However, the previous descriptions of soil sampling both <br />state sampling will start at 50 ft bgs, not 40 ft bgs. <br />Please note, in a letter dated 10 December 2019, Central Valley Water Board staff <br />concurred with the scope of work presented in Downgradient Well Installation Work <br />Plan Addendum (2019 Work Plan) submitted to Geotracker on 15 October 2019. The <br />scope of work in 2019 Work Plan combined with the approved scope of work presented <br />in the Downgradient Well Installation Work Plan Addendum, Shallow Soil Sampling <br />Work Plan, and Updated Soil Analytical Data Set (2017 Work Plan) dated 11 May 2017, <br />were designed to complete lateral and vertical delineation of groundwater at the Site. <br />The proposed additional wells would be screened from 60 to 80 ft bgs, 85 and 95 ft bgs, <br />or 135 to 145 ft bgs, and shallow grab groundwater samples were proposed. <br />The scope of work presented in the Addendum does not appear to be adequate to <br />complete lateral and vertical delineation of groundwater. The data gaps that the 2017 <br />Work Plan and 2019 Work Plan identified remain and need to be addressed, and should <br />be included in the work plan due 31 January 2021. <br />If you have any questions or concerns, please contact me via phone at (916) 464-4792 <br />or via email at vera.fischer@waterboards.ca.gov <br />Vera Fischer, P.G. <br />Engineering Geologist <br />Christopher Flower, P.G. 8585 <br />Senior Engineering Geologist <br />cc: Technical Staff, State Water Resources Control Board, Sacramento <br />Technical Staff, San Joaquin County Environmental Health Department, Stockton <br />Mr. George Converse, Apex Envirotech, Inc. Gold River <br />