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Soil-Gas Investigation Workplan July 6, 2015 200 N Beckman Rd Page 5 laboratory the document information will also include the name of the person receiving the samples, laboratory sample number (if different from the field number), and date, time and condition of sample upon receipt. LABORATORY QUALITY ASSURANCE/QUALITY CONTROL All laboratory analyses will be performed at a laboratory certified by the State of California Department of Health Services to perform the requested services. The purpose of a quality assurance/quality control program is to follow standard field sampling and laboratory handling procedures that will allow the generated data to be scientifically valid, defensible, and of appropriate quality. The laboratory has documented procedures for handling, preparing, and testing samples for the various types of compounds for which that laboratory is certified to test. Copies of these procedures are available at the laboratory and will provided upon request. Laboratory reports will be reviewed to check that analyses are completed within the recommended sample holding times and that proper sample preservation, preparation, and extraction techniques have been used. Measurements of percent recovery for spiked samples will be evaluated for compliance with established laboratory control limits. Data identified as being of sufficient quality will be used; suspected data will be identified as such. After completion of sampling activities, the borings will be backfilled to surface grade with neat cement grout composed of one sack of Portland Type I/II cement (94 lbs.) to approximately five gallons of potable water provided by the driller. Drilling and sampling equipment will be steam cleaned or thoroughly scrubbed with alconox solution followed by a distilled water rinse prior to being brought on site and between samplings. Grouting will be supervised by the San Joaquin County's Inspector. Environmental and Remediation Services since 1992!