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California Agional Water Quality Pontrol Board Central Valley Region Winston A.Hickox Robert Schneider,Chair SE// Secretaryjar Gray Davis Environmental Sacramento Main Office Governor Protection Internet Address: http://www.sweb.ca.gov/r qg b5 3443 Routier Road,Suite A,Sacramento,California 95827-3003 24 April 2002 Phone(916)255-3000•FAX(916)255-3015 Mr.Dale Gillespie Geweke Land Development and Marketing PO Box 1210 Lodi, CA 95241 REVIEW CONE PENETROMETER TESTING REPORT, GEWEKE PROPERTY, 16 SOUTH CHEROKEE LANE,LODI,SANJOAQUIN COUNTY, CLEANUP AND ABATEMENT ORDER(C&A)NO. 93-701 Board staff reviewed the 19 February 2002 Cone Penetrometer Testing Report-December 2001 (CPT Report) submitted by Advanced GeoEnvironmental, Incorporated(AGE)on behalf of Geweke Land Development and Marketing(Geweke). The CPT Report presents the results of completing three cone penetrometer testing(CPT) borings, and collecting nine groundwater grab samples to define the lateral and vertical extent of groundwater contamination relating to the former underground storage tanks at the Geweke site. For the reasons presented below, we find that the CPT Report is incomplete. Please provide an addendum to the CPT report to respond to the following staff comments: 1. On 19 December 2001, the San Joaquin County Environmental Health Department(County)inspector reported that strong hydrocarbon odor was identified from soils in CPT-2 when the drilling contractor was completing utility clearance with a hand auger. The CPT Report did not provide any acknowledgement of encountering contaminated soils. Previous site work identified soil contamination starting at 15 feet in this area, and all shallow soil contamination must be properly characterized. Please provide a discussion of the soil contamination encountered at CPT-2 in the CPT Report Addendum including any soil samples collected for analysis, or any photo ionization detector readings measured. 2. Total petroleum hydrocarbons as gasoline(TPHg)were identified in eight of the nine groundwater grab samples ranging in concentration from 60 micrograms per liter(µg/1)to 500 µg/1, and ranging in depth from 72 to 134 feet. A discussion of this TPHg contamination with depth was not presented, and a proposal to verify the groundwater contamination identified during the CPT investigation or to install deeper monitoring wells was not included with the CPT Report. With this work.the vertical extent of groundwater contamination remains undefined Please provide a discussion of the groundwater contamination identified during this CPT investigation(for example,how does the contamination identified fit into the conceptual model for this site), and provide a proposal to verify groundwater contamination identified during the CPT investigation. 3. Extensive subsurface investigation work has been completed at this site,yet geologic cross-section A-A' provided in the CPT Report only included data for three monitoring wells(MW-5, MW-14, and MW-4) California Environmental Protection Agency 0 Recycled Paper The energy challenge facing California is real. Every Californian 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.sweb.ca.gov/mqcb5