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Soil and Groundwater Investigation Report Catellus Property September 2006 • The Interland Corporation leaking underground storage tank(LUST)case number 390518 at 8715 West Grant Line Road,which appears to have been located adjacent to the site on the east side of Byron Road. The quantity of gasoline leaked was reported to be 0 gallon,and the case was closed on June 21, 1990. Although the EDR report listed a few other sites within 1 mile of where hazardous substances or wastes had been used,managed, discharged, or spilled,all are located beyond'/2 mile,down gradient and down slope of the site. The EDR report is provided as Appendix B. November 2005 SBC Underground Communications Line Installation. In November 2005, immediately east of the Catellus site at the intersection of West Grant Line Road and West Byron Road, HCI,Inc. (HCI)of Turlock was excavating a trench for the installation of a SBC underground telecommunications line. HCI encountered affected soil and contacted Chevron Pipeline Company. Two trenches were being excavated: one larger trench approximately 80 feet long and approximately 12 feet deep on the east side of the UPRR,and a shorter trench approximately 10 feet long and 10 feet deep on the west side of the UPRR tracks and West Grant Line Road. To install the communications line,a horizontal boring was made(using a jack—and-bore rig)underneath the rail road connecting the two trenches. Laboratory analysis of groundwater samples collected by SAIC indicated TPH quantified as crude oil (TPHc,carbon range of CIO-C36)at a concentration of 12,000 micrograms per liter(µg/L)and PAHs at concentrations ranging from 0.02 to 3.0 micrograms per liter(µg/L). A stockpile sample contained TPHc at a concentration of 1,700 milligrams per kilogram(mg/kg)and PAH constituents at concentrations ranging from 0.018 mg/kg to 1.4 mg/kg. BTEX were not detected in any soil or groundwater sample. Additionally,one soil and one groundwater sample were sent to Chevron Energy and Technology Company for fingerprint analyses. The lab results reported a TPHc concentration of 131 mg/kg in the soil and 732 pg/L in the groundwater. Fingerprint analysis revealed that the hydrocarbons in the samples were extremely biodegraded San Joaquin Valley crude oil. 3. SCOPE OF WORK In order to define the extent of affected soil and groundwater at the Catellus site, SAIC conducted the following tasks,as described in the work plan: • Completed pre-field,project setup,and strategic planning activities,including the site-specific Health and Safety Plan,the Journey Management Plan,and the clearance of subsurface utilities. • Conducted a search of DWR files to obtain information on water supply wells and prepared a summary table,which is provided in this report. • Advanced 20 primary and 11 step-out borings from which soil and groundwater samples were collected and tested by Lancaster Laboratories in Lancaster,Pennsylvania for the constituents of concern. Soil samples were analyzed for: TPHc by U.S.Environmental Protection Agency(EPA) EPA Method 8015 Modified;BTEX by EPA Method 826013; and PAHs by EPA Method 8270C Selective Ion Monitoring(SIM). Groundwater samples were analyzed for:BTEX by EPA Method 826013;TPH quantified as diesel(TPHd,carbon range CIO to C25)by EPA Method 8015 Modified with and without silica-gel cleanup;PAHs by EPA Method 8270C SIM; and Total Dissolved Solids(TDS)by EPA Method 160.1. Thirty-one borings were installed to delineate the lateral extent of affected soil and groundwater. Of those borings,in order to delineate the vertical extent of affected soil,borings SB-1, SB-5, SB- O, SB-8, SB-15,and SB-20 were advanced through the zone of affected soil until crude oil was no ANNEWAr SO 3 From Science to Solutions-