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cirvrsion of ENVIRONMENTAL SOLUTIONS UnC0R August 18, 1998 Project 2613-100 003 Mr Don Rodgers POD 11900 South Union Road Manteca, California 95336 Re Second Quarter 1998 Status Report for The Transmission Shop, Located at 515 West Charter Way, Stockton, California Dear Mr Rodgers At your request, Pinnacle Environmental Solutions (Pinnacle), a division of EMCON, previously conducted an environmental investigation and currently performs quarterly groundwater monitoring at the subject site (see Figure 1) Pinnacle has prepared this status report on the work conducted during the second quarter 1998 Work included groundwater monitoring, which consisted of measuring depth to groundwater and collecting a groundwater sample from the well for subjective and laboratory analyses BACKGROUND The site is Iocated at the southeast corner of the intersection of Charter Way and Lincoln Street in Stockton, California (see Figure 1) The property is located in a commercial area and is currently being used as a transmission repair shop Based on information provided by the San Joaquin County Public Health Services (SJCPHS), two underground storage tanks (USTs) were present, and the site was historically used as a retail service station, with gasoline dispensing activities ceasing sometime in the 1950s It is unknown when one of the USTs and dispenser islands were removed However, based on information provided by SJCPHS, Thorpe Oil of Lodi, California, removed the remaining UST in February 1996 Residual hydrocarbons were detected in soil samples collected from beneath the UST However, total petroleum hydrocarbons as gasoline (TPHG), as diesel (TPHD), and benzene were below laboratory detection limits The approximate UST locations relative to site structures are shown on Figure 2 In the vicinity of the subject property are several former or current UST facilities a former ARCO Service Station, a Chevron Service Station, a Texaco Service Station, a former Colombo bakery, and a former Dolly Madison Based on data collected from subsurface investigations performed at the former ARCO Service Station, Chevron Station, and Texaco Station (Iocated at the corners of Charter Way and Lincoln Street), residual and dissolved hydrocarbons have been detected beneath these facilities, and a commingled petroleum hydrocarbon plume exists beneath Charter Way and Lincoln Street SAC1A\RODGERS QW-981mtt 1 e 3939 Cambridge Road Suite 220 Cameron Park California 95682 (530)676 68 4V [ ax