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fmcon _ 1433 North Market Boulevard •Sacramento,California 95834-1943• (916)928-3300• Fax(916)928-3341 Ulf ENVIRONMENTAL HEALTH DIVISION 304 E.Weber Ave.Third Floor P. O. Box 388, Stoc on CA 95201-0388 Approved Denied ❑ January 27, 1997 Conditions QOJJ roject 22605-101.001 huts 1W k- 3 4- ate by 4ej S- • ('1e Mr. Travis Bryant Interstate Brands Corporation 12 East Armour Boulevard Kansas City, Missouri 64111 Re: Workplan to Conduct a Subsurface Investigation at the Former Dolly Madison Facility, Located at 1426 South Lincoln Street, Stockton, California Dear Mr. Bryant: At the request of Interstate Brands Corporation (IBC), EMCON has prepared this workplan to conduct an additional subsurface investigation at the subject site (see Figure 1). The subsurface investigation will consist of drilling one soil boring beneath the former underground storage tank (UST). The purpose of this investigation is to evaluate the vertical extent of residual hydrocarbons previously detected beneath the UST. In the event that further assessment is warranted based on field observations during the drilling of the initial soil boring, EMCON will drill two additional soil borings. BACKGROUND The site is located approximately 200 feet south of the intersection of Charter Way and Lincoln Street. On July 29, 1988, SEMCO of Modesto, California observed the removal of a 1,000-gallon UST. Based on analytical results of soil samples collected from beneath the former UST, residual hydrocarbons were present. Total petroleum hydrocarbons as gasoline (TPHG) was detected at a concentration of 95 parts per million. Benzene and total petroleum hydrocarbons as diesel (TPHD), kerosene, and motor oil were below laboratory detection limits. In the vicinity of the subject property is a former ARCO Service Station, a Chevron Service Station, a Texaco Service Station, the Transmission Shop, and a former Colombo Bakery, which all have had previously or currently have USTs (see Figure 1). Based on data collected from subsurface investigations performed at the former ARCO Service Station, the Chevron Station, the Transmission Shop, and the Texaco Service Station (located at the corners of Charter Way and Lincoln Street), residual and dissolved hydrocarbons have been detected beneath these facilities and a commingled plume exists beneath Charter Way and Lincoln Street. The groundwater flow direction near the intersection has generally been toward the northeast. SACNN.\PJZa605\260510l0.l AB-94VIb:2