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Advanced <br /> GeoEnvironmental, Inc . - <br /> 15 January 2001 <br /> AGE-NC Project No. 95-0103 <br /> Mr. Harlin Knoll <br /> SAN JOAQUIN COUNTY <br /> Public Health Services - Environmental Health Division (PHS-EHD) <br /> 304 E. Webber Avenue, 3`d Floor <br /> Stockton, CA 95201 <br /> Subject: Work Plan Addendum <br /> CHAPIN BROTHERS, INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> Dear Mr. Knoll: <br /> At your verbal request of 08 January 2001 Advanced GeoEnvironmental, Inc. (AGE) has prepared <br /> this addendum to the 15 December 2000 work plan for ground water extraction feasibility testing <br /> at 1766 Monte Diablo Avenue, Stockton,California. The scope of work includes installation of three <br /> ground water elevation monitoring points, also called piezometers and the performance of two- <br /> phases of ground water extraction pilot tests. <br /> The Public Health Services - Environmental Health Division (PHS-EHD) has added the following <br /> conditions to the work plan prior to approval. <br /> • The installation of the piezometer will be conducted within a two-inch soil boring, <br /> established by first coring the soil boring, with a 2-inch GeoProbe Macro soil sampler. <br /> • Three soil probe borings will be established and sampled within the buildings on the site to <br /> assess the remaining mass of petroleum hydrocarbons south of the remediation network. An <br /> attached map of the site depicts the proposed soil probe boring locations. The sampling and <br /> analysis will follow the approved procedures outlined in Work Plan For Off-Site Assessment <br /> dated 10 May 1999, prepared by AGE and approved by your office on 12 May 1999. <br /> • The performance of a"step-drawdown" or multiple-step ground water extraction test. The <br /> multi-step tests will consist of ground water extraction rates 0.5 gallons pre minute (gpm), <br /> 1.0 gpm, 2.0 gpm and 4 gpm, the pumping rate during each step will be at least two-hours <br /> in duration and held constant. If the ground water level drops below the pump level or the <br /> lowest screen level of the well, then the test will be terminated and the acceptable ground <br /> water extraction rate will be the previous flow rate. Two constant rate tests, previously <br /> proposed,will be conducted for a full eight hours, at the optimum and sustainable pumping <br /> rate. <br /> 4005 North Wilson Way,Stockton,California 95205 <br /> Telephone(209)467-1006 FAX(209)467-1118 <br />