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Ms Lori Duncan Project No 120221 03000000 September 27, 2006 Page 2 BACKGROUND The Transmission Shop (site) is located at the northwest corner of the intersection of Charter ' Way and Lincoln Street in Stockton, San Joaquin County, California (Figure 1) The site is a multi-business property located in a commercial and residential neighborhood The-site contains The Transmission Shop (a transmission repair shop) and the former Rodger's Harbor Sea Food Market According to the San Joaqwn County Public Health Services (SJCPHS), two underground storage tanks (USTs) were previously at the site, which formerly housed a retail service station that dispensed gasoline until sometime in the 1950s it is unknown when the first UST and dispenser island were removed Thorpe Oil of Lodi, California, removed the second UST in February 1996 Residual hydrocarbons were reported in soil samples collected from beneath the UST, however, Total Petroleum Hydrocarbons as gasoline (TPHg), Total Petroleum Hydrocarbons as diesel (TPHd), and benzene concentrations were below laboratory detection limits Three other known former or current automobile service stations with UST facilities exist near the site, on the other three corners of the intersection of Lincoln Street and Charter Way (inset, Figure 2) UST-related petroleum hydrocarbons have been detected in groundwater beneath each of those facilities, according to reports held by the SJCPHS The general direction of 1 groundwater in the site vicinity is eastward (away from the Port of Stockton), according to SJCPHS GROUNDWATER MONITORING On August 21, 2006, a Shaw technician measured depth to groundwater from seven of the nine site wells, MW-1R, MW-3R, MW-4RS, MW4RD, VW-1D, VW-2D, and VW-4 Wells MW-2R and VW-313 were blocked and therefore not measured or sampled Samples were ' collected from the seven wells on August 21, 2006 Free product was not observed in the groundwater monitoring wells (Table 1 and Appendix A) Sampling and analysis procedures are presented in Appendix B ' The groundwater samples were shipped to California Laboratory Services (CA DOHS ELAP #1233) in Rancho Cordova, California, and analyzed for TPHg, benzene, toluene, ethylbenzene, and xylenes (BTEX) and methyl tert-butyl ether (MTBE) using U S Environmental Protection Agency (USEPA) Methods 8015M (TPHg) and 8260B (BTEX and MTBE) The laboratory analyses indicate that TPHg was present in the groundwater samples from wells MW-4RS, MW-4R), VW-11), and VW-21) at concentrations ranging from 360 micrograms per liter (pg/L) to 39,000 µg/L BTEX concentrations were reported in samples from the same wells, benzene ranged from 99 µg/L to 7,200 Ag/L, toluene ranged from 14 [tg/L to 1,300 pg/L, ' N tiTechP&120221 Don RodgerslRpts106-QMQ06DRAFT doc SHAW ENVIRONMENTAL,INC