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KLEINFELDER <br /> 1 EXECUTIVE SLTNEVIARY <br /> This is a report of Kleinfelder's soil and groundwater assessment conducted at the West Clay <br /> Properties Commercial site located at 639 West Clay Street, in Stockton, California (see Plate <br /> 1) Mr Dan Silva of West Clay Properties retained Klennfclder to conduct the assessment in <br /> accordance with our proposal dated March 16, 1994 However, the San Joaquin County <br /> Environmental Health Department required additional samples be obtained for chemical <br /> analysis and additional compounds be analyzed for at additional costs to the client <br /> Kleinfelder collected a total of twelve (12) soil samples from four soil borings Additionally, <br /> three (3) groundwater samples were obtained from monitoring wells installed within 3 of the 4 <br /> borings <br /> Petroleum hydrocarbons were detected in all twelve (12) of the soul samples analyzed <br /> However, only trace concentrations were present in the samples analyzed from the boring <br /> associated with monitoring well MW-3 (aka boring B4) The hydrocarbons noted in all of <br /> the soil samples analyzed can be generalized as primarily volatiles in the gasoline range with a <br /> high percentage of benzene, toluene, ethylbenzene, and xylenes (BTEX) Only minor <br /> concentrations of the heavier hydrocarbons (greater than C16 range) were present The <br /> compounds and concentrations present are indicative of a gasoline <br /> Because all of the water samples had detectable hydrocarbon concentrations above regulatory <br /> action guidelines, the lateral extent of TPH migration in the groundwater cannot be estimated <br /> Furthermore,Kleinfelder recommends the following <br /> 1 Further assessment should be conducted of the extent of gasoline range <br /> hydrocarbons in the soil and groundwater beneath the site <br /> 2 The existing soil cuttings should be incorporated with the hydrocarbon-affected soil <br /> stockpiled at the back of the property for later disposal <br /> 3 The equipment rinseate and development/purgewater should be properly disposed <br /> of by the Client Kleinfelder can assist the Client in that disposal at the Client's <br /> request <br /> A copy of this report should be submitted to the San Joaquin County Environmental Health <br /> Department for their review and consideration This report is subject to the limitations found in <br /> 1 Chapter 7 <br /> ErH and WC194 <br /> Copyrtght 1994 Kleinfelder,Inc Page 2 of 11 <br />