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0 <br /> GAVIN NlwsnM <br /> [:[]VIHN[1H <br /> C A L I F O R N 1■ J AH E 1)131 LIME NE I I I1 <br /> Water Boards <br /> n:rMi Hlni HH011 CHON <br /> Central Valley Regional Water Quality Control Board <br /> 2 May 2019 <br /> Juan and Elia Ruvalcaba TR Mr. John M. Leubberk <br /> 1404 North Monroe Street City of Stockton <br /> Stockton, CA 95203 425 North El Dorado Street <br /> Stockton, CA 95202 <br /> Mr. Michael Griffin <br /> St. John's Episcopal Church <br /> 316 North El Dorado Street <br /> Stockton, CA 95202 <br /> Additional Site Assessment Work Plan, Cancun Restaurant, 135 East Miner Street, <br /> Stockton, CA 95202 <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the Additional Site Assessment Work Plan (Work Plan) dated 7 March 2019, and the <br /> Groundwater Monitoring Report—Fourth Quarter 2018 (4Q2018 Report) dated <br /> 17 January 2019, both submitted by Advanced GeoEnvironmental, Inc. (AGE) on behalf of Mr. <br /> Juan Ruvalcaba for the Cancun Restaurant located at 135 East Miner Street in Stockton (Site): <br /> Groundwater monitoring wells are screened in two intervals. Interval "A" appears to extend from <br /> 20 to 40 feet below ground surface (ft bgs) and includes well MW-1A. Interval "B" extends to at <br /> least 60 ft bgs and contains well MW-1 B through MW-413 which are screened from 55 to 60 ft <br /> bgs. During the fourth quarter 2018, AGE detected 12,000 micrograms per liter (ug/L) TPH-G, <br /> and 404 ug/L benzene in shallow well MW-1A, and up to 7,100 ug/L TPH-G in interval B wells. <br /> Depth to water in well MW-1A was 16.72 feet below top of casing (ft btoc), and ranged from <br /> 16.71 to 18.35 ft btoc in interval B wells. AGE calculated a groundwater gradient of 0.0375 ft/ft <br /> towards the northeast in the B interval. Groundwater gradient and flow direction could not be <br /> calculated for the A intervals as there is currently only one A interval well at the Site. <br /> In the Work Plan, AGE proposes installation of two shallow wells, screened from 13 to 35 feet <br /> below ground surface (ft bgs), and advancement of 4 CPT borings. AGE proposes to advance <br /> the CPT borings to 100 ft bgs, and to collect depth discrete grab groundwater samples. AGE <br /> will submit grab groundwater samples for analysis for TPH-G, TPH as diesel (TPH-D), benzene, <br /> toluelen, ethylbenzene, total xylenes, naphthalene, methyl tert butyl ether (MTBE), di-isopropyl <br /> KARL E. LONGLEY SCD, P.E., GHAIR I PATRICK PULUPA, ESQ., EXEGUTWE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.waterboards.ca.govlcentralvalley <br /> Cj RECYCLEO PAPER <br />