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s A.Vorster/5 October 1990 4 screened with a photoionization detector (PID) to qualitatively determine the concentration of volatile hydrocarbons that may be present,and aid in selecting the samples to be analyzed. All soil cuttings will be stored on-site in dumpsters pending laboratory analysis for appropriate disposal. MONITOR WELL INSTALLATION AND DEVELOPMENT PROCEDURE The WGR standard operating procedure for installing and developing groundwater monitor wells is included in Attachment A. Borings B-1 through B-5 will be completed as 2-inch diameter monitor wells. Figure 3 presents general well construction details. The well screen will extend 20 ft into the first water-bearing zone or will be terminated before 20 ft if a 4 ft to 5 ft confining layer is encountered. The wells will be developed according to the WGR standard operating procedure included as Attachment A. MONITOR WELL PURGING AND GROUNDWATER SAMPLING PROCEDURE The WGR procedure for purging and sampling groundwater monitor' wells is included in Attachment A. Three well casing volumes will be purged from each well, and previously installed wells and the wells will be sampled with a steam-cleaned PVC bailer. The samples and a travel blank will be sent under chain-of-custody to Coast to Coast Analytical Services (CCAS), San Luis Obispo, California. The purged water will be stored on-site in water-containment tanks pending laboratory analysis for appropriate disposal. ANALYTIC LABORATORY Soil and groundwater samples will be sent to CCAS, a state-certified laboratory. All soil samples selected from the boring and.groundwater samples from the monitor well will be analyzed for TPPH and BTEX by EPA Method 8260 and for oil and grease by Standard Method 503E. SUMMARY The objective of this proposed workplan is to determine the presence and define the possible vertical and horizontal extent of hydrocarbons that may be present in the soils and groundwater beneath the Grant Line Road-Corral Hollow Road project site. In order to obtain this objective, five soil borings are proposed to be drilled and converted to groundwater monitor wells at the site. The locations are based on information obtained from the existing monitor wells, site accessibility, underground utilities, local geology and hydrogeology. The SJLHD will be informed of the proposed monitor well locations as part of the well permitting process. During boring for well 107W1000.va