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SMTH <br /> ENVIRON MENTAL TECHNOLOGIES CORPORATION — <br /> , al; <br /> May 3, 1996 <br /> 95-122-01-01 <br /> Mr. Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject: Addendum to the "Workplan for Additional Subsurface Investigation", Fayette <br /> Manufacturing Site, 7675 West Eleventh Street, Tracy, California <br /> Site Code: 2233 <br /> Mr. Rowe: <br /> Smith Environmental Technologies Corporation, on behalf of Dr. A.R. Glover, is submitting this <br /> addendum to the "Workplan for Additional Subsurface Investigation" in response to your <br /> comments dated March 18, 1996 regarding the workplan for the subject site. The purpose of the <br /> additional subsurface investigation is to delineate the horizontal and vertical extent of petroleum <br /> hydrocarbon contamination present in the soil and groundwater on-site in the vicinity of and <br /> downgradient from the locations of the former gasoline underground storage tanks (USTs). In <br /> addition, the investigation is to provide soil data for determining remediation alternatives, <br /> specifically natural attenuation. Per Dr. Glover's request, this addendum also includes the scope <br /> of work for disposal and/or treatment of groundwater and soil currently stored on-site and also, <br /> for one year of quarterly groundwater monitoring, sampling and report preparation. <br /> Subsurface Investieation <br /> Six borings will be advanced to depths of approximately 15 feet by Direct Push Technology <br /> (DPT). Drilling will be conducted by a State-licensed (C57) drilling company. Additional borings <br /> may be required depending upon field conditions during drilling to complete delineation of the soil <br /> and groundwater contamination. A field geologist will be present to log all drill cuttings and soil <br /> samples. Descriptions of soil types encountered and sample collection intervals will be recorded <br /> on boring logs. Soil samples will be collected at a minimum of five foot intervals and field <br /> screened with a photo ionization detector (PID) for volatile organic compounds (VOCs). In <br /> addition soil gas samples will be collected and field screened for VOCs with a PID and for <br /> C�^eccPn* using an oxygen meter on a lower explosive limit meter (LEL). A temporary <br /> casing will be set in the open borings to allow for the collection of a groundwater sample. One <br /> soil and one groundwater sample from each boring will be submitted for laboratory analysis of <br /> total petroleum hydrocarbons as gasoline (TPHg); benzene, toluene, ethyl benzene, and xylenes <br /> (BTEX); and methyl tertiary butyl ether (MTBE). In addition, selected soil samples from <br /> 95113V.E=RS\Ladden.doc 1 <br /> 1260 Graphics Drive - Modesto,CA 95351-1502 - (209)579-2221 - Fax(209)579-2225 <br /> Engineering - Consulting - Remediation - Construction <br />