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Mike Infurna fEHI From: Marcus Pierce [mpierce@waterboards.ca.gov] Sent: Tuesday, August 21, 2007 12:52 PM To: Mike Infurna [EH] Cc: devra.lewis@us.army.mil Subject: Fwd: Re: Field Sampling Plan Addendum for FMS #24 UST Site Attachments: Stockton FMS Proposed Boring Locations.pdf; Stockton FMS Soil Samples Apr -May 2OO7.xls; Stockton FMS GW Samples Apr -May 2OO7.xls; Stockton FMS Soil Gas Samples Apr -May 2OO7.xls Marcus L. Pierce Engineering Geologist CVRWQCB 11020 Sun Center Drive, #200 Rancho Cordova, CA 95670-6114 916-464-4733 (phone) 916-464-4797 (fax) >>> <Vernon Elarth@URSCorp.com> 8/8/2007 12:14 PM >>> Marcus, We have reviewed and addressed the comments presented in your email dated July 26, 2007. Please see the revised addendum presented below. Field Sampling Plan Addendum for FMS #24 UST Site URS Group, Inc. (URS) has prepared this Field Sampling Plan (FSP) Addendum at the request of the Regional Water Quality Control Board (RWQCB) to further assess the petroleum - impacted soil and groundwater at the California Army National Guard (CA ARNG) Stockton FMS #24 Underground Storage Tank (UST) Site. During our 20 June 2007 telephone conversation you requested an additional investigation to complement the April/May 2007 sampling activities, during which petroleum -impacted soil, soil gas, and groundwater were reported. This FSP Addendum proposes sampling activities intended to satisfy the need for additional data. These additional activities will be completed prior to the submittal of a formal report documenting the site investigation results. URS will follow the same procedures presented in the 25 August 2006 Final FSP, unless otherwise noted. Background From 30 April 2007 through 03 May 2007, URS conducted a subsurface investigation at the Stockton FMS#24 UST Site, which included the drilling of three hand -auger and five hollow - stem auger borings. Soil, soil gas, and groundwater grab samples were collected as part of the investigation. Total petroleum hydrocarbons as diesel (TPHd), TPH as gasoline (TPHg), and volatile organic compounds (VOCs) were reported at the site in all three sample media (see the attached tables for the analytical summaries). The analytical data revealed that the impacts extend beyond the original borings drilled at the site. This proposed investigation will attempt to determine the lateral extent of contamination. Stockton FMS Stockton FMS Soil Stockton FMS GW Stockton FMS Soil Proposed Boring L... Samples Apr-... Samples Apr -Ma... Gas Samples ... Mike, Here is the FMS addendum. Marcus L. Pierce Engineering Geologist CVRWQCB 11020 Sun Center Drive, #200 Rancho Cordova, CA 95670-6114 916-464-4733 (phone) 916-464-4797 (fax) >>> <Vernon Elarth@URSCorp.com> 8/8/2007 12:14 PM >>> Marcus, We have reviewed and addressed the comments presented in your email dated July 26, 2007. Please see the revised addendum presented below. Field Sampling Plan Addendum for FMS #24 UST Site URS Group, Inc. (URS) has prepared this Field Sampling Plan (FSP) Addendum at the request of the Regional Water Quality Control Board (RWQCB) to further assess the petroleum - impacted soil and groundwater at the California Army National Guard (CA ARNG) Stockton FMS #24 Underground Storage Tank (UST) Site. During our 20 June 2007 telephone conversation you requested an additional investigation to complement the April/May 2007 sampling activities, during which petroleum -impacted soil, soil gas, and groundwater were reported. This FSP Addendum proposes sampling activities intended to satisfy the need for additional data. These additional activities will be completed prior to the submittal of a formal report documenting the site investigation results. URS will follow the same procedures presented in the 25 August 2006 Final FSP, unless otherwise noted. Background From 30 April 2007 through 03 May 2007, URS conducted a subsurface investigation at the Stockton FMS#24 UST Site, which included the drilling of three hand -auger and five hollow - stem auger borings. Soil, soil gas, and groundwater grab samples were collected as part of the investigation. Total petroleum hydrocarbons as diesel (TPHd), TPH as gasoline (TPHg), and volatile organic compounds (VOCs) were reported at the site in all three sample media (see the attached tables for the analytical summaries). The analytical data revealed that the impacts extend beyond the original borings drilled at the site. This proposed investigation will attempt to determine the lateral extent of contamination.