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MONITORING AND REPORTING PROGRAM ORDER NO. R5-2015-0012-043 2 SAN JOAQUIN COUNTY PUBLIC WORKS SAN JOAQUIN COUNTY A total of eight underground storage tanks (USTs #1 through #8) have been removed from the Site. USTs #6 and #7 were removed sometime prior to 1979, and UST #5 (520 -gallon kerosene) was removed in 1991, though no removal reports have been located. Unauthorized Release Reports (URRs) were filed by San Joaquin County Environmental Health Department (SJCEHD) in March 1990 and June 1992 following tank testing. UST #3 was removed by Fisch Environmental in June 1995, with a 3rd URR filed by SJCEHD following its removal. In November 1998 Advanced GeoEnvironmental Inc. (AGE) removed USTs #1 (gasoline) and #2 (diesel) and replaced them with the current Site USTs, which retained the IDs of USTs #1 and #2. In March 1999, Tait Environmental Management removed UST #4 and abandoned -in-place UST #8. The area of highest petroleum hydrocarbon impact to soil and groundwater is around former USTs #3 and #4 and dispenser. Between March 2003 and December 2006, 1.73 gallons (0.29 pounds) of non - aqueous phase hydrocarbons (NAPH) was removed from monitoring well MW -1. A soil vapor extraction (SVE) and air -sparge (AS) pilot test was completed in June 2011 using SVE-1A, SVER-1 B, SVE-2A, SVE-213, and MW -1 as test wells, removing a total of 151.43 pounds of hydrocarbons. Between April 2012 and February 2013 dual-phase extraction (DPE) combined with AS removed a total of 2,068.3 pounds of hydrocarbons and 1,410 gallons of impacted groundwater. However, additional remedial efforts are needed to address residual petroleum hydrocarbons in groundwater. The Discharger proposes to use pilot -scale ozone injections to evaluate the long- term use of ozone to remediate the residual fuel hydrocarbon impact to soil and groundwater. The Discharger proposes to inject a total of up to 3 pounds per day of ozone (monthly maximum of 90 pounds) into seven (7) currently installed ozone injection wells (OW -1 through OW -7). The Discharger proposes to inject into one well at a time, cycling through all 7 wells. The injection duration in each well may be adjusted based on Site conditions. During the proposed pilot test, the Discharger will perform applicable monitoring, sampling and reporting. Progress remediation reports and results will be evaluated by Central Valley Water Board staff. LEGAL REQUIREMENTS 2. California Water Code (CWC) section 13267 states, in relevant part: (a) A regional board .... in connection with any action relating to any plan or requirement authorized oy this division, may investigate the quality of any waters of the state within its region. (b) (1) In conducting an investigation specified in subdivision (a), the regional board may require that any person who has discharged, discharges, or is suspected of having discharged or discharging, or who proposes to discharge waste within its