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California Regio nal Water Quality Control Board \% Central Valley Region Robert Schneider,Chair CD Davis Winston H.Hickox N Gray_6- nor - ' Secretaryjar Sacramento Main Office v ?�eraor Environmental hitemet Address: http://www.swrcb.ca.gov/mgcb5 Z - Protection 3443 Routier Road,Suite A,Sacramento,Califomia 95827-3003 N Phone(916)255-3000•FAX(916)255-3015 r 1. 23 January 2002 N n ' r^n N — Mr. Jim Fisk J&L Market 8125 South El Dorado Street French Camp,CA 95231 PRELIMINARYINVESTIGATION AND EFAL VATION REPORT REVIEW 8125 SOUTH EL DORADO STREET, FRENCH CAMP,SAN JOA QUIN COUNTY Staff reviewed the 31 December 2001 Preliminary Investigation and Evaluation Report(PIER) submitted on your behalf by Upgradient Environmental Consultants for the J&L Market site. The PIER presents the results of soil and groundwater sampling at two on-site soil borings completed on 12 November 2001 following the excavation of approximately 4,000 cubic yards of impacted soils in November 1995. Analytical results from the eight soil samples and the two water samples collected and analyzed show soil contamination at one boring from 10 to 25 feet, and groundwater contamination at both borings. The depth to first water was encountered at 30 to 35 feet below ground surface. Maximum groundwater contamination identified from the two groundwater grab samples show 2,300 micrograms per liter(µg/l)total petroleum hydrocarbons as gasoline (TPHg),21 µg/1 benzene, 120 µg/1 MtBE, and 25 µg/1 1,2-dichloroethane. Based on these concentrations, a groundwater investigation is required. The PIER did not include recommendations to identify the nature and extent of contamination found,nor did it include well construction details for the on-site domestic well. Therefore,by 25 February 2002, submit a plan of work to define the lateral and vertical extent of soil and groundwater contamination. The plan of work must address the following items: • Install a minimum of three shallow monitoring wells to determine the groundwater flow direction and gradient. The monitoring well screen interval should not exceed 20 feet in length for water table monitoring wells(15 feet below first water,and five feet above). Additional monitoring wells are likely to be required after the groundwater flow direction is determined. • Define the vertical extent of groundwater contamination by completing soil borings or cone penetrometer testing(CPT)borings, and sampling groundwater in preferential pathways. • Complete a well receptor survey within 2,000 feet of the site. Provide a map of identified receptors (including the inoperative on-site domestic well),and provide well details and distances from the subject site in a table. Propose to sample threatened wells. California Environmental Protection Agency 0 Recycled Paper The energy challenge facing Califomia is real. Every Califomian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/mgcb5