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DEC 14 202E <br />sp_00`30110 <br />i 4s� GAVIr; NEWuGM <br />GOVERNOR <br />_— TAL HEALTH '� JARED BLUMENFELD <br />)XIater Boards EN�IIRONMEN IC SECRETARYC)NME FDP <br />r� ENVIRONMENTAL PROTECTION <br />QE \MITISEF <br />Central Valley Regional Water Quality Control Board <br />2 December 2020 <br />Joshua Hernandez Zavala <br />San Joaquin County Dept of General Services — Capital Projects <br />44 N. San Joaquin Street #590 <br />Stockton, CA 95202 <br />RESPONSE TO FEASIBILITY STUDY, HUMAN SERVICES AGENCY, 145 S. SUTTER <br />STREET, STOCKTON, SAN JOAQUIN COUNTY, CASE# 390296 <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the Feasibility Study (Study) dated September 2020, submitted on your behalf by <br />Weston Solutions Inc. (Weston) for the Human Services Agency underground storage tank <br />(UST) petroleum release case at 145 S. Sutter Street in Stockton (Site). In the Study, <br />Weston evaluates Site conditions against criteria established in the State Water Resources <br />Control Board's Low Threat Underground Storage Tank Case Closure Policy (LTCP), and <br />presents the results of a Sensitive Receptor Survey identifying nearby water supply wells. <br />Weston also evaluates the feasibility and cost effectiveness of various remedial <br />approaches, as summarized in Table 1 below. <br />Table 1 — Summary of Evaluated Remedial Options <br />Alter- <br />Target <br />Proposed <br />WDR <br />Injection <br />No. of <br />Injection <br />native <br />al <br />al Type <br />Type <br />Treatment <br />Remedial <br />Permits <br />Method <br />Injection <br />Depth <br />Area <br />Injectant <br />Required <br />points <br />ft b s <br />In -Situ <br />PermeOx <br />Direct <br />1 <br />Bio- <br />MW -2 <br />UltraA <br />Yes <br />Push <br />4-10 <br />15-45 <br />remed- <br />(400 ft2 area) <br />- OR - <br />(both) <br />Borings <br />(on grid) <br />iation <br />BOS-200B <br />In -Situ <br />MW -2, MW -2A, <br />PermeOx <br />Direct <br />2 <br />Bio- <br />MW -7, area <br />Ultra <br />Yes <br />Push <br />4-10 <br />15-60 <br />remed- <br />between MW -2 <br />- OR - <br />(both) <br />Borings <br />(on grid) <br />iation <br />and MW -7 <br />BOS-200a <br />MW -2, MW -2A, <br />Direct <br />3 <br />ISCO <br />MW -7, area <br />Potassium <br />Yes <br />Push <br />4-10 <br />15-60 <br />between MW -2 <br />Persulfate <br />Borings <br />(on grid) <br />and MW -7 <br />ISCO= in-situ chemical oxidation; ft bgs= feet below ground sulfate; ft2= square feet <br />A= PermeOx Ultra: calcium peroxide -based reagent <br />B= BOS-200: activated carbon inoculated with microorganisms, nutrients, and electron <br />acceptors such as nitrate/sulfate <br />C= Coverage under Order R5-2015-0012, Waste Discharge Requirements General Order for <br />In -Situ Groundwater Remediation and Discharge of Treated Groundwater to Land <br />KARL E. LONGLEY ScD., P.E., CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br />11020 Sur, Center Drive 11120C, rancho --ordova, CA 95670 i www.waterboards.ca.gov/centralvalley <br />