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4. In the December 1989 investigation, sample 35868 from boring B-5 had 12°m k of <br /> unknown hydrocarbons detected in the TPH:analysis. Ms. Maeys requested mg/kg of <br /> . <br /> type of hydrocarbons be assessed. -Due the low;i quantity-detected, the laboratory. <br /> could not quantify, this to any standard ( :e. .diesel fuel). This is explained in I <br /> Enseco's letter dated March 18.-.1991... Enseco l'as also provided in a letter dated f <br /> March,19, the chromatograph for the sample and""the.diesel gasoline and stoddard " <br /> standards. Both letters are'attached: <br /> 5:. In the December 1989 investigation,;sample 3586; from boring B-5 had 234 mg/kg <br /> of oil and grease' detected. - Ms: Maeys requested that the. portion of soluble <br /> comppounds be evaluated by the laboratory 1- possible.:• The analytical methods <br /> available.:for'the oil and d grease analysis, do not1,allow:assessment of the. pportion <br /> soluble in water. This asp explained., in Enseci�'s 'letter dated March 18'. 1991 <br /> (attached). . <br /> We hope that the enclosed"information is.helpful and will expedite_final closure of the <br /> former.UST. Please let us know if you have any questions or,need additional.information.' <br /> Sincerely, <br /> KLEINFELDER, INC. <br /> Alex M. Richards <br /> Staff Geologist _ <br /> 4etephen S. Boll, P.E. <br /> Senior Engineer <br /> AMR:SSB:mg <br /> cc: Craig Ogata,San Joaquin.County Department of Government Buildings <br /> F19-91-29 <br /> Copyright 1991 Kleinfelder, inc. ` <br /> KLEINFELDER 9795 Business Park Drive, Sacramento, CA 95827 (916) 366170.1 <br />