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3212 North California Street <br /> Page 2 of 2 <br /> submit a technical argument demonstrating that the original proposal should be <br /> implemented over the EHD-recommended change. <br /> In Quarterly Groundwater Monitoring and Remediation Progress Report Second Quarter <br /> 2007 dated August 13, 2007, SECOR requests a reduction for sampling and monitoring <br /> MW-2, MW-3, MW-4, MW-6, and MW-7 from quarterly to semi-annually beginning <br /> third quarter 2007. SECOR also requests MW-1, MW-5 and MW-8 be removed from the <br /> quarterly monitoring schedule altogether. However, in another paragraph SECOR states <br /> that a petroleum hydrocarbon plume exists near MW-1 and recommends continued <br /> groundwater monitoring. Upon review of historical and current analytical groundwater <br /> results EHD believes DIPE, ETBE, TAME, ethanol, and EDB may be removed from the <br /> analytical list of compounds since these compounds have not been detected recently in <br /> groundwater samples collected from any monitoring well. EHD also approves annual <br /> sampling for MW-2, MW-3, MW-5, MW-6, MW-7, MW-8, and VW-4. Continue <br /> collecting groundwater samples quarterly from MW-1, VW-IB, VW-2B, and VW-3B, <br /> and collect groundwater samples semi-annually from MW-4. Continue to collect depth <br /> to water measurements for every vapor and monitoring well during each quarterly <br /> groundwater monitoring event for the purpose of determining the groundwater gradient; <br /> and please remove casing caps from all monitoring wells and allow adequate time for the <br /> groundwater level to stabilize before taking depth to water measurements. Recent <br /> groundwater elevation contour maps do not exhibit a definitive groundwater flow <br /> direction and EHD is concerned the groundwater has not been given enough time to <br /> equilibrate after removing the casing caps. <br /> Submit a well permit application and permit fee of$89 to EHD by October 25, 2007, and <br /> notify EHD at least a week prior to the scheduled fieldwork. Please contact Vicki <br /> McCartney at (209) 468-9852 or by email at vmccartnc s'cehd.com if you have any <br /> questions regarding this letter. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Victoria L. McCartney, Senior REHS Nuel C. Henderson, Jr., PG <br /> Unit IV-Site Mitigation Engineering Geologist <br /> Unit IV- Site Mitigation <br /> c: Rusty Benkosky, PE - SECOR <br /> James L.L. Barton, PG - CVRWQCB <br />