ARCHIVED REPORTS XR0001159 - Laserfiche WebLink

Home Browse Search

Ms Lori Duncan Project No 120221 03000000 July 20, 2006 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 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 (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 The field components of a reinvestigation of the site and evaluation of groundwater remediation approaches have been performed A report of this investigation and evaluation is being prepared and will be submitted when all treatability tests are completed GROUNDWATER MONITORING On February 6, 2006, a Shaw technician measured depth to groundwater from eight of the nine site wells, MW-IR through MW-3R, MW-4RS, MW-4RD, VW-11), VW-3D, and VW-4 Well VW-21) was blocked by a larger vehicle that was unable to be moved Samples were collected from the eight wells on February 6, 2006 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 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) Methods 8015 (TPHg) and 8260B (BTEX and MTBE) The laboratory analyses indicate that TPHg was present in the groundwater samples from wells MW-1R, MW-4RS, MW-4RD, VW-11), and VW-3D at concentrations ranging from 210 11setsactpsookcommon\TechPuh1120221 Don Rodgers ftts106 0111006 doc SHAW ENVIRONMENTAL,INC