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v � . A S S 0 C I A T E S f N C was sampled and transferred to appropriate sample containers, using a clean, disposable bailer with a bottom-emptying device to reduce volatilization Sample containers were then labeled with sample identification, placed on ice, and shipped under chain-of-custody to Sequoia Analytical Feld development/purge logs are presented in Attachment 1 Laboratory Analysis The groundwater sample from well MW I was analyzed by Sequoia Analytical for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Methods 801518020,and oxygenate fuel additives by EPA method 8260 Laboratory Results Only methyl tert-butyl ether (MTBE) was detected above the laboratory method detection limits The reported MTBE concentration was 3 98 parts per billion (ppb) No other constituents were detected Analytical results are summarized in Table 2 Laboratory data sheets and chain-of-custody documentation are provided in Attachment 2 • WELL SURVEY ATC reviewed PHS/EHD groundwater well construction logs, Department of Water Resources (DWR) groundwater well construction Iogs, and conducted a site walk in the vicinity of the site to identify any groundwater wells located within 2,000-foot radius of the site The search revealed thirteen potential wells located within approximately 2,000 feet of the site None of these wells are located within 800 feet of the site The approximate well locations are shown on Figure 3 - The wells were located on the map according to "well location" description information provided on the well construction logs Available well construction details are included in Table 3 In order to assess hydraulic characteristics beneath the site ATC reviewed data collected from a nearby subsurface investigation Marley Cooling Tower Company (MCTC), located east and adjacent to Franklin High School, is currently conducting corrective action measures to address soil and groundwater impacted with chromium In brief, MCTC has installed numerous monitoring and extraction wells to investigate subsurface conditions beneath the site and determine the appropriate method for dissolved chromium remediation Their extensive chromium subsurface investigations performed to date have determined that there are four hydrostatigraghic units underlying the site These four hydrostati graphic subunits are 1) the . shallow zone, 2) the 100 foot sand zone, 3) the intermediate zone, and 4) the deep zone The shallow zone extends from the water table to approximately 80 feet bgs The 100-foot sand occurs between approximately 80 and 120 feet bgs The intermediate zone occurs between w 117292 00011reportsl3 qmr 2000 doc 2