WORK PLANS - Laserfiche WebLink

Home Browse Search

Health and Safety Plan 1319 & 1327 South Madison Street, Stockton, CA 432770 and volatile organic compounds (VOCs). In addition, the soil sample collected near the inground lift will also be analyzed for PCBs and the soil samples in the unpaved areas north and west of the Site building will be analyzed for Resource Conservation and Recovery Act (RCRA) 8 Metals. Task 2: Soil Gas Probe Installation and Sampling: Four soil borings will be completed as temporary gas probes. The probe will be constructed using 0.25-inch diameter Teflon tubing connected to a 1-inch plastic probe tip. The probe tip will be placed in the middle of an annular filter pack composed of Lonestar No. 3/12 sand placed between 4.5 and 5.5 feet bgs. The probe will then be sealed with a 1-foot layer of dry granular bentonite followed by hydrated granular bentonite to grade. Water will be added at the surface to hydrate the upper portion of the granular bentonite to ensure proper sealing during sampling activities. Sampling of soil gas will be conducted by vacuum testing and purging the wells and by using helium as a tracer compound. The soil gas samples will be collected through a calibrated flow controller and into one-liter laboratory-supplied evacuated canisters. Soil gas samples will be analyzed for VOCs using US EPA Testing Method TO-15. 1.2 Site Description and Chemicals of Concern The Site, which consists of a commercial office building and an automobile service building, is located on the northwest side of Doctor Martin Luther King Junior Boulevard and South Madison Street in a mixed commercial and residential area of Stockton, California. AEI recently completed a Phase I Environmental Site Assessment (ESA) for the property, as documented in our report dated January 28, 2021. The following Recognized Environmental Conditions (RECs) were identified. • the Site building located at 1319 South Madison Street has been utilized as an auto repair business since 1949. Based on the use of the Site for auto repair operations for 72 years (which included many years of operation during a time when regulatory oversight with respect to hazardous substance/petroleum product storage/waste generation would not have been in place), and noted violations/impacted soil removal, the auto repair operations are representative of a REC. In addition, an inground hydraulic lift was noted. Due to the age of the equipment, the integrity of the equipment during its former operation is unknown; therefore, the potential exists that a release of hydraulic fluid which may have contained polychlorinated biphenyls (PCBs) has occurred on site. Therefore, the presence of the former hydraulic lift represents a REC. • The immediately adjoining/upgradient property at 163 French Camp Turnpike (to the northeast, beyond road, approximately 50 feet) is listed as, Aalhini & Stefani Gas and Aalimbini & Baroni (Gasoline and Oil Service Stations) in 1940 and 1946. This property may pose a threat for vapor phase contaminant migration to the Site and AEI recommends further investigation to assess whether a vapor phase migration concern exists at the Site. Contaminants of concern are petroleum and chlorinated VOCs, PCBs, and metals. Page 2