ARCHIVED REPORTS_XR0009751 - Laserfiche WebLink

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1 0 INTRODUCTION • Crisp Construction has authorized AquaGeosciences, Inc to prepare this workplan for site charactenzation at Thiemann's Service located at 106 West Second Street, Ripon, California The San Joaquin County Environmental Health Department (County) is the lead regulatory agency 11 PURPOSE The site characterization described in this workplan has the following objectives * Further assess the lateral and vertical extent of on-site vadose zone contamination involving gasoline and volatile aromatics, benzene, toluene, ethyl benzene, and xylenes (BTEX); 1 2 SCOPE OF WORK The scope of services described in the Workplan include Locating underground utilities using Thiemann Services as-built drawings (if available) as well as Underground Service Alert (U S A ), Advancing up to six (6) soil borings in the vicinity of the former underground gasoline storage tanks, * The six (6) bonngs will be advanced to depths of 50 feet, ten feet of unimpacted soil, auger refusal, or encountering groundwater, * Steam cleaning of all drilling and sampling equipment prior to and between each boring to avoid cross-contamination, * Collecting soil samples at depths to be evaluated in the field Initially, samples will be collected at approximately five foot intervals beginning at five feet and continuing until total depth The samples will be collected using a standard California split-spoon sampler equipped with brass tubes, steam cleaned prior to use These samples will be field screened and selected samples will be chosen for chemical analyses, * Field Screening will be accomplished using a photo-ionizing detector (PID) equipped with a 10 OeV lamp ora flame-ionizing detector (FID) Soil samples will be placed in mason bars to approximately 50% capacity, shaken, and let stand for approximately 15 minutes A standard headspace reading will be collected at this time, 2 of 12