Laserfiche WebLink
i <br /> 1444 MARIPOSA ROAD <br /> WKA No 2938.07 <br /> • January 18,2001 <br /> Page 6 <br /> i <br /> Based on results of quarterly groundwater samples obtained since 1993, the contaminated plume <br /> appears relatively small and largely limited to the boundaries of the property. Additionally, <br /> because the plume does not appear to be expanding or undergoing any obvious migration, some <br /> degree of natural attenuation and or bioremediation is most likely occurring beneath the site. <br /> These natural processes along with the relatively flat calculated groundwater gradients provides a <br /> high level of assurance that possible sensitive receptors in the form of offsite wells will likely not <br /> be impacted by contaminated groundwater beneath the site. Finally,the fact that the former <br /> leaky underground fuel storage tanks have been removed and a vast majority of the contaminated <br /> soil has been excavated and aerated on site provides further protection for any nearby potential <br /> sensitive receptors <br /> A summary of the groundwater elevations is provided in Table 1. Results of laboratory analysis <br /> for water samples are included in Tables 2 and 3 Copies of the analytical reports and chain-of- <br /> custody <br /> hain-ofcustody documentation are appended. <br /> Based on past site investigative activities and results of laboratory analysis, it is our opinion that <br /> the site has met the criteria for classification as a"low risk groundwater case" as defined by the <br /> CVRWQCB As a result, we recommend that SJCPHD require no further action as related to the <br /> underground storage tanks at this site and that the CVRWQCB be notified of our findings Upon <br /> concurrence for site closure by the SJCPHS and the CVRWQCB,we recommend that the <br /> monitoring wells be abandoned in accordance with County and State regulations and purged <br /> groundwater currently stored be removed from the site. <br /> Wallace-Kuhl&Associates, Inc. <br /> ��;� PURI ''•��.+ <br /> OL <br /> BxUI <br /> r � • <br /> •r•srrwNa`*�•r <br /> atthew Taylor urt Balasek <br /> Senior Environmental Technician Senior Hydrogeologist R.G., CH <br /> Copy to- Mr.Dan Sweeney;United Rentals, Inc. <br /> MT:KB:sdm <br /> MOW ROF <br /> �t XI <br /> w T` / <br />