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•"'{P%=I 4`3 f Qh LIC I.. VL iiu ilJ-4� r u i 2-02-1996 10:2_::,t t Fi.OH THE L 9 4 R A T O R I E S . I 11TWINING ANALYTICAL CHEMISTRY • ENVIRONMENTAL SERVt-ES GEOTECHNICAL ENGINKERING DRILONO SERVICE$. CGNgTRtlC'rIDrI flu4orRCTIOn d MATERIALS TE3'tt-ty ' �Yovernber 13.. 1996 A68141.02E City of Stock.-ton ENVIRONMENTAL HEALTI Fi DIVISION 425 El Dorado Street 304 E.Weber Ave.Third Floor P 0. Box 388, to On CA 95201-0388 Stockton, California 95202 Approved Denied ❑ Attn: Mr. Robert Murdock Condlbons Project: Van Buskirk Park Golf Course Date x qG by_ `-`)• ;n�� 1740 Houston Avenue r Stockton, California �t Subject: Wort: Flan Revision Dear ,\1r hS!.;rdock: The purposc 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 T%vining Laboratories, Inc. (Twining) on October 28, 1996. Thcse changes were also discussed with and tentatively approved by Mr. Steve Sasson of the San Joaquin County Public Health Service (SJCPHS) on November 15, 1995. The following g changes should be made to the aforementioned work plant: • Section 4.2.3 iI SamplijIg Techgj= change the entire section to read: " Subsurface soil samples will be collected using a hydraulically-powered, soil probing machi:ze 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 scaled by a piston tip as it is being driven. When the sampler has reached to within 24 inches of the desired sampling deptb, an extension rod is lowered down through the iwide 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 displaccd into the body of the sampling tool by the soil as the bore sample is cut. Tine sampler is the recovered from the bore hole and the bore sample (soil sample) is extracted from the sampler. 'Ile 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 CORPORATE OFFICE: MODESTO YISXIA RAKERSFIELO 212'Frvae street 4230 KieMar,Ave.W161,06 2521 E.valley rjus orive 370! Pegasus mve.swie .2s