ARCHIVED REPORTS_REPORT SUMMARIZING INSTALL OF MONITORING WELLS MW4,MW5,MW7,MW8 & SOIL BORING RDM1 & 4TH QTR 2013 GROUNDWATER SAMPLING

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• Field Methods and Procedures Enclosure Page 2 2 Soil in one of the brass or stainless steel tubes from the split-barrel sampler will be extracted upon recovery, placed in a plastic bag, and sealed for later screening for organic vapors using a photo ionization detector(PID)or a flame ionization detector(FID). The remaining portion of the soil sample will be examined and a complete log of soil conditions will be recorded on a soil boring log using the Unified Soil Classification System (USCS)visual and manual method (ASTM D2488). The split-barrel sampler or slide hammer sampler will be cleaned to prevent contamination across sampling intervals using procedures described in Section E. Soil generated from the soil borings will be stored in 55-gallon drums or in a plastic-lined roll-off bin(unless otherwise directed by agencies or the client)labeled with the corresponding boring number, date, and address of the facility. B.3 Hydraulic Direct Push (Geoprobe) A Geoprobe is a drill rig that uses static force and roto-percussion to advance a dual tube sampling • system. The dual tube sampling system consists of a 3.5-inch diameter,steel drive casing and a 2.8- inch diameter inner sample barrel that are simultaneously pushed,driven,or vibrated into the ground. The sampler is lined with brass sleeves or butyrate liners equal to the inside diameter of the sampler. The closed piston sampler is driven to just above the desired depth and piston sampler is opened the sampler is then driven 24 to 60 inches. After being advanced, the inner sample barrel is retrieved while the outer drive casing is left in place to prevent the borehole from collapsing.This is process is repeated continuously, or at 5-foot intervals (maximum), or as directed by the geologist. After • retrieving the inner core barrel,samples are retrieved for lithologic identification and screening with a PID or FID. The soil sample is collected at the desired depth by cutting the butyrate liner with a hand saw.The soil sample is then labeled, sealed at each end with plastic end caps and stored on ice pending sample selection and transport to the laboratory for analysis. The end caps will be secured to the ends of the All tube to prevent loss of volatile constituents. The sample will be labeled with an identification number, time, date, location, and requested laboratory analysis. The sample will then be placed in a plastic bag and stored at approximately 4 degrees Celsius in an ice chest for transport to the laboratory. Sample custody procedures outlined in Section F of this attachment will be followed. This process is performed for each sample collected. The dual-walled sampler will be cleaned to prevent contamination across sampling intervals using procedures described in Section E. Soil generated from the soil borings will be stored in 55-gallon drums or in a plastic-lined roll-off bin(unless otherwise directed by agencies or the client)labeled with the corresponding boring number, date, and address of the facility. • B.4 Lithologic Logging A log of soil conditions encountered during the drilling and sample collection will be maintained using the USCS by a RDM engineer/geologist. All boring logs will be reviewed by a California registered engineer/geologist. The collected soil samples will be examined and the following information recorded: boring location, sample interval and depth, blow counts, color, soil type, moisture content (qualitative), and depth at which ground water(if present) is first encountered. A portion of the soil • sample is placed into a plastic bag and sealed for headspace screening of the organic vapors using a PID or FID. • •