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III i � Project No 59080-06-02 May 5, 1995 MAY U 6 1995 ' ENVIRONMENTAL HEALTH PERMITISERVICES 1 EXECUTIVE SUMMARY At the request of the Federal Deposit Insurance Corporation (FDIC), Geocon Environmental ' Consultants is submitting the enclosed Problem Assessment Report (PAR) for the former Texaco service station site formerly located on the southwest corner of the intersection of South Hutchins Street and West Lodi Avenue, Lodi, California The site is now referred to as 305 South Hutchins ' Street This PAR presents the methods and results of subsurface environmental investigation work performed at the subject site Work presented in this report was performed to delineate the vertical and lateral extent of petroleum hydrocarbons detected in vadose zone soil and evaluate the possible ' sources of petroleum hydrocarbons and other organic chemicals detected in groundwater beneath the site Historical research performed by Geocon appears to indicate that the site may have been used as a retail service station since as early as 1926 1926 and 1950 Sanborn Maps depict a "Gas and Oil" structure within the northeast portion of the site and a permit was issued by the City of Lodi to the ' Douglas Oil Company in 1957 for the construction of a new service station and the installation of new underground storage tanks (UST's) This information suggests that two generations of USTs were used at the site to store and dispense motor vehicle fuels Initial environmental investigations were performed at the site between March 1991 and January 1993 by Uriah Environmental Services, Inc (Uriah) and EPM Technologies (EPM) and included the drilling of 11 soil borings, the installation of three groundwater monitoring wells and the ' chemical analysis of soil and groundwater samples Data from these investigations revealed the existence of gasoline and diesel range petroleum hydrocarbons in soil and groundwater beneath the subject site In addition, volatile organic compounds (VOCs) and methyl tert-butyl ether (MTBE, ' a component of gasoline) were detected in groundwater beneath the site in July 1992 and January 1993, respectively Additional subsurface investigation was necessary to further evaluate the lateral extent of residual petroleum hydrocarbons in soil and the possible sources of dissolved petroleum ' hydrocarbons, VOCs, and MTBE in groundwater beneath the site Between approximately January and June of 1993, a soil vapor extraction system (VES) was installed in the southwest portion of the site The VES consisted of one vapor extraction well (VW- 1) installed by Uriah and a catalytic oxidizer installed by EPM for the treatment of extracted petroleum hydrocarbon vapors The VES, which was operated by EPM between June 1993 and ' March 1994, was reported to remove approximately 3,333 pounds of hydrocarbons from beneath the southwest portion of the site Geocon estimates that approximately 500 cubic yards of soil beneath the southwest portion of the site were remediated by the VES Between July and November of 1994, Geocon advanced 13 soil borings, constructed two additional offsite groundwater monitoring wells and constructed five onsite vapor extraction wells The additional data acquired from the chemical analysis of soil and groundwater samples during this phase of study allow for an estimation of the remaining lateral limits of gasoline and diesel fuel -1- I