ARCHIVED REPORTS XR0009011 - Laserfiche WebLink

Home Browse Search

CAMBRIA Existing Underground Storage Tanks (USTs) SJCPHS/EHD previously recommended collecting soil samples beneath the existing USTs and states in the March 30, 2000 letter that this recommendation has not been addressed Soil sample collection beneath USTs typically is performed when the USTs are removed As mentioned in our September 1, 1999 Site Investigation Work Plan, Equilon Enterprises LLC (the UST owner) does not plan to remove the existing UST, therefore it is not feasible at this time to collect soil samples from beneath the UST complex Further, this type of soil sampling is typically performed to determine the source of the release Cambria's previous investigations have produced sufficient data to indicate the UST area is the likely source area for petroleum hydrocarbons and MTBE detected in groundwater at this site SJCPHS/EHD states in the March 30, 2000 letter that "It is unknown if an active source of release still exists " The existing USTs at this site could not be acting as an active source as they have been out of service since late 1998 When they were taken out of service the fuel was removed from the tanks and the piping system Report Tables- Apparently there was some confusion about the tables submitted with Cambria's February 10, 2000 site investigation report SJCPHS/EHD requests in their March 30, 2000 letter that we submit the missing parts of Table 3 There is nothing missing from Table 3 This table reports additional groundwater chemical analytical data that Blaine Tech Services, Inc (Blaine) did not include on their Well Concentrations table (in Appendix C of the report) This reporting format is consistent with the way we have been reporting groundwater analytical data for the past several years Blaine enters the analytical data in their Well Concentrations table for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX) and methyl tertiary butyl ether (MTBE) by EPA Methods 8020 and 8260 In addition to the chemical analytical data, Blaine also reports the sampling date, the top of casing elevation, the depth to water measurement, and the groundwater elevation Any additional chemical analytical data generated for the site is then put on a supplemental table, which is prepared by Cambria Site Conceptual Model- Cambria will prepare a site conceptual model for this site as requested by SJCPHS/EHD This model will be included in the site investigation report generated after completion of the work proposed below Well Survey. Cambria conducted a well survey prior to June 1, 2000 as requested by SJCPHS/EHD in their March 30, 2000 letter The results of this survey will be reported either in the site investigation report for the work proposed below, or in a quarterly monitoring report 0955 2