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No Further Action Request Section 2 0 Former American Forest Products Facility 2/16/2006 URS Project No 17322736 Page 2-1 2.0 IN SITU GROUNDWATER SAMPLING AND RESULTS Two rounds of in situ groundwater sampling were conducted These rounds included collecting two groundwater samples in July 2005 and an additional two samples in September 2005 The sampling locations are shown on Figure 2 21 JULY 2005 FIELD ACTIVITIES The first round of the downgradient groundwater assessment was completed in July 2005 Following assurance from the drilling subcontractor that the desired penetration depth of 65 feet could be reached, up to six direct-push borings were planned and a mobile analytical laboratory was engaged in order to obtain immediate results to track the plume to its ultimate downgradient extent The direct-push borings were attempted by Woodward Dnlling of Rio Vista, California, and the mobile analytical laboratory services were provided by TEG of Rancho Cordova, California Drilling and sampling activities were directed by URS geologist, Tony Mindling Boring HP-9 was attempted on July 7, 2005, with a Power Probe equipped with 4-inch-diameter augers The Power Probe met refusal at 24 feet bgs Due to drilling equipment failures and parts replacement, the mobile lab was released The boring, HP-9, was completed on July 8, 2005, and an in situ groundwater sample was collected from a depth of 65 feet bgs Because field conditions had limited the Power Probe's depth of, HP-10 was completed on July 8, 2005, using an auger ng The depth of the boring was limited to 52 feet bgs because the driller had an insufficient number of auger flights to go deeper Approximately seven hours after completion, the depth to water in boring HP-10 was approximately 49 feet bgs At that time a water sample was collected from the open boring using a disposable bailer A third boring was attempted which only reached a depth of 52 feet due to equipment limitations No water sample was collected due to failure of the Power Probe rig when the in situ drive sample was attempted All borings were grouted under the oversight of Mr Jeffrey Wong of the SJPHS-EHD Soil cuttings derived during the investigation were placed in labeled 55-gallon drums pending laboratory analysis and appropriate disposal Purge and rinsate water were placed in a Baker tank located at the site The two groundwater samples were stored on ice and hand-delivered under chain-of-custody protocol to TEG of Rancho Cordova for analysis of volatile organic compounds (VOCs) by U S Environmental Protection Agency (EPA)Method 8260B 1 22 SEPTEMBER 2005 FIELD ACTIVITIES Following a telephone discussion with the SJPHS-EHD regarding the July field activities and results, an additional two in situ sampling locations, HP-11 and HP-12, were planned to address a wider downgradient arc extended to the east and west of borings HP-9 and 14P-10 Since direct-push sampling had been unsuccessful in reaching the desired sampling depth of 65 feet bgs, the September samples were collected from temporary wells Both borings were completed on September 1, 2005, using 8-mch- diameter augers to a depth of 65 feet bgs The augers were partially withdrawn, leaving approximately 50 E 1'ProlectslURs1AFP12005 IBCA Investigation\HP Investigation Report\AFP 2005 Report WP-TE-Rev02 doc