ARCHIVED REPORTS XR0001163 - Laserfiche WebLink

Home Browse Search

Ms Lori Duncan Project No 680-039 1 A 01010000 April 19, 2005 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 Joaquin County Public Health Services (SJCPHS), two underground storage tanks (USTs) were previously at the site, which was a retail service station that dispensed gasoline until sometime in the 1950s It is unknown when the fust 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 ' There are three other known former or current automobile service stations with UST facilities near the site, on the other three corners of the intersection of Lincoln Street and Charter Way (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 February 07, 2005 a Shaw technician measured depth to groundwater and collected samples from the nine Transmission Shop wells, MW-1R through MW-3-R, 1\4W-4-R-S, and MW-4R-D, and VW-1D through VW-4 Shaw's sampling was performed one day before the sampling performed by others at the two nearby gasoline stations Free product was not observed in the groundwater monitoring wells (see Table 1 and Appendix A) Sampling and analysis procedures are presented in Appendix B ' The groundwater samples were analyzed by Severn Trent Laboratory (NELAP #01119CA) in West Sacramento, California, for TPHg using U S Environmental Protection Agency (EPA) Method 8015M, and for benzene, toluene, ethylbenzene, and xylenes (BTEX) and methyl tert- butyl ether (MTBE) using EPA Method 8021 B ' The laboratory analyses indicate that TPHg were present in the groundwater samples from wells . MW-1R, MW-4R-S, MW-4R-D, and VW-1D through VW-4, at concentrations ranging from 58 to 77,000 micrograms per liter (pg/L) BTEX were reported in samples from wells MW-4R-S, 1 N 1sacDP120051Prj188018900191 A Sac doe SHAW ENVIRONMENTAL,INC