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t tg Collection. Soil from tubes not submitted for chemical anal s will be used to provide lithologic information. y is All soil samples submitted for chemical analysis will be labeled in the field with an indelible ink pen as they are collected. For each sample, the date and time of sample collection, the sampler's initials, the project name and the designated analyses will be recorded on the label and in the field log book. Soil samples will be identified b number-depth i s for example, a soil sample numbered well 5 woulind cate a soil f ° sample collected at monitor well ice]-1 from 5 feet below grade. 5.4 Soil ga_mule Analytical Protocol f € The soil samples submitted for chemical analysis will be trans- ported under chain-of-custody to the WESTON Analyticso Stockton, CA. laboratory. The analytical suite will include benzene, toluene, xylene isomers and ethylbenaene by EPA Method $pip (aromatic volatile organics) , total petroleum hydrocarbons by modifiedMetho i + Analytics, Stockton 15aboratoryEDB s a Californiaextraction certified WESTON for these anaylses, ora- 5.5 Water Sampling t,.. At the time of water sampling, the wells will first be for the existence of a floating product layer by the use of checked an ".• oil-water interface probe. If the probe indicates product is Fpresent, its thickness will be measured using the probe, and the t depth to product and depth to water will be k; recorded. Regardless Of the presence or absence Of visually detectable floating product, the total collected, petroleum hydrocarbons sample will then be The sample will be obtained using a clean, transpar- ent tef�on bailer lowered into well ament line until using new, clean monofill- will be retrieved the bailer is partially submerged. The bailer and inspected for visual confirmation oil-water of the f ` ( ; probe results and its contents will be poured in appropriate sample container. to the It may be necessary to lower the bailer more than once in order to obtain enough water to satisfy � j the analytical method requirements. Once the total petroleum hydrocarbons sample has been collected, the total well depth will be verified. In conjunction with the i depth to water measurement, the volume of standing water in the «° well and the required g purge volume will be calculated and record-- ed on a standardized well sampling log sheet. It is proposed to i ' purge three standing well casing volumes with a 3 inch submers- ible pump prior to collection of the water samples. The pump use with a high pressure Will be thoroughly cleaned prior to i Potable water spray rinse, and will be cleaned after each well is purged in the same fashion. In the last moments of well purging, the pH, temperature, and conductivity of the water will be measured and recorded. A record of the purging activities, tet