SITE INFORMATION AND CORRESPONDENCE_CASE 2

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• Page 1 of 2 Harlin Knoll [EH] From: Tim Cuellar [tcuellar@advgeoenv.com] Sent: Friday, September 14, 2007 1:03 PM To: Harlin Knoll [EH] Cc: rmarty@advgeoenv.com; 'bill' Subject: Sierra Lumber Case No. 2 Attachments: Sierra Lumber#2 3rd QR 2006 + MW Install RPT-FINAL.pdf; Sierra Lumber Case#2 GW 03- 07 Model (1).pdf Harlin, I would like to schedule a QM event at Sierra Lumber#2 for Sept. 20 between 8-1. As you may or may not know, I have been assigned this project; I have reviewed the data and am up to speed. The following is a brief summary or work completed for Case#2: June 2004: Three soil borings (B-3, B-7 and B-8)were installed at the site to depths of 25' bsg in the former Case#2 UST area; TPH-g was detected from B-3 as high as 4,960 mg/kg (20'). March 2005: Three ground water monitoring wells (MW-9, MW-10 & MW-11)installed to 40 feet bsg; TPH-g impact detected in soil from MW-9 at concentrations as high as 2,400 mg/kg and in gw at 62,000 ug/I. Ground water flow direction towards NE at gradient 0.01. Sept. 2005: QM event; TPH-g detected from MW-9 at 70,000 ug/I; ground water flow direction towards SW at gradient 0.02. Nov. 2005: QM event; TPH-g detected from MW-9 at 59,000 ug/l; ground water flow direction towards SW at gradient 0.007. Jan. 2006: Three additional wells(MW12, MW-13 & MW-14) installed; MW-12 was shallow well and MW- 13/14 screened 55-65 feet bsg. No soil impact. Mar. 2006: QM event; TPH-g detected from MW-9 at 86,000 ug/I and MW-14 at 1,900 ug/l; ground water flow direction towards SW at gradient 0.004. April 2006: MWA 1 destroyed due to damaged sewer line. June 2006: QM event; TPH-g detected from MW-9 at 78,000 ug/1 and MW-14 at 2,100 ug/1; ground water flow direction towards SW at gradient 0.005. Sept. 2006: One additional shallow ground water monitoring well (MW-15) installed in or near the former LIST pit area. Soil impacted between 10' and 40'with TPH-g as high as 2,000 mg/kg; vertical extent of soil not defined. Sept. 2006: QM event; TPH-g detected from MW-9 at 84,000 ug/l, MW-14 at 2,200 ug/1 and MW-15 at 93,000 ug/l;ground water flow direction towards W-NW at gradient 0.007. Dec. 2006: QM event; TPH-g detected from MW-9 at 83,000 ug/I, MW-13 at 120 ug/I, MW-14 at 2,800 ug/I and MW-15 at 94,000 ug/l; ground water flow direction towards W-NW at gradient 0.015. Mar. 2007: QM event; TPH-g detected from MW-9 at 96,000 ug/l, MW-10 at 140 ug/l, MW-14 at 3,900 ug/I and MW-15 at 91,000 ug/I; ground water flow direction towards W-SW at gradient 0.007. 9/14/2007