Laserfiche WebLink
6633 Pacific Ave <br /> Page 3 <br /> The residual soil contamination associated with the former underground storage tank <br /> piping system has not been characterized, since no samples were collected or <br /> analyzed. <br /> The first groundwater sample from MW2 that evidenced contamination was collected <br /> on December 6, 1991. The contamination was likely associated with an upgradient <br /> release. Since its source is not documented with soil sample results, it is impossible <br /> to estimate the contribution which this contamination may pose as a secondary <br /> source of contamination. <br /> With regards to the dissolved hydrocarbon contamination, PHS/EHD suggests that if <br /> it is believed that the contamination detected during the standard EPA Method 602 <br /> for BTEX is associated with an offsite chlorinated solvent problem, that EPA Method <br /> 624 be used instead. The chlorinated solvent contamination which has been <br /> evidenced is not an artifact but has been documented associated with a plume <br /> originating from other businesses in Lincoln Center. <br /> Remediation <br /> Please be aware that corrective action by statute does not include activities associated <br /> with the detection, confirmation or reporting of the unauthorized release or the <br /> repair, upgrade, replacement or removal of the underground storage tank. Therefore, <br /> the inference that the tank removal and replacement constituted remedial action <br /> sufficient to evaluate the site for post-remedial monitoring (natural attenuation) is <br /> unfounded and incorrect. Residual soil contamination continues to threaten and/or <br /> impact groundwater quality and requires remediation via implementation of an <br /> approved corrective action plan. <br /> 3.0 Environmental, Public Health, and Safety Goals <br /> The list of existing and potential beneficial uses of groundwater included was <br /> incomplete, please refer to the CVRWQCB staff report A Compilation of Water <br /> Quality Goals or the CVRWQCB's Basin Plan for a complete listing of beneficial uses <br /> of groundwater located in Region 5. <br /> The Leaking Underground Storage Tank Fuel Tank Manual prepared by the State <br /> Water Resources Control Board in 1986 includes minimum detection limits that are <br /> less than those listed for benzene and toluene. <br /> The secondary water quality goal's numeric value for gasoline was too high. The <br /> taste and order threshold for TPH-gas is 5 ppb. Also, a typical detection limit for <br /> gasoline in water is 50 ppb. <br />