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January 31,2023 <br /> SITE INVESTIGATION WORK PLAN <br /> FORMER D&D FLYING SERVICE <br /> 600 NORTH HOLT ROAD <br /> STOCKTON,CALIFORNIA <br /> PROJECT NO: 06304-01 <br /> (SITE ID: SLT5S053744) <br /> 1.0 INTRODUCTION <br /> The subject property located at 600 N Holt Road in Stockton (Site) was previously operated the <br /> D&D Flying Service (D&D). Between 1981 - 1988, D&D washed the exterior of agricultural aircrafts <br /> used for pesticide applications on the northeastern portion of a dirt airstrip, which was on the <br /> north portion of the subject property. Pesticide containing rinse water from the washed planes was <br /> reportedly drained directly onto the soil while D&D was in operation. The subject property is listed <br /> as an "Open - Inactive" case with the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) as of January 2, 19851. Although the D&D Flying Service company has since dissolved, <br /> the case is open and an investigation to determine potential impacts to soil and groundwater to <br /> evaluate pesticide impacts has been requested through the CVRWQCB Site Cleanup Program. <br /> Petralogix Engineering, Inc. (Petralogix), on behalf of 140 Orchard, has prepared this Former D&D <br /> Flying Service Site Investigation Work Plan to assess current concentrations of pesticides in soil and <br /> groundwater where the agricultural planes were washed. <br /> 1.1 Scope <br /> The scope of work for this site investigation is: <br /> • Drill and sample four (4) hollow-stem auger soil boring locations,each location advanced to <br /> a depth of 1.5 feet below ground surface (bgs) in the location of the former plane rinse area, <br /> including adjacent to the canal. <br /> • Drill and sample one (1) hollow-stem auger boring to groundwater, estimated at <br /> approximately 10 feet below ground surface; the groundwater boring location will be co- <br /> located with the soil boring location (131) in the former plane rinse area. <br /> • Borings will be logged by a California Professional Geologist <br /> • Soil and groundwater samples will be collected, preserved, transported, and analyzed in <br /> accordance with California DTSC site assessment guidance. <br /> • Submit soil and groundwater samples to California ELAP-accredited laboratory for analysis <br /> of organochlorine pesticides. <br /> • Prepare a site assessment report including a map of borings,boring logs,laboratory results, <br /> findings,and human health risk assessment for unrestricted use. <br /> https://aeotracker.waterboards.ca.gov/profile_report?global_id=SLT5S5053744 <br /> Petralogix Engineering,Inc. <br /> 26675 Bruella Road,Galt,Ca 95632 <br /> _j <br /> (209)-400-5729 <br /> www.petralogix.com <br />