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' BLAINE TECH SERVICES, INC SANJ05E SACRAMENTO LOS ANGELES SAN DIEGO <br /> Immediately recharge Wells that dewater will be sampled (see Section 9) once they have <br /> recharged to 80% of their original static water level or when we are prepared to leave the site <br />' provided at least one hour has passed <br /> All calculations, quantities of water removed, parameter measurements and relevant times <br />' associated with the purging process are contemporaneously recorded on the ARCO/BP Well <br /> Monitoring Data sheet <br />' 7. NO-PURGE METHODOLOGY <br /> Wells that qualify for No-Purge sampling are sampled without purging and are sampled using <br />' the protocols described below for Sample Collection <br />' 8. COLLECTION OF DISSOLVED OXYGEN (DO) MEASUREMENTS <br /> At ARCO Heritage sites, a DO measurement Is collected at all sampled wells Immediately at the <br /> end of purging (if applicable) and prior to sampling The measurement Is collected using an <br /> electronic meter (YSI Model 51 , 58, 95 or equivalent) Water Is drawn from the well using a <br /> disposable bailer, placed in a clean cup with the meter probe and the measurement collected <br />' The meter Is calibrated between wells as per the manufacturers specifications <br /> If requested, DO measurements are collected at BP Heritage sites prior to and/or at the <br /> completion of purging using down-hole collection methodology The probe of the meter <br />'0 <br /> described above is lowered into the well and suspended Just below the water column The <br /> measurement Is collected once stabilized <br />' All DO measurements are contemporaneously recorded on the ARCO/BP Well Monitoring Data <br /> sheet <br />' 9 SAMPLE COLLECTION <br />' COLLECTION <br /> All samples are collected using disposable bailers The bailer Is gently lowered Into the well to <br /> minimize agitation or aeration of the water The bailer Is filled and emptied prior to filling sample <br />' containers If Dissolved Oxygen measurements were collected at the well after purging, the <br /> same bailer may be reused for sample collection New Nitrile gloves are donned immediately <br /> prior to sampling Bailers and their associated cord are used once and then discarded <br />' PARAMETERS <br /> One set of groundwater parameter measurements (electrical conductivity, pH, and temperature) <br /> Is collected at time of sample <br />' CONTAINERS <br /> Sample material Is decanted directly from the bailer Into sample containers provided by the <br />' laboratory that will analyze the samples The transfer of sample material from the bailer to the <br /> tSTANDARD OPERATING PROCEDURES—BP/ARCO NORTHERN CALIFORNIA Page 5 <br />