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1.2 Previous Investigations Previous investigations have been conducted at the former Parmar Texaco site since 1988. Figures 5 to 11 are maps or cross-sections that depict the information collected from PHSEHD file reviews. Tables 1 to 9 are tabulations of data from historic investigations conducted to date. Six former underground gasoline storage tanks (UST) and two dispenser islands were located at the former Parmar Texaco property when it was operating as a service station (Figure 5). The last time the station was operating as a service station was pre-1986 when the site was known as Lerner Texaco and/or Parmar Texaco. Local residents knowledgeable with the history of this business in the city of Lodi have indicated that the property was a retail gasoline service station from approximately 1950 to 1983. After about 1983 the site has reportedly been used mainly as an automotive repair shop or tire repair store but continued with fuel sales until late 1985. The site has also been known as J&A Auto Repair and Corona's Fixin Tires. The site has an unclear history of UST operatorship. Apparently one of the last UST operators was RAMCON. Immediately prior to the UST removals in 1988 the property was owned by Mr. And Mrs. Carl Yearing and had been operated by a tenant or lessee doing business under the operating name of Parmar Texaco. The last known operator of fuel sales at the site was RAMCON. RAMCON submitted an application to PHSEHD to remove the six USTs on February 2, 1988. DST's identified at the site that were removed during February 1988 included the following: 1 550 gallon waste oil tank 1 10,000 gallon gasoline tank 2 4.000 gallon gasoline tanks 1 3,000 gallon gasoline tank 1 8,000 gallon gasoline tank The DST's were removed by RAMCON on February 5, 1988 and reportedly transported to H&H Ship Service Company, San Francisco under hazardous waste manifest. All dispensers and underground piping were also reportedly removed. Soil samples were reportedly collected from underneath each of the DST's and transported under chain of custody document to GT Environmental Laboratories in Concord, California for analysis as follows: USEPA Test Method 8020/8015m/5030 and 8010 for volatile organic compounds. In addition.the soil samples were reportedly analyzed for EDB and total lead (Applied Geosystems, 1988). All work was reportedly conducted under the regulatory oversight of PHSEHD. Analytical laboratory reports from GT Environmental Laboratories for the soil samples submitted for f analysis were all reported to contain elevated concentrations of volatile organic compounds (VOC's) beneath each of the DST's. Maximum concentrations reported for the samples included: benzene (14 mg/kg); toluene (200 mg/kg); ethylbenzene (130 mg/kg); xylene (850 mg/kg); TPH-gasoline (4,700 mg/kg) and miscellaneous hydrocarbons (C4 to 12) (3,400 Parmar\Site Assessment Workplan\02152018.wpd 2 I