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e z S E C 0 R te and and 10, 2001, GR installed four groundwater offsitewellswere inshree talled ed tfo+depths n August 8, 9 -fhe three sh depth of 79 one deep onsite (MW-8 through M�elldeep well, MW-11, was installed to a total dip for ranging from 28 to 29 feet bgs s MW-8' MW-9 and MW-10 were 7reportedrrtper NO bgs Soil samples collecteedMfr 1 w14' collected at 14 feet bgs, cantoined 1 7 p were all analytes Soil same MW-9 and MW-14, (ppm) of MtBE groundwater from well MW-11 was Groundwater samples collected from wells M reported as ND for 611 analytes Of110ppb(EPA Method g260)ted ++� MtBE at a concentra (SECOR) orated ( h December 7, 2001, SECOR lntenational incorporated on wells On December 3 throng (DPE) event at the site The DPE was the test varied from performed a dual-phase extraction MW-3 and MW-7, and operated for a total of 110 hours Flow rates during feet per mnuke (cfm) and vacuum rates varied from 10 a+tat leaf Q 10 90 to 33 41 cub+c p event, SEGOR reportedly unt of hydrocarbons mercury (+n H9) Over the course of the five day TPH , 0 01 lbs of benzene, and 6 64 rIn oth MtBE est SECOR determined that the of pounds (lbs) of g les collected durl g raximate4y 20,830 gallon removed is based on laboratory same vacuum radius of Influence was between 36 and 60 feet Appeal alternative for this site groundwater were extracted during the DPE event Based emcee low mass removal achieved with this test, SECOR concluded that DPE Is not aneffective and sparge points SP-A GR Installed monitoring wells MW-12 and probes (CPT-2 and CPT-3) to a In December 2002, was equipped with an onboard through SP-H, SP-J, and SP-K, and installation The Cp P rig ons The CPT maximum depth of approximately 144 feet bgs at provided a real time analysis of h CPT ur resistance ito sleeve friction far computer system th p comparing t device creates a Vithologic log of the boring by on the CPT cone groundwater sampling probe was advanced n a separate After coHectivn of Vithologic data, a 9 robe) to obtain depth discrete groundwater location (approximately 3 feet from the original probe) were determined utilizingaundwater samples The target depths of the discrete camp tracts to expose disposable PVC scream eeleaned information obtained from the advancement of the CPT At the target depth'for g Info lin device le was collected using p sample collection, the sampling roundwater camp les were handled as groundwater to enter the device Each groundwater containers Samp teflon bailer and then decanted intolaboratorySupp et bgs TPHg and BTEX A CPT 2 groundwater samples and 125 fes d gths of 75, 101, and described in Appendix at depths of 74, 100, groundwater samples 120 feet bgs, and CPT-3 was sampled detection el mates, constituents were not detected above CPT bar ngs CPT 2 and CPT limits3 Of tca centrat ons of 2 0 and analyzed from select MtBE depths in thegroundwater sample CPT-2 75 at b MtBE and methanol were detected in the 9 ntCPT-s of 290 and 88, respectively b respectively MtBE was detected CPT-3 100 at a concentration of 6 pp 2,700 F , and TBA were detected n CPT-3 125 at cont are wells, and In December 2002, an ozone sparge system was installed, connected to sp 9 brought online resent qu� led During the second quarter air has been monitored and samplempnitored oir samperly ans from 1991 to m reported Groundwater ground was not Maximum p During the year of 1997, g gradient of 0 002 ft/ft 5 b MW-11) and 100,000 groundwater flow was toward the north at g and TBA continue to decline in site concentration of MtBE and TBA during orostof third quarter were 28 pP ppb (MW-7), respectively Concentra is discussed below monitoring wells Further discussion of quarterly sampling SENSTIVE RECEPTORS (SRS) in the Also in April of 2001, GR conducted a well search and Sensitive Receptor Survey