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Notice of Applicability R5-2015-0012-073 - 3 - 31 May 2022 Human Services Agency 145 South Sutter Street Stockton, San Joaquin County Tank Capacity Contents Location When Soil Gallons Removed Removed Southeast corner of Site Approx. 8 800 Unknown' building 1968 cubic April yards in Southeast corner of Site 1988 vicinity of 9 800 Unknown' building USTs 1-3 & 6-9 10 500 Fuel Oil Beneath the north August -- sidewalk 1989 11 600 Unknown' Beneath the southeast corner of the sidewalk 12 600 Unknown' Beneath the southeast corner of the sidewalk January 13 600 Unknown' Beneath the southeast 2010 corner of the sidewalk 14 600 Unknown' Beneath the southeast corner of the sidewalk '= partially filled with sand; San Joaquin County filed an Unauthorized Release Report (URR) with San Joaquin County Environmental Health Department in September 1988 following removal of USTs 1 through 9. In December 1988, Weston advanced twelve borings (BH-1 through BH-12) and installed three groundwater monitoring wells (MW-1 through MW-3). Wells MW-1 and MW-3 initially contained only low concentrations of hydrocarbons, but MW-2 initially contained up to 59,000 micrograms per liter (ug/L) total petroleum hydrocarbons as gasoline (TPHg) and 28,000 ug/L benzene. Between 1988 and 2019, Weston installed 12 groundwater monitoring wells (MW-1 through MW-10, MW-2A, MW-3A), 2 soil gas monitoring wells (SV-1, SV-2), and 23 soil and groundwater borings (BH-1 through BH-14, CPT-1 through CPT-4, CB-1 through CB-5) to assess the extent of the Site release. San Joaquin County destroyed two of the monitoring wells in 1989 and 1995. Three additional monitoring wells were destroyed in 2010. Active remediation has not been performed since the excavation of impacted soil in 1988. The BOS-200 product includes powdered activated carbon medium along with micro and macro nutrients, terminal electron acceptors such as nitrate and sulfate, and a blend of facultative microorganisms that are designed to function in both aerobic and anaerobic environments. The activated carbon in the BOS-200 is designed to trap or adsorb petroleum hydrocarbons, and ingredients such as bacterial cultures and terminal electron acceptors are designed to facilitate biodegradation of these trapped hydrocarbons.