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EarthTech Ms. Violeta Mislang A iym International Ltd,Company September 30, 2005 Page 3 of 4 All soil gas samples will be delivered to a certified laboratory for analysis by EPA Method TO-15 (open scan) for VOCs plus naphthalene. A duplicate sample will also be collected for quality assurance and quality control (QA/QC). Soil gas sampling and analyses are summarized in Table 1. Earth Tech proposes to use the following state-certified laboratory to conduct the proposed soil gas analyses by EPA Method TO-15: • Air Toxics Ltd. located at 180 Blue Ravine Road, Ste. B in Folsom, California (Telephone number: 916-985-1000). The reporting limits (RL) for VOCs and naphthalene by EPA Method TO-15 were provided by Air Toxics Ltd and are presented in Attachment 2. Upon completion of the soil gas sampling, the boring will be further advanced in order to collect groundwater samples as described below. Grab Groundwater Sampling for Naphthalene and Bis(2-ethylhexyl)phthalate Upon the completion of soil vapor sampling, each boring will be further advanced by the DPT drill rig to a depth of approximately 3 feet below groundwater (approximately 20 feet bgs). A slotted PVC casing with filter socks will be inserted into the boring, and grab groundwater samples will be collected from all the four borings using a peristaltic sampling pump. Because the borings will be advanced for the purpose of collecting groundwater samples and the soil lithology is already well known from the January 2005 investigation activities, soil screening with a photoionization detector and lithological logging will not be conducted during the advancement of the borings to the groundwater. For QA/QC purposes, a duplicate groundwater sample will be collected, and triple volumes of one sample will be collected and supplied to the laboratory for matrix spike/matrix spike duplicate (MS/MSD) analysis. Additionally, an equipment blank will be collected from the new tubing used for the peristaltic pump. The equipment blank will be collected using Type II Reagent-Grade water. All the groundwater samples will be delivered to a certified laboratory in an iced cooler for naphthalene and bis(2-ethylhexyl)phthalate analyses using EPA Method 8270C. Groundwater sampling and analyses are summarized in Table 1. Earth Tech proposes to use the following state-certified laboratory to conduct the proposed groundwater analyses: • Entech Analytical Labs, Inc. located at 3334 Victor Court in Santa Clara, California (Telephone number: 408-588-0200). The method detection limits (MDLs) and RLs for the planned groundwater analyses by 8270C were provided by Entech as follows: • Naphthalene: MDL = 3 pg/L, RL = 10 pg/L, and • Bis(2-ethylhexyl)phthalate: MDL = 2 pg/L, RL = 10 pg/L.