The version available for purchase has charts for the arch shaping and foot. It suggests additional yarns as well. It also has a better explanation about the placement of the stitch markers.

The version from Knitty (Winter 2009) is available here.

From the description:

Winter temperatures in California are on the cool side and the landscape is at its greenest. Wearing socks provides just the extra bit of warmth needed to stay comfortable.

This socks mixes it up with an unusual rib, lace and a shaped arch. The faux cable and lace pattern captures the nature of the volcanic mountains that form the interior landscape between Northern California and Southern Oregon. The ribbing flows effortlessly into the pattern that makes up the leg of the sock and reminds me of flowing lava.

The foot features a shaped arch, which was inspired by reading about Elizabeth Zimmermann’s shaped arch knee socks. The arch shaping biases the fabric in the foot, providing a very snug fit that does not shift around in your shoe.

FINISHED MEASUREMENTS
Circumference: 7 8.25 inches unstretched
Foot length: Adjustable to fit

ERRATA: (Written instruction is incorrect.) Rnd 5 of the lace repeat should be P2, k2, YO, k3, SSK, k2, rep to end of round.

Round 1 of the Gusset and Arch Shaping should be Pick up and knit 16 19 sts along right edge of heel flap; pm (this will be known as marker 3); work in established pattern over 33 39 sts of instep; pm (this will be known as marker 4); pick up and knit 16 19 sts along left edge of heel flap; k3 5, pm (this will be known as marker 5), k6, pm--this marks the beginning of the round and is marker 1. 83 99 sts total. (added 01/11/10)

Round 6 of the Gusset and Arch Shaping should be K2, m1, k to marker 2, slip marker, SSK, k to 3 sts before marker 3, k2tog, k1, slip marker, work in established pattern to marker 4, k1, SSK, k to 2 sts before marker 5, k2tog, slip marker, k to 2 sts before end of round, m1, k2. 2 sts decreases, 77 93 sts.