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E11C�ytg Mr James L Barton October 29, 2004 Page 5 Soil Boring and Sam hn On August 16, 2004, a geologist from ENSR observed Cascade Drilling, Incorporated (Cascade) Of Rancho Cordova, California advance soil boring MW-9R to an approximate depth of ' 70 feet bgs The boring was advanced using a truck mounted drill rig using 81/ -inch diameter hollow stem augers The soil boring was completed as groundwater monitoring well MW-9R The location of the monitoring well is shown on Figure 2 Soil samples were collected from MW-9R at a minimum of 5-foot intervals and at changes in lithology to the total depth of the boring The sod samples from the boring were logged using Unified Soil Classification System (USCS) visual and manual methods Soil samples collected ' were field screened for the presence of volatile organic compounds using a photoionization detector (PID) A soil boring log containing PID readings, USCS descriptions, and other pertinent drilling information is included in Attachment I ' Soil Sample Anal ical Results ' A soil sample collected from an approximate depth of 40 feet bgs was submitted to CLS in Rancho Cordova, California under chain-of-custody protocol The soil sample was analyzed for benzene, toluene, ethyl benzene and xylenes (BTEX), 1,2-dichloroethane (1,2-DCA), 1,2-dibromoethane (EDB), and MtBE using EPA Method 82606, and TPHg by EPA Method 8015 Modified Soil samples were collected using procedures described in Attachment A Soil sample analytical results are summarized in Table 12 and copies of the ' laboratory analytical reports are included in Attachment D Monitoring Welllnstallation ' Groundwater monitoring well MW-9R was constructed using 2-inch diameter, flush threaded, Schedule 40 PVC casing installed to a total depth of approximately 70 feet bgs The well was screened from approximately 50 to 70 feet bgs with a 0 02-inch machine slotted casing No 3 ' Monterey sand filter pack was placed from the base of the boring to approximately 5 to 8 feet above the top of the well screen A 2-feet thick bentonite seal was emplaced above each filter pack, and the remaining annular space was filled with cement grout containing approximately ' five percent bentonite to approximately 1-foot bgs The top of the well was completed with a flush grade traffic rated vault box set in concrete A well completion diagram for well MW-9R is presented in Attachment I Well Develo mens and warn lin Groundwater monitoring well MW-9R was developed and sampled on August 31, 2004, Iaccording to field methods and procedures outlined in Attachment A RQcsacramentoVroiects\Proiects1069401509$-293TinaRRepoftlQuartedy Monrtonng ReportO098 3rd Qtr 04 QMR doc i 6eieorar,no 35 Yepr,, o'Excohenre Envrronrnenra'SQrti icef t