ARCHIVED REPORTS XR0010405 - Laserfiche WebLink

Home Browse Search

T . ..,. I I soil and vegetation on an approximately 4.9 acre lot. The site boundaries are occupied by an eight-foot sheet metal fence. The two buildings consist of one cinder block building with a concrete slab floor, offices and service bays, located on W, Eleventh Street, and one wood framed building with corrugated tin siding and a concrete slab floor located near the center of the site. In addition to the buildings on-site, there is a water supply well on the site, a septic tank and leach field located between the two buildings on-site, and a suspected hydraulic lift located north and adjacent to the cinder block building in a concrete slab. No underground storage tanks (USTs) are known to currently exist on the property. The property is provided water by the well on-site, and sewage is handled by the septic tank and leach field. Electricity and natural gas are provided by Pacific Gas and Electric Company. A generalized site plan is included as Figure 2. METHODS OF INVESTIGATION In accordance with the authorized Proposed Scope of Work and Estimated Budget dated April 1, 1996, Smith Environmental personnel performed the following scope of work to complete a Phase II ESA for the purpose of assessing the existing physical state of soil on-site. Soil Sample Collection On April 1, 1996, Smith Environmental personnel divided the site into a grid with 16 sections. Using hand tools, 16 shallow test pits were excavated (one pit per section) to a maximum depth of approximately 2 feet below the ground surface. Following the excavation of each test pit, one discrete soil sample was collected into brass soil tubes using hand sampling tools. The filled soil -- sample tubes were capped at each end with Teflon tape and plastic end caps and place immediately on ice, During sampling activities, soils were field screened with a Photoionization Detector (PID) to measure volatile organics to help confirm the absence or presence of petroleum hydrocarbon constituents. Following sample collection, each pit was backfilled to the surface with native excavated soil, Hand sampling tools were washed with Alconox detergent and water, and rinsed with water between pits. Soil sample locations are shown on Figure 3. A copy of field notes is presented in Attachment A. Collected soil samples were transported to Argon Laboratories of Modesto, California, a state certified laboratory, and laboratory composited by a 2:1 ratio. The composited samples were analyzed for total recoverable petroleum hydrocarbons (TRPH) by EPA method 418.1; benzene, toluene, ethylbenzene and total xylenes (BTEX) by EPA method 503018020; and cadmium, chromium, nickel, lead, and zinc. Copies of Chains of Custody are presented in Attachment B. Soil Analyses and Results j Petroleum hydrocarbon constituents were detected at low concentrations in only two of the composite samples, SS-AB and SS-I3. Total petroleum hydrocarbons (TPH) as motor oil were detected in both samples at concentrations of 200 parts per million (ppm) and 120 ppm, respectively. Benzene and total xylenes were detected only in sample SS-AB at low {{ concentrations of 0.046 ppm and 0,016 ppm, respectively. Laboratory reports are included in 1 Attachment B. j W A967301REPORTSISUBREPAGc SMTH i