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K L E I N F E L D E R 3 BACKGROUND Granite Construction Company operates a construction yard at 10500 South Harlan Road in French ' Camp, California The construction company Includes a fuel storage and a working yard area The yard area Includes a batch plant which produces asphalt products Kleilfeldei reviewed a Wallace Kuhl & Associates Inc ,(WKA) report on the subject site titled "Report of Findings, Granite Construction French Camp, 10500 South Harlan Road, French Camp, Caliioinia WKA No 2088 04 , dated December 2, 1993 This report included site history and findings In the vicinity of five former undergiound storage tanks (USTs) Based on Plate 2 of WKA s report, Kleinfeldel undei stands the f6imer UST area discussed in this repoit is located south of the fuel storage at ea (See Plate 2) Two of the USTs reportedly contained diesel, 2 contained gas and I contained waste oil The tanks were reportedly removed on April 22, 1992, at which time soil samples wete collected beneath the tanks Diesel and gasoline affected ' soils were found beneath the tanks, par ticular ly at depths fiom 15 to 25 feet bgs Approximately 17 soil borings and thice monitoring wells were advanced and installed, respectively in the vicinity of the tank cluster The estimated contamination area was estimated to be 9, 500 square feet Approximately 700 yds' of diesel and gasoline affected soil was removed on September 28, 1993 in the vicinity of a dispenser island Further soil and groundwater assessment was conducted in the vicinity of the former USTs WKA installed three additional monitoring wells (MW-4 ' through MW-C) to lurther delineate the soil and groundwater contamination at the site Based on boring logs, gioundwatet was encountered between 29 to 31 feet bgs WKA concluded that soil and water contamination did not extend to these wells which are situated north and northeasterly of the former USTs Additional excavation on soils in the vicinity of a dispenser island was not recommended Repottedly the e\c,avation vas backfilled with clean fill by Granite Construction The former diesel and gasoline UST c.\cavations weie lined with plastic and backfilled also 3 1. BACKGROUND ON THIS AREA OF CONCERN The Granite Construction facility rncotpoi ates the use of liquid asphalt cutback and emulsion which has been stored onsite in two 12 000 4-allon underground storage tanks discussed in the text of this report Klemfeldei undeistands that currently the liquid asphalt emulsion is imported and not longer stored at the site rhe LLItbac.k and emulsion liquids consist of a mixture of petroleum hydrocarbons and distillates Specifically the cutback liquid is called "SC Cutback Asphalt, SC- 250" and the cnntlsion is called Asphalt Emulsion, SS-IH" Both products are manufactured by Huntway Refining Company of Wilmington California ' In accordance with the requests liom the San Ioaquin County Public Health Services Department, Environmental Health Division (PI-ISIE HD) to the Granite Construction Co , Kleinfelder conducted ' 20-1108-24 1-01/2019R 120 Page 5 M 16 0 1999, Kluntd&r InL h�biumN 5, 1999