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• Mr. Steve Sasson Project 22794-100.001 <br /> August 10, 1998 <br /> Page 5 <br /> vicinity of the Port of Stockton fuel distribution facilities indicates that the secondary <br /> MCLS for TDS, chlorides and sulfate are exceeded (Pacific Environmental Group, <br /> August 1996, Corrective Action Management Plan). Sodium levels also range from <br /> 220 to 660 mg/kg. <br /> Regional Groundwater Impacts <br /> TPHD detected in HydroPunch samples collected to the north and upgradient of the <br /> former Safeway UST locations and in monitoring well MW-6 suggest other sources of <br /> groundwater impact are present in the site vicinity. Numerous diesel USTs are located in <br /> the site vicinity, and sewer mains present beneath Navy Drive have release coliform <br /> bacteria to the first-encountered water-bearing zone In addition, the Santa Fe Pacific <br /> petroleum pipelines are located within the utility easement along the southern edge of <br /> Navy Drive, west of the Safeway site, and reportedly turn southward along <br /> Fresno Avenue, approximately 1,500 feet west (upgradient of the site). Utility markings <br /> observed during November 1997 indicated the petroleum pipelines continue east of <br /> Fresno Avenue towards the Safeway site. The pipelines transnut fuel products to and <br /> from petroleum distribution terminals located at the Port of Stockton, approximately <br /> 1% miles northeast of the Safeway site. <br /> Heating oil for the military housing formerly located on the property would have been <br /> transmitted by pipeline from the distribution terminals located at the Port of Stockton. <br /> The pipelines represent an additional source of soli and groundwater impact. <br /> The USTs, sewer mauls, and petroleum pipelines represent potential sources of diesel fuel <br /> impacts to soil and groundwater. UST case sites located upgradient of the former <br /> Safeway facility are shown in Figure 1 and are discussed in the following paragraphs. <br /> PDM Strocal, 2324 Navy Drive. This site is located approximately 6,000 feet west <br /> (upgradient) of the former Safeway facility. Diesel impacts to soil and groundwater were <br /> assessed in 1987 through 1992. At the time of the UST removal, TPHD was reportedly <br /> detected in a water sample collected from the excavation at 2,400 microgram per <br /> liter (gg/L). Two monitoring wells installed at the site were sampled and did not contain <br /> detectable concentrations of TPHD. The SJCPHS issued a case closure letter dated <br /> March 1996 Neither well was installed to the east (downgradient) of the former UST <br /> location <br /> A W Haves, 2005 Navy Drive. This site is located approximately 3,500 feet west <br /> (upgradient) of the former Safeway facility. This is an open UST case involving release <br /> • from a 10,000-gallon diesel UST. The UST was removed and the facility is participating <br /> SAONNPJZ2794\27941000 1CS-9811=smer'8 Emcon <br /> Rev 0.8110/98 <br />