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1 <br /> 1• ACTIVITIES JANUARY THROUGH APRIL 1992 <br /> • Monitoring wells were gauged and sampled 30 Apra 1992 (Figures la and lb). <br /> • An Authority to Construct permit (permit numbers 91-395 and 91-396) was <br />' received from the Unified Air Pollution Control District allowing the installation of <br /> the proposed air stripper, soil vapor extraction system, and catalytic oxidation <br /> off-gas abatement device. <br />' • A notice of public hearing, to be held 26 June 1992, was posted at the Stockton <br /> City Hall and Post Office giving notification that there will be a public hearing <br /> concerning granting Exxon Company, U S.A authorization to discharge treated <br /> water under the National Pollution Discharge Elimination System. <br />' • A representative from EA Engineering, Science, and Technology met with the <br /> Stockton Department of Municipal Utilities to evaluate the expected quality and <br /> quantity of water to be discharged into the storm sewer system <br /> 2. PLANNED ACTIVITIES MAY THROUGH AUGUST 1992 <br />' • Monitoring wells were gauged and sampled 13 August 1992 (Figutes 1a d lb). <br /> 3. PLANNED ACTIVITIES SEPTEMBER THROUGH NOVEMBER 1992 <br />' • Monitoring wells will be gauged and sampled November 1992. <br />' 4. DEFINITION OF LIQUID-PHASE HYDROCARBONS <br />' A measurable thickness of liquid-phase hydrocarbons (LPH) was found only in wells RW3 <br /> and V4 on 13 August 1992. Well RW3 contained 0.39 feet of LPH, an increase of 0.25 feet <br /> from when it was last measured on 28 January 1992. LPH was measured in well V4 at <br />' 0.07 feet, whereas a sheen had been observed on 28 January 1992. <br />' S. DEFINITION OF DISSOLVED CONSTITUENT PLUME <br /> Groundwater was sampled on 30 April and 13 August. On both dates, monitoring wells <br /> MW 1—MW 10 were not sampled because either they did not contain enough water to properly <br /> purge and sample or they were dry. Samples were analyzed for Total Petroleum Hydrocar- <br /> bons as gasoline (TPH-g) by DHS-modified EPA Method 8015 and for benzene, toluene, <br />' ethylbenzene, and xylenes (BTEX) by EPA Method 8020. Analytical results for the August <br /> sampling are summarized in Table 2 and cumulatively summarized in Table 3 along with <br /> 73942(1)IQ492/X 4 1 <br />