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���s a�~ � <br /> ~ ,=� <br /> ^^^~~^~^ m~�" "= <br /> o " � <br /> y,� '~ <br /> YYalcI Boards <br /> -------------- <br /> Central Valley <br /> ��� <br /> Centna| Va|1ey Regional Water Quality Control Board <br /> 17December 2018 <br /> Ralph Lee White Peter Bui & Kimberly Hoang <br /> 2201E. 8mStreet 40U4K4oddiaCircle <br /> Stockton, CAR52O8 Stockton, CA952O8 <br /> RALPH'S SC3UARE, 2122 S. AIRPORT WAY, STOCKT0N' SAN JQAQU{N COUNTY, CASE# <br /> 390995 <br /> � <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board)staff reviewed the � <br /> Off-Site Assessment Work Plan (Work Plan)dated 30 November 2018, submitted by Advanced ' <br /> GeoEnvironmental Inc. (AGE)for the Ralph's Square unauthorized petroleum release at 2122 <br /> S.Airport Way inStockton(Site)` (n-the Work Plan, AGE proposes toinstall two monitoring wells <br /> off-Site to the east to delineate the lateral extent of hydrocarbon impact to groundwater <br /> downgnodientofthe Site. The two monitoring wells are proposed asfollows: <br /> Soil Sa pling Well Sampling <br /> Total Depth Screen Interval <br /> Depth Analysis Frequency <br /> 50 25-50 5ft intervals from 5ft Lithologic Quarterly for <br /> to Total Depth logging only 4 quarters <br /> ft bgs=feet below ground surface <br /> Central Valley Water Board staff concurs with the proposed scope of work, with the following <br /> comments: <br /> 1. Central Valley Water Board staff typically request that monitoring wells which intersect the <br /> water table baconstructed with a 154bntscreen interval with approximately 5feet above and <br /> 1Ofeet below the water table. However, depth towater atthe Site has increased <br /> approximately 17 feet in the past 16 years, and has fluctuated greatly in the past 4 years <br /> (from 25.70to33.B7feet below top ofcasing). Ansuch, while the proposed screen length of <br /> 25 feet is excessive, a longer than usual screen interval is reasonable at this Site. <br /> Please install these wells with 20 feet of screen, with approximately 5 feet above and 15 feet <br /> below the water table. The actual installed screen depth should bobased ondepth towater <br /> and subsurface conditions observed during installation. <br /> 2. As not specified in the Work Plan, please wait a minimum of 48 hours after installation to <br /> develop the monitoring wells. <br /> KARL c Lv"GLeuma. ps'"H * / p^=1C°pv"r+ ESU_ EAEG""VE OP,IcEr <br /> .mmStir,m".etDrive:2m`m""""o°"m."n^o,om . "==.°^""m"`".,""/cen'"*"/lay <br />