Laserfiche WebLink
Advanced <br /> GeoEnvironmental, Inc . -o <br /> 05 April 1999 11 12 <br /> AGE-NC Project No. 98-0448 <br /> Mr. Harlin Knoll APR 08 1999 <br /> San Joaquin County Public Health Services - Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Subject: Addendum to Remedial Investigation/Feasibility Study Work Plan <br /> SIERRA LUMBER <br /> 375 West Hazelton Avenue, Stockton, California <br /> Dear Mr. Knoll: <br /> A Remedial Investigation/Feasibility Study Work Plan(WP)was previously submitted to the San Joaquin <br /> County Public Health Services - Environmental Health Division (PHS-EHD) by Advanced <br /> GeoEnvironmental, Inc. (AGE)on 02 March 1999 for the installation of one ground water extraction <br /> well, two soil vapor extraction(SVE) wells,one ground water monitoring well and performance of <br /> a ground water/soil vapor extraction and an in-situ air sparging pilot study. The following additional <br /> information is being submitted to address comments made by the PHS-EHD during a phone conversation <br /> on 02 April 1999: <br /> 1. The first phase of the proposed feasibility study will consist of installation of one ground <br /> water extraction well and performance of an eight-hour drawdown pilot test; the ground <br /> water extraction well will be utilized to extract ground water at various pumping rates while <br /> existing ground water monitoring wells MW-1, MW-2, MW-4A and MW-6 will be utilized <br /> to collect drawdown measurements. <br /> 2. The second phase of the proposed feasibility study will consist of installation of two soil <br /> vapor extraction (SVE) wells and performance of an eight-hour SVE pilot test. During the <br /> second phase, a vacuum will be induced from one of the two newly-installed SVE wells <br /> concurrently with ground water pumping from the ground water extraction well; vacuum <br /> measurements will be collected from MW-4A and the second of two SVE wells. <br /> 3. The third phase of the proposed feasibility study will consist of performance of a 48-hour in- <br /> situ air sparging (IAS) pilot test. The IAS pilot test will introduce a positive air flow into <br /> well MW-413 while IAS field measurements are collected from wells MW-4A and the two <br /> SVE wells. <br /> 4. Following well development activities, at least one ground water sample will be collected <br /> for analysis of iron and manganese. These analysis will be used for consideration of IAS <br /> effictiveness. <br /> 4005 North Wilson Way,Stockton,California 95205 <br /> Telephone(209)467-1006 FAX (209)467-1118 <br />