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rHE TFWIFM§ffu LASORATORIES . INC . ANALYTICAL CHEMISTRY - ENVIRONMENTAL SERVICES GEOTECHNICAL ENGINEERING DRILLING SERVICES CONSTRUCTION INSPECTION $ MATERIALS TESTING November 18, 1996 A68101.02E City of Stockton ENVIRONMENTAL HEALTH DIVISION 425 El Dorado Street 304 E. Weber Ave. Third Floor Stockton, California 95202 P. O. Box 388, to on CA 95201-0388 Approved Denied ❑ Attn: Mr. Robert Murdock Conditions Project: Van Buskirk Park Golf Course Date z 9G by 1740 Houston Avenue Stockton, California Subject: Work Plan Revision Dear Mr Murdock: The purpose of this letter is to revise the work plan (A68101.02C) dated February 23, 1996 for the referenced project. This revision is being made to improve the reliability of the planned soil sampling. The changes herein outlined were discussed with you during a telephone conversation with Mr. K. D. Jones of The Twining Laboratories, Inc. (Twining) on October 28, 1996. These changes were also discussed with and tentatively approved by Mr. Steve Sasson of the San Joaquin County Public Health Service (SJCPHS) on November 15, 1996. The following changes should be made to the aforementioned work plan: • Section 4.2.3 Soil Sampling Technique, change the entire section to read: " Subsurface soil samples will be collected using a hydraulically-powered, soil probing machine that uses static force and percussion to advance small diameter sampling tools into subsurface soil for collecting soil cores. A sampling tool (bore sampler) is attached to the leading end of a probe rod and driven into the subsurface using the machine. The sampling tool remains sealed by a piston tip as it is being driven. When the sampler has reached to within 24 inches of the desired sampling depth, an extension rod is lowered down through the inside diameter of the probe rods to the sampling tool. The extension rod is then used to disengage the stop-pin of the piston tip. The extension rod and stop-pin are then removed and the sampling tool is driven an additional 24 inches. The piston tip is displaced into the body of the sampling tool by the soil as the bore sample is cut. The sampler is the recovered from the bore hole and the bore sample (soil sample) is extracted from the sampler. The soil sample is contained within a sampler liner of clear plastic. The soil probe equipment will be decontaminated after completion of soil sample collection at each i CORPORATE OFFICE: MODESTO VISALIA BAKERSFIELD 2527 Fresno Street 4230 Kiernan Ave.Suite 105 2521 E.Valley Oaks Drive 3701 Pegasus Drive Fresno,CA 93716 Modesto,CA 95256 Visalia,CA 93292-6710 Bakersfield,CA 933 (209)268-7021 -Fax 268-7126 (209)545-1050•Fax 545-1147 (209)625.1712•Fax 625-1714 (805)393-5088•F