Laserfiche WebLink
GAVIN NEWSOM <br />GOVERNOR <br />CALPIORN-JARED BLUMENFELD <br />3ECRETAR" FOR <br />Nater Bards ENVIRONMENTAL PROTECTION <br />Ventral Valley Regional Water Quality Control Board <br />2 December 2020 <br />EGEID <br />DEC 14 2020 <br />Roger Hartley Roger Hartley NpRQNMENTAL HEALTH <br />P.O. Box 1692 2151 Country Club Blip �I IiT;�ERVICES <br />Manteca, CA 95336 Manteca, CA 95204 <br />BOULEVARD AUTOMOTIVE, 2151 COUNTRY CLUB BLVD, STOCKTON, SAN <br />JOAQUIN COUNTY, LUST CASE #390044 <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the report titled Groundwater Monitoring — Third Quarter 2020 (3Q20 GMR) <br />dated 28 October 2020, submitted on your behalf by Advanced Geo Inc. (AGI) for the <br />Boulevard Automotive underground storage tank (UST) petroleum release case at 2151 <br />Country Club Boulevard in Stockton (Site). In the 3Q20 GMR, AGI presents July 2020 <br />groundwater monitoring data for the Site. AGI recommends rescinding the Waste <br />Discharger Requirements (WDRs) related to Monitoring and Reporting Program No. R5- <br />2015-0012-0021 (MRP) effected 20 October 2016, and Amended Monitoring and <br />Reporting Program No. R5-2015-0012-0021-01 (Amended MRP) effected <br />5 September 2017. AGI also recommends preparing a work plan to evaluate the <br />efficacy of monitored natural attenuation. <br />The WDRs detailed the required monitoring related to hydrogen peroxide injection. AGI <br />injected a total of 2;755 gallons of a 5% hydrogen peroxide solution into Site wells IW -1 <br />through IW -10, DPE-1, and DPE-2 during five events between October 2018 and <br />January 2019. No remedial injections have been performed since January 2019. <br />Petroleum hydrocarbons in Site groundwater currently exceed thresholds established in <br />the State Water Resources Control Board's Low Threat Underground Storage Tank <br />Case Closure Policy (LTCP). Based on available Site data, benzene concentrations <br />exceed the LTCP Groundwater -Specific Class 4 threshold of 1,000 micrograms per liter <br />(ug/L) in twelve Site wells, seven of which exceed 3,000 ug/L. Current groundwater <br />data is summarized in Table 1 below. <br />KARL E. LONGLEY SCD, R.E., CHAIR I PATRICK DULUPA, ESU., EXECUTIVE OFFICER <br />11020 Sun Center Drive #200. Rancho Cordova, CA 95670 1 www.watert)oards.ca.gov/centraivallev <br />