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CONDOR EARTH y 188 Frank West Circle,Suite I 7 Stockton,CA 95206 209.234.0518 Fax 209.234.0538 CONDORwww.condorewh.com December 18,2019 RECEIVED Mr.Roy Reeves JAN 0 8 2020 Reeves Sand&Gravel,Inc. PO Box 60 ENVIRONMENTAL HEALTH French Camp,CA 95231 PERMIT/SERVICES Re: Pesticide Screening, APN 131-060-01, 10450 W. McDonald Road, Stockton, San Joaquin County,California,Condor Project No.8171 nA- _ Dear Mr. Reeves: f Condor Earth (Condor) prepared this report of findings for Assessor's Parcel Number(APN) 131-060-01 located at 10450 W. McDonald Road, Stockton, San Joaquin County, California. The subject property comprises approximately 313.79 acres of agricultural land. Condor understands that in order to permit excavation of sand deposits on the property,San Joaquin County requires an evaluation of soil on the project that includes the crops, pesticides, and management practices of the land prepared by a registered professional. Condor also understands that the project area comprises approximately 57.7 acres south of McDonald Road and west of the eastern property boundary(Site).The sand deposit proposed to be quarried is an old river channel that is approximately 9.1 acres at the surface. The remaining 48.6 acres of land surface is intended to be used to backfill the excavated sand deposit during reclamation.This report includes a discussion of the agricultural history of the Site, description of field activities, laboratory analyses, and conclusions. The purpose of the work described herein is to confirm concentrations of residual and persistent agricultural chemicals typically associated with historic land use practices of agricultural operations. Constituents of concern for use of property as agricultural fields from the early 20`'' century until the 1970s include those that persist in soil:organochlorine pesticides(OCPs), lead,and arsenic. Until the 1950s, lead-arsenates were used for pest control. After the 1940s, OCPs were in widespread use until most of these compounds were banned by the EPA in the 1970s and the remaining ones in the 1980s. SITE HISTORY Based on review of historic aerial photographs publicly available from San Joaquin County, the Site was used for agricultural purposes from at least 1937 until present,and no structures appear to have been located on the Site.Past crops appear to have been primarily feed crops(hay and alfalfa)and possibly corn prior to the 1980s. Recently,the Site was planted with grapes last harvested in 2016,and the land has been fallow since. The last agricultural chemicals applied to the Site were Prowl H2O, Galigan 2E, and dusting sulfur. According to EPA documentation', the first two trade-names are herbicides designed to control unwanted weed growth and do not persist beyond one week after application. Dusting sulfur is a pesticide used to control powdery mildew and rust in grape cultivation and is applied at a rate of 10-40 pounds per acre every two weeks during new growth.This pesticide(native sulfur)is not known to persist in the environment and https://www3.epa.gov/pesticides/chem search/ppls/000241-00418-20150129 pdf httr)s://www3.epa.gov/pesticides/chem search/ppis/066222-00028-20141024 pdf https://www3.epa.gov/pesticides/chem search/12ills/002935-00048-20101210 pdf ILO CONDOR