Laserfiche WebLink
San Joaquin County PHS/Elio <br /> 651 South Tracy Blvd. - PAR <br /> r^� <br /> April 10, 1990 <br /> r Page 4 <br /> 72 hours will be ellowod to elapse between completion of <br /> development and sample collection. <br /> Prior to the collection of ground water samples the depth to <br /> water in each well will be measured and recorded for use in <br /> determining the local ground water gradient. Each well will <br /> then be purged. Normal purging will consist of the removal of <br /> between three to Five casing volumes of water. In the event <br /> of slow recovery, the well will be completely evacuated of one <br /> l casing volume and the sample taken after recovery, Both <br /> purging and sampling will be performed using a Teflon bailer <br /> cleaned between wells with laboratory-grade detergent and <br /> triple rinsed with distilled water. <br /> Ground water samples will be taken from each well, placed in i <br /> appropriate sample bottles, properly labeled, and placed in an <br /> iced cooler for transport to a state certified laboratory. i <br /> Chain-of-custody protocol will be maintained and all ground f <br /> water samples retained for chemical analysis. <br /> � z <br /> IV. Laboratory Analysis and Sampling Intervals: t <br /> All soil and ground water samples will be analyzed for the <br /> following parameters: Total Petroleum Hydrocarbons as <br /> gasoline and diesel (modified EPA method 8015) and BTX&E (EPA w� <br /> method 602) . All analysis will be carried out by a State of <br /> California certified laboratory. <br /> All wells will be initially sampled as soon as possible afte <br /> installation and.development. Ya � sl ` <br /> The <br /> sampling schedule will cease, :at that time, if it has been <br /> /determined that levels of contamination are below the State <br /> 5/ Action Levels. If, after-this twelve month. period, the levels <br /> of contamination do not drop below the State's Action Levels, <br /> sampling will continue until it can be shown, for two <br /> consecutive quarters, that levels have dropped below .these <br /> &�' action levels. <br /> , s <br /> V. Reporting: //� <br /> i. A comprehensive reportrwill be prepared after receipt of the <br /> --------- --initial---analysis-results.----This---report--will-present-narrative..-..-.. ?--_._-.-- -- <br /> summary plus all well construction details; boring logs, <br /> alytical <br /> development records, groundwater gradient maps, an <br /> rb <br /> �� 1 <br />