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 1 1 RDM ENVIRONMENTAL, INC. 00 Drilling, Well Installation and Groundwater Sampling Proper sampling methods must be followed to assure that samples represent actual Feld conditions and those samples are labeled, preserved, and transported properly to retain sample integrity. This attachment describes procedures to be followed by RDM Environmental, Inc. (RDM), during collection of soil and groundwater samples. Sampling procedures will be based on sampling guidance documents from the American Society of Testing and materials(ASTM), U.S.Environmental protection Agency (EPA), and California Department of Health Services (DHS). Actual sampling procedures to be employed will be based on field conditions and may differ from those described here. A. SITE HEALTH AND SAFETY PLAN 0 Fieldwork performed by RDM and its subcontractors at the site will be conducted according to guidelines established in a Site Health and Safety Plan(SHSP). The SHSP is a document describing the hazards that may be encountered in the field and specifies protective equipment, work procedures and emergency information. A copy of the SHSP will be at the site and available for reference by appropriate parties during work at the site. 0 B. EXPLORATION BORING/SOIL SAMPLING PROCEDURES Soil borings and soil sampling will be performed under the direction of a RDM engineer/geologist. The soil borings will be advanced using drilling techniques appropriate for each project,as specified in the project work plan. B.1 Buried Utility Locations Prior to commencement of work on site, RDM will contact Underground Service Alert (USA) and appropriate utility companies to have underground utility lines located. RDM will also visually survey the site to estimate the locations of potentially unmarked underground utilities. All work associated with the borings will be preceded by hand augering to a minimum depth of 5 feet below grade to avoid 0 damaging underground utilities. A private utility locator may be utilized in cases where there are suspected utilities on private property which are not identified by USA and/or as-built drawings for the facility are not available. B.2 Hollow Stem Auger Soil samples will be collected at maximum intervals of 5 feet. Soil sampling will be done in accordance with ASTM 1586-84. Using this procedure,three 1.06-to 2-inch-diameter,6-inch-length, brass or stainless steel tubes are placed in a California-type-split-barrel sampler. The sampler is driven into the soil by a 140-pound weight falling 30 inches or with a slide hammer on hand auger samples. After an initial set of 6 inches, the number of blows required to drive the sampler an additional 12 inches is known as penetration resistance,or the"N"value. The"N"value is used as an • empirical measure of the relative density of cohesion-less soils and the consistency of cohesive soils. Upon recovery of the split-barrel sampler or slide hammer sampler,the brass or stainless steel tubes containing the soil will be removed. One tube will be sealed at the ends with plastic end caps. The end caps will be secured to the ends of the 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 will be performed for each sample collected.