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BEM • • BEMSystem,Ina SYSTEMS INC, BE 1359 Holz Rubber Co.,Inc. Pro/ectAsh,Lodi,CA Groundwater Samoline and Analysis Plan Addendum to Soil Samolin2 Work Plan R.M. Holz Rubber Co.,Inc. 1129 South Sacramento Street Lodi, California 95240 INTRODUCTION BEM Systems, Inc., (BEM) in association with Malcolm-Pirnie, Inc., both full-service environmental and engineering consulting firms, plan to perform a groundwater sampling program at the site of R.M. Holz Rubber Co., Inc., 1129 South Sacramento Street, Lodi, California (see Figure 1, Site Location Map). The purpose of this study is to evaluate whether groundwater quality has been impacted from the historical industrial operations at the subject property. This work is being performed for a confidential client as part of property acquisition environmental due diligence. GROUNDWATER SAMPLING Six (6) groundwater samples will be collected from the perimeter of the site as depicted in Figure 2, Proposed Sampling Locations. The number and locations of the proposed sampling points are based upon current and past activities and known site conditions. The actual locations of the sample points may vary slightly based on field conditions encountered during the implementation of the sampling program. Groundwater sampling will be performed under the direction of a California Registered Professional Engineer or Geologist. SAMPLING PROCEDURE Groundwater samples will be collected using a HydroPunch sampling system. The procedure uses a truck- mounted drilling rig to advance a borehole approximately 2 feet above the groundwater table (expected at 45 to 50 feet bgs). The HydroPunch tool consists of a sacrificial drive point attached to a small diameter polyvinyl chloride (PVC) well screen with 0.010-inch slots. The metal body of the tool fits over the screen. The tool is driven 5 additional feet from the bottom of the drilled borehole (similar to a split-spoon sampler) and the HydroPunch is opened by pulling back on the body of the tool 2 feet to expose the screen. The tool is connected to the surface using a hollow drive pipe of large enough inside diameter to permit the passage of a thin bailer. The groundwater sample is collected by lowering the bailer from the surface through the drive pipe and retrieving the groundwater sample. The sample is transferred directly into laboratory glassware. The drive point and screen remain in the borehole. During the advancement of the auger and the collection of the groundwater samples, a photoionization detector(PID)will be used to screen the soil and water for the presence of volatile compounds. SAMPLE HANDLING The samples will be labeled with unique identification numbers, time and date of sample collection, and the name of the sample collector. Labeled samples will be placed in sealable plastic bags on ice in coolers, cooled to a temperature of approximately 4°C and preserved as appropriate. Samples will be transported in sealed coolers under strict chain-of-custody via overnight air freight for subsequent laboratory analysis. September 1996 1 g:I ac&c-h&c113591 corresp110125cd,doc