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t� f � � Ms Lori Duncan Project No 880-039 1A 01010000 December 16, 2005 Page 2 BACKGROUND The Transmission Shop (the "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 Joaquin 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 Ilimits 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 (see 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 groundwater in the site vicinity is eastward (away from the Port of Stockton), according to SJCPHS GROUNDWATER MONITORING On November 7, 2005, a Shaw technician measured depth to groundwater from the nine site wells, MWAR through MW-3R, MW-4RS, MW-4RD, VW-1D through VW-31), and VW-4 Samples were collected from the nine wells on November 7, 2005 Free product was not observed in the groundwater monitoring wells (see Table 1 and Attachment 1) Sampling and ' analysis procedures are presented in Attachment 2 The groundwater samples were shipped to Severn Trent Laboratory (NELAP #01119CA) in West Sacramento, California, and analyzed in their San Francisco laboratory for TPHg, benzene, toluene, ethylbenzene, and xylenes (BTEX) and methyl tert-butyl ether (MTBE) using U S Environmental Protection Agency (EPA) Method 8260B The laboratory analyses indicate that TPHg was present in the groundwater samples from wells MW-1R, MW-4RS, MW-4RD, and VW-1D through VW-31) at concentrations ranging from 54 micrograms per liter (pg/L) to 40,000 lig/L BTEX concentrations were reported in samples from the same wells (toluene and xylenes were not detected in well MW-4RD), benzene ranged from 7 1 gg/L to 7,900 pg/L Benzene was also detected in the groundwater sample from well ' C880038 Don Rodgersftnitonng Rpts105 Q414Q05 doc SHAW ENVIRONMENTAL,INC