ARCHIVED REPORTS XR0005572 - Laserfiche WebLink

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. 1.0 INTRODUCTION Wright Environmental Services, Inc (Wright) has prepared this Environmental Site Investigation Report for submittal to the San Joaquin County Public Health Services Environmental Health Division (PHSIEHD) The project scope of work was completed in accordance with Wright's Work Plan, Environmental Site Investigation, dated April 21, 1998 1 1 Site Description The subject site is located at 1040 Moffat Boulevard in the city of Ripon and county of San Joaquin, California (Figure 1) The site is an operating cement mixing plant, situated east of Jack Tone Road between Moffat Boulevard and State Highway 99 One, 4,000-gallon diesel underground storage tank (UST) was previously removed from the northwest part of the site and one, 500-gallon gasoline UST was abandoned on the north side of the plant building (Figure 2) 12 Previous Work On April 14, 1995, SEMCO removed one, 4,000-gallon, steel, diesel UST from the north side of the site The PHSIEHD inspector noted "obvious signs of contamination and odor" Two soil samples (TK-N and TK-S) were collected from beneath the ends of the UST, at a depth of 12 feet below ground surface (bgs) The sod sample collected from beneath the north end of the UST (TK-N) contained 4,100 milligrams per kilogram (mg/kg) of Total Petroleum Hydrocarbons (TPH)- as-diesel and low concentrations of ethylbenzene (0 41 mg/kg) and xylenes (1 3 mg/kg) Benzene, toluene, TPH-as-kerosene and TPH-as-motor oil were not detected in this soil sample The soil sample collected from beneath the south end of the UST contained only 4 2 mg/kg of TPH-as-diesel Benzene, toluene, ethylbenzene, xylenes (BTEX), TPH-as-kerosene, and TPH- as-motor oil were not detected in this soil sample In June 1996, under contract to Rajappan & Meyers, Inc , Michael Brandman Associates completed an Initial Site Assessment (ISA) for the Route 99/Jack Tone Road Interchange Reconstruction Project The ISA concluded that the site required a Preliminary Site Investigation (PSI) to evaluate potential sod contamination in the vicinity of the interchange Subsequently, Rajappan & Meyers, Inc contracted with URS Greiner, Inc to complete the PSI During the week of May 9, 1997, URS Greiner, Inc completed the PSI The scope of the PSI included the drilling of 4 soil borings on the Nelson Ready-Mix site Soil and groundwater-grab samples were collected for analysis from each of the 4 on-site soil borings Soil and groundwater- • 2