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.4" Emma G. BROWN JR. DOVIIPPICIR Water Boards Central Valley Regional Water Quality Control Board liNNITHEM FlOORICIUE2 SECHNTAXT INVITIOMMBITAL PACTECTION 18 June 2015 Greg McIver The Source Group, Inc. 751 Laurel Street, Suite 722 San Carlos, CA 94070 REMEDIAL ACTION WORK PLAN, FORMER COUNTRYSIDE MARKET, 10848 COPPEROPOLIS ROAD, STOCKTON, SAN JOAQUIN COUNTY, EAR ACCOUNT CASE # R10-129 The California Regional Water Quality Control Board — Central Valley Region (Central Valley Water Board) staff reviewed the Air Sparging Pilot Test Related Activities Report and Remedial Action Work Plan (Work Plan), dated 30 April 2015 prepared by The Source Group, Inc. (TSGI). In the Work Plan, TSGI proposed installation of an air sparging (AS) and soil vapor extraction (SVE) treatment system at the Former Countryside Market in Stockton. In January 2015, TSGI conducted an AS and SVE pilot study that confirmed the technical feasibility of implementing an AS and SVE as an effective remedial option. Four soil borings were advanced and completed as 2" diameter air sparging wells AS-1 and AS-2, observation well OBS-1 and soil vapor extraction well VW-1. AS-1 and AS-2 were screened 110' to 115' below ground surface (bgs). OBS-1 was screened 80' to 120' bgs, and VW-1 was screened 30' to 60' bgs. Depth to groundwater was approximately 99' bgs. Soil samples were collected at 5' intervals for chemical analyses, field screening, and lithology to confirm that the design of the SVE/AS treatment system was appropriate. Soil was analyzed for Total Petroleum Hydrocarbons as Gasoline (TPHg) by United States Environmental Protect Agency (USEPA) Method 8015B Modified. Benzene, Toluene, Ethylbenzene, Xylenes, the five (5) fuel-oxygenates Di Is° Propyl Ether (DIPE), Ethylene Tert Butyl Ether (ETBE), Methyl Tert Butyl Ether (MTBE), Tertiary Amyl Methyl Ether (TAME), and Tertiary Butyl Alcohol (TBA), lead scavengers 1, 2-Dichloroethane (1, 2-DCA) and Ethylene Dibromide (EDB), and Naphthalene by USEPA Method 8260B. Soil results from borings AS-2, VW-1, and OBS-1 (AS-1 was not sampled) are given in milligrams per kilogram (mg/kg) in Table 1: Well TPHgl Benzene Toluene Ethybenzene Xylenes Naphthalene EDB2 1,2-DCA AS-2-95' <1.0 0.0031 0.026 0.016 0.09 0.014 0.0026 0.044 VW-1-40' 4,500 <5.0 220 130 720 96 <5.0 <5.0 VW-1-60' 3,700 <2.0 160 100 570 61 <2.0 <2.0 OBS-1- 20' 140 <0.10 <0.10 0.1 1.8 6.8 <0.10 <0.10 OBS-1- 55' 1,600 <0.50 23 26 137 23 <0.50 <0.50 OBS-1- 106' <1.0 <0.001 0.0061 0.0026 0.014 0.0032 <0.001 <0.001 Kum_ E. Lamour Ed). P.E., ciima I PAMELA C. Crierom . EXECUTIVE °FACER 111132C1 Sun Carter Dave /200. Rends° Carcicrea GA 06070 Iwkra.waterboarcis.oa.govioartralvelley 0 RECYCLED PAPER