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RECEIVED Nov a 0 2012 ` co uNNc onG BRowN JR. Ew. CAL I 10-A ENVNMENTAL HEALTH MATTHEW RoCRIOJEZ Water Boards IP RMIT/SERVICES SECRET �oR ENVIRONMEME NTAL PFCTECIIUt. Central Valley Regional Water Quality Control Board 28 November 2012 Mr. Stephen Donell Fed Receiver, Inc. 12121 Wilshire Blvd., #1120 Los Angeles, CA 90025 LIMITED PHASE 11 SITE ASSESSMENT REPORT, 248 INDUSTRIAL DRIVE, STOCKTON, SAN JOAQUIN COUNTY Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff reviewed the 25 April 2012Limited Phase l/ Environmental Site Assessment Report (Phase 11 Report) and the 19 September 2012 Addendum to the Limited Phase 11 Environmental Site Assessment Report (Addendum) prepared on your behalf by Pinnacle Environmental Inc. (PEI). The Phase 11 Report presents results of an environmental assessment conducted at the industrial property located at 248 Industrial Way in Stockton, San Joaquin County, California (the Site). Previous environmental investigations conducted at the Site detected petroleum hydrocarbons in soil at concentrations up to 1,900 milligrams per kilogram (mg/kg or ppm). Based on these results and records of past Site activities, PEI conducted a soil, soil vapor, and groundwater investigation to determine whether additional pollution was present. Investigation of groundwater, which occurs at a depth of approximately 27 feet below ground surface, identified benzene at a concentration of 47 micrograms per liter (Ng/L) in sample SB-1002 and 1,2-dichloropropane (1,2-DCP) at a concentration of 31.6 pg/L in sample SB- 1006. These results exceed the maximum contaminant limit (MCL) for drinking water of 1 pg/L and 5 pg/L for benzene and 1,2-DCP, respectively. In addition, chloroform was detected in sample GW-3 at a concentration of 7.53 pg/L, exceeding the California Public Health Goal (PHG) of 1 pg/L. The soil investigation identified several areas with elevated heavy-end hydrocarbons (C23-C35), with detections of 33,000 mg/kg in soil at location SV-25 and over 48,000 mg/kg in soil at location SB-112. Several volatile organic compounds (VOCs) were identified in the soil sample collected from location SV-5, adjacent to the septic system, at concentrations below applicable screening levels. Sub-slab soil vapor samples were collected from 26 locations across the Site. All VOC detections were below applicable screening levels. No deeper vapor samples were collected, as the clay-rich soils reportedly prevented sufficient flow to collect a sample. KARL E. _ONGLEY SCD, P.E., CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER 11020 Sur Center Drive#200,Rancno Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley RECYCLED PAPER