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Limited Site Investigation � ferracon <br /> Vacant Property I Tracy, California <br /> May 26, 2023 1 Terracon Project No. NA197074B <br /> • "A total of twenty-nine (29) push probes were advanced during the field <br /> activities. A total of twenty-two 4-point composite soil samples, 26 discrete soil <br /> samples and 4 groundwater samples were submitted for chemical analyses for <br /> purgeable and extractable petroleum hydrocarbons and benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) compounds. Twenty-five (25) shallow probes <br /> were advanced to total depths ranging from approximately 8 to 24 feet below <br /> ground surface (bgs). Four deeper groundwater push probes were advanced to <br /> total depths ranging from 44 to 58 feet bgs. Groundwater was noted <br /> approximately 43 feet bgs in these four deeper borings. <br /> A summary of Kleinfelder's findings are summarized as follows: <br /> • Twelve discrete soil samples were collected and analyzed from perimeter push <br /> probe borings at depths ranging from 5 to 43 feet bgs. Based on this data, it is <br /> Kleinfelder's opinion that petroleum impacted soil has not migrated laterally a <br /> significant distance beyond the footprint area. Please note this finding does not <br /> include potential soil vapor migration of volatile compounds, since soil vapor <br /> sampling was not conducted as part of this assessment. <br /> • A total of four grab groundwater samples were collected, one in the footprint area <br /> and three from perimeter locations. Relatively low concentrations of petroleum <br /> constituents were detected in two of the four groundwater samples collected. The <br /> levels detected at the depths (first encountered groundwater) and locations in <br /> groundwater at the site were below state and federal Maximum Contaminant <br /> Levels (MCLs) for drinking water. The extent and distribution of hydrocarbons in <br /> groundwater is unknown at this time. Based on the relatively low levels detected, <br /> and since applicable petroleum constituents are below drinking water standards <br /> (MCLs), Kleinfelder at this time does not recommend clean-up or additional <br /> groundwater monitoring activities related to petroleum constituents detected in <br /> groundwater. <br /> • Kleinfelder anticipates that approximately 47,000 cubic yards of soil was impacted <br /> by petroleum constituents. Please note, onsite stockpiles of petroleum impacted <br /> soil from Chevron's clean-up activities are not included in this estimate. <br /> Kleinfelder anticipates remedial excavation depths will range from 5 to 13 feet <br /> bgs." <br /> According to Kleinfelder's October 25, 2005 Work Plan/Scope of Work the following were <br /> proposed; groundwater monitoring well installation, soil excavation observation, <br /> confirmation sampling and analysis, and human health risk evaluation. <br /> Facilities I Environmental I Geotechnical I Materials 2 <br />