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PARSONS ENGINEERING SCIENCE, INC. - <br /> 290 Elwood Davis Road, Suite 312•Liverpool,New York 13088•(315)451-9560•Fax(315)451-9570• <br /> May 6, 1997 <br /> Mr. James Brathoude <br /> Regional Water Quality Control Board <br /> 3343 Routier <br /> Suite A <br /> Sacramento, California 95827-3098 <br /> Re: Greyhound Lines, Inc. Terminal <br /> Location #8969 <br /> Stockton, California <br /> Dear Mr. Brathoude: <br /> Please find enclosed: (1) analytical results from two groundwater samples recently <br /> collected at the Greyhound Lines, Inc. Stockton, California terminal (Attachment A), and (2) <br /> estimates of the mass of benzene, toluene, ethylbenzene, and xylene (BTEX), and total diesel <br /> petroleum hydrocarbons (TPH-D) remaining in onsite soil (Attachment B). These items are <br /> intended to complete the site closure package submitted in December 1996, as discussed during <br /> our December 1996 conversation. <br /> The groundwater samples were collected from monitoring wells MW-2 and MW-3 on <br /> March 6, 1997 in order to assess the previously submitted results from groundwater samples <br /> collected on December 11, 1996. The March 1997 samples were analyzed for TPH-D <br /> (Modified EPA Method 8015) and BTEX (EPA Method 8020). The results were consistent <br /> with results from most of the samples collected prior to December 11, 1996; BTEX and TPH- <br /> D were not detected in either sample. <br /> The estimates of the mass of BTEX and TPH-D remaining in onsite soil are based on the <br /> results from soil samples collected onsite. These results are summarized in the December <br /> 1996 Request for Closure Report. Assuming a volume of 11,000 cubic yards of contaminated <br /> soil remain onsite (page 9, Request for Closure Report) and a conservative soil porosity value <br /> (30 percent), we estimate the remaining mass of BTEX is 0.1 kg and the remaining mass of <br /> TPH-D is approximately 128 kg. <br /> If you have questions or require any additional information, please call us at <br /> (315) 451-9560. <br /> Sincerely, <br /> PARSONS ENGINEERING SCIENCE, INC. <br /> Christopher R. Torell <br /> Project Manager <br /> David L. haffin, R.G. <br /> California Registered Geologist <br /> (No. 4885) <br /> cc: Leroy Hernandez, GLI, Dallas, TX <br /> Michael J. Infurna, San Joaquin County PHS-EHD <br /> 0R:\WP\730844\89691\89691 L02.DOC <br /> PARSONS <br />